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SP 2000-048 Palmilla (2000) Technical Appendicesf£FifF #jryy.� S 33i _ a TECHNICAL APPENDICES MDs Consulting - Hydrology & stormwater Retention study LSA Associates, Inc. - Archaeological Assessment - Paleontological Resource Assessment Ogden Environmental and Energy services - Biological Assessment x'09 HYDROLOGY & STORMWATER RETENTION REPORT TENTATIVE TRACT NO. 29858 CITY OF LA QUINTA HYDROLOGY STORMWATER RETENTION STUDY JUNE 28, 2000 PREPARED FOR: RJT HOMES 50-842 GRAND TRAVERSE LA QUINTA, CA 92253 PREPARED BY: ■ o 1 77.7M Or Axe. if .oiiex V.6- 7Lam4013 • Icx.L.= riw 760.7n4m PLANNERS ENOI NIERS SURVEYORS F. Hydrology & Stormwater Retention Study June 28, 2000 Table of Contents Executive Summary Introduction Purpose of the Study Project Location Goals Existing Conditions Existing Land Use Project Topography Existing Hydrology Proposed Conditions Proposed Land Use Proposed Topography Proposed Drainage Facilities Developed Hydrology Appendix Undeveloped Hydrology Calculations Developed Hydrology Calculations RJT Homes TTM 29858 HvdroloL,v & Stormwater Retention Study June 28, 2000 EXECUTIVE SUMMARY Tentative Tract No. 29858 is a 72 -acre parcel of agricultural land at the southwest corner of 50thAvenue and Jefferson Street in the City of La Quinta. The project is planned as a residential project and will require onsite retention of stormwaters ipursuant to City drainage policy. The proposed stormwater management plan intercepts the stormwater at encatchment points throughout the project as well as in the ornamental lake system and conveys the stormwaters to a 3 -acre retention basin at the southeast corner of the project. RJT Homes TTM 29858 I ,! Hydrology & Stormwater Retention Study June 28, 2000 INTRODUCTION Purpose The purpose of this study is to provide a conceptual -level Hydrologic and Stormwater Retention Study to accompany the environmental documents for the General Plan Amendment, Zone Change, Specific Plan and Tentative Tract Map for the project. Protect Location The project site is located at the southwest corner of the intersection of 5011, Avenue and Jefferson Street in the City of La Quinta. The Citrus Course bounds the project on the south, with another residential project adjacent on the west. 5011, Avenue and Jefferson Street form the other boundaries of the project. (See Vicinity Map) Goals The goals of this Hydrologic and Stormwater Retention Study and to evaluate existing and proposed hydrology and drainage patterns of the project site and to develop a stormwater retention concept for the developed project that retains the project's stormwaters onsite. RJT Homes TTM 29858 �4 Hydrology & Stonnwater Retention Study June 28, 2000 Vicinity Map 1. Source. Thomas Bros. Maps RJT Homes TTM 29858 Hydrology & Stornlwater Retention Study June 28, 2000 EXISTING CONDITIONS Existing Land Use TT 29858 is an agriculture parcel of approximately 72 acres that contains one residential structure on the westerly portion of the land. (See Existing Land Use) Project Topog=rapphy The topography for TT 29858 consists of a higher bench adjacent the westerly boundary (elevation 49 approximately) that drops off sharply to elevation 36 and then trends gently to elevation 32 at the southeast corner. There are mounds (old potential home sites) and sumps within the project. Existing Hydrology The existing hydrology for TT 29858 consists of two main drainage areas: 1) The series of internal sump areas that collect and retain stormwaters 2) The northeast and easterly portions that, in substantial storm events, would pass stormwaters through the project to Jefferson Street. For the internal sump areas, approximately 51.4 acres retain stormwaters onsite in various sumps. The remaining drainage area (approximately 25.5 acres) would drain slowly through the project exiting onto Jefferson Street. (See Existing Hydrology) RJT Homes TTM 29858 5DTH AVEME 4* - Wt .77'. v 01 J." rr rt" d. Q� V' et A v f Z rjz- or Z' tE )y I ;F1 js. •Ir It rf W 'A W. 2�T .4t. W 9j- I k3 zr L it iQ it AW —1�1 dl, If . + 'fly, 4. nQ tit 41 4 �r .- /'� — —, 1j; I - r I 13 . r t4, 4 ip, -fCV�TL vtr( m 0 100 200 1. 0 + it It r N., , I '�� I I I W. 4'� WA lt All 'll i VIP 400 PREPARED BY. PRTARE0 FOR. - RJ HOAES RJ HOMER LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 1.1439-061EXHIBITSILANDUSE 7167"CIWAiiiiiiiiiiiiioJ2 Im Gmbft CA sass socrcx Vab- OW20411111211 11M OW21IIII-036 PLANNERS lWal"EMIKS URVEYORS PRTARE0 FOR. - RJ HOAES RJ HOMER LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 1.1439-061EXHIBITSILANDUSE QOM 0 100 200 400 800 tiI • / X21 ♦1 • [ I -*B MOs ! 79_7" OW JW.— L7 vorwusas� RPLANERf •.r. NL7f1JQ1 a"OLTT Mek p►7f14W1G ENGINEERS SURVEYORS Rff HOWS RJT HOMB, LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 CrrY OF LA OUNTA Hydrology & Stormwater Retention Study June 28, 2000 PROPOSED CONDITIONS Proposed Land Use TT 29858 proposes a residential project with a core of interconnected lakes interspersed throughout the project. The lakes are ornamental in nature and are not utilized for stormwater retention. Proposed Topography TT 29858 proposes to grade the project such that all of the ornamental lakes will have one water surface elevation. The lakes will be connected to each other under each of the roads with connector pipes and will have an overflow catch basin on the most easterly end of the lakes. The entire site will be graded extremely flat as a result. The private streets will have mini -sumps for the encatchment points. (See Proposed Topography) Proposed Draina a Facilities TT 29858 proposes to collect the stormwaters in an underground storm drain pipe and convey the stormwaters to the retention basin located at the southwest corner of the project. Rainwater falling on the proposed lakes will be conveyed to the retention basin by an overflow catch basin located at the easterly end of the lake system and an underground storm drain pipe that outlets at the retention basin. (See Proposed Drainage Facilities) RJT Homes TTM 29858 AVEMIF 0 100 200 400 800 STREETS 1 ••/•171 MI 'w PREPARED BY: Bff HOWS afHOW LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 CITY OF LA OLWA I• /4.34—()R /FYWPITI� /T—(:RAPNY no; /?F loo so.:I r+.rtjolr�....sl ir arrtiu mas !O[ICN ICHYL7I FM %W2ffl.1. �LAMN!MS ENGIN!!!S SUavoyc"S Bff HOWS afHOW LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 CITY OF LA OLWA I• /4.34—()R /FYWPITI� /T—(:RAPNY no; /?F loo 50TH AVENUE 0 100 200 400 800 l f xwvi STREETS SD Y If-AKLI) f OK: RJT HOES pAff HDA LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 Nlwr*FZWFIT701111., rt i+ TENTATW MACT . f,. s M OF OWA r o :: a iT-ifM 81 :::::OW* V QMixtiol f2M so�lcx VW- 969.7E141121 1CxULT■ FM s�alan6 fLANNlRS ENGINEERS SUQYEyoos Y If-AKLI) f OK: RJT HOES pAff HDA LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 Nlwr*FZWFIT701111., rt i+ TENTATW MACT . f,. s M OF OWA FHydrology & Stormwater Retention Study June 28, 2000 r Developed Hydrolo y TT 29858 has met all of the goals of its Stormwater Retention Plan by f_ intercepting and conveying all of the onsite and tributary stormflows to an onsite retention basin, sized to accommodate a 100 -year storm in accordance with City policy. (See Proposed Hydrology Map) M G:\439\06\HYD\STUDY-DOC RJT Homes TTM 29858 39.0 A=0.87 ACRES 0 �y -- PROPERTY LINE O DRAINAGE STUDY BOUNDARY z DRAINAGE BASIN BOUNDARY 0 100 200 400 800 -_-::-- SUB -BASIN DRAINAGE BOUNDARY PREPARED BY: 19 34.5 NODE/SURFACE ELEVATION FLOW DIRECTION """• f nu • eocicx ��(� t C M Y L i i FM }My1�t6 AES ALE 7TMW •LA04"IRS 0"GIMIIRS SURYEYot PONDER ON-SITE STORM WATERS(51.36 ACRES) PREPARED FOR: Fkff HOWS Fk f ROWS, LLC 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 FAX (760) 564-6505 EXISTING HYDROLOGY TENTATIVE TRACT No. 29858 GTY OF LA WINTA 1:/439-06/EXHIBITS/HYDRO 06/26/00 ' S 5 , EXISTING HYDROLOGY TENTATIVE TRACT No. 29858 GTY OF LA WINTA 1:/439-06/EXHIBITS/HYDRO 06/26/00 I 355 10 50TH c.e AVENUE 50.01 ..4 r✓ _ -;-: 1--— 3200t. �� .�_ �_.. a.. , �j:L'•`Lv�. ♦ � � . ♦ i k ]9, / .-� f' '•�+#---`i-�"' 1 bi � .1,, -.'. 1. , 1 -. _.. ...1 • j 4,11 � ,. -. �' .hf� i ''1 �f A4 l mac_ f,••.'" .� -''u _-, * f `^ - _'' {'1 an �, S.X r _'�#"•.�'„� «. .f 3�` •r3 T' sig - ! • , s •�,:tN �y .r`• moi' '�: •i4 °. 4 i �- x _ 35.2 �. 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PHONE (760) 564-6555 VI 1 1 OF1..x'1 �A PLANNERS ENGINEERS SURVEYORS FAX (760) 564-6505 **************************************************************************** RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL (c) Copyright 1982-99 Advanced Engineering Software (aes) Ver. 1.5A Release Date: 01/01/99 License ID 1269 Analysis prepared by: MDS CONSULTING _ 17320_Redhill Avenue_,__Suite_35.0___ Irvine, CA 92614 (949) 251-8821 ************************** DESCRIPTION OF STUDY ************************** * TENTATIVE TRACT NO. 29858 * UNDEVELOPED HYDROLOGY * Q100 FREQUENCY ************************************************************************** FILE NAME: TT29858U.DAT TIME/DATE OF STUDY: 13:42 6/28/2000 -------------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: ---------------------------------------------------------------------------- USER SPECIFIED STORM EVENT(YEAR) = 100.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 18.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 2 -YEAR, 1 -HOUR PRECIPITATION(INCH) = 0.500 100 -YEAR, 1 -HOUR PRECIPITATION(INCH) = 1.600 COMPUTED RAINFALL INTENSITY DATA: STORM EVENT = 100.00 1 -HOUR INTENSITY(INCH/HOUR) = 1.6000 SLOPE OF INTENSITY DURATION CURVE = 0.5900 RCFC&WCD HYDROLOGY MANUAL "C" -VALUES USED NOTE: COMPUTE CONFLUENCE VALUES ACCORDING TO RCFC&WCD HYDROLOGY MANUAL AND IGNORE OTHER CONFLUENCE COMBINATIONS FOR DOWNSTREAM ANALYSES **************************************************************************** FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS COMMERCIAL TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 355.00 UPSTREAM ELEVATION = 50.00 DOWNSTREAM ELEVATION = 46.70 ELEVATION DIFFERENCE = 3.30 TC = 0.303*[( 355.00**3)/( 3.30)]**.2 = 8.091 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.218 SOIL CLASSIFICATION IS "A" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8683 SUBAREA RUNOFF(CFS) = 8.16 TOTAL AREA(ACRES) = 1.80 TOTAL RUNOFF(CFS) = 8.16 FLOW PROCESS FROM NODE 2.00 TO NODE 3.00 IS CODE = 52 ------------- >> >>>COMPUTE NATURAL VALLEY CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<< <<< UPSTREAM NODE ELEVATION = 46.70 DOWNSTREAM NODE ELEVATION = 35.70 CHANNEL LENGTH THRU SUBAREA(FEET) = 710.00 CHANNEL SLOPE = 0.0155 CHANNEL FLOW THRU SUBAREA(CFS) = 8.16 FLOW VELOCITY(FEET/SEC) = 2.96 (PER PLATE D-6.1) TRAVEL TIME(MIN.) = 4.00 TC(MIN.) = 12.09 **************************************************************************** FLOW PROCESS FROM NODE 2.00 TO NODE 3.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< ------------------ 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.116 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5331 SUBAREA AREA(ACRES) = 9.40 SUBAREA RUNOFF(CFS) = 20.63 TOTAL AREA(ACRES) = 11.20 TOTAL RUNOFF(CFS) = 28.78 TC(MIN) = 12.09 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 5.00 IS CODE = 21 ------------------------------------------------------------------------------ >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 465.00 UPSTREAM ELEVATION = 37.90 DOWNSTREAM ELEVATION = 34.30 ELEVATION DIFFERENCE = 3.60 TC = 0.533*[( 465.00**3)/( 3.60)]**.2 = 16.429 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.436 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .4932 SUBAREA RUNOFF(CFS) = 8.47 TOTAL AREA(ACRES) = 5.00 TOTAL RUNOFF(CFS) = 8.47 **************************************************************************** FLOW PROCESS FROM NODE 6.00 TO NODE 7.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 975.00 UPSTREAM ELEVATION = 49.00 DOWNSTREAM ELEVATION = 34.80 ELEVATION DIFFERENCE = 14.20 TC = 0.533*[( 975.00**3)/( 14.20)]**.2 = 19.469 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.108 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .4708 SUBAREA RUNOFF(CFS) = 8.63 TOTAL AREA(ACRES) = 5.90 TOTAL RUNOFF(CFS) = 8.63 **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 9.00 IS CODE = 21 >> >>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 120.00 UPSTREAM ELEVATION = 37.40 DOWNSTREAM ELEVATION = 35.40 ELEVATION DIFFERENCE = 2.00 TC = 0.533*[( 120.00**3)/( 2.00)]**.2 = 8.198 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.178 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5817 SUBAREA RUNOFF(CFS) = 2.11 TOTAL AREA(ACRES) = 0.70 TOTAL RUNOFF(CFS) = 2.11 **************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 11.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 160.00 UPSTREAM ELEVATION = 36.10 DOWNSTREAM ELEVATION = 35.50 ELEVATION DIFFERENCE = 0.60 TC = 0.533*[( 160.00**3)/( 0.60)]**.2 = 12.395 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.057 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5299 SUBAREA RUNOFF(CFS) = 2.15 TOTAL AREA(ACRES) = 1.00 TOTAL RUNOFF(CFS) = 2.15 **************************************************************************** FLOW PROCESS FROM NODE 12.00 TO NODE 13.00 IS CODE = 21 ----------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 950.00 UPSTREAM ELEVATION = 36.00 DOWNSTREAM ELEVATION = 33.40 ELEVATION DIFFERENCE = 2.60 TC = 0.533*[( 950.00**3)/( 2.60)]**.2 = 26.918 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.567 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT .4278 SUBAREA RUNOFF(CFS) = 3.73 TOTAL AREA(ACRES) = 3.40 TOTAL RUNOFF(CFS) = 3.73 **************************************************************************** FLOW PROCESS FROM NODE 14.00 TO NODE 15.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 100.00 UPSTREAM ELEVATION = 36.00 DOWNSTREAM ELEVATION = 34.60 ELEVATION DIFFERENCE = 1.40 TC = 0.533*[( 100.00**3)/( 1.40)]**.2 = 7.892 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.295 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5863 SUBAREA RUNOFF(CFS) = 1.55 TOTAL AREA(ACRES) = 0.50 TOTAL RUNOFF(CFS) = 1.55 **************************************************************************** FLOW PROCESS FROM NODE 16.00 TO NODE 17.00 IS CODE = 21 -------------------_-----------------------------------------------------_--- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 560.00 UPSTREAM ELEVATION = 37.70 DOWNSTREAM ELEVATION = 34.20 ELEVATION DIFFERENCE = 3.50 TC = 0.533*[( 560.00**3)/( 3.50)]**.2 = 18.471 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.206 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .4778 SUBAREA RUNOFF(CFS) = 4.26 TOTAL AREA(ACRES) = 2.78 TOTAL RUNOFF(CFS) = 4.26 **************************************************************************** FLOW PROCESS FROM NODE 171.00 TO NODE 172.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 120.00 UPSTREAM ELEVATION = 36.50 DOWNSTREAM ELEVATION = 35.00 ELEVATION DIFFERENCE = 1.50 TC = 0,533*[( 120.00**3)/( 1.50)]**.2 = 8.683 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.005 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .5747 SUBAREA RUNOFF(CFS) = 1.44 TOTAL AREA(ACRES) = 0.50 TOTAL RUNOFF(CFS) - 1.44 **************************************************************************** FLOW PROCESS FROM NODE 18.00 TO NODE 19.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 8.20 UPSTREAM ELEVATION = 36.50 DOWNSTREAM ELEVATION = 34.50 ELEVATION DIFFERENCE = 2.00 TC = 0.533*[( 8.20**3)/( 2.00)]**.2 = 1.639 COMPUTED TIME OF CONCENTRATION INCREASED TO 5 MIN. 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 6.932 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6389 SUBAREA RUNOFF(CFS) = 36.31 TOTAL AREA(ACRES) = 8.20 TOTAL RUNOFF(CFS) = 36.31 **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<< <<< UPSTREAM NODE ELEVATION = 34.50 DOWNSTREAM NODE ELEVATION = 26.60 CHANNEL LENGTH THRU SUBAREA(FEET) = 470.00 CHANNEL SLOPE = 0.0168 CHANNEL FLOW THRU SUBAREA(CFS) = 36.31 FLOW VELOCITY(FEET/SEC) = 4.58 (PER PLATE D-6.1) TRAVEL TIME(MIN.) = 1.71 TC(MIN.) = 6.71 **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 8 --------- ---------------_--------------_-------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW, «< 100 YEAR ^RAINFALL INTENSITY (INCH/HOUR)=!-5lg27 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .6056 SUBAREA AREA(ACRES) = 9.98 SUBAREA RUNOFF(CFS) = 35.22 TOTAL AREA(ACRES) = 18.18 TOTAL RUNOFF(CFS) = 71.53 TC(MIN) = 6.71 FLOW PROCESS FROM NODE 21.00 TO NODE 22.00 IS CODE = 21 ------------------------------------------------------------------------------ V >> >>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS: UNDEVELOPED WITH POOR COVER TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 600.00 UPSTREAM ELEVATION = 35.00 DOWNSTREAM ELEVATION = 32.20 ELEVATION DIFFERENCE = 2.80 TC = 0.533*[( 600.00**3)/( 2.80)]**.2 = 20.131 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.048 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .4664 SUBAREA RUNOFF(CFS) = 3.13 TOTAL AREA(ACRES) = 2.20 TOTAL RUNOFF(CFS) = 3.13 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 24.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS COMMERCIAL TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 1100.00 UPSTREAM ELEVATION = 39.00 DOWNSTREAM ELEVATION = 34.70 ELEVATION DIFFERENCE = 4.30 TC = 0.303*[( 1100.00**3)/( 4.30)]**.2 = 15.126 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.607 SOIL CLASSIFICATION IS "A" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8604 SUBAREA RUNOFF(CFS) = 2.70 TOTAL AREA(ACRES) = 0.87 TOTAL RUNOFF(CFS) = 2.70 **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 25.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<<<<< >>>>>TRAVELTIME THRU SUBAREA<<<<< UPSTREAM NODE ELEVATION = 34.70 DOWNSTREAM NODE ELEVATION = 34.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 475.00 CHANNEL SLOPE = 0.0015 CHANNEL FLOW THRU SUBAREA(CFS) = 2.70 FLOW VELOCITY(FEET/SEC) = 0.70 (PER PLATE D-6.1) TRAVEL TIME(MIN.) = 11.24 TC(MIN.) = 26.37 **************************************************************************** FLOW PROCESS FROM NODE 24.00 TO NODE 25.00 IS CODE = 8 --------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.599 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .4306 SUBAREA AREA(ACRES) = 7.63 SUBAREA RUNOFF(CFS) = 8.54 TOTAL AREA(ACRES) = 8.50 TOTAL RUNOFF(CFS) = 11.24 TC(MIN) = 26.37 **************************************************************************** FLOW PROCESS FROM NODE 25.00 TO NODE 26.00 IS CODE = 52 ---------------------------------------------------------------------------- >>>>>COMPUTE NATURAL VALLEY CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<< <<< UPSTREAM NODE ELEVATION = 34.00 DOWNSTREAM NODE ELEVATION = 31.50 CHANNEL LENGTH THRU SUBAREA(FEET) = 1350.00 CHANNEL SLOPE = 0.0019 CHANNEL FLOW THRU SUBAREA(CFS) = 11.24 FLOW VELOCITY(FEET/SEC) = 1.11 (PER PLATE D-6.1) TRAVEL TIME(MIN.) = 20.31 TC(MIN.) = 46.67 **************************************************************************** FLOW PROCESS FROM NODE 25.00 TO NODE 26.00 IS CODE = 8 --------------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 1.856 SOIL CLASSIFICATION IS "A" UNDEVELOPED WATERSHED RUNOFF COEFFICIENT = .3562 SUBAREA AREA(ACRES) = 17.00 SUBAREA RUNOFF(CFS) = 11.24 TOTAL AREA(ACRES) = 25.50 TOTAL RUNOFF(CFS) = 22.47 TC(MIN) = 46.67 END OF STUDY SUMMARY: PEAK FLOW RATE(CFS) = 22.47 Tc(MIN.) = 46.67 TOTAL AREA(ACRES) = 25.50 END OF RATIONAL METHOD ANALYSIS 1 RATIONAL METHOD HYDROLOGY COMPUTER PROGRAM BASED ON RIVERSIDE COUNTY FLOOD CONTROL & WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL (c) Copyright 1982-99 Advanced Engineering Software (aes) Ver. 1.5A Release Date: 01/01/99 License ID 1269 Analysis prepared by: MDS CONSULTING 17320--Redhill-Avenue-,- Suite _350— Irvine, CA 92614 (949) 251-8821 ************************** DESCRIPTION OF STUDY ************************** * TENTATIVE TRACT NO. 29858 * DEVELOPED HYDROLOGY * Q100 FREQUENCY ************************************************************************** FILE NAME: TT29858D.DAT TIME/DATE OF STUDY: 14:50 6/28/2000 ---------------------------------------------------------------------------- USER SPECIFIED HYDROLOGY AND HYDRAULIC MODEL INFORMATION: -----------------------------------------------------__-----_----_-_._.._----__----- USER SPECIFIED STORM EVENT(YEAR) = 100.00 SPECIFIED MINIMUM PIPE SIZE(INCH) = 18.00 SPECIFIED PERCENT OF GRADIENTS(DECIMAL) TO USE FOR FRICTION SLOPE = 0.95 2 -YEAR, 1 -HOUR PRECIPITATION(INCH) = 0.500 100 -YEAR, 1 -HOUR PRECIPITATION(INCH) = 1.600 COMPUTED RAINFALL INTENSITY DATA: STORM EVENT = 100.00 1 -HOUR INTENSITY(INCH/HOUR) = 1.6000 SLOPE OF INTENSITY DURATION CURVE = 0.5900 RCFC&WCD HYDROLOGY MANUAL "C" -VALUES USED NOTE: COMPUTE CONFLUENCE VALUES ACCORDING TO RCFC&WCD HYDROLOGY MANUAL AND IGNORE OTHER CONFLUENCE COMBINATIONS FOR DOWNSTREAM ANALYSES **************************************************************************** FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS COMMERCIAL TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 355.00 UPSTREAM ELEVATION = 50.00 DOWNSTREAM ELEVATION = 46.70 ELEVATION DIFFERENCE = 3.30 TC = 0.303*[( 355.00**3)/( 3.30)]**.2 = 8.091 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 5.218 SOIL CLASSIFICATION IS "A" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8683 SUBAREA RUNOFF(CFS) = 8.16 TOTAL AREA(ACRES) = 1.80 TOTAL RUNOFF(CFS) = 8.16 FLOW PROCESS FROM NODE 2.00 TO NODE 3.00 IS CODE = 52 >> >>>COMPUTE NATURAL VALLEY CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<< <<< UPSTREAM NODE ELEVATION = 46.70 DOWNSTREAM NODE ELEVATION = 34.50 CHANNEL LENGTH THRU SUBAREA(FEET) = 1320.00 CHANNEL .SLOPE = 0.0092 CHANNEL FLOW THRU SUBAREA(CFS) = 8.16 FLOW VELOCITY(FEET/SEC) = 2.28 (PER PLATE D-6.1) TRAVEL TIME(MIN.) = 9.64 TC(MIN.) = 17.73 FLOW PROCESS FROM NODE 2.00 TO NODE 3.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.285 SOIL CLASSIFICATION IS "A" COMMERCIAL DEVELOPMENT RUNOFF COEFFICIENT = .8583 SUBAREA AREA(ACRES) = 2.10 SUBAREA RUNOFF(CFS) = 5.92 TOTAL AREA(ACRES) = 3.90 TOTAL RUNOFF(CFS) = 14.08 TC(MIN) = 17.73 **************************************************************************** FLOW PROCESS FROM NODE 3.00 TO NODE 4.00 IS CODE = 3 >> >>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<<<<< ---------- DEPTH OF FLOW IN 30.0 INCH PIPE IS 20.6 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 3.9 UPSTREAM NODE ELEVATION = 30.50 DOWNSTREAM NODE ELEVATION = 30.00 FLOWLENGTH(FEET) = 270.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 30.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 14.08 TRAVEL TIME(MIN.) = 1.15 TC(MIN.) = 18.88 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 4.00 IS CODE = 1 ----------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 18.88 RAINFALL INTENSITY(INCH/HR) = 3.17 TOTAL STREAM AREA(ACRES) = 3.90 PEAK FLOW RATE(CFS) AT CONFLUENCE = 14.08 FLOW PROCESS FROM NODE 31.00 TO NODE 4.00 IS CODE = 21 >> >>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED TINITIAL SUBAREA UNIFORM===-='_____________-��--_-_____-__._ DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 ' INITIAL SUBAREA FLOW -LENGTH = 280.00 UPSTREAM ELEVATION_ _ _ 38-00 DOWNSTREAM ELEVATION = 34.50 ELEVATION DIFFERENCE = 3.50 TC = 0.393*[( 280.00**3)/( 3.50)]**.2 = 8.983 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.906 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7353 SUBAREA RUNOFF(CFS) = 5.63 TOTAL AREA(ACRES) = 1.56 TOTAL RUNOFF(CFS) 5.63 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 4.00 IS CODE = 1 ----------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< >> >>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 8.98 RAINFALL INTENSITY(INCH/HR) = 4.91 TOTAL STREAM AREA(ACRES) = 1.56 PEAK FLOW RATE(CFS) AT CONFLUENCE = 5.63 ** CONFLUENCE DATA ** Tc INTENSITY STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 14.08 18.88 3.165 3.90 2 5.63 8.98 4.906 1.56 *********************************WARNING********************************** IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 12.32 8.98 4.906 2 17.71 18.88 3.165 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 17.71 Tc(MIN.) 18.88 TOTAL AREA(ACRES) = 5.46 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 5.00 IS CODE = 3 ---------------__----_---------------------_-.._---------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 30.0 INCH PIPE IS 22.5 INCHES - --- P-I-PEF-LOW VELOCITY --(-FEET-/SEC.-) -= 4 . 5 UPSTREAM NODE ELEVATION = 30.00 DOWNSTREAM NODE ELEVATION = 29.60 FLOWLENGTH(FEET) = 170.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 30.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 17.71 TRAVEL TIME(MIN.) = 0.63 TC(MIN.) = 19.51 **************************************************************************** FLOW PROCESS FROM NODE 5.00 TO NODE 5.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 19.51 RAINFALL INTENSITY(INCH/HR) = 3.10 TOTAL STREAM AREA(ACRES) = 5.46 PEAK FLOW RATE(CFS) AT CONFLUENCE = 17.71 **************************************************************************** FLOW PROCESS FROM NODE 6.00 TO NODE 7.00 IS CODE = 21 ------------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 650.00 UPSTREAM ELEVATION = 38.50 DOWNSTREAM ELEVATION = 34.50 ELEVATION DIFFERENCE = 4.00 TC = 0.393*[( 650.00**3)/( 4.00)]**.2 = 14.497 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.699 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7048 SUBAREA RUNOFF(CFS) = 11.78 TOTAL AREA(ACRES) = 4.52 TOTAL RUNOFF(CFS) = 11.78 **************************************************************************** FLOW PROCESS FROM NODE 7.00 TO NODE 4.00 IS CODE = 3 ----------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 27.0 INCH PIPE IS 18.3 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 4.1 UPSTREAM NODE ELEVATION = 30.00 DOWNSTREAM NODE ELEVATION = 29.60 FLOWLENGTH(FEET) = 170.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 27.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 11.78 TRAVEL TIME(MIN.) = 0.69 TC(MIN.) = 15.19 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 4.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< >> >>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 15.19 RAINFALL INTENSITY(INCH/HR) = 3.60 TOTAL STREAM AREA(ACRES) = 4.52 PEAK FLOW RATE(CFS) AT CONFLUENCE = 11.78 ** CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 17.71 19.51 3.104 5.46 2 11.78 15.19 3.599 4.52 IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 25.57 15.19 3.599 2 27.87 19.51 3.104 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 27.87 Tc(MIN.) = 19.51 TOTAL AREA(ACRES) = 9.98 **************************************************************************** FLOW PROCESS FROM NODE 4.00 TO NODE 8.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<<<<< DEPTH OF FLOW IN 30.0 INCH PIPE IS 20.9 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 7.6 UPSTREAM NODE ELEVATION = 29.60 DOWNSTREAM NODE ELEVATION = 28.20 FLOWLENGTH(FEET) = 200.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 30.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 27.87 TRAVEL TIME(MIN.) = 0.44 TC(MIN.) = 19.95 **************************************************************************** FLOW --PROCESS FROM -NODE ---8-.00 TO -NODE- - -- -8 . 00--ISCODE--=-- 1- ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 19.95 RAINFALL INTENSITY(INCH/HR) = 3.06 TOTAL STREAM AREA(ACRES) = 9.98 PEAK FLOW RATE(CFS) AT CONFLUENCE = 27.87 **************************************************************************** FLOW PROCESS FROM NODE 9.00 TO NODE 10.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 580.00 UPSTREAM ELEVATION = 37.20 DOWNSTREAM ELEVATION = 34.00 ELEVATION DIFFERENCE = 3.20 TC = 0.393*[( 580.00**3)/( 3.20)]**.2 = 14.157 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.751 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7064 SUBAREA RUNOFF(CFS) = 11.39 TOTAL AREA(ACRES) = 4.30 TOTAL RUNOFF(CFS) = 11.39 **************************************************************************** FLOW PROCESS FROM NODE 10.00 TO NODE 11.00 IS CODE = 3 ----------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 24.0 INCH PIPE IS 19.1 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 4.3 UPSTREAM NODE ELEVATION = 30.00 DOWNSTREAM NODE ELEVATION = 28.70 FLOWLENGTH(FEET) = 460.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 24.