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BCOM2015-0006 Engineering Report & PlansENGINEERING REPORT FOR ONSITE DISPERSAL OF BLOW DOWN WATER FOR THE LA QUINTA AND PALM DESERT COSTO WHOLESALE FACILITIES Prepared by: DAVID DAUWALDER, P.E. RCE 31595 September 4, 2013 Integrated JAIV 2015 CI7-Y COMNjuhl, T,Y L)11 M ENT WASTEWATER * WATER * EN V IROM E N TAL PO Box 10273 Pleasanton, CA 94588 Tel, 925-895-3895 PURPOSE OF DESIGN REPORT 4 Costco Wholesale, the Owner, is proposing to dispose of their cooling tower blow down water at two of their facilities using on -site seepage pits. The two facilities are the La Quinta site. located at 79-795 Highway 111, La Quinta, CA 92253; and the Palm Desert site located at 72 800 Dinah Shore Drive, Palm Desert, CA 9211. The purpose of this Design Report is to establish the basis to allow the design and construction of these two onsite dispersal facilities. BLOW DOWN WATER QUANTITY AND QUALITY Quantity , ` Y At the La Quinta Site, the monthly average volume of blow down water has ranged from 1,785 gallons per day (GPD) from November through April; 2,380 GPD for May and October; and 3,332 GPD from June through September. For the Palm Desert Site, the monthly average volume of blow down water has ranged from 2,382 gallons per day (GPD) from November through March; 3,176 GPD for April, May and October; and 4,049 GPD from June through , September. Quality r s We are proposing to utilize a skid mounted VRTX system to treat the blow,down water before disposal. The VRTX system utilizes a patented Controlled Hydrodynamic Cavitation technology - which facilitates calcium carbonate precipitation. There is also a copper/silver ionizer provided for additional biological control. The copper is measured and controlled to provide a residual of 0.3 mg/I. Under the National Primary Drinking Water Regulations the action level for copper is 1.3 mg/I. The secondary drinking water standards also list copper with an MCL of 1.0 mg/l. Silver is not listed as a primary drinking water standard, but it is'listed as a secondary standard with an MCL of 0.1 mg/l.. The projected'water quality analysis for both the La Quinta and the Palm Desert site's are provided in Attachment ."A". DESIGN BASIS We are using the 75% Load Factor for the VRTX unit as our design basis for the blow down water production rate as shown in Attachment "A". The Design flow for the La Quinta site is projected at 3,570 GPD. The Design flow for the Palm Desert site is projected at 4,764 GPD. ` r We propose to flow the blow down water at each site into a new precast distribution box, with energy dissipater baffles, as necessary for flow under pressure. The flow will be evenly distributed to a field of seepage pits for dispersal. Due to the water quality of the blow down water, no further treatment is proposed. SEEPAGE PIT DESIGN BASIS The United States Department of Agriculture Bureau of Chemistry and Soils performed a Soil Survey of The Coachella Valley Area. In reviewing this Soil Survey, the soils in the western areas of the Coachella Valley include gravelly stony alluvial fans from the mountains. The soils in the Valley