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 11.39 TRAVEL TIME(MIN.) = 1.80 TC(MIN.) = 15.96 **************************************************************************** FLOW PROCESS FROM NODE 11.00 TO NODE 11.00 IS CODE = 8 ------------------------------------------------------------------------------ >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.495 ^l^� SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6985 SUBAREA AREA(ACRES) = 5.30 SUBAREA RUNOFF(CFS) = 12.94 TOTAL AREA(ACRES) -9 � 60 TOTAL RUNOFF ( CFS-)= 24.33- -- TC(MIN) TC(MIN) = 15.96 **************************************************************************** FLOW PROCESS FROM NODE 11.00 TO NODE 8.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 39.0 INCH PIPE IS 29.1 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 3.7 UPSTREAM NODE ELEVATION = 28.70 DOWNSTREAM NODE ELEVATION = 28.20 FLOWLENGTH(FEET) = 450.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 39.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 24.33 TRAVEL TIME(MIN.) = 2.05 TC(MIN.) = 18.01 **************************************************************************** FLOW PROCESS FROM NODE 8.00 TO NODE 8.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< >> >>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 18.01 RAINFALL INTENSITY(INCH/HR) = 3.25 TOTAL STREAM AREA(ACRES) = 9.60 PEAK FLOW RATE(CFS) AT CONFLUENCE = 24.33 ** CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 27.87 19.95 3.064 9.98 2 24.33 18.01 3.255 9.60 *********************************WARNING********************************** IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 49.49 18.01 3.255 2 50.78 19.95 3.064 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 50.78 Tc(MIN.) = 19.95 TOTAL AREA(ACRES) = 19.58 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*xxxxxxx FLOW PROCESS FROM NODE 8.00 TO NODE 13.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<<<<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 39.0 INCH PIPE IS 29.2 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 7.6 UPSTREAM NODE ELEVATION = 28.20 DOWNSTREAM NODE ELEVATION = 26.90 FLOWLENGTH(FEET) = 270.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 39.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 50.78 TRAVEL TIME(MIN.) = 0.59 TC(MIN.) = 20.54 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx*xxxxxxxxxxxxxxxxxxxxxxx FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 10 >> >>>MAIN -STREAM MEMORY COPIED ONTO MEMORY BANK # 1 <<<<< xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx FLOW PROCESS FROM NODE 15.00 TO NODE 16.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM -- DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 455.00 UPSTREAM ELEVATION = 37.50 DOWNSTREAM ELEVATION = 34.40 ELEVATION DIFFERENCE = 3.10 TC = 0.393*[( 455.00**3)/( 3.10)]**.2 = 12.316 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.072 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7154 SUBAREA RUNOFF(CFS) = 14.51 TOTAL AREA(ACRES) = 4.98 TOTAL RUNOFF(CFS) = 14.51 xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx FLOW PROCESS FROM NODE 16.00 TO NODE 17.00 IS CODE = 3 ------------------------------------------------------------ >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 30.0 INCH PIPE IS 20.5 INCHES [� PIPEFLOW VELOCITY(FEET/SEC.) = 4.1 UPSTREAM NODE ELEVATION = 30.40 DOWNSTREAM NODE ELEVATION = 29.30 FLOWLENGTH(FEET) = 550.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 30.00 NUMBER OF PIPES = 1 PIPEFLOW__'HRU_SUBAREA(-CFS) = 14.5-1 - TRAVEL TIME(MIN.) = 2.26 TC(MIN.) = 14.58 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< --------------- 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.687 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7045 SUBAREA AREA(ACRES) = 5.86 SUBAREA RUNOFF(CFS) = 15.22 TOTAL AREA(ACRES) = 10.84 TOTAL RUNOFF(CFS) = 29.73 TC(MIN) = 14.58 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 14.58 RAINFALL INTENSITY(INCH/HR) = 3.69 TOTAL STREAM AREA(ACRES) = 10.84 PEAK FLOW RATE(CFS) AT CONFLUENCE = 29.73 **************************************************************************** FLOW PROCESS FROM NODE 19.00 TO NODE 20.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<< <<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 575.00 UPSTREAM ELEVATION = 38.00 DOWNSTREAM ELEVATION = 35.00 ELEVATION DIFFERENCE = 3.00 TC = 0.393*[( 575.00**3)/( 3.00)]**.2 = 14.267 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.734 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7059 SUBAREA RUNOFF(CFS) = 10.44 TOTAL AREA(ACRES) = 3.96 TOTAL RUNOFF(CFS) = 10.44 **************************************************************************** FLOW PROCESS FROM NODE 20.00 TO NODE 17.00 IS CODE = 3 ----------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 27.0 INCH PIPE IS 18.4 INCHES PIPEFLOW- VELOC-IT-Y( FEET/ -SEC -) - =- 3-. 6- - - UPSTREAM NODE ELEVATION = 30.10 DOWNSTREAM NODE ELEVATION = 29.30 FLOWLENGTH(FEET) = 440.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 27.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 10.44 TRAVEL TIME(MIN.) = 2.03 TC(MIN.) = 16.30 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 17.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< >> >>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<< <<< TOTAL NUMBER OF STREAMS = 2 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 16.30 RAINFALL INTENSITY(INCH/HR) = 3.45 TOTAL STREAM AREA(ACRES) = 3.96 PEAK FLOW RATE(CFS) AT CONFLUENCE = 10.44 ** CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 29.73 14.58 3.687 10.84 2 10.44 16.30 3.452 3.96 IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 2 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 39.06 14.58 3.687 2 38.27 16.30 3.452 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 39.06 Tc(MIN.) = 14.58 TOTAL AREA(ACRES) = 14.80 **************************************************************************** FLOW PROCESS FROM NODE 17.00 TO NODE 21.00 IS CODE = 3 ------------------- >> >>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 42.0 INCH PIPE IS 31.0 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 5.1 UPSTREAM NODE ELEVATION = 29.30 -DOWNS-T-REAM--NODE-ELzEVAT-ION = 2-8 . 3-0- - FLOWLENGTH(FEET) = 505.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 42.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA(CFS) = 39.06 TRAVEL TIME(MIN.) = 1.64 TC(MIN.) = 16.22 **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 21.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.462 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6975 SUBAREA AREA(ACRES) = 4.74 SUBAREA RUNOFF(CFS) = 11.45 TOTAL AREA(ACRES) = 19.54 TOTAL RUNOFF(CFS) = 50.51 TC(MIN) = 16.22 **************************************************************************** FLOW PROCESS FROM NODE 21.00 TO NODE 23.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<<<<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 45.0 INCH PIPE IS 34.7 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 5.5 UPSTREAM NODE ELEVATION = 28.30 DOWNSTREAM NODE ELEVATION = 27.70 FLOWLENGTH(FEET) = 290.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 45.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 50.51 TRAVEL TIME(MIN.) = 0.88 TC(MIN.) = 17.09 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 23.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.356 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6940 SUBAREA AREA(ACRES) = 5.37 SUBAREA RUNOFF(CFS) = 12.51 TOTAL AREA(ACRES) = 24.91 TOTAL RUNOFF(CFS) = 63.02 TC(MIN) = 17.09 **************************************************************************** FLOW PROCESS FROM NODE 23.00 TO NODE 13.00 IS CODE = 3 >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<<<<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 51.0 INCH PIPE IS 37.0 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 5.7 - --- -UPSTREAM NODE- ELEVATION = -----27- 7 -0 --- DOWNSTREAM NODE ELEVATION = 26.90 FLOWLENGTH(FEET) = 420.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 51.00 NUMBER OF PIPES 1 PIPEFLOW THRU SUBAREA(CFS) = 63.02 TRAVEL TIME(MIN.) = 1.23 TC(MIN.) = 18.32 **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.222 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6894 SUBAREA AREA(ACRES) = 2.37 SUBAREA RUNOFF(CFS) = 5.26 TOTAL AREA(ACRES) = 27.28 TOTAL RUNOFF(CFS) = 68.28 TC(MIN) = 18.32 **************************************************************************** FLOW PROCESS FROM NODE 13.00 TO NODE 13.00 IS CODE = 11 ---------------------------------------------------------------------------- >>>>>CONFLUENCE MEMORY BANK # 1 WITH THE MAIN -STREAM MEMORY<< <<< ** MAIN STREAM CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 68.28 18.32 3.222 27.28 ** MEMORY BANK # 1 CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 50.78 20.54 3.012 19.58 IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 113.57 18.32 3.222 2 114.60 20.54 3.012 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 113.57 TC(MIN.) = 18.32 TOTAL AREA(ACRES) = 46.86 FLOW PROCESS FROM NODE 13.00 TO NODE 25.00 IS CODE = 3 ----------------------------------------------------------------------------- - >a» >COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 63.0 INCH PIPE IS 47.3 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 6.5 UPSTREAM NODE ELEVATION = 26.90 DOWNSTREAM NODE ELEVATION = 26.40 FLOWLENGTH(FEET) = 270.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 63.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 113.57 TRAVEL TIME(MIN.) = 0.69 TC(MIN.) = 19.01 **************************************************************************** FLOW PROCESS FROM NODE 25.00 TO NODE 25.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 3.152 T^^ SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6870 SUBAREA AREA(ACRES) = 2.78 SUBAREA RUNOFF(CFS) = 6.02 TOTAL AREA(ACRES) = 49.64 TOTAL RUNOFF(CFS) = 119.59 TC(MIN) = 19.01 **************************************************************************** FLOW PROCESS FROM NODE 25.00 TO NODE 27.00 IS CODE = 3 >> >>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 66.0 INCH PIPE IS 50.1 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 6.2 UPSTREAM NODE ELEVATION = 26.40 DOWNSTREAM NODE ELEVATION = 25.40 FLOWLENGTH(FEET) = 640.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 66.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 119.59 TRAVEL TIME(MIN.) = 1.73 TC(MIN.) = 20.73 **************************************************************************** FLOW PROCESS FROM NODE 27.00 TO NODE 27.00 IS CODE = 8 ------------------------------------------------------------------------------ >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.995 ----____ SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6812 SUBAREA AREA(ACRES) = 3.80 SUBAREA RUNOFF(CFS) = 7.75 TOTAL AREA(ACRES) = 53.44 TOTAL RUNOFF(CFS) = 127.34 TC(MIN) = 20.73 **************************************************************************** FLOW PROCESS FROM NODE 27.00 TO NODE 29.00 IS CODE = 3 >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 63.0 INCH PIPE IS 50.8 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 6.8 UPSTREAM NODE ELEVATION = 25.40 DOWNSTREAM NODE ELEVATION = 25.10 FLOWLENGTH(FEET) = 150.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 63.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 127.34 TRAVEL TIME(MIN.) = 0.37 TC(MIN.) = 21.10 **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 29.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE« <<< TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 1 ARE: TIME OF CONCENTRATION(MIN.) = 21.10 RAINFALL INTENSITY(INCH/HR) = 2.96 TOTAL STREAM AREA(ACRES) = 53.44 PEAK FLOW RATE(CFS) AT CONFLUENCE = 127.34 **************************************************************************** FLOW PROCESS FROM NODE 30.00 TO NODE 31.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 420.00 UPSTREAM ELEVATION = 38.50 DOWNSTREAM ELEVATION = 35.00 ELEVATION DIFFERENCE = 3.50 TC = 0.393*[( 420.00**3)/( 3.50)]**.2 = 11.457 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.250 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7200 SUBAREA RUNOFF(CFS) = 10.34 TOTAL AREA(ACRES) = 3.38 TOTAL RUNOFF(CFS) = 10.34 **************************************************************************** FLOW PROCESS FROM NODE 31.00 TO NODE 29.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >> >>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 18.0 INCH PIPE IS 11.6 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 8.6 UPSTREAM NODE ELEVATION = 31.00 DOWNSTREAM NODE ELEVATION = 25.10 - - - FLOWLENGTH (FEET) _ - 32-0.00--MANNING-S- N= --O 013 - ESTIMATED PIPE DIAMETER(INCH) = 18.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 10.34 TRAVEL TIME(MIN.) = 0.62 TC(MIN.) = 12.08 **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 29.00 IS CODE = 1 ---------------------------------------------------------------------------- >>>>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 2 ARE: TIME OF CONCENTRATION(MIN.) = 12.08 RAINFALL INTENSITY(INCH/HR) = 4.12 TOTAL STREAM AREA(ACRES) = 3.38 PEAK FLOW RATE(CFS) AT CONFLUENCE = 10.34 **************************************************************************** FLOW PROCESS FROM NODE 50.00 TO NODE 51.00 IS CODE = 21 ---------------------------------------------------------------------------- >>>>>RATIONAL METHOD INITIAL SUBAREA ANALYSIS<<<<< ASSUMED INITIAL SUBAREA UNIFORM DEVELOPMENT IS SINGLE FAMILY (1/4 ACRE) TC = K*[(LENGTH**3)/(ELEVATION CHANGE)]**.2 INITIAL SUBAREA FLOW -LENGTH = 385.00 UPSTREAM ELEVATION = 36.00 DOWNSTREAM ELEVATION = 34.10 ELEVATION DIFFERENCE = 1.90 TC = 0.393*L( 385.00**3)/( 1.90)]**.2 = 12.288 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 4.078 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .7155 SUBAREA RUNOFF(CFS) = 5.78 TOTAL AREA(ACRES) = 1.98 TOTAL RUNOFF(CFS) = 5.78 **************************************************************************** FLOW PROCESS FROM NODE 51.00 TO NODE 52.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<<<<< UPSTREAM NODE ELEVATION = 34.10 DOWNSTREAM NODE ELEVATION = 34.00 CHANNEL LENGTH THRU SUBAREA(FEET) = 1050.00 CHANNEL SLOPE = 0.0001 CHANNEL BASE(FEET) = 50.00 "Z" FACTOR = 99.990 MANNING'S FACTOR = 0.005 MAXIMUM DEPTH(FEET) = 3.00 CHANNEL FLOW THRU SUBAREA(CFS) = 5.78 FLOW VELOCITY(FEET/SEC) = 0.68 FLOW DEPTH(FEET) = 0.13 TRAVEL TIME(MIN.) = 25.84 TC(MIN.) = 38.13 **************************************************************************** - - FLOW PROCESS FROM NODE 52.00 TO NODE 52.00 IS -CODE -=---8 ------_--------------------------------------------------... ------------------- >> >>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< A-100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.091 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6411 SUBAREA AREA(ACRES) = 8.29 SUBAREA RUNOFF(CFS) = 11.11 TOTAL AREA(ACRES) = 10.27 TOTAL RUNOFF(CFS) = 16.89 TC(MIN) = 38.13 FLOW PROCESS FROM NODE 52.00 TO NODE 53.00 IS CODE = 51 ---------------------------------------------------------------------------- >>>>>COMPUTE TRAPEZOIDAL CHANNEL FLOW<< <<< >>>>>TRAVELTIME THRU SUBAREA<< <<< UPSTREAM NODE ELEVATION = 34.00 DOWNSTREAM NODE ELEVATION = 33.90 CHANNEL LENGTH THRU SUBAREA(FEET) = 900.00 CHANNEL SLOPE = 0.0001 CHANNEL BASE(FEET) = 50.00 "Z" FACTOR = 99.990 MANNING'S FACTOR = 0.005 MAXIMUM DEPTH(FEET) = 3.00 CHANNEL FLOW THRU SUBAREA(CFS) = 16.69 FLOW VELOCITY(FEET/SEC) = 0.99 FLOW DEPTH(FEET) = 0.23 TRAVEL TIME(MIN.) = 15.23 TC(MIN.) = 53.36 **************************************************************************** FLOW PROCESS FROM NODE 53.00 TO NODE 53.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<< <<< 100- YEAR �RAINFALL INTENSITY(INCH/HOUR) = 1.715 SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6197 SUBAREA AREA(ACRES) = 4.10 SUBAREA RUNOFF(CFS) = 4.36 TOTAL AREA(ACRES) = 14.37 TOTAL RUNOFF(CFS) = 21.24 TC(MIN) = 53.36 **************************************************************************** FLOW PROCESS FROM NODE 53.00 TO NODE 29.00 IS CODE = 3 ---------------------------------------------------------------------------- >>>>>COMPUTE PIPEFLOW TRAVELTIME THRU SUBAREA<< <<< >>>>>USING COMPUTER -ESTIMATED PIPESIZE (NON -PRESSURE FLOW)<< <<< DEPTH OF FLOW IN 27.0 INCH PIPE IS 18.6 INCHES PIPEFLOW VELOCITY(FEET/SEC.) = 7.3 UPSTREAM NODE ELEVATION = 30.00 DOWNSTREAM NODE ELEVATION = 25.10 FLOWLENGTH(FEET) = 660.00 MANNING'S N = 0.013 ESTIMATED PIPE DIAMETER(INCH) = 27.00 NUMBER OF PIPES = 1 PIPEFLOW THRU SUBAREA(CFS) = 21.24 TRAVEL TIME(MIN.) = 1.51 TC(MIN.) = 54.86 **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 29.00 IS CODE = 1 >> >>>DESIGNATE INDEPENDENT STREAM FOR CONFLUENCE<< <<< >>>>>AND COMPUTE VARIOUS CONFLUENCED STREAM VALUES<<<<< TOTAL NUMBER OF STREAMS = 3 CONFLUENCE VALUES USED FOR INDEPENDENT STREAM 3 ARE: TIME OF CONCENTRATION(MIN.) = 54.86 RAINFALL INTENSITY(INCH/HR) = 1.69 TOTAL STREAM AREA(ACRES) = 14.37 PEAK FLOW RATE(CFS) AT CONFLUENCE = 21.24 ** CONFLUENCE DATA ** STREAM RUNOFF Tc INTENSITY AREA NUMBER (CFS) (MIN.) (INCH/HOUR) (ACRE) 1 127.34 21.10 2.964 53.44 2 10.34 12.08 4.120 3.38 3 21.24 54.86 1.687 14.37 IN THIS COMPUTER PROGRAM, THE CONFLUENCE VALUE USED IS BASED ON THE RCFC&WCD FORMULA OF PLATE D-1 AS DEFAULT VALUE. THIS FORMULA WILL NOT NECESSARILY RESULT IN THE MAXIMUM VALUE OF PEAK FLOW. ************************************************************************** RAINFALL INTENSITY AND TIME OF CONCENTRATION RATIO CONFLUENCE FORMULA USED FOR 3 STREAMS. ** PEAK FLOW RATE TABLE ** STREAM RUNOFF Tc INTENSITY NUMBER (CFS) (MIN.) (INCH/HOUR) 1 87.89 12.08 4.120 2 142.95 21.10 2.964 3 97.95 54.86 1.687 COMPUTED CONFLUENCE ESTIMATES ARE AS FOLLOWS: PEAK FLOW RATE(CFS) = 142.95 Tc(MIN.) = 21.10 TOTAL AREA(ACRES) = 71.19 **************************************************************************** FLOW PROCESS FROM NODE 29.00 TO NODE 29.00 IS CODE = 8 ---------------------------------------------------------------------------- >>>>>ADDITION OF SUBAREA TO MAINLINE PEAK FLOW<<<<< 100 YEAR RAINFALL INTENSITY(INCH/HOUR) = 2.964 �- SOIL CLASSIFICATION IS "A" SINGLE-FAMILY(1/4 ACRE LOT) RUNOFF COEFFICIENT = .6801 SUBAREA AREA(ACRES) - 3.17 SUBAREA RUNOFF(CFS) = 6.39 TOTAL AREA(ACRES) = 74.36 TOTAL RUNOFF(CFS) = 149.34 TC(MIN) = 21.10 END OF STUDY SUMMARY: PEAK FLOW RATE(CFS) = 149.34 Tc(MIN.) = 21.10 TOTAL AREA(ACRES) = 74.36 END OF RATIONAL METHOD ANALYSIS 1 F L O O D R O U T I N G A N A L Y S I S ACCORDING TO RIVERSIDE COUNTY FLOOD CONTORL AND WATER CONSERVATION DISTRICT (RCFC&WCD) 1978 HYDROLOGY MANUAL (c) Copyright 1989-99 Advanced Engineering Software (aes) Ver. 7.0 Release Date: 01/01/99 License ID 1269 Analysis prepared by: MDS CONSULTING 17320 REDHILL AVE. STE. 350 IRVINE, CA 92714 PH 949 251-8821 FAX 949 251-0516 FILE NAME: 29858UH.DAT TIME/DATE OF STUDY: 17:35 06/29/2000 FLOW PROCESS FROM NODE 1.00 TO NODE 2.00 IS CODE = 1 ->> >>>SUBAREA RUNOFF (UNIT-HYDROGRAPH ANALYSIS)<< <<< (UNIT-HYDROGRAPH ADDED TO STREAM ##1) WATERCOURSE LENGTH = 3155.000 FEET LENGTH FROM CONCENTRATION POINT TO CENTROID 1400.000 FEET ELEVATION VARIATION ALONG WATERCOURSE = 24.900 FEET BASIN FACTOR = 0.015 WATERSHED AREA = 74.400 ACRES BASEFLOW = 0.000 CFS/SQUARE-MILE WATERCOURSE "LAG" TIME = 0.088 HOURS CAUTION: LAG TIME IS LESS THAN 0.50 HOURS. THE 5 -MINUTE PERIOD UH MODEL (USED IN THIS COMPUTER PROGRAM) MAY BE TOO LARGE FOR PEAK FLOW ESTIMATES. DESERT S -GRAPH SELECTED UNIFORM MEAN SOIL-LOSS(INCH/HOUR) = 0.200 LOW SOIL -LOSS RATE PERCENT(DECIMAL) = 0.800 MINIMUM SOIL -LOSS RATE(INCH/HOUR) = 0.100 USER -ENTERED RAINFALL = 4.50 INCHES RCFC&WCD 24 -Hour Storm (30 -Minute period) SELECTED RCFC&WCD DEPTH -AREA ADJUSTMENT FACTOR(PLATE E-5.8) = 0.9999 UNIT HYDROGRAPH TIME UNIT = 30.000 MINUTES UNIT INTERVAL PERCENTAGE OF LAG -TIME = 568.184 UNIT HYDROGRAPH DETERMINATION ----------------------------------------------------------------_-------------- INTERVAL "S" GRAPH UNIT HYDROGRAPH NUMBER ____ ___ MEAN -VALUES -_----_-'F----------CFS)____-T `44 1 74.251 111.349 2 99.628 38.056 3 99.851 0.335 4_ 4 99.963 0.167 5 100.000 0.056 TOTAL STORM RAINFALL(INCHES) = 4.50 TOTAL SOIL-LOSS(INCHES) = 2.58 TOTAL EFFECTIVE RAINFALL(INCHES) = 1.92 UNIT UNIT UNIT EFFECTIVE PERIOD RAINFALL SOIL -LOSS RAINFALL (NUMBER) (INCHES) ..----------------------------------------- (INCHES) ------------------------- (INCHES) ------ -----_--1 ----------------------------------- 1 0.0225 0.0180 0.0045 2 0.0315 0.0252 0.0063 3 0.0270 0.0216 0.0054 4 0.0315 0.0252 0.0063 5 0.0360 0.0288 0.0072 6 0.0450 0.0360 0.0090 7 0.0450 0.0360 0.0090 r 8 0.0495 0.0396 0.0099 I^ 9 0.0585 0.0468 0.0117 10 0.0675 0.0540 0.0135 11 0.0585 0.0468 0.0117 12 0.0720 0.0576 0.0144 13 0.0810 0.0648 0.0162 14 0.0900 0.0720 0.0180 15 0.0945 0.0756 0.0189 16 0.1125 0.0900 0.0225 CI 17 0.1350 0.1080 0.0270 18 0.1485 0.1132 0.0353 19 0.1755 0.1100 0.0655 20 0.1935 0.1069 0.0866 21 0.1350 0.1038 0.0312 22 0.1800 0.1008 0.0792 23 0.1710 0.0979 0.0731 24 0.1575 0.0950 0.0625 25 0.2295 0.0922 0.1373 26 0.2565 0.0894 0.1670 27 0.3060 0.0868 0.2192 28 0.2070 0.0841 0.1228 29 0.2385 0.0816 0.1569 30 0.2295 0.0791 0.1504 31 0.2115 0.0767 0.1348 32 0.1710 0.0744 0.0966 33 0.0360 0.0288 0.0072 34 0.0270 0.0216 0.0054 35 0.0450 0.0360 0.0090 36 0.0405 0.0324 0.0081 37 0.0360 0.0288 0.0072 38 0.0225 0.0180 0.0045 j 39 0.0315 0.0252 0.0063 f1 40 0.0225 0.0180 0.0045 41 0.0270 0.0216 0.0054 42 0.0225 0.0180 0.0045 43 0.0225 0.0180 0.0045 44 0.0225 0.0180 0.0045 45 0.0225 0.0180 0.0045 46 0.0180 0.0144 0.0036 47 0.0180 0.0144 0.0036 48 0.0180 0.0144 0.0036 TOTAL STORM RAINFALL(INCHES) = 4.50 TOTAL SOIL-LOSS(INCHES) = 2.58 TOTAL EFFECTIVE RAINFALL(INCHES) = 1.92 TOTAL SOIL -LOSS VOLUME(ACRE-FEET) = 16.0166 TOTAL STORM RUNOFF VOLUME(ACRE-FEET) = 11.8735 2 4- H O U R S T 0 R M R U N O F F H Y D R 0 G R A P H _ ^---v---HYDROGRAPH IN FIVE-MINUTE UNIT INTERVALS(CFS) (Note: Time indicated is at END of Each Unit Intervals) TIME(HRS) VOLUME(AF) Q(CFS) ------------- 0. 10.020.0 30.0 40.0 -_-'-_--__-- ____ _______- 0.083 0.0035 0.50 Q 0.167 0.0069 0.50 Q 0.250 0.0104 0.50 Q 0.333 0.0138 0.50 Q 0.417 0.0173 0.50 Q 0.500 0.0207 0.50 Q 0.583 0.0267 0.87 Q 0.667 0.0327 0.87 Q 0.750 0.0387 0.87 Q 0.833 0.0447 0.87 Q 0.917 0.0508 0.87 Q 1.000 0.0568 0.87 Q 1.083 0.0626 0.84 Q 1.167 0.0684 0.84 Q 1.250 0.0742 0.84 Q ( 1.333 0.0800 0.84 Q 1.417 0.0858 0.84 Q , 1.500 0.0916 0.84 Q 1.583 0.0978 0.91 Q 1.667 0.1041 0.91 Q i 1.750 0.1104 0.91 Q 1.833 0.1166 0.91 Q 1.917 0.1229 0.91 Q 2.000 0.1292 0.91 Q 2.063 0.1364 1.04 VQ , 2.167 0.1436 1.04 VQ 2.250 0.1507 1.04 VQ 2.333 0.1579 1.04 VQ 2.417 0.1651 1.04 VQ 2.500 0.1723 1.04 VQ 2.583 0.1811 1.28 VQ = 2.667 0.1899 1.28 VQ , 2.750 0.1988 1.28 VQ 2.833 0.2076 1.28 VQ 2.917 0.2164 1.28 VQ 3.000 0.2252 1.28 VQ , 3.083 0.2345 1.35 VQ , 3.167 0.2438 1.35 VQ I 3.250 0.2530 1.35 VQ 3.333 0.2623 1.35 VQ 3.417 0.2716 1.35 VQ 3.500 0.2809 1.35 VQ L_ 3.583 0.2909 1.45 VQ 3.667 0.3009 1.45 Q 3.750 0.3108 1.45 Q 3.833 L 0.3208 1.45 ` Q 3.917 0.3308 1.45 Q 4.000 0.3408 1.45 Q , L. 4.083 0.3524 1.68 Q 0.3640 1.68 Q 0.3756 1.68 Q 0.3872 1.68 Q 0.3988 1.68 Q 0.4104 1.68 Q 0.4238 1.95 .Q 0.4373 1.95 Q 0.4507 1.95 Q 0.4642 1.95 Q 0.4777 1.95 Q 0.4911 1.95 Q 0.5037 1.82 Q 0.5162 1.82 .Q 0.5288 1.82 Q 0.5413 1.82 .Q 0.5539 1.82 Q 0.5664 1.82 Q 0.5806 2.06 VQ 0.5947 2.06 Q 0.6089 2.06 Q 0.6230 2.06 Q 0.6372 2.06 Q 0.6513 2.06 Q 0.6676 2.36 Q 0.6838 2.36 Q 0.7001 2.36 Q 0.7163 2.36 Q 0.7326 2.36 Q 0.7488 2.36 Q 0.7669 2.63 Q 0.7850 2.63 Q 0.8031 2.63 Q 0.8212 2.63 Q 0.8393 2.63 Q 0.8574 2.63 Q 0.8767 2.80 Q 0.8959 2.80 QV 0.9152 2.80 QV 0.9345 2.80 QV 0.9537 2.80 QV 0.9730 2.80 QV 0.9953 3.23 Q 1.0175 3.23 Q 1.0398 3.23 Q 1.0621 3.23 Q 1.0843 3.23 Q 1.1066 3.23 Q 1.1333 3.87 Q 1.1600 3.87 Q 1.1866 3.87 Q 1.2133 3.87 QV 1.2400 3.87 QV 1.2666 3.87 QV 1.3009 4.97 Q 1.3351 4.97 Q 1.3693 4.97 Q 1.4035 4.97 Q 1.4377 4.97 Q 1.4720 4.97 Q 1.5315 8.65 V Q . 1.5911 8.65 V Q . 1.6506 8.65 V Q . 1.7102 8.65 V Q . 1.7697 8.65 V Q . 1.8293 8.65 V Q . 1.9129 12.15 V Q 1.9966 12,15 V Q 2.0803 12.15 V Q 2.1640 12,15 V Q 2.2477 12,15 V Q 2.3314 12,15 V Q 2.3781 6.79 Q V . 2.4249 6.79 Q V . 2.4717 6.79 Q V . 2.5185 6.79 Q V . 2.5653 6.79 Q V . - 2-.6121- .61212.6813 2 .6813 10.04 VQ 2.7504 10.04 VQ 2.8196 10.04 VQ „ 2.8887 10.04 VQ , 2.9579 10.04 VQ 3.0271 10.04 Q 3.1041 11.18 VQ 3.1811 11.18 VQ , 3.2581 11.18 VQ 3.3351 11.18 Q , 3.4121 11.18 Q , 3.4891 11.18 Q , 3.5564 9.78 Q.V 3.6237 9.78 Q. V 3.6911 9.78 Q. V , 3.7584 9.78 Q. V 3.8257 9.78 Q. V 3.8930 9.78 Q. V , 4.0150 17.70 V Q 4.1369 17.70 V Q 4.2588 17.70 V Q , 4.3807 17.70 V Q 4.5027 17.70 V Q 4.6246 17.70 V Q 4.7889 23.86 V Q 4.9533 23.86 V Q 5.1176 23.86 V Q 5.2819 23.86 V Q 5.4463 23.86 V Q 5.6106 23.86 V Q 5.8229 30.83 V. Q 6.0352 30.83 V Q 6.2475 30.83 V Q 6.4598 30.83 V Q 6.6721 30.83 V Q 6.8844 30.83 _ V Q 7.0366 22.10 QV 7.1888 22.10 Q V 7.3410 22.10 Q V 7.4933 22.10 Q V 7.6455 22.10 Q V 7.7977 22.10 Q V 7.9509 22.25 Q V 8.1042 22.25 Q V 8.2574 22.25 Q V 8.4107 22.25 Q V . 8.5639 22.25 Q V . 8.7172 22.25 Q V. 8.8742 22.80 Q V. 9.0312 22.80 Q V 9.1883 22.80 Q V 14.833 9.3453 22.80 Q V , 14.917 9,5023 22.80 Q V 15.000 9.6593 22.80 Q V 15.083 9.8027 20.81 Q V 15.167 9,9460 20.81 Q V 15.250 10.0893 20.81 Q V 15.333 10.2327 20.81 Q V 15.417 10,3760 20.81 Q v 15.500 10.5193 20.81 Q V 15.583 10,6293 15.97 Q V 15.667 10.7393 15.97 Q V 15.750 10.8492 15.97 Q V 15.833 10.9592 15.97 Q V 15.917 11.0692 15.97 Q V 16.000 11.1792 15.97 Q V 16.083 11.2105 4.56 Q V 16.167 11.2419 4.56 Q V 16.250 11.2733 4.56 Q V 16.333 11.3047 4.56 Q V . 16.417 11.3361 4.56 Q V . 16.500 11.3674 4.56 Q V . 16.583 11.3739 0.94 Q V . 16.667 11.3804 0.94 Q V . 16.750 11.3868 0.94 Q V . 16.833 11.3933 0.94 Q V . 16.917 11.3998 0.94 Q V . 17.000 11.4062 0.94 Q V . 17.083 11.4147 1.23 Q V . 17.167 11.4232 1.23 Q V . 17.250 11.4317 1.23 Q V . 17.333 11.4402 1.23 Q V , 17.417 11.4487 1.23 Q V . 17.500 11.4572 1.23 Q V . 17.583 11.4658 1.25 Q V . 17.667 11.4744 1.25 Q V . 17.750 11.4831 1.25 Q V . 17.833 11.4917 1.25 Q V . 17.917 11.5003 1.25 Q V . 18.000 11.5090 1.25 Q V . 18.083 11.5166 1.11 Q V . 18.167 11.5243 1.11 Q V . 18.250 11.5320 1.11 Q V . 18.333 11.5396 1.11 Q V . 18.417 11.5473 1.11 Q V . 18.500 11.5550 1.11 Q V . 18.583 11.5604 0.78 Q V . 18.667 11.5657 0.78 Q V . 18.750 11.5711 0.78 Q V . 18.833 11.5765 0.78 Q V . 18.917 11.5818 0.78 Q V. 19.000 11.5872 0.78 Q V. 19.083 11.5932 0.88 Q V. 19.167 11.5993 0.88 Q V. 19.250 11.6053 0.88 Q V. 19.333 11.6114 0.88 Q V. 19.417 11.6174 0.88 Q V. 19.500 11.6234 0.88 Q V. 19.583 11.6286 0.74 Q V. 19.667 11.6337 0.74 Q V. 19.750 11.6388 0.74 Q V. 19.833 11.6439 0.74 Q V. 19.917 11.6491 0.74 Q V. 20.000 11.6542 0.74 Q V. 20.083 11.6595 0.78 Q V. 20.167 11.6649 0.78 Q V. 20.250 11.6702 0.78 Q V. 20.333 11.6756 0.78 Q V. 20.417 11.6809 0.78 Q V. 20.500 11.6862 0,78 Q V. 20.583 11.6911 0.71 Q V. 20.667 11.6960 0.71 Q V. 20.750 11.7009 0.71 Q V. 20.833 11.7058 0.71 Q V. 20.917 11.7107 0.71 Q V. 21.000 11.7155 0.71 Q V. 21.083 11.7202 0.68 Q V. 21.1.67 -_. 11.7248 0.-68 Q V. 21.250 11.7295 0.68 Q V. 21.333 11.7341 0.68 Q V. 21.417 11.7388 0.68 Q V. 21.500 11.7434 0.68 Q V. 21.583 11.7481 0.67 Q V. 21.667 11.7527 0.67 Q V. 21.750 11.7574 0.67 Q f V. 21.833 11.7620 0.67 Q V. 21.917 11.7667 0.67 Q V. 22.000 11.7713 0.67 Q V. 22.083 11.7760 0.67 Q V. 22.167 11.7806 0.67 Q V. 11.7853 0.67 Q V. [22.250 22.333 11.7899 0.67 Q V. 22.417 11.7946 0.67 Q V. 22.500 11.7992 0.67 Q V. 22.583 11.8032 0.57 Q V. 22.667 11.8071 0.57 Q V. 22.750 11.8111 0.57 Q V. 22.833 11.8150 0.57 Q V. 22.917 11.8190 0.57 Q V. 23.000 11.8230 0.57 Q i V. 23.083 11.8267 0.54 Q V. 23.166 11.8304 0.54 Q V. 23.250 11.8341 0.54 Q V. f ` 23.333 11.8378 0.54 Q V. 23.47.6 11.8416 0.54 Q V. 23.500 11.8453 0.54 Q V. r 23.583 11.8490 0.54 Q V. 23.666 11.8527 0.54 Q V. 23.750 11.8564 0.54 Q V. 23.833 11.8602 0.54 Q V. 23.916 11.8639 0.54 Q . V. 24.000 11.8676 0.54 Q V. 24.083 11.8686 0.14 Q V. 11.8695 0.14 Q V. L24.166 24.250 11.8705 0.14 Q V. 24.333 11.8714 0.14 Q V. 24.416 11.8724 0.14 Q V. 24.500 11.8733 0.14 Q V. l 24.593 11.8734 0.00 Q V. 24.666 11.8734 0.00 Q V. 24.750 11.8734 0.00 Q V. 24.833 11.8734 0.00 Q V. 24.916 11.8734 0.00 Q V. 25.000 11.8734 0.00 Q V. --- END OF FLOODSCx ROUTING ANALYSIS LL O z 50TH AVENUE " rZ Sr�%`U7,% �,-- ��-- • c? , , ~ F !r' ` ifi { Q..i s^ t iJ J ,'t'.• r (;�+•'t+ .. -i3 511 '^ 1 r,.� ++. 4F vt � <( i a ate• �` �� r J. L} _ 01 ,ply d,�, ,�aaJ ,�, �., �� rt 4. d. rte. O ^e r0A 41 ��`•� ;iti{I 1 L / J� �. FS II v ! F 7 1 r i. ,�aI i Lo «r a5i �;--'". d. • AI [� �,�.