are young. Due to the lack of rain in the area very little progress has been made in the development of weathered, structured soil horizons. On the west side of the Valley the mountains consist mainly of hard, gray, massive granite, with some metamorphic igneous rocks. Course textured soils with irregularly spaced horizons of finer textured material are typical, and there is little organic content. For the pit soils we proposed an application rate of 3.0 gallons per day per square foot of pit ' sidewall area. We proposed 6 foot diameter pits, 20 feet deep, with the use of 5 foot diameter precast perforated concrete rings (see following detail). Assuming we have 15 feet of effective depth in the seepage pits, we have a design disposal capacity of 848 GPD. Based on this, La Quinta would need 5 seepage pits; and Palm Desert would need 6 seepage pits. The preliminary configuration is to place these pits with a 10 foot sidewall to sidewall separation. The pits may be placed under pavement provided a traffic bearing lid (H-20 loading) and cover (95% compaction) is provided. We recommend the configuration with the inlet into the top of the cover as shown in the PL-300 Series Seepage pit Liner cut sheet provided in Attachment "B". A Model PL-360 (60" diameter) is proposed, with 1 %" to 2 %Z' clean drain rock provided for the annular space between the concrete rings and open bore hole. K Yh Attachment "A,. t ' VRTX Projected Design Parameters a� N 11 0 RD i v � • gVpJ pp►► � p yQ� 8 • V �/F�� C f� omS_ S : �S}p �pSp � � i• . �i 1R' o 9 O v`, 9i 88.88 0' ci$1s r J02` y` V ,yam y h y tw c a - - - - alto W U, J A - r i ' f . _ Z x,� � 8- t. 2 f.<-- I., qo PROJECT NOTES 1. THIS PROJECT IS AN ONSITE DISPOSAL PROJECT FOR THE EXISTING COSTCO WHOLESALER FOR ITS BLOW DOWN WATER. CURRENTLY THE BLOW DOWN WATER IS DISCHARGING TO THE SEWER. 2. DESIGN PARAMETER: HISTORICALLY THE MONTHLY VOLUME OF HVAC COOLER UNIT BLOW DOWN WATER HAS RANGED FROM 1,785 GALLONS PER DAY (GPD) FROM NOVEMBER THROUGH APRIL; 2,380 GPD FOR MAY AND OCTOBER; AND 3,332 GPD FROM JUNE THROUGH SEPTEMBER. THE ONSITE DISPOSAL BLOW DOWN DESIGN FLOW IS 3,570 GPD. 3. SYSTEM DESIGN: 20 FEET DEEP, 6 FOOT DIAMETER SEEPAGE PITS ARE PROPOSED. A MINIMUM OF 15 VERTICAL FEET OF EFFECTIVE SIDEWALL IS ASSUMED. FIELD VERIFICATION OF COURSE TEXTURED SOILS WITH SOME IRREGULARLY SPACED HORIZONS OF FINER TEXTURED MATERIALS SHALL BE DONE DURING THE FIRST PIT EXCAVATION. THE DESIGN PIT APPLICATION RATE IS 3.0 GALLONS PER DAY PER SQUARE FOOT OF SIDEWALL AREA, OR 848 GALLONS PER DAY PER PIT. WITH THIS, A MINIMUM OF 5 SEEPAGE PITS SHALL BE CONSTRUCTED. PROPOSED AREA OF WORK - SEE SITE PLAN DETAIL 1/C2 APPROVED BY: BY DATE COLEMAN ENGINEERING 1358 BLUE OAKS BLVD, SUITE 200 ROSEVILLE, CA 95678 (916) 791-1188 BAR IS ONE INCH AT FULL SCALE 0 1 IF NOT ONE INCH ON THIS SHEET SCALE ACCORDINGLY �UHC i 1 PROJECT MAP SCALE: 1 "=50' ANO. I REVISIONS I BY I APP I DATE I COSTCO ONSITE BLOW DOWN WATER DISPOSAL COVER SHEET CITY OF LA QUINTA CALIFORNIA ,ko REGIONAL MAPrZ VICINITY MAP FRED WART qG DRIVE MILES AVENUE INDIAN PRINGS COUNT Y CLUB EXISTING COSTCO o0 111 z s ►- UTDOOR RES DRTS ¢ NEW EXIST. COSTCO o OLF COURSE cn Q 48TH AVENUE EIS NHOWER %RANCHO LA QUINTA GOLF CLUB a 49TH AVENUE j (/ 50TH AVENUE I JAN 15 2015 co Irf� 1i . o , 07 V LI r,ni IEN SHEET INDEX 1. COVER SHEET 2. SITE PLAN & DETAILS 3. DETAILS-1 4. DETAILS-2 DE NED UNDER THE DIRECTION OF: 26-- XL�� DA\//ID DAUWALDER R.C..E. No. 31595 - REGISTRATION EXPIRES 12-31-14 DEESIGN: DD DIRAWN: WJ CIHECKED: CC CITY OF LA QUINTA BUILDING & SAFETY DEPT. APPROVE FORCONSTRUCTION naw-q/50&5ayt✓ LL I". JAN 1 5 2015 CITY' F: LA QUINTA COMMUNITY DEVELOPMENT QFtOFESS� SCALE 11-19-14 �c\� DAUk, ti AS SHOWN a DRAWING NUMBER DATE � N 1595 DATE: 11-19-14 2-31-14 C 1 DATE: 11-19-14 q CIV0OF CA, SHEET NUMBER DATE: 11-19-14 11-19-14 1 OF 4 SHEETS N 1 SITE PLAN DETAIL SCALE: 1 "-20' B3AR IS ONE INCH Integrated AT FULL SCALE 0 1" $"Ago w COLEMAN ENGINEERING IF NOT ONE INCH 1358 BLUE OAKS BLVD, SUITE 200 (ON THIS SHEET ROSEVILLE, CA 95678 (916) 791-1 188 SCALE ACCORDINGLY STD ROUND ACCESS COVER MARKED "SEWER" — H-20 TRAFFIC RATED BOX AND LID FINISH SURFACE (E) AC (E) AB 8SEWER PLAN mig 4" THREADED PLUG —18" X 12" CONIC COLLAR 00 4" RISER EXTENDED NATIVE TO 6" BELOW FINISH BACKFILL #10 COPPER SURFACE TRACER WIRE 4" PVC FROM D—BOX a. — a a as a a a. H-20 COVER 2 \MONITORING RISER DETAIL — NO SCALE DISCHARGE PIPE 1 9" MIN IYr SAW CUT LIMITS (TYP) ZTED SAND, 95% 'ACTION NOTES: 1. NATIVE MATERIAL IS NOT ALLOWED AS TRENCH BACKFILL IN PAVED AREAS, 2. PLACE #10 COPPER TRACER WIRE OVER PIPE. 3. AC PAVING SHALL BE 4" MINIMUM AND SHALL MATCH THE DEPTH OF EXISTING AC PAVING. a T-TRENCH DETAIL — NO SCALE CONDUIT STRAP (TYP) PRESSURE TREATED MOUNTING BOARD E X I S T I N G M E T A L R 0 0 F \ 6" 18"t (FIELD VERIFY FIT) 6„ MIN MIN CONDUIT STRAP E X I S T I N G M E T A L R 0 0 F SECTION DISCHARGE PIPE MOUNTING DETAIL NO SCALE JIZED DISCHARGE PIPE 2" X 8" X 2.5'f PRESSURE TREATED MOUNTING BOARD © 10' OC COSTCO ONSITE BLOW DOWN WATER DISPOSAL DE NED UNDER THE DIRECTION OF i 11-19-14 SITE PLAN & DETAILS DAVID DAIJ 1595 - R DATE R.C.E. No. 3595 -REGISTRATION EXPIRES 12-31 -14 DESIGN: DID DATE: 1 1-19-14 CITY OF LA QUIINTA DRAWN: Wi DATE: 1 1-19-14 CALIFORNIA CHECKED: CC DATE: 1 1-19-14 CITY OF LA QUINTA BUILDING & SAFETY DEPT. APPROVED FOR CONSTRUCTION DATE BY o 19 1-SS�O SCALE �� \o EAU o Z AS SHOWN Q % DRAWING NUMBER N 1595 2-31-14 C2 cm ; SHEET NUMBER qTF OF CN \F 1 1-19-14 2 OF 4 SHEETS PYRAMID PR PIT CO` 9" IN' (INSPECTION f 1-1 /2" TO 2-1/2" DRAIN ROCK B PL 360 LABEL - PYRAMID LOGO & PRODUCT IDENTIFIER �T� PLAN (SECTION VIEW) 60" OUTSIDE DIAMETER 52" INSIDE DIAMETER SEEPAGE HOLE (TYP) OCKOUT HOLES (TYP) SECTION A— A \ INTER' TRACER WIRE NLET INTO TOP OF H-20 COVER 3EE DETAIL 2/C2 (STACKED AND INTERLOCKED RINGS, TYPICAL INSTALLATION) 41p PL-360 SHOWN / 1" I O o o O o 0 0 I SEEPAGE FLOW I O O O O O O O I SEEPAGE OPENING IN WALL I I oo0O0o0 I INNER WALL OF RIN I 1 - - - - - - - - - - - - ELEVATION (OUTER VIEW) NOTES 1. CONCRETE OF PORTLAND CEMENIT DESIGN POURED AND VIBRATED TO DEVELOP MINIMUM 4000 PSI AT 28 DAYS. CONCRETE QUALITY AND PORTLAND CEMENT OF TYPE 5 OR EQUIVALENT TO MEEIT SULFATE RESISTANT REQUIREMENTS. PYRAMID STRUCTURAL DRAWINGS AVAILABILE UPON REQUEST. 