�} 4 0:. 1�. •~ �,, V illi �' C`y `, iJ 'i'} 0 Gi O `'? '�.. .•rr,�� s� r�': �.+ 1r � d`. 4�ft. 'c' _.-.�} � Sr d. L�M�� + Fa � ��ry" �1 {� G J 0 `'^.•--.�..�1'"- � _r�nr � � €I fi; nlS �-'..� ! =.J �. ride 1[ � ., y. �• � ws i w Vr �,3 ,i, �� \ j r ':Y c7 �"k. (J '�`. j 5 Pt. dr r1�,/'I, f.4. 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() S3 � 3. i i /00 1" f "`',—�. -- �-^-- z, ' '( -ro o o lei 000 • 17 _AAi •• ., 0 6 0 {.,a v o<00-0 �•'^ _f; �� •,�, r`_"�,•-• � �t+1 _n. .r iCs .�..—_��--�'^`� r �• c? ,F, �~`"�..— rk "' �r�7 :� crr'=�? »_.._ � �� 3 ;jV=�i,•-.-_'•-- Jt+ Jr_ - r z. rsG tr -.73CXS �— 'Y v-�Cd.? • .6- { t La r ll' -9 c`•' -"r „-i P"--S-I � .- �"�.v�'{`�}�.�•�.,.--+�.o,--..,- r...�.-..a.�>,-+�_-•�'-x5-'�•---w� ..rh`,.�}",�R.1... _J `'��"�.'-. TL\ ^• 4 . .•��:-.-""�-.teto n -r F .. ,Y.,,. . , 0 100 200 400 800 PREPARED FOR: RST HOMES UNfT HYDROGRAPH ANALYSIS ►fr xs, LLC TENTATIVE TRACT No. 29858 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 CITY OF LA QUINTA FAX (760) 564-6505 I:/439-06/EXHIBITSIUNITLHYD 06/27/00 79-7" ow A-- xj . 1. Q, bft CA Ono DORICN vdm 969-151. 01 5 c x u 1 T z PAL965-251-0516 FLANPIERS ENGINEERS SURVEYORS PREPARED FOR: RST HOMES UNfT HYDROGRAPH ANALYSIS ►fr xs, LLC TENTATIVE TRACT No. 29858 50842 GRAND TRAVERSE LA QUINTA, CA 92253 PHONE (760) 564-6555 CITY OF LA QUINTA FAX (760) 564-6505 I:/439-06/EXHIBITSIUNITLHYD 06/27/00 ARCHAEOLOGICAL ASSESSMENT CULTURAL RESOURCE RESEARCH DESIGN FOR TESTING AND EVALUATION OF EIGHT ARCHAEOLOGICAL SITES IN THE CITY OF LA QUINTA, RIVERSIDE COUNTY, CALIFORNIA July 6, 2000 Prepared for: RJT Homes P.O. Box 810 La Quinta, CA 92253 Prepared by: Antonina Delu, Steven W. Conkling, and Philippe A. Lapin MA, RPA LSA Associates, Inc. 1 Park Plaza, Suite 500 Irvine, California 92614 (949) 553-0666 LSA Project #RJT030 LSA ASSOCIATES, INC. TABLE OF CONTENTS PAGE ABSTRACT..................................................................... v INTRODUCTION................................................................ 1 CRITERIA FOR EVALUATING SIGNIFICANCE ...................................... I SETTING....................................................................... 3 PROJECT DESCRIPTION ............................................ . . . 4 POTABLE WATER ........................................................ 6 CURRENT LAND USE ..................................................... 6 EXISTING KNOWLEDGE OF THE RESOURCES ........................ . ............ 6 PREVIOUS SURVEYS ..................................................... 7 SITE DESCRIPTIONS...................................................... 7 CULTURAL CONTEXT.......................................................... 11 ETHNOGRAPHY.......................................... . .............. 13 HISTORY............................................................... 14 THEORETICAL APPROACH ..................................................... 16 RESEARCH DOMAINS AND REGIONAL RESEARCH ISSUES ........... .. , , .. 16 METHODS FOR PREHISTORIC SITES AND COMPONENTS .......................... 19 GENERAL METHODS .................................................... 20 CA-RIV-6352............................................................ 21 CA-RIV-6353............................................................ 22 CA-RIV-6354............................................................ 22 CA-RIV-6355............................................................ 22 CA-RIV-6356............................................................ 22 CA-RIV-6357............................................................ 23 LSA-RJT030-S1.......................................................... 23 LABORATORY PROCESSING AND ANALYSIS ... . .......................... 23 REPORTING RESULTS ................................................... 24 KEYPERSONNEL.............................................................. 24 NATIVE AMERICAN CONSULTATION ............................................ 24 SUMMARY.................................................................... 25 REFERENCES.................................................................. 26 7/6/00((P:\RJT030\revised research design.wpdN ll LSAASSOCIATES, INC. LIST OF FIGURES PAGE 1 - Project Location and Vicinity ................................................. 2 2 - Archaeology Site Map ...................................................... 8 3 - Generalized Cultural Chronology and Southern California ......................... 12 7/6/00<<P:\RJT030\revised research design.wpd» iii LSAASSOCIATES. INC. LIST OF TABLES PAGE A - Fieldwork Program for RJT Homes, La Quints ..................................... 20 B - Work Plan for RJT Homes La Quinta Fieldwork .................................... 25 7/6/00((P:\RJT030\revised research design.wpd)) 1V LSAASSOCIATES. 1NC. ABSTRACT RJT Homes is proposing to develop approximately 80 acres within the northern half of the northeast quarter of Section 5, T6S ME, on the USGS La Quinta 7.5' quadrangle. The subject property is located on the southwestern corner of Jefferson Street and Avenue 50, in the City of La Quinta, in the County of Riverside, California. This document presents the Research Design/Test Plan developed to address known and newly discovered archaeological sites within the parcel. Seven prehistoric sites, CA-RIV-6352, CA-RIV-6353, CA-RIV-6354, CA-RIV-6355, CA-RIV-6356, CA-RIV-6357, and a newly discovered site with the temporary designation of LSA-RJT030-S 1, may be affected by the proposed development. The primary objectives of the site test program are 1) to evaluate the sites' significance/importance under both the California Environmental Quality Act (CEQA) and the City of La Quinta's Historic Preservation Ordinance; 2) to determine the sites' contents (features, artifacts, ecofacts) for the purpose of modifying the test hypotheses for further investigation if the sites are determined to be significant; and 3) to delineate the horizontal and vertical boundaries of the sites for purposes of project planning. CA-RIV-6352 contains prehistoric components. The site is located within a disturbed zone, overgrown with brush, and has been graded for citriculture. It was first recorded in 1999 by CRM TECH, as a 25m by 25m ceramic scatter consisting of three pottery fragments. The recent LSA survey relocated this site and identified a total of five ceramic fragments on the surface. CA-RIV-6353 is approximately 90m east/west by 70m north/south area. The site is located on what appears to be the remains of ancient Lake Cahuilla lake margin sediments, as evidenced by the widespread presence of lacustrine sediments and both freshwater mussel (Anadonta sp.) and freshwater snail (Physa succinea). The shape of the remaining deposit is an arbitrary result of grading and erosion. The surface artifacts include more than 50 ceramic fragments, one chert flake, more than seven pieces of fired clay, approximately 50 pieces of freshwater mussel, approximately 30 pieces of freshwater snail, and a 9m by 3m area containing a high density of bone and charcoal. The bone appears to be both large and small fish (some burned), cottontail, rodent, and bird. There is an absence of large mammal bone. CA-RIV-6354 was originally recorded by CRM TECH in 1999 as a small site located within a disturbed wash area. The site was described as four pottery fragments, one chert pressure flake, and one quartz flake in a 25m north/south by 13m east/west area. The recent LSA survey relocated this site. Four ceramic fragments were found; however, no lithics were relocated. CA-RIV-6355 is a moderate size site (93m cast/west by 23m north/south) located within a disturbed wash area. The majority of the site had been destroyed by recent weed abatement discing. One ceramic fragment and one piece of fire affected rock were found in what was the original site area. CA-RIV-6356 was originally recorded as "Orchard 4" by Drover in 1986, and was revisited by CRM TECH and designated as CA-RIV-6356. CA-RIV-6356 is approximately 24m north/south by 16m east/west. It is located on top and on the southeastern slope of a small dune surrounded by mesquite. CRM TECH suggests that CA-RIV-6356 qualifies as a historical resource due to the ability of the site 7WOMPAM030Uevised research designmpd)) v LSAASSOCIATES. INC. to answer research questions about prehistoric waddle and daub construction techniques. The extremely dense artifactual assemblage consists of more than 50 pieces of pottery (baked and burned), approximately 1,000 pieces of burned clay, an abundance of visible charcoal, and six pieces of fire affected rock. Bone located within the site boundaries is from cottontail (unburned and burned), woodrat, kangaroo rat, and lizard. Shell consisted of approximately 30 pieces of freshwater mussel and ten pieces of freshwater snail. There appears to be an historic constituent to the site, which includes several brown bottle fragments with opalized patination and a quantity of saw cut mesquite. CA-RIV-6357 was originally recorded as "Orchard 3" by Drover in 1986. In 1999, CRM TECH revisited "Orchard 3," and recorded it as CA-RIV-6357. The site encompasses the entire top of an artificially created small knoll. Disturbance, both on and surrounding the knoll, is heavy, as the area surrounding the landform has been graded and is eroding. The site is approximately 60m north/south by 40m east/west. Artifacts consist of 11 ceramic sherds, six pieces of burned clay, one tertiary basalt flake (1-2cm in size), six pieces of fire affected rock, and cottontail bone. LSA-RJT030-SI is a small (10m north/south by 2m east/west) site located on an extremely disturbed knoll. The site consists of five pieces of fired clay. Grading for the surrounding citriculture and dumping of imported soil, asphalt, and gravel have disturbed the site. It is expected that basic tasks will be completed within three months of the project start date (excluding time for SHPO review); however, should material be available for special analyses, such as radiocarbon dating, faunal analysis, obsidian analysis, and protein residue studies, additional time may be required. The technical report will include, for each site, a discussion of prehistoric site components, research results, and site boundaries. It will also provide a recommendation of site significance as outlined by CEQA and the City of La Quinta's Historic Preservation Ordinance. 7/6/00«P:\RJT030\revised research design.wpO vi LSAASSOCIATES, INC. INTRODUCTION The following Research Design/Test Plan has been prepared by LSA Associates, Inc. (LSA) for sites CA-RIV-6352, CA-RIV-6353, CA-RIV-6354, CA-RIV-6355, CA -RN -6356, CA-RIV-6357, and a newly discovered site with the temporary designation of LSA-RJT030-S 1, which may be affected by the proposed construction of a residential subdivision in the City of La Quinta. This document follows the general guidelines of the State Office of Historic Preservation (OHP), which state that a research design is necessary for an archaeological excavation (State Office of Historic Preservation 1991). The scope of a research design is variable, however, depending on a number of factors; the guidelines caution that "the goals of a study should be realistic given the state of existing knowledge about the resources and the data expected from the study" (State Office of Historic Preservation 1991:8). This research design incorporates several core elements that are recommended by the guidelines. This research design was prepared at the request of the City of La Quinta. The area of potential effects (APE) for this report consists of a 72 acre project area contained within the northern half of the northeast quarter of Section 5, T6S R7E, on the USGS La Quinta 7.5' quadrangle (Figure 1). The subject property is located on the southwestern corner of Jefferson Street and Avenue 50, in the City of La Quinta, in the County of Riverside. The primary objectives of the site test program are 1) to evaluate the sites' significance/importance under both the California Environmental Quality Act (CEQA) and the City of La Quinta's Historic Preservation Ordinance; 2) to determine the sites' contents (features, artifacts, ecofacts) for the purpose of modifying the test hypotheses for further investigation if the sites are determined to be significant; and 3) to delineate the horizontal and vertical boundaries of the sites for purposes of project planning. CRITERIA FOR EVALUATING SIGNIFICANCE Under CEQA, Section 15064.5 (as revised, 1998), an historical resource is considered significant if it meets the criteria for listing on the California Register of Historical Resources (Pub. Res. Code SS5024.1, Title 14 CCR, Section 4852). Historical resources include: (1) A resource listed in, or determined to be eligible by the State Historical Resources Commission for listing in, the California Register of Historic Resources; (2) A resource included in a local register of historic resources; (3) Any object, building, structure, site, area, place, record, or manuscript that a lead agency determines to be historically significant or significant in the architectural, engineering, scientific, economic, agricultural, educational, social, political, military, or cultural annals of California may be considered to be an historical resource, provided the lead agency's determination is supported by substantial evidence in light of the whole record. Eligibility for listing on the California Register of Historic Resources includes the following criteria: 7/6/00((P:\RJT030\revised research designmpd)) Riverside 71� am '61-" a San Bernardino C..'Y P2 .9 Traflw Path. b T;a" Riverside County k 7 PROJECTN4UC Palm LOCATION A-11 Springs scale in mil" No 10 20 33"pc � -7 4 % it PROJECTLOCATION .1 :a A A VCAILJ 0 iiiK#ba PI -4 .64** itu - a.!:- o. IFE M'4 - '-'. 40 M. .1, W, J. A - • L fL vo 4� m'Y *vZ 1. 0 4b f r V Oka - 1111111 ro "INV ...... rmmke+ f'4 4 1 491 t.N �'— r La Q11inta t k Source: USGS 7.5'Topo Quad. La Quinta, CA. rev 1980 6129100(RJT030ICulrural) LSA LSA Associates, Inc. mmm%..� 4`10 01 1,000- 2,000, N Figure I PJTHomes Project Location and Vicinity LSAASSOCIATES. INC.. A. Is associated with events that have made a significant contribution to the broad patterns of California's history and cultural heritage; B. Is associated with the lives of persons important in our past; C. Embodies the distinctive characteristics of a type, period, region, or method of construction, or represents the work of an important creative individual, or possesses high artistic values; or D. Has yielded, or may be likely to yield, information important in prehistory or history. A local register is a list of properties officially designated or recognized by a local government as being historically significant pursuant to a local ordinance or resolution [Pub. Res. Code SS5020.1(k)]. As the official local register, The Historic Preservation Ordinance of the City of La Quinta (under Title 7, La Quinta Municipal Code) allows for the establishment of an historic resources inventory. The historic resource inventory may include an historic resource based one or more of the following criteria: A. It exemplifies or reflects special elements of the city's cultural, social, economic, political, aesthetic, engineering or architectural history; or B. It is identified with persons or events significant in local, state or national history; or C. It embodies distinctive characteristics of a style, type, period or method of construction, is a valuable example of the use of the indigenous materials or craftsmanship or is representative of a notable work of an acclaimed builder, designer or architect; or D. It is an archaeological, paleontological, botanical, geological, topographical, ecological or geographical site which has the potential for yielding information of scientific value; or E. It is a geographically definable area possessing a concentration of sites, buildings, structures, improvements or objects linked historically through location, design, setting, materials, workmanship, feeling and/or association, in which the collective value of the improvements may be greater than the value of each individual improvement. (LQMC SS7.06.020) The seven archaeological sites within the project area are, therefore, evaluated under these statutory and regulatory guidelines for both the Historic Resource Inventory of the City of La Quinta and for the California Register. SETTING The project is located in the western portion of the Coachella Valley, with the foothills of the Santa Rosa Mountains situated 1.6 km to the southwest. Within this region, average temperatures range from a low of 38°F in January to a high of 106°F in July; the average annual temperature is 73'. The area has an average annual rainfall of three inches (Beck and Haase 1985:3-5), with the majority of precipitation occurring from January through April. Relative humidity averages about 38 percent. 7/6/000PARJT03ftevised research designmpd)) LSAASSOCIATES. INC PROJECT DESCRIPTION The APE encompasses approximately 72 acres and includes the entire area anticipated to be directly affected by the proposed residential development project. The project area has been disturbed by prior use of the property as a citrus grove and by the construction of structures associated with irrigation, as well as by the presence of several houses and their associated structures and objects. As the result of construction grading disturbances associated with the planting of the abandoned citrus grove, modern day elevations vary from 25 feet to approximately 50 feet above sea level. In prehistory, elevations on the project area would have ranged from 30 to 40 feet above sea level. The project location lies on the lake margin of ancient Lake Cahuilla, whose northern shore would have reached the modern 42 foot elevation contour line. Archaeological sites within the project area are most likely associated with the last high stand of ancient Lake Cahuilla, in approximately A.D. 1650. Geology The project area is located in the northwestern portion of the Colorado Desert province in the Coachella Valley. The Colorado Desert province is bounded on the north by the southern edge of the eastern Transverse Ranges, and by the Mojave Desert Province, which includes the Chocolate Mountains. On the east is the Colorado River, and on the southwest are the Peninsular Ranges (Norris and Webb, 1976). A major feature in the Colorado Desert province is the Salton Trough, a large 180 mile (290 km) structural depression that extends from the area around Palm Springs to the head of the Gulf of California. Movement along the San Andreas Fault from the Miocene to the present created the Salton Trough. During the Pleistocene and Holocene, the Salton Trough was filled with over 4,000 feet of sediment (Proctor, 1968). The term Salton Trough refers to the entire basin from San Gorgonio Pass to the Gulf of California; the term Salton Basin refers to the region that drains directly into the Salton Sea. The majority of the Colorado Desert lies at low elevations. The Colorado River Valley at the Riverside -San Bernardino County Line is at an elevation of 350 feet (107 m) above sea level; the elevation at Winterhaven in the southeast corner of the province is 130 feet (40 m) above sea level. The lowest elevation is the Salton Basin, which is divided into the Imperial Valley in the south and the Coachella Valley in the north. The Salton Sea is located in the central portion of the Basin, and has a surface elevation of -235 feet ( -72 m) below sea level. Lake Cahuilla is the name given to the freshwater lake that occupied the basin in the past. Evidence for this lake includes fossil gastropods, pelecypods, the remains of fish and other vertebrates, and travertine (tufa) deposits, which indicate high stands around the margin of the basin. Travertine deposits were secreted by algae growing below the waterline along the edge of Lake Cahuilla. Although the entire history of the lake is not known, it is likely that Lake Cahuilla filled on several occasions when the Colorado River was diverted from its present course to Gulf of California and ran northward into the Salton Basin (Norris and Webb, 1976, Waters, 1983). Between fillings of the lake, evaporation lowered the level of the lake, leaving a brine or a salty crust on the basin floor. Dates on tufa at Travertine Point (Turner and Reynolds, 1977) indicate an early filling of the lake at 7/6/00«P:\RJT030\revised research designmp& 4 LSA ASSOCIATES, INC. 9,000 years. In the late Holocene, the lake filled and evaporated at intervals. In the last 2,000 years, the lake filled around B.C. 100, A.D. 1000, and A.D. 1300. The latter lake had largely evaporated before Spanish exploration reached the lower Colorado in 1540 (Norris and Webb, 1976, Wilke, 1978). The formation of the Salton Sea in 1905 was the result of an agricultural accident. The sediments exposed on the APE can be described stratigraphically from the lowest and presumed oldest. These are massive greenish -gray Pleistocene silts and clays, exposed at low elevations on the parcel and deposited by a series of Pleistocene and early Holocene lakes with shore lines up to 47 feet (Wilke, 1978). These are overlain by Late Holocene lacustrine (lake) deposits that are micaceous, bedded, silty sands. As the sedimentary strata approach the 42 foot elevation, they reach the age of the last major stand of Lake Cahuilla between A.D. 1350 - 1550 (Wilke, 1978). Artificial topography was created on the APE prior to 1958 when higher and lower levels of citrus groves were developed with internal drainage that ran to a central sump. Since that time, aeolian sand has covered certain hills and leeward slopes, and silts have ponded on the parcel. Biology Endemic plant species, some of which were utilized by the Native Americans, are present in the project vicinity and may have been present within the project area prior to cultivation. Prehistorically, vegetation species present in the project area probably were types associated with the lake deposits of Lake Cahuilla, such as saltbush (Atriplex sp.) and creosote (Larrea tridentata). Mesquite (Prosopis glandulosa) also existed in the area. Prehistorically, mesquite was used extensively for food and shelter (Schroth 1988). The majority of the project area is disturbed with several exotic plant species such as tamarisk (Tamarix sp.) and date palm (Phoenix sp.), both found within abandoned citrus groves. Bean (1978:576) places the project area in the Lower Sonoran environmental zone, located between altitudes of -200 to 3,500 ft. According to Holland (1986), vegetation occurring along the alluvial fans found to the southwest of the project area falls basically within two biological communities, - Desert Dry Wash Woodland and Sonoran Creosote Bush Scrub. These two communities often inter- grade in many areas, and the boundary between them is indistinct. Desert Dry Wash Woodland is a riparian association, dominated by trees of the family Fabaceae, typically found along washes in the Colorado Desert. Desert Dry Wash Woodland species found in washes along the base of the hills to the east include smoketree (Psorothamnus spinosus), palo verde (Cercidium floridum), desert willow (Chilopsis linearis), catclaw acacia (Acacia greggii), and cheese - bush (Hymenoclea salsola). Sonoran Creosote Bush Scrub is the typical creosote bush scrub of the Colorado Desert and is typically found on well -drained soils of fans, slopes, and valleys. Sonoran Creosote Bush Scrub species found on the slopes east of the project area include creosote bush (Larrea tridentata), ragweed (Ambrosia dumosa), brittlebush (Encelia farinosa), indigo bush 7/6/OO((P:\RJT030\revised research designmpd)) LSAASSOCIAT$S. INC. (Psorothamnus emoryi), chuparosa (Justicia californica), and several species of cactus (Opuntia spp.)., Numerous fauna can be found within the project area. Reptile species include desert horned lizard, zebra -tailed lizard, desert iguana, western whiptail, chuckwalla, and sidewinder. Mammal species include Merriam's kangaroo rat, long-tailed pocket mouse, desert pocket mouse, antelope ground squirrel, Audubon cottontail, black -tailed jackrabbit, and coyote, with peninsular bighorn sheep observed in the Santa Rosa Mountains. Birds include Gambel's quail, mourning dove, greater roadrunner, lesser nighthawk, Anna's hummingbird, verdin, black -tailed gnatcatcher, cactus wren, Bewick's wren, phainopepla, and house finch. Many of these plants and animals were utilized by prehistoric occupants for food, basketry, or clothing. POTABLE WATER Potable water would have been seasonally present in the Whitewater River, approximately 2.6 km to the north of the project area. In addition, Bear Creek, 5 km south of the project area may have once been available at the foothills where man-made Lake Cahuilla is located today. Ancient Lake Cahuilla is known to have been a fresh water lake. CURRENT LAND USE The majority of the area within the parcel boundary has been disturbed by agricultural activities. The nearly rectangular area that constitutes the tentative tract section of the study area was occupied by a citrus orchard for approximately 25 years. Since then, the area has been abandoned. Several small areas associated with higher elevation points were left intact (that is, not graded for agriculture). The foundations of several houses still remain within the project area. EXISTING KNOWLEDGE OF THE RESOURCES Literature information and site records for recorded cultural resources within a one-quarter mile radius of the project area were obtained from the Eastern Information Center, Department of Anthropology, University of California, Riverside. The record search results indicate that 100 percent of the project area has been previously surveyed for cultural resources and that six prehistoric archaeological sites were identified and recorded within the project boundaries. Scientific names according to The Jepson Manual: Higher Plants of California, edited by James C. Hickman (1996). 7/6/00((PARJT030\revised research designmpd)) 6 LSAASSOCIATES. INC. PREVIOUS SURVEYS Two previous surveys have been conducted that encompassed the entire APE. Surveys were completed by Drover (1986) and by CRM TECH (1999). The APE was resurveyed by Antonina Delu, LSA Archaeologist, and Robert Reynolds, LSA Paleontologist, on June 19, 2000. The survey was conducted by walking a series of parallel transects across the project area. These transects were separated by approximately 10 to 15 meters, and continued until the APE was completely surveyed. Throughout the reconnaissance, any cultural resources that were encountered were documented with lists of artifacts in the assemblage and horizontal extent of the resource, mapped, and photographed. Subsequently, this information, along with the precise locations of the sites, was submitted to the Eastern Information Center, Department of Anthropology, University of California, Riverside, for assignment of an official State of California trinomial or Primary Number. Accuracy of a field survey is dependent on ground visibility. During a survey, ground visibility can vary from 0 to 100 percent, depending upon the amount of development and/or vegetation in the project area. For this survey, ground visibility ranged from 20 to 100 percent because of the presence of overgrown and abandoned agricultural groves, as well as areas of dense surface vegetation, both of which limit ground visibility. On average, 95 percent of the surface of the APE is disturbed. One new site, given the temporary resource name of LSA-RJT030-S1, was located during the survey, and a Primary Record and an Archaeological Site Record were completed for the resource. A Primary Record was completed for one isolate found within the APE. The six previously recorded sites, CA-RIV-6352, CA-RIV-6353, CA-RIV-6354, CA-RIV-6355, CA-RIV-6356, CA-RIV-6357, were relocated, additional information pertinent to the resource was collected, and their locations as mapped on the records search map were confirmed. SITE DESCRIPTIONS The project area contains seven sites (six previously recorded and one newly found site) and one isolate (Figure 2). The site forms along with sketch maps are attached in Appendix A. CA-RIV-6352 contains prehistoric components. The site is located within a disturbed zone, overgrown with brush, and has been graded for citrus agriculture. It was first recorded in 1999 by CRM TECH (site form; see Appendix A), as a 25m x 25m ceramic scatter consisting of three pottery fragments. The recent LSA survey relocated this site and found a total of five ceramic fragments on the surface. CA-RIV-6353 is located approximately 61m south of Avenue 50, and has been mapped as covering a 90m east/west by 45m north/south area. The site was originally recorded by CRM TECH in 1999 (site form; see Appendix A) as being located on a finger of a sand dune, within close range to a cluster of mesquite, just east of a modern building foundation and a water well, and within a disturbed zone that was graded for both the foundation and the citrus grove. The artifactual 7/6/00((P:\RJT030\revised research designmpd)) y yr•d �. L/� 2 t'" • 6M '61 .! r r� 1 Y`. '.•.,� •s.JtsG• t� - YfgfgeY ` rr\xy f n • •: N� aim M7.MR.a .rr j. h JJ a j i �i.. F 1•s ,fir,... ; ., .. ' !j_f$ilw -.NKk `G��,�, � `1+ •l iv mss. .� t� � �� '1 f j '•3f R�'.It. f aim A. i K"::. sar,� �ti � � Trailer Y,� AIk r' j caws..._ ,.». ... ar�w,, .�1 � d6 i.. •'� +� 't l ��aeldr. .tel ti` pr y,u. II IIE\� p rof:r tt 1 _,1 ` s •`: ! psi: Rr 1 ra p«z.n I... _ _`J ..,� 3 7. • ..i. ,. � 1 as -� t. f ' • ' �� {.f � � pS ka ::f GyV j v, ��,...a. . w" S^i . � f",+ . •«.s i r l� v' w r w �^Ij—` * ` � �j I . 1f �`�� , � ;�"�: �: r.r •� i - { � � r` 't � �'4 r, � , s .^.. 'ti•• NtIS *�.7�� IF 4i ^'V.:I'•.r.� „ t?} 5p' IVY 'ri. l? .F 1 : « r wan • a . n 3'.+'` :,�; •�..I •«• �� CA-RIV6353 CA-RIV-6356 "•$:f «•larb�� rtlK LSA-RJT 030-S1� ." UE Y.�:%,...:. x•aa•N a s a LSA-RJT030-11 ., ' CA-RIV 6352 r+•r �•. aaa r• :` 1Q JD' rv,`LRR�att•�e� Q a • Iaaeynr y�r`pl CA-RIV-6357 CA-RIV-6354 ,� ��Ivs i � r. prrY i �� 4► .sA .a\a %iarsup �'•<< :..,,.}:.•• r .µ.%«:. PROJECT�nt_ c '... s<. pAC '- CJ +'' �? r•;��. LOCATION ..:. l CA-RIV-6355 M too* IMi * C71 w•ni ..e... •"\a L'! O V ..V�• R FS h" R rR iixfF l�F•WAR' N IrtAa 4hf - •� ra -- - _a _ 3�iCtr .n%ar %.•r•rmYR �� ai. 'xozim& •Y ;w» `� .� . L�• r' l •.eri:i}iai46 �,i [[is e% (� sax Ra lye' ia. '•: Rrb}i«•RRrr� �� f"� o'rd%a•r4%4 ° as I I l dk am►► ,,,,,[[[[kkkkkklrt.Lr r� a %' v ......... a+p �• IYj, � '+ r:�iRy>!R Ybr• ae.e Ij� �.vu• ® ttd %f{ . •a � �+• zs.. a. x� V , ¢' rrErear •R• �](¢E +}E nyi axN 6. 4�a l®Y9 .� "w +a. rf•R\ %. xR }III Rv r{�Riir9Y}rR k'A>LNI ��i i r:: ' ` !•a• • � .O 4 rM r•trQ ��'1rRAi �lrw3}i� ',/ p• Yaarvr•s\ I. � .. o♦rxr.a •. rr�n der i.aa -/ryy s .., �yy. �+ �f.� M.. trCro9A� F xr!®«R«tl•Y '+•R. aE^�b� d rA. 1 :a A •a. abaJ• Aa> _. ,� I _ • �r7y;j...y',rJ+�';4+. is , s. -, i.'�A•\r Yrr m�11 'iRa�•e,ma.`�row�. � ,� �l �(: �1v4 Pr F••rr41• ,•y�,�� {ti�f�'Fx- � ( Y,� ' I. it �''. y � RlRr •Y�\r r•rma c> 'j -'V' �.Z i` � Yfl • a3 .lp�. krDP%}:Ypi« 'i Y:1 -V I 9. f 'r' p ii: rpnaM•apa n.• • '7 -rrL LLr r _ .'r � —_.x an. a so •. If M r - • . i*alYe a s. - ft Ai%E-NUE yQ- S aea •• :. � �rwa 5«aw• 1111 1J X �»«9IrY •r R%Rp; _.� .. •d9r j,«r �'�..,, :HHAB•ib walk}� O� s s Ia®sa rn PuSnp p IA Quint . ' k.' h`^ ' " r �' . n � s lk . y o °seal _ `.•. a is t �`: � '•�•xt� 1 �- as tk•aa er •c:".> 44H Source: USGS 7.5' Topo Quad. La Quinta, CA. rev 1980..; ``! t moi. "+ . ' `• 6129100(RIT0301Cultural) L S A LSAAssociates, Inc. 411 0r 1,000- 2,000r N Figure 2 RUT Homes Archeological Site Map LSA ASSOCIATES, INC. assemblage included 28 pieces of pottery, one flake of chert, fish bone (some with evidence of burning), pieces of fired clay (no count given), and several small shell fragments (Anadonta sp.). The site was relocated by the recent LSA survey. While the other disturbances were accurately recorded by CRM TECH, the site does not appear to be situated on a naturally occurring finger of a sand dune. Instead, the site is located on what appears to be the remains of ancient Lake Cahuilla lake margin sediments, as evidenced by the widespread presence of lacustrine sediments and both freshwater mussel (Anadonta sp.) and freshwater snail (Physa succinea). A series of telephone poles run across the site in an east/west direction, and their presence probably preserved the original topography of the surrounding area (see preceding geology discussion). The shape of the remaining deposit is therefore arbitrary and a result of grading and erosion. Surrounding areas to the north and east of the intact deposit have visible surface artifacts in low density, probably the result of grading disturbance. The artifact scatter as recorded by LSA consists of more than 50 ceramic fragments, one chert flake, more than seven pieces of fired clay, approximately 50 pieces of freshwater mussel, approximately 30 pieces of freshwater snail, and a 9m by 3m area containing a high density of bone and charcoal. The bone appears to be both large and small fish (some burned), cottontail, rodent, and bird. There is an absence of large mammal bone. Artifacts are recorded within a 90m east/west by 70m north/south area. CA-RIV-6354 was originally recorded by CRM TECH in 1999 (site form; see Appendix A) as a small site located within a disturbed wash area. The site was described as four pottery fragments, one chert pressure flake, and one quartz flake in a 25m north/south by 13m east/west area. The recent LSA survey relocated this site. Four ceramic fragments were found; however, no lithics were relocated. CA-RIV-6355 was originally recorded by CRM TECH in 1999 (site form; see Appendix A) as a moderately sized site (93m east/west by 23m north/south) located within a disturbed wash area. The site consisted exclusively of pottery fragments (n=9). The recent LSA survey relocated this site and found that the majority of the site had been destroyed by recent weed abatement discing. One ceramic fragment and one piece of fire affected rock were found in what was the original site area. CA-RIV-6356 was originally recorded as "Orchard 4" by Drover in 1986. He records the site as located atop a square dune, whose shape indicates the extensive grading in the area. Drover notes the presence of mesquite in the area. The artifacts consisted of two ceramic sherds and fragments of Anadonta sp., located on a flat, heavily disturbed surface. In 1999, CRM TECH revised the site description of CA-RIV-6356 and gave the dimensions as 24m north/south by 16m east/west. It is located on top and on the southeastern slope of a small dune surrounded by mesquite. The prehistoric components of the site were described as a small concentration of six pottery fragments, fired clay pieces, and one fire affected rock. CRM TECH notes that some of the pieces of burned clay have the impressions of sticks or poles, and as a result, 7/6/00<<P:\RJT030\revised research designmpd)> 9 LSAASSOCIATES. INC. they suggest that CA-RIV-6356 qualifies as an historical resource due to the ability of the site to answer research questions about prehistoric waddle and daub construction techniques. The recent LSA survey relocated CA-RIV-6356 and noted that the artifact density is higher than previously recorded. LSA agrees with the 1986 Drover assessment that the location is on the top of an artificially created square dune and that the site as recorded by CRM TECH in 1999 is surrounded by mesquite. The extremely dense artifactual assemblage consists of more than 50 pieces of pottery (baked and burned), approximately 1,000 pieces of burned clay, an abundance of charcoal visible on the surface, and six pieces of fire affected rock. Bone located within the site boundaries is from cottontail (unburned and burned), woodrat, kangaroo rat, and lizard. Shell consisted of approximately 30 pieces of freshwater mussel and ten pieces of freshwater snail. There appears to be an historic constituent to the site, which includes several brown bottle fragments with opalized patination and a quantity of saw cut mesquite. Modern disturbances on the site include 12 cans from the late 1960s, a green bottle fragment also from the late 1960s, and 13 plastic shotgun casings. Agricultural groves have disturbed the surrounding area. CA-RIV-6357 was originally recorded as "Orchard 3" by Drover in 1986. He records the site as located on a truncated sand dune. The artifacts recorded for the site consisted of one ceramic rim sherd, two fragmented pieces of granite, and freshwater mussel and freshwater snail. He noted that the shell was probably not culturally significant because it was widely distributed on the hill. Drover also mentions the disturbance of the site from citriculture. In 1999, CRM TECH revisited "Orchard 3," and recorded it as CA-RIV-6357 with dimensions of 57m north/south by 20m east/west. It is located on the top and eastern slope of a small dune with a moderate amount of low brush. The prehistoric components of the site consist of five pottery fragments. The recent LSA survey relocated CA-RIV-6357. The site encompasses the entire top of an artificially created small knoll. Disturbance, both on and surrounding the knoll, is heavy, as the area surrounding the land form has been graded and is eroding. The size of the site as recorded by LSA is approximately 60m north/south by 40m east/west. Vegetation on the site consists of dense salt scrub, and abandoned orchards surround the knoll. The on-site soil appears to be a deposit of ancient Lake Cahuilla margin sediments, as evidenced by the widespread presence of lacustrine sediments and both freshwater mussel (Anadonta sp.) and freshwater snail (Physa succinea). Artifacts consist of 11 ceramic sherds, six pieces of burned clay, one tertiary basalt flake (1-2cm in size), six pieces of fire affected rock, and cottontail bone. There is an area of ashy soil located in the middle of the site; however, there are no artifacts associated with the stain. LSA-RJT030-S1 is a small (I Om north/south by 2m east/west) site located on an extremely disturbed knoll, approximately 50 meters south of Avenue 50. The site consists of five pieces of fired clay. Disturbances are the result of grading for the surrounding citriculture, and dumping of imported soil, asphalt, and gravel. The on-site vegetation consists of moderate amounts of low-lying salt bush. On-site visibility averages approximately 90 percent. 7/6/00«P:\RJT030\revised research designmpd)) 10 LSAASSOCIATES, INC, CULTURAL CONTEXT Southern California researchers have divided regional prehistory into a four stage chronology describing changing artifact assemblages and evolving ecological adaptations. A principal chronology proposed by Wallace (1955) divides the area prehistory by major cultural changes within general prehistoric time periods. Wallace defined four cultural horizons for Southern California. These horizons are discussed below (Figure 3). The Early Horizon covers the period from the first presence of humans in Southern California until post -glacial times. Artifacts and cultural activities from this time period represent a predominantly hunting culture (Wallace 1955). The presence of extremely large, often fluted, bifaces marks the Early Horizon (Moratto 1984:81). Large unnotched bifaces are associated with use of the spear. The Early Horizon is followed in time by the Milling Stone Horizon. Milling Stone Horizon sites (post -5500 B.C.) typically contain ground stone artifacts, such as manos, metates, cogged stones, and soapstone objects. Manos are handstones used in conjunction with larger metates to grind meal. Cogged stones are hand sized stones ground into a thick disk with cogs or gear -like notches on the outer edge. Wallace suggests that the cultures of the Milling Stone Horizon were generally hunter -gatherers who spent much time collecting and processing plants. When bifaces are associated with Milling Stone Horizon sites, they are commonly large and notched and are associated with the use of the atlatl (spear -thrower). Approximately 3000 B.C., coastal populations began greater reliance on marine resources. The remains of nearshore and deep sea fish appear more often in site refuse. There was an increased use of the mortar and pestle, which marked a technological change in the manner in which seeds were processed. Instead of using just the mano and metate for smaller seeds, larger seeds with high oil content (acorns, screwbeans, pine nuts) were utilized, and it is possible that use of the mortar and pestle indicates a diversification in seed collecting strategy. The occurrence of the mortar and pestle marks Wallace's Intermediate Horizon. Additional artifacts found predominantly within the Intermediate Horizon include discoidals and crescentics. Discoidals are similar to cogged stones, much like a thin section of a clydinder, although with a smooth circumference. Crescentics are crescentically shaped, bifacially flaked tools. Bifaces remain large and notched for use with the atlad, but are replaced by small points for the bow and arrow by the end of the Intermediate Horizon. The Late Prehistoric Horizon begins approximately A.D. 500. At this time, artifact changes or new cultural practices occur. Smaller projectile points, representing bow and arrow use in hunting, are present. This period is also marked by steatite effigies, as well as by cremation as an interment practice. These artifacts and practices have been linked to a proposed Shoshonean (Takic) immigration that ended at the coast. By A.D. 1000, smoking pipes and ceramic pottery appear, although ceramic smoking pipes may appear somewhat earlier. Such artifacts surface sporadically. Therefore, site dating also depends on other factors, such as the increased frequency of Salton Sea (Obsidian Buttes) obsidian, used inconsistently until after circa A.D. 1000. 7/6/00((P:\JUT030\revised research designmpd)) 11 700 A.D. 5500 A.D. 6/19100(R1T0301Culluwt) LSA LSA Associates, Inc. Historic Period DATE 1769 A.D. Influx of Tiaon ,Brown ware pottery 1000 A.D. Late Prehistoric Period Small arrow points, increased use of steatite. Interments by cremation. 500 A.D. ----------------------------------- OA.D. Intermediate Period Mortar and pestle, discoidals, crescentics. Increasing use ,of marine resources. Somewhat smaller bifaces. Mortar and pestle. Interment by burial. -3000 A.D. Milling Stone Period Manos, metates, cogged stones and steatite objects. Large bifaces. Interment by burial. 6000 A.D. Early Period Large b faces (some fluted, atlatl. Dependency on big game hunting. Figure 3 PJT Homes Generalized Cultural Chronology of Southern Cali orma LSAASSOCIATES, INC. The westernmost portion of the Colorado Desert east of the San Gorgonio Pass is known as the Coachella Valley, a name possibly derived from the Spanish work "conchilla," meaning little shell (Santa Fe Federal Savings and Loan Association 1977). Freshwater shells litter the surface of the Salton Basin and indicate the existence of prehistoric Lake Cahuilla (Wilke 1978). The Late Prehistoric Horizon of the Coachella Valley area did not end as abruptly as it did along the California coast, when Franciscan friars and Spanish soldiers began establishing mission outposts. Wilke (1978) has presented an exhaustive study of the Cahuilla Indians. He believes that the oral tradition of the historic Cahuilla is "... sufficiently detailed that it seems highly probable the aboriginal occupants of the Lake Cahuilla shore in the Coachella Valley at least 450 ... (to) ... 1000 years ago were ancestral to the historic Cahuilla" (Wilke 1978:127). ETHNOGRAPHY The first clearly documented contact with natives of the Coachella Valley occurred in 1823-1824 with the Estudillo-Romero expedition into the Colorado Desert, during an attempt to locate a route from the Colorado River to the coast that would avoid the hostile Yuman Indians (Bean and Mason 1962; Davis and Bouscaren 1980:9). Government surveys were undertaken in 1852-1853 to establish a baseline in the San Gorgonio Pass, establishing the first wagon road into Coachella Valley (Davis and Bouscaren 1980:9). Also in 1853, a survey party for a southern railroad route included geologist William Blake, who named the Colorado Desert and Lake Cahuilla and who recorded detailed information concerning the local natives and environment. A stagecoach line was in service by the 1860s, and the railroad opened between Los Angeles and Indio in 1876 (Gunther 1984:250). At the time of the first European expeditions through the area, the region of Coachella Valley was inhabited by natives referred to as the Cahuilla, meaning master or boss. The term may have derived from the Cahuilla language (Kroeber 1925:693; Bean 1978:575). "The earliest records of the Cahuilla show them broken ... into a multitude of small village groups, established wherever water and food were available" (James 1960:37). The Cahuilla occupied most of the area from the summit of the San Bernardino Mountains in the north to Borrego Springs and the Chocolate Mountains in the south, a portion of the Colorado Desert west of Orocopia Mountain to the east, and the San Jacinto Plain near Riverside and the eastern slopes of Palomar Mountain to the west [Bean 1978:575]. The Cahuilla are generally divided into three groups: Desert Cahuilla, Mountain Cahuilla, and Western (or Pass) Cahuilla. The term Western Cahuilla is preferred over Pass Cahuilla because this group is not confined to the San Gorgonio Pass area (James 1960:37). The distinctions are believed to be primarily geographic, although linguistic and cultural differences may have existed to varying degrees (Strong 1929). Artifacts common to the Cahuilla include coiled pottery (often incised and painted), baskets, manos, metates, mortars, pestles, steatite arrow shaft straighteners, mesquite or willow bows and arrows, wooden throwing sticks, charm stones, bull-roarers, and small bifacially worked stone points 7/6/00((P:\RJT030\revised research designmpd)) 13 LSAASSOCIATES. INC. (Kroeber 1925: 695-704; Bean 1978:579). Marine shells, including Olivella sp. beads, were used for money and are often associated with cremations (Davis and Bouscaren 1980:8). Cahuilla subsistence was based primarily on acorns, honey mesquite, screw beans, pinon nuts, and cactus bulbs, supplemented by a variety of wild fruits and berries, tubers, roots, and greens (Kroeber 1925:694-696; Barrows 1965; Bean 1972, 1978). Agricultural use of corn, beans, squash, and melons has also been attributed to the Cahuilla (Lawton and Bean 1968; Bean 1978:578). A list of Cahuilla plant foods is provided by Barrows (1965:242), who undertook fieldwork prior to 1900. Hunting of deer, rabbit, antelope, bighorn sheep, reptiles, small rodents, quail, doves, ducks, and reptiles using bows, throwing sticks, traps, and communal drives is documented (James 1960:58; Bean 1978:576; Wilke 1978). Deep walk-in wells are characteristic of the Western Cahuilla, and the name of the town of Indian Wells is derived from these wells (James 1960:48; Santa Fe Federal Savings and Loan Association 1977). A local native legend maintains that the place of the first palm tree, from which all other palms originated, was "... about one and a half miles west of the point of Indian Wells (Point Happy), which the Indians named Cov in ish, meaning a low or hollow place" (Patencio 1943:101). James (1960:38-39) illustrates two Western (Pass) Cahuilla village sites located in the vicinity of the project area, but not within the project area. One of the village sites is at Indian Wells and another is located in Deep Canyon. Additional Cahuilla village sites are depicted in Bean (1978:576). HISTORY The Coachella Valley The Coachella Valley was settled by European pioneers in the late 1800s. The valley was originally designated as being in San Diego County, and was later changed to Riverside County in 1893. The origin of the name Coachella is attributed to two different sources. The most common account states that "Coachella" is a misspelling of the word conchilla, a Spanish word meaning "little shells." Conchilla refers to the small shells found throughout the valley as remnants of the Holocene Era Lake Cahuilla. A cartographer is credited with writing the name incorrectly on a 1901 map (Shields 1957). Another source states that the name Coachella resulted from an intentional decision made by several members of the community in 1901. The terms Cahuilla, the tribal name of the local band of Native Americans, and concha, a Spanish word for the small shells found in abundance in the valley, were combined to form the new name: Coachella (Laflin 1998). La Quinta The City of La Quinta is located in the western Coachella Valley. According to the Riverside County Place Names, La Quinta is Spanish for `country house or villa' (Gunther 1984). La Quinta also means `fifth' in Spanish, referring to the area location as the fifth stopping place along the overland 7/6/00«P:\RJT030\revised research designmpd» 14 LSAASSOCIATES, INC. trail traveled by de Anza in 1774 (Gunther 1984). After four strenuous days of travel, La Quinta provided water and rest for the de Anza group. The travelers relaxed for one day with music, dancing, and games. Thereafter, the area became a widely publicized and popular spot for travelers (Cooper 1976). The area known as La Quinta is said to be named after the La Quinta Hotel, constructed in 1926 by Walter H. Morgan, a wealthy man from San Francisco (Byron 1893). The history of La Quinta, located within the Coachella Valley, includes the native Cahuilla and their resources. The most essential of these resources was the availability of water. The Cahuilla not only knew of the locations of all local watering holes, caches, and natural reservoirs, but were known for their ability to excavate wells. If not for these resources, the European settlers would not have been attracted to the area. The Cahuilla wells were first reported by an American surveyor during the Pacific Railroad exploration in 1853 (Gunther 1984). With the aid of basic instruments, the Cahuilla people dug some of the deepest wells found in the United States; many wells measured as deep as 30-40 feet below the desert surface. One well was located north of the Point Happy Ranch, on the western side of the point, known today as Indian Wells. Another was situated south on the Torres Indian Reservation. Until flooding collapsed the wells in 1916, the wells provided water for the Cahuilla, as well as travelers (La Quinta Historical Society 1990; Coachella Valley County Water District 1968). The Bradshaw Trail was the first road in the Coachella Valley (La Quints Historical Society 1990; Dodge and Burbeck 1889). In 1861, William David Bradshaw was contracted to find a safer route for the new stagecoach line from California to the gold fields of La Paz, Arizona. Bradshaw utilized an Indian trail that started at Toro Spring, passed through the Salton Sink, the Chocolate Mountains, the summit at Tabassca Tank, down to Ehrenberg on the Colorado River, and into La Paz (La Quinta Historical Society 1990). This trail was used from 1862-1877. Individuals traveling this route eventually settled the area and developed it into the single largest source of date palms worldwide (Shields 1957). Settlement by European pioneers in the late 1800s began with the advent of the railroad system. In 1872, the Southern Pacific Railroad survey began, with a route planned to connect Texas with Los Angeles (Admiral 1937). In 1876, the route was completed, following the Bradshaw Trail. The Homestead Act of 1862 The Homestead Act of 1862 proclaimed land as `public domain' to settlers who would improve and homestead the land with their families. Each person was allowed to claim up to 160 acres of public land for a nominal fee of $10, provided that improvements to the land were made after the legal claim was filed with the county land assessor's office. Improvements, such as building a house and cultivating or grazing the land, in addition to the claimant residing on the land for a minimum of five years, were in keeping with the conditions set forth by the Act Many early settlers claimed land and then later abandoned that claim for another parcel of land. A pre-emption claim could also be issued to those settlers on unappropriated public land, by way of utilizing the Pre-emption Act of September 4, 184 1. Under this act, a single adult over the legal age of 21, the head of a family, or a widow could settle on land and make improvements before filing a Declaration of Intent with the local land office. 7/6/000PAM03ftevised research designmpd)) 15 LSAASSOCIATES, INC. This allowed the person filing to later purchase the land at a minimum price without competition. This act was repealed in 1891 at repeated requests of the Commissioner of the General Land Office based on abuse of the law and fraudulent entries (McHenry 1998). In addition to the Homestead Act, several other types of land claims were available for settlers in the Coachella Valley. This included Desert Land Entries, Cash Entries, Reclamation Homestead Entries, State Grants, Railroad Grants, and properties acquired using the Indemnity List (Mouriquand 1997). The government allotted several sections of land to be used for building railroads and later sold the unused land for $1.25 per acre (Robinson 1948). Farming in the Coachella Valley Date groves became an integral part of the Coachella Valley in late 19' or early 201 century occupation. The U.S. Department of Agriculture first brought dates to the Indio area in 1890. The majority of the date trees introduced at that time were of an inferior quality and, thus, produced inferior crops. It was not until 1903, when Bernard Johnson brought date offshoots from Algeria, that the date industry began to succeed in the United States. Johnson introduced the Deglet Noor variety of dates and soon captured the market in the United States. In 1913, the Coachella Valley Date Grower's Association was organized and was devoted exclusively to the promotion of dates. By 1967, the Deglet Noor variety took the lead in the commercial production of dates, with more than three-quarters of the 4,000 acres in Coachella Valley planted with this variety of date. A total of 119 varieties of date palm and 33 varieties of citrus established the valley as one of the wealthiest agricultural resources in the world (Shields 1957). THEORETICAL APPROACH A statement of theoretical approach is one of the core elements of the OHP's Guidelines, and will be addressed here (State Office of Historic Preservation 1991). The research questions proposed below are developed from the perspective of cultural ecology, which views human societies in their interactive relationships with their natural and cultural environments. The changing adaptations of human groups to their environments are reflected in the archaeological record. The view of cultural ecology, coupled with environmental reconstruction, allows for cultures of societies dependent on natural resources to be viewed holistically with changes viewed as adaptations to changing environmental conditions. RESEARCHDOMAINSAND REGIONAL RESEARCHISSUES In addition to features such as rock rings, fire hearths, living floors, and rock art, two classes of culturally related material are used to formulate research questions: artifacts and ecofacts. Artifacts are tools, ornaments, and objects modified by humans to fulfill some role in the society such as food preparation, adornment, food procurement, etc. Ecofacts are the discarded trash from food preparation and include plant (flora) and animal (fauna) remains. The study of these materials provides data that can be used to answer research questions concerning prehistoric lifestyles. 7/6/00OPMUT030Uevised research designmpd)) 16 LSAASSOCIATES. INC. Prehistoric Chronology 1. When were the sites occupied? 2. What was the overall range of occupation? Are there identifiable periods of abandonment? 4. Are specific cultural sequences represented? How do the site chronologies relate to other sites near the study area? Hypotheses The sites were occupied during the Late Prehistoric period (ca. post-A.D. 500). 2. The chronology of this site is similar to other sites in the region. Data Requirements There are several methods of employing recovered archaeological remains to identify a time or period of occupation for a prehistoric site. Organic material can be radiocarbon dated; obsidian can be measured for its hydration absorption; and diagnostic artifact types can be associated with artifacts from other, previously dated sites. Prehistoric Ecology Model The ecological model views a settlement pattern as the balance that has been achieved between prehistoric people and their environment. This model proposes that a given population makes optimal use of the resources at its disposal, while minimizing the amount of energy expended in obtaining the resources. If changes occurred in the interaction among humans, their culture, or their environment, the balance would have shifted; therefore, archaeological data must be studied in a manner that can detect these shifts. 