2. REINFORCING (STEEL RINGS OR FIBER REINFORCED CONCRETE) MAY BE USED FOR HANDLING AND INSTALLATION PUJRPOSES. IT IS NOT REQUIRED FOR STRUCTURAL CONSIDERATIONS. 3. PYRAMID LINER SHOWN. UPON AIPPROVED SUBMITTAL, JENSEN LINER MAY BE USED. PL--360 Series Seepage Pit Liner Desigrn &Installation Notes #%r-r1*n1 nr m r i mrn nrTA 11 NO SSCALE BAR IS ONE INCH Integrated AT FULL SCALE 0 1 COLEMAN IF NOT ONE INCH ENGINEERING ermces� Inc. 1358 BLUE OAKS BLVD, SUITE 200 ON THIS SHEET ROSEVILLE, CA 95678 (916) 791-1188 S3CALE ACCORDINGLY DETAIL 1� ...I o tiubILiu f+ITV AC 1 A A1mmit PLAN VIEW OUT OUT 7 OUTLETS IAPMO APPROVED SELF SEALING QUICK -CONNECTIONS (5 TO BE USED) OUT WIRE FABRIC----' REINFORCEMENT INLET - IAPMO APPROVED SELF SEALING IN QUICK -CONNECTIONS BOTTOM OF OUTLETS - 2" WATER DEPTH IN BOX FOR EVEN DISTRIBUTION OF WASTE TO ALL OUTLETS INVERTS OF ALL OUTLETS ARE LEVEL INLET 1" ABOVE OUTLE' I / \ I 1254 CAST IRON COVER TO GRADE =1111 >1 OUT OPTIONAL SUB -SURFACE COVER TO MINIMUM DEPTH OPTIONAL 30" I.D. RISER VARIABLE TO GRADE OUTLET TO DISPOSAL FIELD OR SEEPAGE PIT 3" CONCRETE SLAB (AS REQUIRED) OR BASE FILL N COMPACT AND LEVEL i BASE D13—e30 DISTRIBUTION BOX & COVER DB-30 INSTALLATION TRACER WIRE —� TYP •`/11=1 I = 1= �I =1 = - 11- III=, II_ - �� = = _^ NOT TO SCA NOTES 1. CONCRETE BOX & COVER OF PORTLAND CEMENT DESIGN, POURED AND VIBRATED TO DEVELOP MINIMUM 4000 PSI AT 28 DAYS. 2. INSTALLATION MAY BE USED IN H-20 TRAFFIC LOCATIONS WITH A MINIMUM EARTH COVER OF 2'-619 . 3. BOX IS ACCEPTABLE TO 8' DEPTH. 4. PYRAMID DISTRIBUTION BC)X SHOWN. UPON APPROVED SUBMITTAL, JENSEN DISTRIBUTION BOX MAY BEE USED. 5. PLACE PIPE LOCATOR "TR;ACER" WIRE AS SHOWN. USE #10 SOLID CORE INSULATED WIRE. unai I C nww uuwn wHi to uibrubHL DETAILS-1 DB-30 Distribution Box Design & Installation DISTRIBUTION BOX DETAIL NO SCALE AIR VACUUM VALVE r u 11; t r BALL VALVE u w 14 w x K v r a 1-1 /2" BRAIDED FLEXIBLE STAINLESS STEEL HOSE EXPANSION JOINT WITH ,. TREADED CONNECTIONS 1-1/ 2" DISCHARGE PIPE � PIPING LAYOUT DETAIL — NO SCALE � • / S t a�4 dy. �� r- P57 (E) 1-1/2- DISCHARGE PIPE ISOLATION VALVE (NORMALLY OPEN NEW 1-1 /2" DISCHARGE PIPE ISOLATION VALVE (NORMALLY CLOSED) —1-1 /2" BRAIDED FLEXIBLE STAINLESS STEEL HOSE EXPANSION JOINT WITH TREADED CONNECTIONS 2 1-1 2" TIE-IN DETAIL NO SCALE COLEMAN ENGINEERING 1358 BLUE OAKS BLVD, SUITE 200 ROSEVILLE, CA 95678 (916) 791-1188 IBAR IS ONE INCH AT FULL SCALE (0 1 IF NOT ONE INCH ON THIS SHEET SCALE ACCORDINGLY 1 D CMU SCREENED WALL NOTE: 1. MOUNT PIPE HIGH ENOUGH TO AVOID BEING CRUSHED BY TRASH COMPACTOR OR GARBAGE TRUCK. BUILDING PIPEILINE ELEVATION NO SCALE COSTCO ONSITE BLOW DOWN WATER DISPOSAL DETAILS-2 CITY OF LA QIUINTA CALIFORNIA ;ATION POINT 11 I I./ -%I 4.JI 11V114 1 V I I, / PVC SCH 40 CITY OF L.,q QUIN A BUILDING & SAFETY DEPT. APPROVED FOR CONSTRUCTION DATE ---_BY DE MED UNDER THE DIRECTION OF: SCALE � 1 1-19-14 oQFtOFEss/p DAUk, AS SHOWN \o tic a o m DAVID D)AUWALDER DATE DRAWING NUMBER R.C.E. Ndo. 31595 - REGISTRATION EXPIRES 12-31-14 N 1595 2-31-14 gTFOFVCA, FoR�� C4 DESIGN: DID DATE: 1 1 -19-14 DRAVAVN: WJ DATE: 11-19-14 SHEET NUMBER CHECKED: CC DATE: 1 1-19-14 1 1-19-14 4 OF 4 SHEETS