1. Is there evidence that the sites were used year-round? What does the ethnographic record suggest about food processing sites? 2. Do the archaeological subsistence data give any evidence concerning the annual duration of site occupation? What environmental advantages account for the location of the sites (i.e., did the locations provide convenient access to primary subsistence resources)? 7/6/00((P:\RJT030\revised research designmpd)) 17 LSAASSOCIATES. INC. 4. What ecozones are represented in the faunal remains from the site? Based on a synthesis of regional site data, is there a discernable pattern of site placement within the geographical setting characteristic of this type of site (i.e., are there environmental determinants for the location of this site)? Hypotheses The sites were occupied on a seasonal basis. 2. The site locations were selected for occupation because they were located in an area physiographically and/or environmentally advantageous over other locations in the vicinity. 3. The sites were occupied during climatic conditions similar to those of the present. Data Requirements The question of seasonality may be answered, to an extent, by factors related to growth of individuals as recorded on certain ecofact elements. The joints of immature animals are less heavily ossified than those of mature individuals. Analysis of growth rings on trees is a well-known indicator of seasonali- ty, and it has been proposed that similar growth rings occur in marine shellfish. Pollen and seeds may also indicate the season in which distinct flora was collected at a particular site, since flora contain specific periods of flowering and seeding and usually occur only under certain climatic conditions. The presence of distinct plant types may also indicate that the site location was chosen for reasons associated with those resources present at the site. Prehistoric Subsistence/Settlement Patterns The theoretical assumption is that the sites represent limited seasonal food procurement and possible food processing. It is hypothesized that the sites served as limited activity areas associated with seasonal subsistence procurement. Subsistence patterns will be reflected by ecofacts and artifacts. Bone, ceramics, and milling elements have been recorded. Given the limited surface scatter of artifacts, it is predicted that substantial evidence of prehistoric subsistence may not be present at the sites. If evidence is discovered, research into the following questions will be implemented: What was the subsistence focus? 2. Do the subsistence patterns vary over time? 3. Is there evidence for seasonal variation in subsistence focus? 4. Can variations in subsistence be correlated to environmental determinants? 7WOOKPAM030Vevised research designmpd)) 18 LSAASSOCIATES, INC, What flora were processed at the sites? 6. What does the artifact assemblage suggest about subsistence patterns? 7. What do fauna indicate about prehistoric diet? Did the prehistoric diet change over time? 8. What is the local resource base in terms of raw lithic material, flora and fauna? What are the critical resources present, and which resources are absent? Hypotheses Specific flora and fauna were exploited at the sites. 2. Seasonal subsistence patterns are present at the sites. Data Requirements Seasonality studies of the flora and fauna may identify the season of site occupation or utilization. Depending on the soil chemistry, pollen samples may or may not have endured. If the soil is too alkaline, pollen may no longer be present. Under ideal conditions, plant remains may be represented by pollen, phytoliths, carbonized seeds, and charcoal. These will be present only if a subsurface cultural deposit is found. The presence of valued lithic and ecofact remains may provide clues as to why the site was chosen over other nearby locales. METHODS FOR PREHISTORIC SITES AND COMPONENTS The proposed investigation is designed 1) to delineate the horizontal and vertical boundary of each site; 2) to identify the content of each site; and 3) to evaluate the significance and integrity of each site. As part of the significance evaluation, the investigation will assess the potential of each site to address the research questions discussed in the research design. A test investigation is not designed to answer the posted questions, although this may occur, but rather to determine whether more in-depth investigations will yield sufficient information to address and answer the research questions. The fieldwork plan and sampling strategies for each site are outlined below. Some field methods apply to all sites and are discussed under general methods. The field methods are summarized in Table A, and the site area tabulated below is based on the most recent survey conducted by LSA in June, 2000. Site locations in respect to the APE are shown in Figure 2. 7/6/00((P:\RJT030\revised research designmpd)) 19 LSAASSOCIATES. INC. Table A - Fieldwork Program for RJT Homes, La Quinta GENERAL METHODS For surface collections, the sites and area around the sites will be systematically traversed with all artifacts flagged using surveyors' flags. This task will also include collecting the isolated artifacts not associated directly with the sites. All artifacts will be numbered, mapped by point provenience, and collected by shot number for laboratory processing and analysis. In addition, concentrations of fire altered rock (possible hearth features) or other nonartifactual cultural constituents will be flagged and mapped by provenience, but not collected. Two sites, CA-RIV-6353 and CA-RIV-6356, will have surface collection of diagnostic artifacts only. A map will be generated for all sites showing the surface distribution and concentration(s) of surface material and will be used to determine the areas with the highest potential for subsurface deposits. All sites within the APE will have shovel test pits (STPs) excavated. The purpose of STPs is to determine whether 1) a subsurface deposit is present, and 2) the horizontal and vertical extent of the deposit. STPs will be aligned along true north/south and east/west axes through the site area. For sites with topographic variation, the STPs will be topographically placed in intervals crossing the site. STPs will be approximately 35 cm in diameter and excavated by 20 cm levels to sterile soil, bedrock, or 100 cm, whichever is appropriate. Excavated soil will be screened through one-eighth inch screen mesh, and appropriate field notes will be maintained. All cultural material retained in the screen will be bagged by provenience and returned to the laboratory for processing and analysis. STPs will be backfilled upon completion. Based on the results of the STPs, a positive STP will further require one lm by lm test unit to be placed in the area of greatest potential for subsurface deposits and will be excavated to determine the extent, integrity, and content of the subsurface deposit. If the STP is positive, but the cultural material appears in soil that originates from the first 10 cm of depth below the surface, two shovel scrapes will be intuitively placed on the site. If the STPs for any given site are negative, two shovel scrapes (see description below) will be intuitively placed to verify the negative findings of the STPs. An estimated time for job tasks is listed below for each site. Since a projection cannot be made as to whether STPs will be negative or positive for the presence of cultural material, for budgeting purposes we will assume that STPs for each site will be positive and, therefore, will require the placement of one test unit. 7/6/000PARH030Vevised research design.wp& 20 Site Area Number of Number of Surface Trenchin Site in sq m STPs 1x1 -m units Collection g CA-RIV-6352 750 11 1 Yes Yes CA-RIV-6353 6,300 16 4 Yes Yes CA-RIV-6354 325 8 1 Yes Yes CA-RIV-6355 2,139 11 1 Yes Yes CA-RIV-6356 384 8 4 Yes Yes CA-RIV-6357 2,400 10 1 Yes Yes LSA-RJT030-S1 20 3 1 Yes Yes Total 12,318 67 13 7 7 GENERAL METHODS For surface collections, the sites and area around the sites will be systematically traversed with all artifacts flagged using surveyors' flags. This task will also include collecting the isolated artifacts not associated directly with the sites. All artifacts will be numbered, mapped by point provenience, and collected by shot number for laboratory processing and analysis. In addition, concentrations of fire altered rock (possible hearth features) or other nonartifactual cultural constituents will be flagged and mapped by provenience, but not collected. Two sites, CA-RIV-6353 and CA-RIV-6356, will have surface collection of diagnostic artifacts only. A map will be generated for all sites showing the surface distribution and concentration(s) of surface material and will be used to determine the areas with the highest potential for subsurface deposits. All sites within the APE will have shovel test pits (STPs) excavated. The purpose of STPs is to determine whether 1) a subsurface deposit is present, and 2) the horizontal and vertical extent of the deposit. STPs will be aligned along true north/south and east/west axes through the site area. For sites with topographic variation, the STPs will be topographically placed in intervals crossing the site. STPs will be approximately 35 cm in diameter and excavated by 20 cm levels to sterile soil, bedrock, or 100 cm, whichever is appropriate. Excavated soil will be screened through one-eighth inch screen mesh, and appropriate field notes will be maintained. All cultural material retained in the screen will be bagged by provenience and returned to the laboratory for processing and analysis. STPs will be backfilled upon completion. Based on the results of the STPs, a positive STP will further require one lm by lm test unit to be placed in the area of greatest potential for subsurface deposits and will be excavated to determine the extent, integrity, and content of the subsurface deposit. If the STP is positive, but the cultural material appears in soil that originates from the first 10 cm of depth below the surface, two shovel scrapes will be intuitively placed on the site. If the STPs for any given site are negative, two shovel scrapes (see description below) will be intuitively placed to verify the negative findings of the STPs. An estimated time for job tasks is listed below for each site. Since a projection cannot be made as to whether STPs will be negative or positive for the presence of cultural material, for budgeting purposes we will assume that STPs for each site will be positive and, therefore, will require the placement of one test unit. 7/6/000PARH030Vevised research design.wp& 20 LSAASSOCIATES. INC. Test units will be placed as discussed below for individual sites. The lm by lm units will be hand excavated in 10 cm contour levels to sterile soil or bedrock. Excavated soil will be screened through one-eighth inch screen mesh. Cultural material retained in the screen will be bagged with appropriate provenience and returned to the laboratory for processing and analysis. Field notes will be maintained describing soil, context, and field observations. At least one side wall from each unit will be profiled and photographed, and small (3x3x3 cm) soil samples will be taken from each soil horizon. In addition, at each site, one 10cm by 10cm column of soil, excavated in 10 cm levels, will be saved. This will ensure that a site soil sample is preserved in the event that the site is determined to be not significant. The soil samples are necessary for control when submitting samples for protein residue analysis. If features are encountered, they will be completely uncovered, pedestaled, mapped, and photographed. Soil samples for macrobotanical analysis will be retrieved at appropriate locations within the features. After encountering sterile soil, an STP will be excavated in the bottom of each unit to ensure that no buried deposits are present under the sterile soil. Two shovel scrapes will be intuitively placed to verify the negative findings of the STPs in a wider contiguous area. Surface scrapes are 2m by 2m on the surface and are excavated to a depth of 10 cm. Excavated soil will be screened through one-eighth screen mesh. Cultural material retained in the screen will be bagged with appropriate provenience and returned to the laboratory for processing and analysis. Field notes will be maintained describing soil, context, and field observations. If it appears that the deposit extends below 10 cm, an STP will be excavated in one corner of the unit. If the STP indicates that a substantial subsurface deposit may be present below the 10 cm level, a lm by lm unit will be established in the center of the surface scrape and excavated to sterile soil or bedrock. All sites within the APE will have trenches excavated by a mechanical backhoe. Trenches will be excavated to assure that buried cultural deposits, including possible inhumations, are adequately mitigated during project development. An archaeological monitor will be present at all times during trenching activities. If previously undiscovered archaeological remains are uncovered during the trenching process, the trenching monitor will notify RJT Homes and the City of La Quinta. A mitigation plan will be developed to reduce impacts to a less than significant level. CA-RIV-6352 This site consists of 750 sq in. Testing of this site will consist of 11 STPs placed on an axis that crosses the site from north to south and east to west in 5m intervals. Based on the negative or positive results of the STPs, either a test unit or two surface scrapes will be placed on the site to verify the negative or positive findings. All surface artifacts will be collected from the site. Lastly, there will be trenching on the site. Estimated time for Surface Collection: I person day Estimated time for 11 STPs: 4.5 person days Estimated time for I Test Unit: 3.5 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day 7/6/00((PAM030\revised research design.wpdN 21 LSAASSOCIATES. INC. CA-RIV-6353 Because site CA-RIV-6353 contains a large quantity of ceramics, fired clay, and shell in combination with a 9m by 3m locus containing high densities of bone and charcoal, it may represent a habitation area and, therefore, has the greatest potential for the discovery of in situ hearths. Hearths often contain material that can be used to determine the age of the occupation (i.e., charcoal or charcoal - rich soil for radiocarbon dates). The test for this site will include 16 STPs placed in 10m intervals along the topography of the site, four lm by lm units, as well as a surface collection of diagnostic artifacts. Estimated time for surface collection: 2 person days Estimated time for 16 STPs: 6.5 person days Estimated time for 4 Test Units: 14 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day CA-RIV-6354 The test of the site CA-RIV-6354 will consist of eight STPs placed on an axis that crosses the site from north to south and east to west in 5m intervals. Depending on the negative or positive result of the STPs, either two surface scrapes will be intuitively placed on the site or a test unit will be excavated. A surface collection of the site will be made. Estimated time for Surface Collection: I person day Estimated time for 8 STPs: 3 person days Estimated time for 1 Test Unit: 3.5 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day CA -RW --6355 Site CA-RIV-6355 will be tested with 11 STPs placed on an axis that crosses the site from north to south and east to west in 5m intervals. Depending on the negative or positive result of the STPs, either two surface scrapes will be intuitively placed on the site or a test unit will be excavated. A surface collection of the site will be made. Estimated time for Surface Collection: 1 person days Estimated time for 11 STPs: 4.5 person days Estimated time for I Test Unit. 3.5 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day CA-RIV-6356 Because site CA-RIV-6356 contains a large quantity of ceramics, fired clay, and shell in combination with high densities of charcoal, it may represent a habitation area and, therefore, has the greatest 7/6/000PARH03ftevised research designmp& 22 LSAASSOCIATES, INC. potential for the discovery of in situ hearths. Hearths often contain material that can be used to determine the age of the occupation (i.e., charcoal or charcoal -rich soil for radiocarbon dates). The test for this site will include eight STPs placed in 5m intervals along the topography of the site, four lm by lm units, as well as a surface collection of diagnostic artifacts. Estimated lime for surface collection: 2 person days Estimated time for 8 STPs: 3 person days Estimated time for 4 Test Units: 14 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day CA-RIV-6357 Site CA-RIV-6357 will be tested with ten STPs placed on an axis that crosses the site from north to south and east to west in 5m intervals. Depending on the negative or positive result of the STPs, either two surface scrapes will be intuitively placed on the site or a test unit will be excavated. A surface collection of the site will be made. Estimated time for Surface Collection: I person day Estimated time for 10 STPs: 4 person days Estimated time for 1 Test Unit: 3.5 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day LSA-RJT030-S1 Site LSA-RJT030-S1 will be tested with four STPs placed on an axis that crosses the site from north to south and east to west in 5m intervals. Depending on the negative or positive result of the STPs, either two surface scrapes will be intuitively placed on the site or a test unit will be excavated. A surface collection of the site will be made. Estimated time for Surface Collection: 1 person day Estimated time for 4 STPs: L S person days Estimated time for 1 Test Unit: 3.5 person days Estimated time for Trenching (Operator & Monitor): 0.28 person day LABORATOR YPROCESSING AND ANALYSIS In the laboratory, the cultural material will be processed using standard archaeological procedures. Artifacts will be washed and catalogued with the exception of artifacts that have the potential to yield surface residue material. Artifacts deemed important for special analysis will be catalogued and treated to protect potential surface residue. The artifacts will be analyzed using a functional approach in order to determine the probable range of activities that took place at the sites and the potential for further investigation to expand and quantify 7/6/00«P:\RH030\revised research designmp& 23 LSAASSOCIATES. INC. the conclusions. Morphological attributes of importance to regional prehistory will be discussed, and technological strategies will be inferred, based on the limits of the assemblages. Special analyses are dependent upon the recovery of material suitable for investigation. Such material will be processed and analyzed if recovered. Special analyses include 1) faunal analysis if bone is recovered; 2) obsidian sourcing and hydration measurements if obsidian is recovered; 3) radiocarbon dates on charcoal from features or on shell from the deposit; 4) geomorphological analysis; and 5) protein residue analyses on surfaces of artifacts found in subsurface excavations. Estimated time for Cataloguing and Analysis (excluding special analysis) 80 person days REPORTING RESULTS A technical report describing the work conducted and the results of the analyses will be prepared. It will include detailed project maps and any drawings of diagnostic artifacts. The report will focus on the recovered material and the potential for the sites to further our knowledge about the prehistory of the region. The significance of the sites in accordance to the criteria set forth by the California Register of Historical Resources (CEQA, Appendix K) and the National Register of Historic Places (NEPA) will be evaluated, and recommendations will be made based on the results of the test investigations. As necessary, site forms will be updated and submitted to the regional information center. Additional copies of the draft report(s) will be provided for California State Office of Historic Preservation review. The report authors will be available to respond to questions and comments from the State Office of Historic Preservation, and the final report(s) will be revised as necessary to meet federal guidelines. Estimated time for site form preparation, report writing, finalizing maps, and report processing 40 person days KEY PERSONNEL The project will be directed by Ivan Strudwick, MA, RPA, Philippe Lapin, MA, RPA, Deborah McLean, and Antonina Delu. Mr. Strudwick will act as the Principal Investigator. The remaining personnel, supplemented by other technical specialists, will co-author the final report. Resumes of pertinent personnel are provided in Appendix B. NATIVE AMERICAN CONSULTATION If human remains are encountered, State Health and Safety Code Section 7050.5 states that no further disturbance shall occur until the County Coroner has made a determination of origin and disposition pursuant to Public Resources Code Section 5097.98. The County Coroner must be notified of the find immediately. If the remains are determined to be prehistoric, the Coroner will notify the Native American Heritage Commission (NAHC), which will determine and notify a Most Likely Descendent 7/6/00((P:WT030\revised research designmpd)) 24 LSA ASSOCIATES. INC. (MLD). With the permission of the landowner or his/her authorized representative, the MLD may inspect the site of the discovery. The MLD shall complete the inspection within 24 hours of notification by the NAHC. The MLD may recommend scientific removal and nondestructive analysis of human remains and items associated with Native American burials. SUMMARY The test plan presented herein follows the guidelines set forth by the State Office of Historic Preservation (1991). The primary purpose is to determine the scope and significance of sites CA-RIV-6352, CA-RIV-6353, CA-RIV-6354, CA-RIV-6355, CA-RIV-6356, CA-RIV-6357, and a newly discovered site with the temporary designation of LSA-RJT030-S 1 in terms of the regional prehistory and history of Southern California. The work plan for this research is summarized in Table B. Table B - Work Plan for RJT Homes La Quinta Fieldwork Person Days Site Area Surface Site in sq m STPs 1x1 -m units Collection Trenching CA-RIV-6352 750 4 3.5 1 0.28 CA-RIV-6353 6,300 6.5 14 2 0.28 CA-RIV-6354 325 3 3.5 1 0.28 CA-RIV-6355 2,139 4.5 3.5 1 0.28 CA-RIV-6356 384 3 14 2 0.28 CA-RIV-6357 2,400 4 3.5 1 0.28 LSA-RJT030-S1 20 1.5 3.5 1 0.28 Total 12,318 27 46 9 2 It is expected that basic tasks will be completed within three months of the project start date (excluding time for SHPO review); however, should material be available for special analyses, such as radiocarbon dating, faunal analysis, obsidian analysis, and protein residue studies, additional time may be necessary. The technical report will include, for each site, a discussion of prehistoric site components, research results, and site boundaries. It will also provide a recommendation of site significance as outlined by CEQA and the City of La Quinta's Historic Preservation Ordinance. 7/6/00((P:\RJT030\revised research design.wpd>i 25 LSA ASSOCIATES. INC. REFERENCES Admiral, Don 1937 Desert of the Palms. La Quinta Historical Society, 1993, originally published by The Desert Magazine, El Centro, California. Barrows, David P. 1965 Desert Plant Foods of the Coahuilla. In: The California Indians: A Source Book, R. F. Heizer and M. A. Whipple, eds., pp. 242-250. University of California Press, Berkeley and Los Angeles. (Originally published in 1900 as The Ethno-Botany of the Coahuilla Indians of Southern California.) Bean, Lowell John 1972 Mukat's People: The Cahuilla Indians of Southern California. University of California Press, Berkeley and Los Angeles. 1978 Cahuilla. In: Handbook of North American Indians, Vol. 8, California, R.F. Heizer, ed., pp. 575-587. Smithsonian Institution, Washington, D.C. Bean, Lowell J., and William M. Mason 1962 Diaries and Accounts of the Romero Expeditions in Arizona and California, 1823-1826. W. Ritchie Press, Los Angeles. Beck, Warren A., and Ynez D. Haase 1985 Historical Atlas of California. University of Oklahoma Press, Norman, Oklahoma. Bynon, A. A., and Son 1893 History and Directory of Riverside County, 1893-4. Reprinted 1992, Historical Commission Press, Riverside, California. California Environmental Equality Act (CEQA) 1999 Archaeological Impacts. Coachella Valley Municipal Water District 1968 Coachella Valleys Golden Years. Desert Printing Co., Inc., Indio, California Cooper, Madge 1976 La Quinta, within Heritage Tales of Coachella Valley. Committee of Members of American Association of University Women, Palm Springs Branch, Palm Springs, California. CRM TECH, Bruce Love, and Bai "Tom" Tang 1999 Historical/Archaeological Resources Report, Promus Vacation Resort, Jefferson Street and Avenue 50, City of La Quinta, Riverside County, California. On file at the Eastern Information Center, University of California, Riverside, California. MF 2214. 7/6/00«PAM030\revised research design.wpd)) 26 LSAASSOCIATES. INC. Davis, Alan, and Steve Bouscaren 1980 Environmental Impact Evaluation: An Archaeological Assessment of an Unnumbered Tract of the West Side of Indio, Riverside County, California. Archaeological Research Unit, UC Riverside. Ms. on file, Eastern Information Center, University of California, Riverside, California. Dodge and Burbeck 1889 Map of San Diego County, California. Drover, Christopher 1986 Environmental Impact Evaluation: An Archaeological Assessment of the Proposed Orchard Hotel Complex, La Quinta, Riverside County, California. On file at the Eastern Information Center, University of California, Riverside, California. MF 2214. Gunther, Jane Davies 1984 Riverside County, California, Place Names: Their Origins and Stories. Rubidoux Printing Co., Riverside, California. Hickman, James C., Editor 1996 The Jepson Manual: Higher Plants of California. Third printing. University of California press, Berkeley and Los Angeles, California Holland, Robert F. 1986 Preliminary Descriptions of the Terrestrial Habitats of California. State of California, the Resources Agency, Department of Fish and Game. James, Harry C. 1960 The Cahuilla Indians: The Men Called Master. Westernlore Press, Los Angeles, California.. (Reprinted: Malki Museum Press, Banning, Calif., 1985). Kroeber, Albert L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin 78. Washington, D. C. La Quinta Historical Society 1990 The History of La Quinta, The Gem of the Desert. La Quinta Historical Society, La Quinta, California. Laflin, Patricia B. 1998 Coachella Valley California, A Pictorial History. The Donning Company Publishers, Virginia Beach, Virginia. Lawton, Harry W., and Lowell J. Bean 1968 A Preliminary Reconstruction of Aboriginal Agricultural Technology among the Cahuilla. The Indian Historian 1(5):18-24, 29. McHenry, Petei 1998 The History of Valley Center, California: The Homestead Years, 1860-1900. GP Marketing, Escondido, California. 7/6/00((PARJT030\revised research designmpd)) 27 LSAASSOCIATES, INC. Moratto, Michael 1984 California Archaeology. San Diego: Academic Press. Mouriquand, Leslie 1997 Draft: City of La Quinta: Historic Context Statement. Report prepared for the La Quinta Historic Preservation Commission. Norris, Robert M., and Robert W. Webb 1976 Geology of California. John Wiley & Sons, Inc., Santa Barbara. Patencio, Francisco 1943 Stories and Legends of the Palm Springs Indians. As told by Chief F. Patencio to Margaret Boynton. Times Mirror, Los Angeles, California. Proctor, R. J. 1968 Geology of the Desert Hot Springs Upper Coachella Valley Area, California. California Division of Mines and Geology, Special Report 94. Robinson, W. W. 1948 Land in California. University of California Press, Los Angeles. Santa Fe Federal Savings and Loan Association 1977 Guideposts to History: People and Places of Historical Significance in Early San Bernardino and Riverside Counties. San Bernardino Valley Edition. Published by the Santa Fe Federal Savings and Loan Assoc. Shields Date Gardens 1957 Coachella Valley Desert Trails — The Salton Sea Saga and The Romance and Sex Life of the Date. Shields Date Gardens, Indio, California State Office of Historic Preservation (SOHP) 1991 Guidelines for Archaeological Research Designs. Preservation Planning Bulletin No. 5. Department of Parks and Recreation, Office of Historic Preservation, Sacramento. Strong, William D. 1929 Aboriginal Society in Southern California. Archaeology and Ethnology 26(1):1-358. University of California Publications in American Turner, W. G. and R. E. Reynolds, 1977 Dating the Salton Sea petroglyphs. Science News, 111 (February). Wallace, William J 1955 A Suggested Chronology for Southern California Coastal Archaeology. Southwestern Journal of Anthropology 11:214-230. Waters, M. R. 1983 Late Holocene Lacustrine Chronology and Archaeology of Ancient Lake Cahuilla, California. Quaternary Research, Vol. 19, No. 3, May 1983, pp 373 - 387 7/6/00«P:\RH030\revised research design.wpO 28 LSAASSOCIATES. INC. Wilke, Phillip J. 1978 Late Prehistoric Human Ecology at Lake Cahuilla, Coachella Valley, California. University of California Archaeological Research Facility Contributions No. 38. 7/6/00«PAM03ftevised research design.wpd» 29 State of California --The Resources Agency DEPARTMENT OF PARKS AND RECREATION PRIMARY RECORD Page 1 of 4 P1. Other Identifier: Primary # 33-9008 HRI # Trinomial CA-RI'y-631'!2 _ _ NRHP Status Code 7 Other Listings Review Code Reviewer *Resource Name or #: (Assigned by recorder) CRM TECH 429-1 *P2. Location: 4 Not for Publication Unrestricted *a. County Riverside and (P2b and Plc or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad La Ouint;a, Calif. Date 1959, nhotorevised 1980 T6 S; R7 E; NW 1/4 of NW 1/4 of NE 1/4 of Sec 5 ; S. B. B.M. Elevation: Ca. 45 ft c. Address N/A City Zip d. UTM: (Give more than one for large and/or linear resources) Zone 11; 567 . 120 mE/ 3, 727 , 23 0 mN UTM Derivation: q USGS Quad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Located ca. 200 ft h qf Avenue * P 3 a . Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) The site consists _ of one locus defined by a small disturbed nowover-grown with moderate amount of low brush. *133b. Resource Attributes: (List attributes and codes) AP3-ceramic scatter *P4. Resources Present: Building Structure Object _4Site District Element of District —Isolate—Other FP 5 a . Photograph or Drawing (Photograph required for buildings, structures, and objects.) P 5 b . Description of Photo: (view, date, accession #) *P6. Date Constructed/Age and Sources: Historic 4 Prehistoric Both *P7. Owner and Address: Promus Vacation Resorts, 755 Crossover Lane, Memphis, TN 38177-4900 *P8. Recorded by: (Name, affiliation, and address) - Nc-Lt_a_s_ha_Johnsc,n and Dargy Wigw_a1J,Dar TECH, 2411 Sunset Drive, Riverside, CA 92506 *P9. Date Recorded: Aucrust 13, 1999 *P10. Survey Type: (Describe) Intensive *P11. Report Citation (Cite survey report and other sources, or enter "none."): Bruce Love and Bai "Tom" T,anci (1999): Historical/Archaeological Resources Revort: Promus Vacatio Reggrt. JeffJeffersQn 9tregt andv nu f La Ouinta, Riverside C California. Quf'1 Information Qenter,rnia RiveKg de, *Attach ments:_None 4 Location Map Sketch Map—Continuation Sheet—Building, Structure, and Object Record 4 Archaeological Record—District Record—Linear Resource Record—Milling Station Record Rock Art Record _Artifact Record—Photograph Record_Other (List). DPR 523A (1/95) *Required information [DEPARTMENT ate of California --The Resources Agency Primary #3 3-9008 OF PARKS AND RECREATION Trinomial CA-RIV-6352 ;ARCHAEOLOGICAL SITE RECORD Page -!-of 4 *Resource Name or # (Assigned by recorder) CRM TECH 429-1 Al. Dimensions: a. Length Ca, 25 M (N -S) b. Width Ca. 25 m ( } Method of Measurement:-�-Paced Taped Visual estimate +other: Method of Determination (Check any that apply.): Artifacts —Features—Soil Vegetation _Topography_Cut bank_Animal burrow—Excavation—Property boundary _Other (Explain): Reliability of Determination: High Medium J Low Explain: 1jighly disturbed Limitations (Check any that apply): —Restricted access_Paved/built over—Site limits incompletely defined 4 Disturbances 4 Vegetation Other (Explain): -Disturbed by current itrus rove an covered with moderately dense brush A2. Depth: None 4 Unknown Method of Determination: *A3. Human Remains:_Present_Absent _Possible 4 Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) None *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.) TY e site consists o oris lacus defined by am711 concent rats on of hr n bave beened -for a g,itrus amount of low brush - *A6. Were Specimens Collected? 4 No Yes (If yes, attach Artifact Record or catalog and identify where specimens are curated.) *A7. Site Condition: Good Fair 4 Poor (Describe disturbances.): See Item Al . *A8. Nearest Water (Type, distance, and direction.): Wh` tewater Riv r ca. 1. miles to the north - *A9. Elevation: 9,a. 45 ft above Gee 1Pv�1 Al 0. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): Introduced s rub us weeds, ipal r t t rmer i t grove._ he soil is com osed of dune sazzd formincr a rise t7ossikrly man made Cir graded with a slight Slone to the east A11. Historical Information: N/A *Al2. Age: 4 Prehistoric 4 Protohistoric 4 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945_ Undetermined Describe position in regional prehistoric chronology or factual historic dates if known: PrQb!ably s fated with the last high stand o£ ancient Lake Qahuilla. ga, AD 1650 A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know) A probable Desert Cahuilla site, minimal, data _Doten ial A14. Remarks: TesLincr Ly reporLem 2111 A15. References: (Documents, informants, maps, and other references.): See Item P11 A16. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: rRI�CH 24] 1 Sunset Drive Riverside CA 92506 *A17. Form Prepared by: Darcy Wiewall and Bai "Tom" Tana Date: Sept. 1. 1229 Affiliation and Address:, CRM TECH 2411 Sunset Drive Riverside CA 92 6 DPR 523C (1/95) *Required information 7 State of California --The Resources Agency Primary # 33-9008 DEPARTMENT OF PARKS AND RECREATION HRI # LOCATION MAP- Trinomial CA -Ritz -6352_ Page_3_of 4 *Resource Name or # (Assigned by recorder) CRM TECH 429-1 *Map Name: La OUinta ra I i f, *Scale: 1:24,QQO *Date of Map: 1959, -photorevised 1980 Trailer Park 4.... — ` If.:.s I.., Trailer P�ik t4 rL Well 6 n r Wel It 33 $2 -WEN 9 $Well I it Water V CA-RIV-i"353 CA-RIV- 356 -e A4v IV -0 -RIV-6352 CA-RIV-6357 k-RIV-6354 _��_�CA-RIV-63551 project boundary _..;d F SCALE 1:24,000 0 1/2 1 mile 1000 0 1000 2000 3000 4000 feet DPR 523J (1/95) J" AXW U. ' .. ..... . ...... *Required information State of California --The Resources Agency Primary # 33-9008 DEPARTMENT OF PARKS AND RECREATION HRI# SKETCH MAP Trinomial CA RIV-5352 Page _A,_of 4 *Resource Name or # (Assigned by recorder) QRM T H 429-1 *Drawn by: Darcy Wiewall *Date: September 1. 1999 i4Z 6 41,4 I.. X42 , -dot- x,, 4 w x. i S ger h X� a"' 1 site':. b.. boundary X X 4& 6' �. ►.r 411.4 s Sherd 0 15 30M r` DPR 523K (1/95) *Required information State of California --The Resources Agency Primary # V3-909 DEPARTMENT OF PARKS AND RECREATION HRI# PRIMARY RECORD Trinomial CA-RIV-6353 NRHP Status Code 7 _ Other Listings Review Code Reviewer Date Page 1 of 4 *Resource Name or #: (Assigned by recorder) CRM TECH—A2_9-2 P 1 . Other Identifier: *P2. Location: _4Not for Publication Unrestricted *a. County Riverside and (P2b and P2c or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad La Ouinta Calif. Date 1959. ohotorevised 1980 T6 S ; R7 E ; NW 1/4 of NW 1/4 of NE 1/4 of Sec 5 ; S.B. B.M. Elevation: C3 45 c. Address N/A City Zip d. UTM: (Give more than one for large and/or linear resources) Zone 11; 567,200 mEI._3 .727 .200 mN UTM Derivation: 4 USGS Quad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Located ca. 200 ft: golth of Ave ue 5 and ca 1/2 mile west of Jefferso Street *P3 a . Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) The sit!Q consist -s- of !2ne WOMMARICOUS IL v R, c_otcentration of 28 pottery fragments: gne flake -of chert: fish bone. gjgmg�_with evidenc-e-ot burning; j2ieces Qf fired clay: sqnd sevgu:92 small shell fragments. pggraibl Anadonta sp. The si�e lies on a_finaerof a dune with a small stal3d o mesg,Uite Just - r ■ a mdern buildiricT foundqioa,within disturbed •!- which 2 ar- o. R r_. been a. ■ ■ for the foundation and citrus ■ *P3b. Resource Attributes: (List attributes and codes) .1ZIC *Attachments:_None 4 Location Map 4 Sketch Map—Continuation Sheet—Building, Structure, and Object Record 4 Archaeological Record—District Record—Linear Resource Record—Milling Station Record—Rock Art Record _Artifact Record_Photograph Record_Other (List): DPR 523A (1/95) *Required information A -other (fired clay,bQne, shell) *P4. Resources Present: Building Structure Object 4 Site District Element of District tsolate_Other P5a Photograph or Drawing (Photograph required for buildings, structures, and objects.)_ 135b. Description of Photo: (view, date, accession #) * P 6. Date Constructed/Age and Sources: Historic-4—prehistoric Both *P7. Owner and Address Promus yacation Resorts, 755 CroSgigyer Lane, Memphis, TN 38177-4900 *P8. Recorded by: (Name, affiliation, and address) Natasha Johnson nd Darcy Wiewall, CR TECH, 2411 Sunset Dr've, Riverside, CA 92506 *P9. Date Recorded: August 13, 1999 *P10. Survey Type: (Describe) intensive *P11. Report Citation (Cite survey report and other sources, or enter "none."): Bnuca Lo " " Tan 9 Historical Archaeolo ical Resources R ort: us a n R o tre and v n e 0 C't L uinta Riv C CalifornjA On fi e Eastern Information Centex university of California Pi vArRI CSP- OF I'; ,1 1999 .1ZIC *Attachments:_None 4 Location Map 4 Sketch Map—Continuation Sheet—Building, Structure, and Object Record 4 Archaeological Record—District Record—Linear Resource Record—Milling Station Record—Rock Art Record _Artifact Record_Photograph Record_Other (List): DPR 523A (1/95) *Required information State of California --The Resources Agency Primary #"3�-2009 DEPARTMENT OF PARKS AND RECREATION Trinomial -6353 ARCHAEOLOGICAL SITE RECORD Page 2 of 4 *Resource Name or # (Assigned by recorder) CRM TECH 429-2 Al. Dimensions: a. Length Ca. 90 m (E -W) b. Width__ Ca, 45 m (N-sj Method of Measurement: q Paced Taped Visual estimate Other: Method of Determination (Check any that apply.): q Artifacts Features Soil Vegetation _Topography_Cut bank—Animal burrow—Excavation—Property boundary _Other (Explain): Reliability of Determination: High 4 Medium Low Explain:_ S �. tE i orated on,�. fin cre= Qf a dune wd t -h little evidence of disturbance _ Limitations (Check any that apply): _Restricted access q Paved/built over_Site limits incompletely defined 4 Disturbances Vegetation Other (Explain): A r ion m istru e adjacent sYrAten well and modern building foundation, A2. Depth: None 4 Unknown Method of Determination: - *A3. Human Remains:—Present—Absent—Possible � Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) None *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.) The site consists of one lacus definer, �by a cg_rt entration of 28 pgttery fragments,c fish bone.evidence-f carni ces of n e ral small shell n s Anadonta ;Zg The site lies on a finger of a dune with aosmall stand of mesauite just east of a Ovate*- well and a modern building foundation within a dist=urbed zone, which appears to have been graded for the foundation and a citrus rove. *A6. Were Specimens Collected? 4 specimens are curatod_) *A7. Site Condition: Good 4 Fair No Yes (If yes, attach Artifact Record or catalog and identify where Poor (Describe disturbances.):_ See Item Al *A8. Nearest Water (Type, distance, and direction.): whitewat or Rives; ca 1,5 miles to the *A9. Elevation: Ca. 45 ft above sea level A10. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): Lo-Qat•ed on a finger of a sand dune with a small cluster of mesquite within h and r' h a.nd_citrus trees. All. Historical Information: N/A *A112. Age: q Prehistoric q Protohistoric 4 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945_ Undetermined Describe position in regional prehistoric chronology or factual historic dates if known: Probably associated with the last ,high stand of ancient Lake Cahuill_a, ca. AD 1650 A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know) A nrobable Desert Cahuilla site moderate data potential A14. Remarks: Testing recommended in survey report (see Idem P11.) A 1 5. References: (Documents, informants, maps, and other references.): See Item P11. Al 6. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: CRM TECH 2411 Sunset give _Riverside CA 92506 *A17. Form Prepared by: Darcy WiegNall. Tang -Date:., Sept. 1 1929 Affiliation and Address: CRM TECH. 2911 Sunset Drive. Rve irside CA 92506 DPR 523C (1/95) *Required information _ State of California --The Resources Agency Primary # 33-9009 DEPARTMENT OF PARKS AND RECREATION HRI # LOCATION MAP Trinomial CA-RTV-6353 Page__.L-of 4 *Resource Name or # (Assigned by recorder)— CRM TECH 4a.2 -.L__ °K0op Nome *Scale: *Date ofMap: 1959, ghotorevised 198Q Trailer r Trailer ilrk Wei 41 NVE 12 Ir ri CA -R IV -6353 \_JCA -R1 356 50 52 / 354 ?D CA-RIV-6355 project [boundary well SCALE 1-24,000 1000 0 1000 20DO 3000 4000 feet DPR 523J (1/95) *Required information Mate of California --The Resources Agency Primary # 33-9009 „ )EPARTMENT OF PARKS AND RECREATION HRI # 'KETCH MAP Trinomial CA-Rxv-6353 Page —of 4 'Resource Name or a (Assignea by recorder) CRM TECH 429-2 *Drawn by: Darcy Wie 11 *Date: September 1, 1999 ® Datum point • o Debitage j • Sherd F-+ 0 is 30 m `rk S ^� x �i p y X DPR 523K (1/95) *Required information X M X� �. ' r w, • X ; Site boundary r� `' y x + 41 «pw� „r' Charcoal and fish+" bone scatter DPR 523K (1/95) *Required information State of California --The Resources Agency DEPARTMENT OF PARKS AND RECREATION PRIMARY RECORD Other Listing Review Code, Primary # 33-9010 _ HRI # Trinomial CA-RIV-6354 NRHP Status Code 7 Reviewer Page 1 of 4 *Resource Name or ;F: tHssignea oy recoraer) crtcn Ez(-t_ P 1 . Other Identifier: *P2. Location: 4 Not for Publication Unrestricted *a. County Riverside and (P2b and P2c or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad La uinta Calif. Date 1959. photorevised 1980 T6E; R7E; W 1/2 of NW 1/4 of NE 1/4 of Sec 5 ; S.B. .B.M. Elevation: ca. 38 ft c. Address N/A City Zip d . UTM: (Give more than one for large and/or linear resources) Zone 11; 567,170 mE/ 3,727,110 mN UTM Derivation: 4 USGS Ouad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Located ca. 650 ft south of venue 0 and ca 1/2 mile west o£ Jefferson Street * P 3 a . Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) The site cornsists of one locus defined by a small F�ancentr�aLian guartz f i n w v overgrown with moderate amount of low brush *133b. Resource Attributes: (List attributes and codes)_ API lithic scatter_, AP3-ceramic scatter *P4. Resources Present: Building—Structure—Object 4 Site District Element of District Isolate—Other P 5 a . Photograph or Drawing (Photograph required for buildings, structures, and objects. P5b. Description of Photo: (view, date, accession #) *P6. Date Constructed/Age and Sources: Historic 4 Prehistoric Both *P7. Owner and Address:�px•omus Vacation Resorts 755 Crossover Lane, Memphis, T'_N 381.77-4900 *P8. Recorded by: (Name, affiliation, and address) Natasba Johnson an Ddroy W ` e ll, CRM TECH 2411 Sunset Drive, Riverside CA 92506 _ *P9. Date Recorded: August 13, 1999 *P10. Survey Type: (Describe) ns iv *P11. Report Citation (Cite survey report and other sources, or enter "none."): B Love a d 5ai "Tom-" Tang 19-921 - His t i 1 /Arg,]2aeological Resources Report; Promus VAagLLion ResJ r ue 0 C't n v California On file Eastern Information Center, university of California_ Riverside. - V --'D 1NI OCT i? 'I9JIJ EIC *Attach ments:_None 4 Location Map Sketch Map—Continuation Sheet—Building, Structure, and Object Record Archaeological Record—District Record—Linear Resource Record—Milling Station Record Rock Art Record _Artifact Record_Photograph Record_Other (List): DPR 523A (1/95) *Required information State of California --The Resources Agency Primary # 33-9010 DEPARTMENT OF PARKS AND RECREATION Trinomial CR-F_T.V=6354 ARCHAEOLOGICAL SITE RECORD Page 2 of 4 *Resource Name or rr kAssigneo oy recoruert Arun 'r6utl 4z2-.5 Al. Dimensions: a. Length tIL) b• Wldth Ca. 13 m (�-w) Method of Measurement: 4 Paced---Taped—Visual estimate Other: Method of Determination (Check any that apply.): Artifacts Features Soil Vegetation Topography__Cut bank_Animal burrow_Excavation_Property boundary _Other (Explain): Reliability of Determination: High—Medium-4 Low Explain: Highly disturbed Limitations (Check any that apply):—Restricted access_„vPaved/built over—Site limits incompletely defined. 4 Disturbances_ Vegetation Other (Explain):- Dista bed by current citrus grove to Wgst and due to locatiQ12 in wash are A2. Depth: None Unknown Method of Determination: *A3. Human Remains:—Present — Present_ Absent_Possible Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) None *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.)_ The site codefined by a small congentraziQn ok n n fI T within v t with moderate ow-o-y-nt of low br3ash. -- *A6. Were Specimens Collected? 4 No Yes (If yes, attach Artifact Record or catalog and identify where specimens are curated.) *A7. Site Condition: Good Fair Poor (Describe disturbances.): Itgm Al. *A8. Nearest Water (Type, distance, and direction.): whit w t r River, ca miles to th north *A9. Elevation: Ca, 38 ft above sea, leve, A10. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): Located within .1- cvaGh area with creosote bush and scrub brush A11. Historical Information: *Al2. Age: 4 Prehistoric 4 Protohistoric 4 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945_ Undetermined Describe position in regional prehistoric chronology or factual historic dates if known: 2rn12ab1v associate w; th the 1 a - hiah stand o$ ancigntt Lake Cahuilla. ca. AD 1650 A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know) A probab] e Desert Cahuilla site minimal data Potent A A14. Remarks: Testing recommended in survey resort (see Item P11) A15. References: (Documents, informants, maps, and other references.):_ See ItQM P11 A16. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: Q I TECH, 2411 Sunset Drive. Riverside- C 925Q� *A17. Form Prepared by: Dargy Wi Tang Date: Sent 1 1999 Affiliation and Address: CRM TECH, 2411 Sunset Drive Ri.verAide CA 225Q6 DPR 523C (1/95) *Required information State of California --The Resources Agency Primary # 33-9010 DEPARTMENT OF PARKS AND RECREATION HRI # LOCATION MAP Trinomial CA-R13L-6354 Page_3_-of _4*Resource Name or# (Assigned byreoonde ' *Scale: ca *Date ofMap: Her Park Rail� ILI, We lc� NVE 11 it IN Water 542 AVENUd CA tj _LJ CA -R IV -63551 project Well 30 NITP SCALE 1:24,000 0 1/2 1 mile 1000 0 1000 2000 30DO 4000 feet im / DPR 523J (1/95) *Required information mate or vanrornia--ine Hesources Agency Primary # 33-901Q _ DEPARTMENT OF PARKS AND RECREATION HRI # SKETCH MAP _ Trinomial CA-.R7y--6354 Page__L_of_A. *Resource Name or # (Assigned by recorder) S F3L'>'EC 42g_3 *Drawn by: Darcy Wiewal� *Date: September 1. 1999 fl' 419.` .... t: Er s' Oro sS't$'f �� •� + i x.. boundary i 37 9 'O E r 30 A o Debitage x • $herd K 0 15 30 nt ; :K 1"�""• •, x 36.1 7 DPR 523K (1/95) *Required information State of California --The Resources Agency DEPARTMENT OF PARKS AND RECREATION PRIMARY RECORD Other Listings Review Code Primary # 33-9011 HRI # Trinomial CA -RIM -6355 NRHP Status Code 7 Reviewer Page 1 of 4 *Resource Name or #: (Assigned by recorder) CRM TECH 429-4 P1. Other Identifier: *P2. Location: 4 Not for Publication Unrestricted *a. County Riverside and (P2b and P2c or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad La Ouinta, Calif. Date 1959, photorevised 1980 T6S; R7E; SW 1/4 of NW 1/4 of NE 1/4 of Sec 5 ; S.B. B.M. Elevation: Ca. 35 ft c . Address N/A City Zip d. UTM: (Give more than one for large and/or linear resources) Zone 11; 567,250 mE/ 3 , 72 6 , 97 0 mN UTM Derivation: � USGS Quad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Located ca. 1,200 ft. sQuth of Avenue 50 and ca. 1/2 mile west of Jefferson Street *133a. Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) The site consists of one locus defined by a small cQncant•raYion of nine tottery fraciments The site lies within a wash area with a dirt road bisecting it and a disturbed zone to the west which aptears to have been graded or road onstruction *P31J. Resource Attributes: (List attributes and codes)_ AP3-ceramic scatter *P4. Resources Present: Building—Structure—Object 4 Site District Element of District Isolate Other 5-a. Photograph or Drawing (Photograph required for buildings. structures, and objects. P5b. Description of Photo: (view, date, accession #) *P6. Date Constructed/Age and Sources: Historic 4 Prehistoric Both *P7. Owner and Address: Promus vacation Resorts. 755 Crossover Lane, Memphis, TN 38177-4900 *P8. Recorded by: (Name, affiliation, and address) Natasha Johnson, CRM TECH, 2411 Sµr3_set Drive Riverside CA 92506 *P9. Date Recorded: Aucn,. t 16 1999 *P10. Survey Type: (Describe) Intensive *P11. Report Citation (Cite survey report and other sources, or enter "none."): Bruce Love and Bai "Tom" Tang [19991• Historical/Arch,-eological Resources Report: Promus Vacation _Rgsgrt, Jeff s Stx:9et and Avenjag 50. CityLa Quinta, Rive side CalifQrnia. on file, E n rma Calif r Riverside. EIC *Attachments:_None 4 Location Map Sketch Map_Continuation Sheet—Building, Structure, and Object Record Archaeological Record—District Record—Linear Resource Record—Milling Station Record Rock Art Record _Artifact Record—Photograph Record_Other (List): DPR 523A (1/95) *Required information State of California --The Resources Agency DEPARTMENT OF PARKS AND RECREATION ARCHAEOLOGICAL SITE RECORD Y Primary # 33-9011 Trinomial CA-RIy-6355 Page 2 of 4 *Resource Name or # (Assigned by recorder) QZX Tpcij 429-4 Al. Dimensions: a. Length Qa. 93 m (E_W) b. Width Cg. 23 m (H -_a) Method of Measurement: 4 Paced Taped Visual estimate Other: Method of Determination (Check ar.y that apply.): 4 Artifacts Features Soil _ Vegetation ---Topography—Cut bank—Animal burrow—Excavation _Property boundary _Other (Explain): Reliability of Determination: High Medium 4 Low Explain: Highly disturbed Limitations (Check any that apply):—Restricted access—Paved/built over—Site limits incompletely defined q Disturbances Vegetation Other (Explain): A 2. Depth: None 4 Unknown Method of Determination: *A3. Human Remains:—Present Absent_ Possible 4 Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) None *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.) The site consists of one locus defined by a small concentratiQaJQ,s, nine pottery fragments. The site lies within a w gh area with a it; Kgad bisecting it and--a—disturbed zone to—the—w appears—to gKacIpd for road cgoatruction *A6. Were Specimens Collected? 4 No Yes (If yes, attach Artifact Record or catalog and identify where specimens are curated.) *A7. Site Condition: Good Fair 4 Poor (Describe disturbances.): See Itcm Al. *A8. Nearest Water (Type, distance, and direction.): miles to the north *A9. Elevation: Ca. 35 ft above sea level A10. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): Located within a wash area with creosote bush and scrub brush A11. Historical Information: N/A *Al2. Age: 4 Prehistoric 4 Protohistoric 4 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945_ Undetermined Describe position in regional prehistoric chronology or factual historic dates if known: Probably assogi,ated with the last high 6tand of gq]2gigpt Lake Cahuilla,ga, AD 1650 A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know) A probable A 14. Remarks: -Teal ng regg=pn51 gd in survey report s re, -e_ Item P11. ) A15. References: (Documents, informants, maps, and other references.): See Item P11. A16. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: CRM 'TECH. 241. Synset Drive. Riverside, CA 92506 *A17. Form Prepared by: Darcy Wiewall and Rai "Tom" Tana Date: Sent. 1, 1999 Affiliation and Address: CRM TECH 2411 Sun5e Drive Riygrsi de CA 92506 DPR 523C (1/95) *Required information State of California --The Resources Agency Primary # 33-9011 DEPARTMENT OF PARKS AND RECREATION HRI # LOCATION MAP Trinomial CA-RI31-U.55 Page 3 of 4 *Resource Name or # (Assigned by recorder) CRM TECH 429-4 *Map Name: La Ouinta, Calif. *Scale: 1:24,OOQ *Date of Map: 1959, phioLt-o-revised 1980 3 Trarlar Pax Ile ...k' Trailer cF6 4 i .1 NUAR L UN ii . ............... Wel \3 Ur Well 41D 32 60 " 11.0 W at e r 0 V-6353 _ICA -RI V -63i 16 CA -RI -6352 77 CA-RIV-E CA-RIV-6354 CA-RIV- 355 LL project boundary that . ..... . Ji Well `,..__.AVENw 5z kv pw,6 a M, SCALE 1.,24,000 0 1/2 1 mile .. ..... 1.000 0 1000 20M 30DO 4000 feet DPR 523J (1/95) *Required information 9 State of California --The Resources Agency Primary # 3 3 =9_Q 11 DEPARTMENT OF PARKS AND RECREATION HRI# CA-RIV-6355 SKETCH MAP Trinomial y Page__A_of 4 *Resource Name or # (Assigned by recorder)_ cgm TECH_429_4 *Drawn by: Darcy Wiewall *Date: September 1. 1999 •° r � � .. site boundary x 1116, ,� ] 1 - 3616 35. 16 .. s ,r 5 _4.7 a Sherd 34. !; 0 15n30 DPR 523K (1/95) *Required information State of California --The Resources Agency Primary # 33-9012 DEPARTMENT OF PARKS AND RECREATION HRI# PRIMARY RECORD Trinomial CA-RIV-6356 NRHP Status Cade 7 Other Listings Review Code Reviewer Date Page 1 of 4 *Resource Name or #: (Assigned by recorder) CRM TECH 429-5 P1. Other Identifier: *P2. Location: Not for Publication Unrestricted *a. County R'v i e and (P2b and P2c or P2d. Attach a Location Map as necessary.) *b. USGS 7.5' Quad La Ouinta, Calif. Date_ 1959, photorevised 198Q T6S; R7E; NW 1/4 of NE 1/4 of NE 1/4 of Sec 5 ; S.B. B.M. Elevation: Ca. 47 ft c . Address N/A City Zip d. UTM: (Give more than one for large and/or linear resources) Zone 11; 567, 600 mE/ 3,727, 160 mN UTM Derivation: � USGS Quad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Located ca. 500 ft. south of Avernze 5Q and ca -1/4 mile wast of iefferson_ Gtr -gets *133a. Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) `Phe site consists of one locus defimgd by a small- rugk. Al -so present ar modern cans. and-a-f-ew- burned-mescruite logs ca one meter, in length. The aile lie5 -on the tQip n f e surrounded by mgscruite. *P3b. Resource Attributes: (List attributes and codes) - clay, bon /she1J. _ * P 4. Resources Present:—_Building Structure Object 4 Site District Element of District P5a. Photograph or Drawing (Photograph required for buildings, structures, and objects.)^ P5b. Description of Photo: (view, date, accession #) * P 6. Date Constructed/Age and Sources: Historic 4 Prehistoric Both *P7. Owner and Address: Promus Vacation Resorts, 755 Crossover Lane, Memphis. TN 38177-4900 *P8. Recorded by: (Name, affiliation, and address) Natasha Johnson, TE H 2411 Suriset Drive, Riverside, CA 92506 *P9. Date Recorded: Aucrust 16, 1999 *P10. Survey Type: (Describe) Intensive *P11. Report Citation (Cite survey report and other sources, or enter "none."): RX:gce Love and Bai "Tom" Tang (1999)_:_ Historical/Archaeolocrical Resources Report: Promus_ Vacation Resort—Jefferson nd Avenue 50, CityLa Quintg, FiyergideCounty, California On fi1g Eastern Infgrm5l�i9n Center University of California Riverside. 00T i; I) 1999 EIC *Attach ments:_None 4 Location Map Sketch Map continuation Sheet—Building, Structure, and Object Record q Archaeological Record—District Record—Linear Resource Record—Milling Station Record Rock Art Record _Artifact Record—Photograph Record—Other (List): DPR 523A (1/95) *Required information State of California --The Resources Agency Primary #33-9012 DEPARTMENT OF PARKS AND RECREATION Trinomial cA-RIV-6356 ARCHAEOLOGICAL SITE RECORD Page 2 ofd_ *Resource Name or # (Assigned by recorder). cgi TECH 429-� A 1 . Dimensions: a. Length Ca. 24 m (N -SS) b. Width Ca . 16 m (E,: -_K ) Method of Measurement: 4 Paced Taped Visual estimate Other: Method of Determination (Check any that apply.): 4 Artifacts Features Soil Vegetation _Topography_Cut bank—Animal burrow—Excavation—Property boundary _Other (Explain): Reliability of Determination: High 4 Medium Low Explain: Site located on a mall dune surrounded by mescruite and little evidenQ,e of disturbance Limitations (Check any that apply):—Restricted access—Paved/built over Site limits incompletely defined 4 Disturbances q Vegetation Other (Explain): A2. Depth: None 4 Unknown Method of Determination: *A3. Human Remains:—Present — Present_ Absent_ Possible q Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) None *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.) n six nott_ry fragments. fired -clay pieces with pKpasionc and one fire - altered rock. AlsQ - ed modern CsIns, ite locts ca. one meter *A6. Were Specimens Collected? 4 No Yes (If yes, attach Artifact Record or catalog and identify where specimens are curated.) *A7. Site Condition: Good - Fair Poor (Describe disturbances.): See Item Al. *A8. Nearest Water (Type, distance, and direction.): JW itg3q tgr River ca 1.5 miles to the north A9. Elevation: Ca. 47 .ft above sea level A10. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): Located on a dune composed of sand from decomposing granite with a small. cluster of mesquite trees ^ All. Historical Information: N/A *Al2. Age: 4 Prehistoric 4 Protohistoric 4 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945_ Undetermined Describe position in regional prehistoric chronology or factual historic dates if known: Prghably a s soriated iditb the l Lake__Ca,huilla. ca. Ail 1650 7 7 t'e<C v U�(- Sk ,r -1'-5t C� A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know) A probable nieQes found at this—site haye--iMpregrzig1a,9 of gi�ickra of ]2ole, rare find shedding light on prehistoric -us-e o£ clay. A14. Remarks: Teat+ng recommended in nl4ryie .y ter2ort (see --Item P11) A15. References: (Documents, informants, maps, and other references.): See Item P11. Al 6. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: CRM TECH 2411 Sunset Drive R.iversidR CA 92506 *A17. Form Prepared by:__Darry wiewaII and 13ai ° Tom " Tang Date: ,5Q3pt, 1. 1999 Affiliation and Address: CRM TECH 2411 Sunset Drive,�Eiver,5i e CA 92506 DPR 523C (1/95) *Required information State of California --The Resources Agency Primary # 33 DEPARTMENT OF PARKS AND RECREATION HRI # LOCATION MAP Trinomial, c Page 3 of 4 *Resource Name or # (Assigned by recorder) c I TECH[ 429 — 5 *Map Name:- La Quinta, Calif. "Scale: 1;24,0Q0 "Date of Map:— 1252, phot oreyj,5ecj _19_89 J� vp 2 Lk Trailer Park Trailer Pdrk 4i ML NUR rj 11 II . . . ...... .__�,.� 'Wait P vnil 4 W1 L ".7 635 2 NU ; 33�; i=Welt � 5 ISO Water I, ICA-RIV-6353 CA -R IV- 6 A 3�5 2 A-RIV-6352 1 CA—RV. �W-63571 6354 54 Ian CA—RIV-6355 Lbproject oundary ............. ink IF ir ..........a Gets .......... A Well AVENUE J. 6'1 ti . Put'n SCALE 1:24,000 II 0 1/2 1 mlle F 9 1000 0 1000 2000 3000 000 feet Cl� DPR 523J (1/95) *Required information State of California --The Resources Agency Primary #_ 33-9012 DEPARTMENT OF PARKS AND RECREATION HRI# SKETCH MAP Trinomial cA-RIV-6356 rayc___1L_vr__�k_- Resource name or if kAssignea Dy recoraer) A')Q _C *Drawn by: _ Dargy Wzewall *Date: Sept gmber 1999 DPR 523K (1/95) *Required information State hof California --The Resources Agency DEPARTMENT OF PARKS AND RECREATION PRIMARY RECORD Page 1 of 4 Primary #33-9013 HRI # Trinomial cA-FiI17y6 1 57 NRHP Status Code Other Listings Review Code Reviewer Date *Resource Name or #: (Assigned by recorder)_ CRM TRC 429-6 P1. Other Identifier: *P2. Location: 4 Not for Publication Unrestricted *a. County Riverside and (P2b and Plc or Ptd. Attach a Location Map as necessary.) *b. USGS 7.5' Quad L i t Calif. Date 1859 mho arevi��r� 1880 TLS; R7 E ; —E 1/2 ONE 114 of NE 1/4 of Sec_; S. B. B.M. Elevation: C _ ft - c. Address N/A City Zip d. UTM: (Give more than one for large and/or linear resources) Zone 11; 567.770 mE/_3,727,24n mN UTM Derivation: USGS Quad GPS e. Other Locational Data: (e.g., parcel #, directions to resource, etc., as appropriate) Loca . ed ca. 500 ft soutks of Avera g-50 and ca 350 ft wes�_of Jeffearrnn r. -et * P 3 a . Description: (Describe resource and its major elements. Include design, materials, condition, alterations, size, setting, and boundaries) h r � QE l cum de 'moi] ;_bv a sm I �-4ne vmts, Thei h l0 11 �u a Wit a moderatQ amount o low brush *P3b. Resource Attributes: (List attributes and codes) AP�`scat> *P4. Resources Present: Building Structure Object 1� Site District Element of District Isolate Other P5a. Photo ra h or Drawin (Photograph required for buildings, structures, and objects.) 135b. Description of Photo: (view, date, accession #) *P6. Date Constructed/Age and Sources: Historic ' Prehistoric Both * P 7. Owner and Address Prams Vaca bion R_ escart 7 55 crossover an 38177-4900 i<�. Memphis TN *P8. Recorded by: (Name, affiliation, and address) Natasha Johnson CRM TECH, 241? Suns Drive,Riverside,et 2 06 *P9. Date Recorded: Ail just16, 1999 *P10. Survey Type: (Describe) intensive *P11. Report Citation (Cite survey report and other sources, or enter "none."): Buc Love and Bai "Tom" T`a_ncr11999i. I1: HistoricallArchaeolcal ResourAs Re pgrt Promus Vacation Resor_. efferson Street and Avenue 50City of L Riverside Calfcarnia Qn file�Eastern Information CEnt r. Universit o Cal'..forn a. Riverside--� °-- V EIC *Attach ments:_None 4 Location Map -!-Sketch Sketch Map_Continuation Sheet—Building, Structure, and Object Record Archaeological Record_District Record—Linear Resource Record—Milling Station Record_Rock Art Record _Artifact Record_Photograph Record—Other (List): DPR 523A (1/95) *Required information State of California --The Resources Agency Primary #_ 33 DEPARTMENT OF PARKS AND RECREATION Trinomial �A-RIV-6 ARCHAEOLOGICAL SITE RECORD - Page2 of *Resource Name or # (Assigned by tecorder)�gM Al. Dimensions: a. Length—JCA--L7—m--(X-,1!) b. Width ca. 20 Method of Measurement: 4 Paced Taped Visual estimate Other: Method of Determination (Check any that apply.):--i-Artifacts Features SOIL --Vegetation Cut bank --_Animal burrow —Excavation—Property boundary Other (Explain): Reliability of Determination: High Medium Low Explain:.. site l erodincr d mP yyi tr erate scru}7 rush Limitations (Check any that apply):_Restricted access _Paved/built over—Site limits incompletely defined Disturbances 4 Vegetation Other (Explain), A2. Depth: —None --T Unknown Method of Determination: *A3. Human Remains:—Present — Present_ Absent_ Possible q Unknown (Explain): *A4. Features: (Number, briefly describe, indicate size, list associated cultural constituents, and show location of each feature on sketch map.) Nono *A5. Cultural Constituents: (Describe and quantify artifacts, ecofacts, cultural residues, etc., not associated with features.) consists of one loc ��@fin�iY a --=Fa i h f dune with a modPra is amQ11nt ref 1py� br„�h *A6. Were Specimens Collected? 4 No Yes (If yes, attach Artifact Record or catalog and identify where specimens are curated.) *A7. Site Condition: Good 4 Fair Poor (Describe disturbances.): ee Item Al *A8. Nearest Water (Type, distance, and direction.): Whitewater RiY ca 1.5 miles to t!P nor - *A9. Elevation• Ca. 4Q f l—el A10. Environmental Setting: (Describe vegetation, fauna, soils, geology, landform, slope, aspect, exposure, etc.): LOI COM20Ia9d of sand fro d o o i rani it a t tr uc -1--o-w—brush A11. Historical Information: *Al2. Age: 4 Prehistoric q Protohistoric q 1542-1769_1769-1848_1848-1880_1880-1914_1914-1945 Post 1945—Undetermined Describe position in regional prehistoric chronology or factual his dates if known:__ Probably assn _toren w'thhe ncienL 2-1650 A13. Interpretations: (Discuss scientific, interpretive, ethnic, and other values of site, if know)_A_ QLQb pesert Cahui l 1 a site, mode"te data 3,gt i al A14. Remarks: Testing recommended in sur. f see I gM P 'c ) A15. References: (Documents, informants, maps, and other references.):_ See Item P 1 A16. Photographs: (List subjects, direction of view, and accession numbers or attach a Photograph Record.): Original Media/Negatives Kept at: QTECH. 2411 I v 0 546 *A17. Form Prepared by: ° Date:Sept. 1. 1999 Affiliation and Address: 2411 SirnsRt r ri srIQ nil **�xsi dp. Cp, 87.50 DPR 523C (1/95) *Required information State of California --The Resources Agency Primary # 33 -9013 �IDEPARTMENT OF PARKS AND RECREATION HRI LOCATION MAP Trinomial Page—of4 * 6 3—Resource Name or # (Assigned by recorder) QRM 'PPrT.7 429_F *Map Name: La Ouznt Com; F "Scale: I -,? 4 (inn *Date of Map:. 19 ........ .. ........ 0 Trailer Park Trailer 10 it NOE all ...... wo Qt "0 N33;� Ua ,wew 41) si Water 10 CA -R1 -6 53 CA IIV-6356 ti CA-RIV-6352 'i 0. t AVEN `t/ 7; CA-RIV-6357 CA-RIV-6354 rpm ro- EC7A-RIV-6355 project Waboundary Mr............ If • v ......... if AVENUE --ZV... SCALE 1:24,000 0 1/2 1 mile 1000 0 IDOO 21100 3000 4000 feet IEEE zm DPR 523J (1/95) *Required information Lof California --The Resources AgencyTMENT OF PARKS AND RECREATION Primary #TCH MAP HRI # f Page _of 4 Trinomial _ 'Resource Name or # (Assigned by recorder) y 'Drawn `Date: e 0 ,: DPR 523K (1/95) ' C 1 � 7 1 Y R. :., Site } �,d......Y . `r4 •. er^' arid.. >. vnw� , . - bounds i'f+' gg 'fl Ar fir' ,O 0 Sherd x w } 4'< DPR 523K (1/95) ' C 1 � 7 1 Y "Required information PALEONTOLOGICAL ASSESSMENT PALEONTOLOGICAL RESOURCE ASSESSMENT RJT HOMES LA QUINTA,RIVERSIDE COUNTY CALIFORNIA LSA Project No. RJT030 SUBMITTED TO: RJT Homes P.O. Box 810 La Quinta, California 92253 PREPARED BY: LSA Associates, Inc. 3403 10'' Street, Suite 520 Riverside, California 92562 909.781.9310 LSA July 6, 2000 LSAASSOCIATES, INC, TABLE OF CONTENTS Page MANAGEMENT SUMMARY ..................................................... . n INTRODUCTION................................................................ 1 PROJECT DESCRIPTION................................................... 1 PURPOSE OF THE INVESTIGATION ..................................... . .. 1 PERSONNEL............................................................. 1 METHODS............................................................... 3 NATURAL SETTING........................................................ . .... 3 GEOLOGICAL SETTING .. ................................................. 3 PALEONTOLOGICAL SETTING ............................................ 4 RESULTS...................................................................... 4 GEOLOGICAL RESULTS ................................................... 4 PALEONTOLOGICAL RESULTS ............................................ 5 RECOMMENDATIONS........................................................... 5 REFERENCES................................................................... 7 APPENDIX A - RECORDS SEARCH REQUEST LETTER LIST OF FIGURE 1- Project Location........................................................... 2 7/6/00(X:\Riverside\rjt-paleo\RJT-paleo-rpt-toc.wpd) 1 FLSAASSOCIATES. INC. MANAGEMENT SUMMARY LSA Associates, Inc. (LSA) was retained by RJT Homes of La Quinta to conduct a paleontological resource assessment and to design a paleontological salvage program for the RJT parcel at the southwest corner of Jefferson Avenue and 50`b Street in the City of La Quinta. The assessment identified the potential for paleontological resources as required by guidelines of the City of La Quinta, County of Riverside and the Society of Vertebrate Paleontology. A records and literature search was conducted for the subject property at the San Bernardino County Museum (SBCM), and a preconstrtiction survey of the parcel was completed on June 19, 2000. No fossils were located on the surface within the parcel boundaries; however, greenish gray silts at depth may be referable to sediments deposited by late Pleistocene Lake Cahuilla. The records search did not identify any paleontological resources within the project area. It did determine that the project area is located within the high shoreline of ancient Lake Cahuilla, and that the sediments underlying the project consist of lake sediments of Late Pleistocene and Early Holocene Age and near shore alluvium. These types of sediments are known to contain paleontological resources elsewhere in the Coachella Valley. The potential for significant nonrenewable vertebrate fossils was determined by the records search, and was substantiated by the sediments encountered during the field assessment. A paleontological resource impact program (PRIMP) is recommended for construction excavation on the parcel. This program will include excavation monitoring and specimen recovery including screen washing. The final compliance report will provide details of fossil identification, cataloging, and repository arrangements. Compliance with these recommendations will ensure that impacts to the paleontological resources are below a threshold of significance. 7/6/00«X:\Riverside\rjt-paleo\RJT-paleo-rpt.wpd)) 11 LSAASSOCIATES, INC. INTRODUCTION LSA Associates, Inc. (LSA) was retained by RJT Homes to conduct a paleontological resource assessment for the parcel located at Jefferson Avenue and 50th Street within the City of La Quinta, County of Riverside, California (Figure 1). The proposed residential development involves excavation on a 72 -acre rectangularly shaped parcel. The field work was conducted on June 19, 2000. The potential for significant nonrenewable paleontological resources was noted on the parcel, and a Paleontological Resource Impact Mitigation Program (PRIMP) is recommended for the excavation phase of development on the parcel. This PRIMP follows the guidelines of the Society of Vertebrate Paleontology and the Paleontological Resource Impact Mitigation guidelines of the City of La Quinta and of Riverside County. This program also serves to reduce impacts to paleontological resources to a level that is less than significant, as required in the California Environmental Quality Act (CEQA). PROJECT DESCRIPTION The RJT Homes project site is located on a 72 -acre rectangular parcel located within the north half of the northeast quarter of Section 5, T6S, R7E, San Bernardino Base line and Meridian, as shown on the La Quints 7.5 minute USGS Quadrangle map. The parcel is situated southwest of the intersection of Jefferson Avenue and 50" Street. Access from Interstate Highway 10 (I-10) is south via Washington Avenue or Jefferson Avenue. PURPOSE OF THE INVESTIGATION Paleontological (fossil) resources are considered to be a significant, non-renewable resource. They are afforded protection by both CEQA and the development standards of the County of Riverside and the City of La Quinta. Guidelines for Conformable Impact Mitigation have been published by the Society of Vertebrate Paleontology. As such, the potential for adverse impacts to these resources must be mitigated during construction excavation activities. This will be completed through an impact mitigation program that was developed after the assessment survey took place. Elevations on the parcel range from approximately 48 feet above sea level at the northwest corner of the parcel, to 37 feet above sea level at the south- central portion of the parcel. Since Pleistocene and Holocene stands of Lake Cahuilla ranged as high as 42 feet above sea level ( Waters, 1983, Wilke, 1978, Turner and Reynolds, 1977), the parcel has a long history of being near the margin of a water source that was present in Late Pleistocene and Early Holocene time. The geographic and depositional setting of the parcel, as well as the results of the records search, indicate that there is a high potential for sediments on the parcel to contain significant nonrenewable paleontological resources. PERSONNEL The field assessment of the parcel was conducted on June 19, 2000, by Robert E. Reynolds and Antonina Delu. Both have performed previous assessments in desert areas of southern California with paleontologic sensitivity. The records search and report writing were completed by Mr. Reynolds. Mr. Reynolds is a research associate of the Los Angeles County Museum, and former 7/6/00«X:\Riverside\dt-paleo\R1T-paleo-rpt.wpd>> V-11i fif YI 16 L r'I„ .• �. f ` Tr$i Y F•ae vrq.n�.T.. y = y. San San Bernardino County-�.. . P "'�tfr% rrtaJYf� ab. '�� a Bernardino p - °' a k" r 62 _ . Tfailef Pawn . Riverside Riverside County ' "Ai 97 �.' Mell .. 'fir u F 75 �3 PROJECT J Y ill �— Palm LOCATION / i ° n t. J k �' 7j-. Springs f ,�1 r f' I�paeno3'I 74 75 t1 Scale in Miles "• f9 ' `�.'¢ 1" it 'j ^� i. 7i o l0 20 �..� '� J3nr - l ; p/tI{s aN1 II h.Awn}aa� -� ?.f rf Yriinl. 'i {11I� , rl<'! 1 : '4Jx 7 t ^, -.-Z^, rr ;.: int - �j• ar, y.�,. • # / '+�W(!' � .r it _ iI'� � � �-, '~ � Y PROJECT r� u �,�.,.....,} byt 1 •. fr�ii.r4 . LOCATION i i. �!s" r -vs 5 ii..s f. _.." C7 11 f,• �' H .,- • . ; . I i AVENUE SQ * � e ; ' . ' a� "e � VENU - d ;'�- ✓�.,. c -(efifes is ria F,b .Y- L... ,� df no: "Mu '06 t 7 e�ilmnQ' '.iixJt y[wM` 11' .00 k i it i4f>e^4gfi Y lr f11�1 r �v li Y is / ♦ � x " ^"•��--• •r ywi�. ii L �a� YrliOii�f 11rrrL�L``' • F>i. } o ±4 4 ibar - rrbwrfr r/ k Y ts✓S w ea.t;."c, f.. ffib.. f... 1 6 r� U .s y w 4?♦, .. C.+i � .� � ♦ • • fit. atn�.. t �.. V� "w'? IIF ips•"5 '�Y3A! K• ia•}yY1 r +V +�I{ ■ 4riwnp „ l: 'i!9,+ia t�•$�FA..niL ryI !f, r taw iib r . yytt 5�s.w yttyii lrqrq,►wfii: +1w+,,��gr9 bp_µrµ., :'F M+L"1°o�Y��L E h:.-.-+• itaSueaa I� ta"aa•F �: aaf �.c rf .:' Ij _ -•r- i� y0 @f r." ...a, sea ii4Y i]K• i fr v -. iw c,. »� Ye.r �- 4 trait ..tom oanaLtrniiiR"k'i'.x sis 7q ►.fita.ar <. r.,,..A .0 Fen r■ p� „ of new aY ' yi" . a.1 to v; nvai�i�r+r ei. rl� Y,ry •-fi esv •r• Ir -�-'t+- "� I� "*+rf rai�iYFirav r• a •rister .., �a• I - ♦ ::4 ..Y• f ♦VA A4,af/4 q" i, ii 4 4~"F '� '�+f tlF ►, ii mr/f klY -.f/ fir,. Aii�! •4" w F✓'+°aw 4 13 4 r�vx ew f■ff$f�b#v/b 4 G I Rra+oq� W �•�:. a ,1—'r, •'i:... Nr -..nn- f r' YtJSi:IJSli14i F1ds'1 Dr p�,• :male aao• ry •r:frriohe fIY .art s °- . xacin+l" �-'•,•� IF is .� fYrYf k 7 IF r �•-�. :b,ai Ad,' 9 kh•niF ifiayb fbr<r _ r"4=��" Ir rC-::. avaw- ♦. [�`. eaq:,riiie iatid ! .ti u r ii+ra Abgi a�,yr es/i.Mr 'k" '� m JB ... s 'j{I�+erarr�i. Ma wFefr r � �, 3�- J Y666F/ Ona• sa '0_"„ ♦ i .ej� Ir 41. / l�iaororA — '`71 ,...-AVENUE c ra r% p 7.10 ik ;i"o mb •S n r/ Y T `,,, -ab /rlfY ° La Quint :"t 5 JJ ed,Fa'Yffla4ifeliY.O♦,+f� •�^�. `.7 ti +_ ti I .a ab -Y e isgYaw i; 'Source: USGS 7.5' Topo Quad. La Quint&, CA. rev 1980. ' �' IL 6/29/00(RJT030/Culrural) LS A LSA Associates, Inc. 41oe a" imo' 2,000' N Figure 1 RJT Homes Project Location and Vicinity LSAASSOCIATES. INC. Curator of the San Bernardino County Museum. He has 18 years of experience with paleontologic salvage programs and 35 years of research experience in southern California and Nevada. METHODS The records search was conducted through the Regional Paleontological Locality Inventory (RPLI), located at the San Bernardino County Museum, to identify all previous paleontological resource assessments and localities that are within 1 mile of the project area. To date, the RPLI has not responded to the search request. The literature search utilized materials in the library of LSA and the personal library of the author. The field survey of the project area was conducted on foot and included all areas of the 72 -acre parcel that might be impacted by excavation. The entire project area was surveyed using systematic transects spaced approximately 10 meters apart. Intact exposures remained at isolated knolls within the parcel and the sedimentary section could also be seen in the sump located in the east portion of the parcel. NATURAL SETTING GEOLOGICAL SETTING The project area is located in the northwestern portion of the Colorado Desert province in the Coachella Valley. The Colorado Desert province is bounded on the north by the southern edge of the eastern Transverse Ranges, and by the Mojave Desert Province which includes the Chocolate Mountains. On the east is the Colorado River, and on the southwest are the Peninsular Ranges (Norris and Webb, 1976). A major feature in the Colorado Desert province is the Salton Trough, a 180 -mile (290 -km) structural depression that extends from the area around Palm Springs to the head of the Gulf of California. Movement along the San Andreas Fault from the Miocene to the present created the trough. During the Pleistocene and Holocene, the trough was filled with over 4,000 feet of sediment (Proctor, 1968). The term "Salton Trough" refers to the entire basin from San Gorgonio Pass to the Gulf of California; the term Salton Basin refers to the region that drains directly into the Salton Sea. The majority of the Colorado Desert lies at low elevations. The Colorado River Valley at the Riverside -San Bernardino County Line is at an elevation of 350 feet (107 m) above sea level; the elevation at Winterhaven in the southeast corner of the province is 130 feet (40 m) above sea level. The lowest elevation is the Salton Basin, which is divided into the Imperial Valley in the south and the Coachella Valley in the north. The Salton Sea is located in the central portion of the Basin, and has a surface elevation of -235 feet ( -72 m) below sea level. Lake Cahuilla is the name given to the freshwater lake that occupied the basin in the past. Evidence for this lake includes fossil gastropods, pelecypods, fossil fish and other vertebrates, and travertine (tufa) deposits that indicate high stands around the margin of the basin. The travertine deposits were secreted by algae below the waterline along the edge of Lake Cahuilla. Although the entire history of the lake is not known, it is likely that Lake Cahuilla filled on several occasions when the Colorado River reversed its course on the delta at the Gulf of California and ran northward into the Salton Basin (Norris and Webb, 1976, Waters, 1983). Between fillings of the lake, evaporation lowered the 7/6/00(<X:\Riverside\rjt-paleo\RJT-paleo-rpt.wpd)) 3 LSAASSOCIATES, INC. level of the lake, leaving a brine or a salty crust on the basin floor. Dates on tufa at Travertine Point (Turner and Reynolds, 1977) indicate an early filling of the lake 17,000 years ago. Petroglyphs were carved in the tufa of Travertine Point around 9,000 years ago. In the late Holocene, the lake filled and evaporated at intervals. In the last 2,000 years, the lake filled around BC 100, AD 1000, and AD 1300. The latter lake had evaporated before Spanish exploration reached the lower Colorado in 1540 (Norris and Webb, 1976, Wilke, 1978). The formation of the Salton Sea in 1905 was the result of an agricultural accident. The sediments exposed on the RJT parcel at the corner of Jefferson Avenue and 50`h Street are described stratigraphically from the lowest and presumed oldest. These are massive greenish -gray ?Pleistocene silts and clays, exposed at low elevations on the parcel and deposited by a series of Pleistocene and early Holocene lakes with shorelines up to 47 feet (Wilke, 1978). These are overlain by late Holocene lacustrine (lake) deposits of micaceous, bedded, silty sands. As the sedimentary strata approach the 42 -foot elevation, they reach the age of the last major stand of Lake Cahuilla between AD 1350 - 1550 (Wilke, 1978). Artificial topography on the parcel was created prior to 1958 when higher and lower levels of citrus groves were developed with an internal drainage to a central sump. Since that time, aeolian sand has covered certain hills and leeward slopes, and silts have ponded on the parcel. PALEONTOLOGICAL SETTING Many paleontological localities are known from Lake Cahuilla sediments. Specimens from these include gastropods (snails) and pelecypods (clams) and the vertebrate remains of fish, birds, reptiles, amphibians and mammals. The vertebrate remains range in size from small fish, reptiles and birds to large mammals such as Bighorn Sheep (Ovis sp.), Camels (Camelops sp), proboscidean (Mammuthus? sp.), and horses (Equus sp.)(Reynolds, 1989; Rymer, 1989). RESULTS GEOLOGICAL RESULTS The sediments of the parcel are lacustrine deposits, including silts and sandy silts. The lowest deposits in the project area are greenish -gray clayey silt. Gray silts higher in the section contain varying amounts of mica. The micaceous silts reflect the carrying capacity of the currents in the lake; mica -rich silts reflect near -shore current and wave action. The surficial aeolian sediments consist of white sand that covers the portions of the sedimentary units described above. These dune sands made exposures of the stratigraphic section difficult to examine. PALEONTOLOGICAL RESULTS The results of the literature search do not indicate that there have been paleontological assessments conducted near the project area. Additionally, there were no nearby previously -recorded paleontological localities mentioned within the literature that was reviewed by the author. Geologic mapping (Rogers, 1965) indicates that the project is located below the high shoreline of, and within ancient Lake Cahuilla, and that sediments in the project area are composed of lake 7/6/00<<X:\Riverside\r t-paleo\RiT-paleo-rpt.wpd)) 4 LSA ASSOCIATES, INC. sediments overlain by near-shore silts. The literature indicates that paleontological resources have been recovered from similar sediments, 10 miles north of the project area (Rymer, 1989, 199 1) and to the east (Reynolds, 1989). Fossil mollusks have been recovered during a monitoring program from the nearby Norman Golf Course (Reynolds, 1999). Fossil mollusks were observed during the paleontological survey. These fossil gastropods and t pelecypods reinforced the concept that the sediments were deposited in the lacustrine environment of Lake Cahuilla. These mollusks included the following taxa: Anodonta sp. Fresh water clam Planorbula sp. Fresh water planispiral snail Physa sp. Fresh water snail The fresh water mollusks indicate that deposition was below the lake surface, and the presence of the clam indicates moving and fresh water (Schneider, 1989). The fresh water snails suggest the presence of vegetation such as water reeds that these mollusks lived on. The snails preferred relatively clear, fresh water, and showed little tolerance for bodies of water with high salinity that have been subject to evaporation over long periods of time. The complete picture indicates that the environment of deposition was in a fresh water lake near a shoreline with lacustrine vegetation. RECOMMENDATIONS Geologic mapping and the available literature indicate that the parcel contains sediments deposited by ancient Lake Cahuilla. Fossil mollusks located during the field assessment reinforce the presence of sediments that can be attributed to Lake Cahuilla, which have a high potential for containing remains of vertebrate fossils. Excavation for the proposed project has potential to impact significant nonrenewable paleontological resources. The project proponent must retain a qualified vertebrate paleontologist to carry out a PRIMP. This program must conform to the guidelines of the City of La Quinta and the County of Riverside and to recommendations of the Society of Vertebrate Paleontology. The PRIMP must include project specific measures to reduce impacts to the fossils to a level less than significant. The program must include, but not be limited to: A. Monitoring of excavation by a qualified vertebrate paleontologic monitor to recover paleontological resources. The monitor shall be empowered to temporarily halt or redirect construction activities to ensure avoidance of adverse impacts to paleontological resources. The monitor shall be equipped to rapidly remove any fossil specimens encountered during excavation. B. Preparation of recovered specimens to a point of identification, including washing of sediments to recover small fossil vertebrates. If small fossils are encountered, a standard, 6,000 pound bulk matrix sample will be collected from each locality. Removal of surplus sediment from around the specimens reduces the volume of storage for the repository and the storage cost for the developer. C. Itemized catalogs of all material collected and identified will be provided to the museum repository with the specimens. A report documenting the results of the 7/6/00«X:\Riverside\rj t-paleo\RJT-paleo-rpt.wpd» LSAASSOCIATES. INC. monitoring and salvage activities, and analyzing the significance of the fossils will be prepared. D. Preparation of a report with an appended, itemized inventory of specimens. The fossils from the project shall be housed in a museum repository for permanent curation and storage. Currently, charges of a one-time curation fee for paleontological materials are approximately $75 per cubic foot. The report and inventory, when submitted to the lead agency, signifies the completion of the program to mitigate impacts to paleontological resources. Compliance with these recommendations will ensure that impacts to the paleontological resources are below a threshold of significance as required in the California Environmental Quality Act (CEQA). 7/6/00(<X:\Riverside\rjt-paleo\RJT-paleo-rpt.wpd)) 6 LSAASSOCIATES, INC. REFERENCES CITED Norris, Robert M., Robert W. Webb 1976 Geology of California. John Wiley and Sons. New York Proctor, R. J. 1968 Geology of the Desert Hot Springs Upper Coachella Valley Area, California. California Division of Mines and Geology, Special Report 94. Reynolds, R. E. 1989 Paleontological monitoring and salvage : Imperial Irrigation District transmission line, riverside and Imperial Counties, California. Prepared for Mission Power and engineering Company, Irvine, California. p258. Reynolds, R. E. 1999 Paleontological resource monitoring program, Norman Golf Course, City of La Quinta, Riverside County, California. Prepared for KSL Development Corporation, La Quinta, California. p8. Rogers, T. H. 1965 Geologic Map of California, Santa Ana Sheet. California Division of Mines and Geology, Scale 1:250,000. Rymer, M. J. 1989 New Quaternary age control for strata within the Indio Hills, southern California, in Abstracts of Proceedings, 1989 Mojave Desert Quaternary Research Symposium, San Bernardino County Museum Association Quarterly, V. XXXVI, No. 2, p. 64. Rymer, M. J. 1991 The bishop Ash Beds in the Mecca Hills, in Geological excursions in southern California and Mexico, M. J. Walawender and B. B. Hanna (eds). San Diego, Geological Society of America Meeting Guidebook: 388-396. Turner, W. G. and R. E. Reynolds, 1977 Dating the Salton Sea petroglyphs. Science News, 111 (February). Schneider, J. S. 1989 Fresh Water Bivalves as Paleoenvironmental Indicators. Abstracts of Proceedings, 1989 Mojave Desert Quaternary Research Symposium, San Bernardino County Museum Association Quarterly, V. XXXVI, No. 2, p. 65 Waters, M. R. 1983 Late Holocene Lacustrine Chronology and Archaeology of Ancient Lake Cahuilla, California. Quaternary Research, Vol. 19, No. 3, May 1983, pp 373 - 387 Wilke, P. J. 1978 Late Prehistoric Human Ecology at Lake Cahuilla, Coachella Valley, California. Contributions of the University of California Archaeological Research Facility 38. 7/6/00((X:\Riverside\rjt-paleo\RJT-paleo-rpt.wpd>> 7 LSAASSOCIATES, INC. APPENDIX A - RECORDS SEARCH REQUEST LETTER 7/6/00«X:\Riverside\r t-paleo\RJT-paleo-rpt.wpdN LSAASSOCIATES. INC. sediments overlain by near -shore silts. The literature indicates that paleontological resources have been recovered from similar sediments, 10 miles north of the project area (Rymer, 1989, 199 1) and to the east (Reynolds, 1989). Fossil mollusks have been recovered during a monitoring program from the nearby Norman Golf Course (Reynolds, 1999). Fossil mollusks were observed during the paleontological survey. These fossil gastropods and pelecypods reinforced the concept that the sediments were deposited in the lacustrine environment of Lake Cahuilla. These mollusks included the following taxa: Anodonta sp. Fresh water clam Planorbula sp. Fresh water planispiral snail Physa sp. Fresh water snail The fresh water mollusks indicate that deposition was below the lake surface, and the presence of the clam indicates moving and fresh water (Schneider, 1989). The fresh water snails suggest the presence of vegetation such as water reeds that these mollusks lived on. The snails preferred relatively clear, fresh water, and showed little tolerance for bodies of water with high salinity that have been subject to evaporation over long periods of time. The complete picture indicates that the environment of deposition was in a fresh water lake near a shoreline with lacustrine vegetation. RECOMMENDATIONS Geologic mapping and the available literature indicate that the parcel contains sediments deposited by ancient Lake Cahuilla. Fossil mollusks located during the field assessment reinforce the presence of sediments that can be attributed to Lake Cahuilla, which have a high potential for containing remains of vertebrate fossils. Excavation for the proposed project has potential to impact significant nonrenewable paleontological resources. The project proponent must retain a qualified vertebrate paleontologist to carry out a PRHY2. This program must conform to the guidelines of the City of La Quinta and the County of Riverside and to recommendations of the Society of Vertebrate Paleontology. The PRIMP must include project specific measures to reduce impacts to the fossils to a level less than significant. The program must include, but not be limited to: A. Monitoring of excavation by a qualified vertebrate paleontologic monitor to recover paleontological resources. The monitor shall be empowered to temporarily halt or redirect construction activities to ensure avoidance of adverse impacts to paleontological resources. The monitor shall be equipped to rapidly remove any fossil specimens encountered during excavation. B. Preparation of recovered specimens to a point of identification, including washing of sediments to recover small fossil vertebrates. If small fossils are encountered, a standard, 6,000 pound bulk matrix sample will be collected from each locality. Removal of surplus sediment from around the specimens reduces the volume of storage for the repository and the storage cost for the developer. C. Itemized catalogs of all material collected and identified will be provided to the museum repository with the specimens. A report documenting the results of the 7/6/00<<P:\RJT030\RJT-paleo-rpt.wpdN 5 LSAASSOCIATES. INC. monitoring and salvage activities, and analyzing the significance of the fossils will be prepared. D. Preparation of a report with an appended, itemized inventory of specimens. The fossils from the project shall be housed in a museum repository for permanent curation and storage. Currently, charges of a one-time curation fee for paleontological materials are approximately $75 per cubic foot. The report and inventory, when submitted to the lead agency, signifies the completion of the program to mitigate impacts to paleontological resources. Compliance with these recommendations will ensure that impacts to the paleontological resources are below a threshold of significance as required in the California Environmental Quality Act (CEQA). 7/6/00((P:\RJT030\RJT-paleo-rpt.wpd)) 6 LSA June 16, 2000 LSA ASSOCIATES, INC. OTHER OFFICES: ONE PARK PLAZA,SUITE 500 949.553•o666 TEL BERKELEY RIVERSIDE IRVINE, CALIFORNIA 92614 949.553.8076 FAX PT. RICHMOND ROCKLIN Mr. Eric Scott Curator of Paleontology San Bernardino County Museum 2024 Orange Tree Lane Redlands, California, 92374 Subject: Request for Paleontological Resources Records Search for an area Near La Quinta, Riverside County, California Dear Eric: LSA associates, Inc. (LSA) would like to obtain a paleontological resource records search for a project in the Riverside County east of La Quinta. Specifically, the parcel is located in the NE 1/4 of Section 5, T.6 S., R. 7 E., SBBM, as shown on the La Quinta 7.5' USGS Quadrangle map. The parcel is at the southwest corner of Jefferson Street and 50m Avenue. LSA requests that you search for paleontological resource locality records within a mile of this parcel. Please let us know if the sediments on or around the site have a high or undetermined potential to contain paleontological resources. If localities are found, please plot on a map and foreward to my office (FX 909 7798924). Thank you for your assistance. Sincerely, LSA ASSOCIATES, INC. Robert E. Reynolds Paleontology Attachment 6/16/00(X:\Riverside\rjt-paleo\records-search-]tr.wpd) PLANNING I ENVIRONMENTAL SCIENCES I DESIGN DEPARTMENT OF COMMUNITY AND CULTURAL RESOURCES SAN BERNARDINO COUNTY MUSEUM 2024 Orange Tree Lane - Redlands, CA 92374 • (909) 307-2669 Fax (909) 307-0539 27 June 2000 LSA Associates, Incorporated attn: Robert Reynolds 3403 10'h Street, Suite #520 Riverside, CA 92501 COUNTY OF SAN BERNARDINO PUBLIC SERVICES GROUP PAUL J. OLES Museums Director re: PALEONTOLOGY RECORDS REVIEW, LA QUINTA QUADRANGLE, RIVERSIDE COUNTY, CALIFORNIA Dear Mr. Reynolds, The Section of Geological Sciences of the San Bernardino County Museum (SBCM) has completed a records search for the above -referenced area near La Quinta, Riverside County. The study area is located in the northeast portion of section 5, Township 6 South, Range 7 East, San Bernardino Base and Meridian, as seen on the La Quinta, California 7.5' United States Geological Survey topographic quadrangle map (1967 edition; photorevised 1980). The study area lies within the Salton Trough, a northward extension of the Gulf of California (McKibben, 1993). The Salton Trough lies below sea level, and is an active continental rift underlain by the landward extension of the East Pacific Rise; it is surrounded on three sides by mountains and bounded to the southeast by the Colorado River delta. Since the beginning of the Holocene Epoch [f 11,000 years before present (ybp)], the Colorado River delta has blocked marine water from entering the Salton Trough from the Gulf of California. Freshwater lakes have existed intermittently in the deeper parts of the basin that developed landward of the Colorado River delta (Van de Kamp, 1973; Waters, 1983; Maloney, 1986; Whistler and others, 1995). Previous geologic mapping of the La Quinta region by Rogers (1965) indicates that the study area is located upon Quaternary lake sediments deposited below the 12 -meter high shoreline of ancient Lake Cahuilla, which is thought to have existed intermittently from 470 ybp to at least f 6,000 ybp (Van de Kamp, 1973; Waters, 1983; Whistler and others, 1995). These lacustrine sediments were deposited during each of at least seven high stands of Lake Cahuilla, each high stand resulting from flooding of the Salton Trough by inflow from the Colorado River (Waters, 1983). Fluvial sediments in the area were laid down during intervening lake low stands when the lake bed was dry. These alternating lacustrine and fluvial sediments, termed herein the Lake Cahuilla beds, have previously yielded fossil remains representing diverse freshwater diatoms, land plants, sponges, ostracods, molluscs, fish, and small terrestrial vertebrates. As a result, the Lake Cahuilla beds have high potential to contain non-renewable fossil resources that are subject to adverse impact from r Paleontology literature search, LSA Associates: La Quinta 2 development -related excavation. A review of the Regional Paleontologic Locality Inventory (RPLI) at the SBCM was conducted by the staff of the Section of Geological Sciences, SBCM. The results of this review indicated that no paleontologic localities are recorded within the boundaries of, or within one mile of, the proposed La Quinta property. However, Whistler and others (1995) discuss paleontologic resource localities from this region that have produced fossils from sediment lithologies mapped (Rogers, 1965) as similar to those within the boundaries of the proposed project property. Five sampling sites yielded diatoms, land plants, sponges, molluscs, ostracods, bony fish, reptiles, birds and small mammals (Whistler and others, 1995). The lowest stratigraphic unit in this region was radiometrically dated to 5,890 f 60 ybp, which indicated a high stand of ancient Lake Cahuilla older than any described previously. These sites are mapped (Whistler and others, 1995) as near or within the boundaries of the proposed La Quinta property; however, this mapping is diagrammatic and the precise location of these sites cannot be determined from the published account. A review of the paleontologic locality records of the Natural History Museum of Los Angeles County is recommended to confirm whether the sampling sites described by Whistler and others (1995) are near or within the proposed project boundaries. The results of the literature review and the check of the RPLI at the SBCM demonstrate that excavation in the Lake Cahuilla beds in the La Quinta region has high potential to impact significant nonrenewable fossil resources. This property is therefore assigned high paleontologic sensitivity. Please do not hesitate to contact us with any further questions you may have. References Maloney, N.J., 1986. Coastal landforms of Holocene Lake Cahuilla, northeastern Salton Basin, California. In P.D. Guptil, E.M. Gath and R.W. Ruff (eds.), Geology of the Imperial Valley, California. South Coast Geological Society, Santa Ana, California 14: 151-158. McKibben, M.A., 1993. The Salton Trough rift. In R.E. and J. Reynolds (eds.), Ashes, faults and basins. San Bernardino County Museum Association Special Publication 93-1: 76-80. Rogers, T.H., 1965. Geologic map of California, Santa Ana sheet. California Division of Mines and Geology. Scale 1:250,000. Van de Kamp, P.C., 1973. Holocene continental sedimentation in the Salton Basin, California: a reconnaissance. Geological Society of America Bulletin 84: 827-848. Waters, M.R., 1983. Late Holocene lacustrine chronology and archaeology of ancient Lake Cahuilla, California. Quaternary Research 19: 373-387. Whistler, D.P., E.B. Lander and M.A. Roeder, 1995. A diverse record of microfossils and fossil plants, invertebrates, and small vertebrates from the late Holocene Lake Cahuilla beds, Riverside County, California. In P. Remeika and A. Sturz (eds.), Paleontology and Geology of the Western Salton Trough Detachment, Anza-Borrego Desert State Park, California, p. 109-118. W r Sincerely, Eric Scott, Curator of Paleontology Section of Geological Sciences San Bernardino County Museum I: Paleontology literature search, LSA Associates: La Quints 3 L L i t L RJT Homes Site, Avenue 50 and Jefferson Street Biological Assessment Prepared for: RJT Homes P.O. Box 810 La Quinta, CA 92253 (760) 564-6555 (FAX) 564-6505 Prepared by: Ogden Environmental and Energy Services 3120 Chicago Avenue, Suite 180 Riverside, CA 92507 (909) 369-8060 (FAX) 369-8035 June 20, 2000 Ogden Environmental and Energy Services Nathan Moorhatch Wildlife Biologist L RJT Homes Site, Avenue 50 and Jefferson Street Biological Assessment Introduction Ogden Environmental and Energy Services (GEES) was contracted by RJT Homes to perform a biological assessment on a 72 -acre site located on the southwest corner of Avenue 50 and Jefferson Street in the City of La Quinta in Riverside County, California. The site is bordered by Avenue 50 and former agricultural lands to the north, Jefferson Street and a residential development on the east, the La Quinta Resort and Club to the south, and residential development on the west. The parcel is specifically located in the northern '/Z of the northeast '/4 of Section 5, Township 6 South, Range 7 East, as shown on the U.S.G.S. 7.5 minute La Quinta, California Quadrangle (see Maps 1 and 2). The current projected plans consist of conversion of the entire 72 -acre property to residential development. This biological assessment consisted of a literature review, a site survey to perform a general inventory of plants and animals, a determination of habitat suitability for sensitive species, and determination of potential impacts and mitigation measures. Methods A literature review was conducted to identify sensitive biological resources known from the vicinity of the project site. This included consultation with the California Department of Fish and Game's (CDFG) California Natural Diversity Data Base (CNDDB) computerized data base, and a review of the California Native Plant Society's (CNPS) Rare and Endangered Vascular Plants of California. The Soil Survey of Riverside County, California, Coachella Valley Area (Knecht 1980) was reviewed to determine soil types on the project site. Field surveys were conducted by Nathan T. Moorhatch of OEES on June 16, 2000. Surveys were performed during the morning and early afternoon hours (0930-1400). The assessment of the potential for occurrence of many of the sensitive plants known from the La Quinta quadrangle was based on geographic range, habitat associations, and soil types. All plant and vertebrate species observed were recorded. Unobserved wildlife species were identified through indirect sign (e.g. scat, tracks, calls, nests, burrows, etc.). Scientific nomenclature for this report is from the following standard reference sources: plant communities, Holland (1986) and Sawyer and Keeler -Wolf, (1995); flora, Hickman (1993) and Munz (1974); reptiles, Stebbins (1985),- birds, 1985);birds, American Ornithologists Union (1998); and mammals, Laudenslayer and Grenfell (1983). 1 RJT Bio. Ass., Ogden Environmental & Energy Services Finsert Map 2 r RIT Bio. Ass., Ogden Environmental & Energy Services The only reptile observed during the survey was Great Basin Whiptail (Cnemidophorus tigris tigris). Other common reptiles such as Side -blotched Lizard (Uta stansburiana) and Red Coachwhip (Masticophis flagellum piceus) likely inhabit the site, but were not observed during the survey period. The extensively disturbed nature of the site; coupled with the fact that many reptile species are inactive and/or seek shelter during the hotter parts of the day, may account for the lack of diversity of reptile species observed. Birds detected during the current survey include a mix of species common to undeveloped and developed areas of the Coachella Valley (see Appendix A for a complete list of birds observed on the site): Some of the bird species observed included: American Kestrel (Falco sparverius), Gambel's Quail (Callipepla gambelii), Mourning Dove (Zenaida macroura), White - winged Dove (Zenaida asiatica), Western Kingbird (Tyrannus verticalis), Verdin (Auriparus flaviceps), and House Finch (Carpodacus mexicanus). Two mammal species were observed on the property during the survey: Desert Cottontail (Sylvilagus audubonii), and California Ground Squirrel (Spermophilus beecheyi). Again, additional mammal species are expected to utilize or occur on the site, but were not observed due to their nocturnal or fossorial habits. Sensitive Elements Plant or animal taxa may be considered "sensitive" due to declining populations, vulnerability to habitat change or loss, or because of restricted distributions. Certain sensitive species have been listed as Threatened or Endangered by the United States Fish and Wildlife Service (USFWS) or by the California Department of Fish and Game (CDFG) and are protected by the federal and state Endangered Species Acts and the California Native Plant Protection Act. Other species have been identified as sensitive by the USFWS, the CDFG, or by private conservation organizations, including the CLAPS, but have not been formally listed as Threatened or Endangered. Such species can still be considered significant under the California Environmental Quality Act (CEQA). The literature review, and OEES biologists' knowledge of the project vicinity, indicated that as many as 12 sensitive plants and animals potentially occur in the vicinity of the project site. For a summary"of sensitive species known to occur or potentially occurring in the vicinity of the property, see Tables 1 - 4. The three plants in Table 1 are associated with a variety of habitats (e.g. rocky alluvial to dune areas), which are not present on the project site. Since the entire property has been modified through agricultural use, there is no potential for these plants to occur on the site. Table 2 lists two species of sensitive reptiles that occur in sandy/dune habitats. The Flat - tailed Horned Lizard historically occurred in the vicinity of the project site (CNDDB record from Bermuda Dunes 1978), but has been extirpated from much of the western Coachella Valley due to habitat loss. The RJT property does not support suitable habitat for this species, and Flat -tailed Horned Lizards are not present on the project site. Similarly, the site does not contain suitable blowsand habitat for Coachella Valley Fringe -toed Lizard. This state -listed endangered and federal threatened species does not occur on the project site. One sensitive bird species was noted on the site during the survey. Three Black -tailed Gnatcatchers were observed on the western portion of the RJT project site foraging in mesquite. This bird is considered an "Audubon State WatchList" species and is included on the CDFG fist of "Special Animals", but is not fisted as threatened or endangered. Five other sensitive bird species are known from the general vicinity of the project site (see Table 3). Of the five species listed in Table 3, only the Loggerhead Shrike is thought to have a moderate to high potential of occurring 5 RJT Bio. Ass., Ogden Environmental & Energy Services KEY F: Federal (Endangered, Threatened, Special Concern) C: California (Endangered, Threatened, Special Concern) CEQA: mandatory consideration for CEQA CEQA?: CNPS recommends consideration for CEQA California Native Plant Society (CNPS) designations: (Note: According to CNPS [Smith and Berg 1988], plants on Lists 1B and 2 meet definitions for listing as threatened or endangered under Section 1901, Chapter 10 of the California Fish and Game Code.) List 1 B: Plants rare and endangered in California and throughout their range. List 2: Plants rare, threatened or endangered in California but more common elsewhere. List 3: Plants for which more information is needed. List 4: Plants of limited distribution; a "watch list." CNPS R -E -D Code: Rarity 1: Rare, but found in sufficient numbers and distributed widely enough that the potential for extinction or extirpation is low at this time. 2: Occurrence confined to several populations or one extended population. 3: Occurrence limited to one or a few highly restricted populations, or present in such small numbers that it is seldom reported. Endangerment 1: Not endangered. 2: Endangered in a portion of its range. 3: Endangered throughout its range. Distribution 1: More or less widespread outside California. 2: Rare outside California. 3: Endemic to California (i.e., does not occur outside California). Definitions of occurrence probability: Occurs: Observed on the site by Tierra Madre Consultants personnel, or recorded on-site by other qualified biologists. High: Observed in similar habitat in region by qualified biologists, or habitat on the site is a type often utilized by the species and the site is within the known range of the species. Moderate: Reported sightings in surrounding region, or site is within the known range of the species and habitat on the site is a type occasionally used by the species. Low: Site is within the known range of the species but habitat on the site is rarely used by the species. Absent: A focused study failed to detect the species, or, no suitable habitat is present. Unknown: Distribution and habitat use has not been clearly determined. 7 RJT Bio. Ass., Ogden Environmental & Energy Services Table. 4, Sensitive Insects: RJT Site Species Protective Designation F=Federal, C= California Habitat i Crissal Thrasher F: No designation Favors desert riparian areas with thick shrub/tree Low (thick shrub (Toxostoma dorsale) C: Special Concern cover, mesquite bosques cover, but not native) (Macrobaenetes valgum) Variety of and habitats, Le Conte's Thrasher R No designation often in open, sparsely vegetated areas (e.g. Low (site too close to (Toxostoma /econtei) C: Special Concern Saltbush scrub, sparse urban development, disturbed) Creosote bush scrub), no cactus for nesting)) often nests in cactus Black -tailed F: No designation C: CEQA, Audubon State Mesquite, Creosote Bush Present (observed on Gnatcatcher Watchlist for California and Saltbush Scrub western portion of site (Polioptila melanura) habitats during survey) i Moderate — High Loggerhead Shrike F: Species of Concern Open terrain, grasslands, (Lanius ludovicianus) C: Special Concern scrub habitats (foraging) Table. 4, Sensitive Insects: RJT Site Species Protective Designation F=Federal, C= California Habitat Occurrence Probability Coachella Giant Sand F: Species of Concern Sand dune ridges in Treader Cricket C: No designation Coachella Valley, Absent (Macrobaenetes valgum) favors areas of (no habitat, soil has damp sand for been extensively permanent disturbed) habitation Discussion Potential Impacts of the Proposed Protect Development of the RJT Homes site will result in the loss of biological resources from the 72 -acre site. Since the site has been extensively disturbed due to its former use as an agricultural site, most of the biological value of the site has already been diminished. However, several wildlife species still inhabit or use the site (see Appendix A). Wildlife species currently inhabiting the project site are expected to be displaced to adjacent areas of habitat as a result of project activities, with some small ground -dwelling species potentially lost during construction activities. Many species (particularly birds) will only be affected by loss of foraging habitat. Only one sensitive wildlife species was observed on the site. The Black -tailed Gnatcatchers observed on the project site are considered "Audubon State WatchList" species, but are not listed as threatened or endangered. Black -tailed Gnatcatchers are not expected to be lost due to project activities, but most likely will be dispersed to adjacent areas of habitat. No sensitive plant species or habitats were observed on the site. No other sensitive wildlife species were observed during the survey, and none are expected to occur on the site. RJT Bio. Ass., Ogden Environmental & Energy Services Literature Cited and References Abrams, L. 1923, 1944, 1941. Illustrated Flora of the Pacific States, vol. I -III. Stanford Univ. Press, Stanford, Calif. Abrams, L. and R.S. Ferris. 1960. Illustrated Flora of the Pacific States, vol. IV. Stanford Univ. Press, Stanford, Calif. American Ornithologists' Union. 1998. Check -list of North American Birds, 7th ed. Am. Ornithol. Union, Washington, D.C. California Department of Fish and Game. 1999. La Quinta Quadrangle printout, California Natural Diversity Data Base. England, S. and Nelson, S.G. 1976. Status of the Coachella Valley Fringe -toed Lizard (Uma inornata). Inland Fisheries Administrative Report No. 77-1. Hickman, J.C., ed. 1993. The Jepson Manual: Higher Plants of California. Univ. Calif. Press, Berkeley. Holland, R.F. 1986. Preliminary descriptions of the terrestrial natural communities of California. Calif. Fish Game, Sacramento. Knecht, A.A. 1980. Soil Survey of Riverside County, California, Coachella Valley Area. Soil Conserv. Serv., Washington, D.C. Laudenslayer, W.F., Jr., W.E. Grenfell, and D.C. Zeiner. 1991. A check -list of the amphibians, reptiles, birds, and mammals of California. Calif. Fish and Game 77:109-141. Munz, P.A. 1974. A Flora of Southern California. Univ. Calif. Press, Berkeley. National Geographic Society. 1999. Field Guide to Birds of North America (Third Edition). National Geographic Society, Washington D.C. Skinner, M.W. and B.M. Pavlik. 1994. California Native Plant Society's Inventory of Rare and Endangered Vascular Plants of California, 5th ed. Calif. Native Plant Soc. Spec. Publ. 1. Stebbins, R.C. 1985. A Field Guide to Western Reptiles and Amphibians. Houghton Mifflin Company, Boston. 11 RJT Bio. Ass., Ogden Environmental & Energy Services Vascular Plants Observed on the RJT Homes Site, Riverside County, California (Continued) June 16,2000 MONOCOTYLEDONEAE MONOCOT FLOWERING PLANTS Arecaceae *Phoenix dactylifera Washingtonia frlifera Cyperaceae Cyperus esculentus Poaceae Distichlis spicata *Schismus barbatus Palm Family Date Palm California Fan Palm Sedge Family Nutsedge Grass Family Saltgrass Mediterranean schismus This list reports only plants observed on the site by this study. Other species may have been overlooked or undetectable due to their growing season. Plants were identified from keys, descriptions and drawings in Abrams 1923, 1944, 1951, Abrams and Ferris 1960, Hickman (ed.) 1993, Mason 1957, and Munz 1974. Some specimens were identified or confirmed by Andrew C. Sanders (U.C. Riverside Herbarium). Unless noted otherwise, nomenclature and systematics follows Hickman (ed.) 1993. Where other names are also in use, they are noted in parentheses. SYMBOLS AND ABBREVIATIONS: * = Non-native species. sp.= Plant identified only to genus. ssp. = Subspecies var. = variety 10 Vertebrates Observed or Detected on the RJT Homes Site, Riverside County, California (Continued) June 16, 2000 NL4MMAi S Rabbits and Hares Desert Cottontail Squirrels, Chipmunks, and Marmots California Ground Squirrel MAMMALIA Leporidae Sylvilagus audubonii Sciuridae Spermophilus beecheyi