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0005-233 (SFD) Hydrology CalcsTM -STATE Land Surveyors & Civil Engineers 78-120 Calle Estado Suite 102 La Quinta, California 92253 (760) 564-0271 FAX (760) 564-0279 JOB Lod T"rucrKlo 261324,T71E t-�sT,04CJA SHEET NO. I OF ✓ CALCULATED BY Fa R C-1 C-1 5 DATE 7 - CHECKED BY DATE SCALE (Z 6 (-d Cn .......... ...... .. . ............. ........ &.T ............. ............. ............... . . ..... ..... .............. . .. . .... ..................................... ... . .... ... .... . . . . . . ................ .. . ... ..... ...... ............ .............. .............. ............................ ................. .......... % . ........... ... .... .. OX1p L-14 R. 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PIZ .... ...... ...... .............. ....... . ... .............. ............. . ............. ............. ....... .. ... ..... ...................... .............. ...... ....................... .... -T 70 . .. .... ... . . ...... ...... ............. .............. .......... .......... . ............. ............. . ............. ........ .... .............. ....... ..... .............. .............. .............. ................... ........ 6 4 1 3 1 ............... ..... . I .......... r...:...... ............ .......... ............................. ............ ............. ............. ...... ..... .............. STUW 1, .. .... ........ ... ....... ..... ............. ....... ..... ............. .............. ............. PROOLCT 204.1 (SiNle Statsi 205-1 (PaddMl TRI-STATE Land Surveyors & Civil Engineers 78-120 Calle Estado Suite 102 ` La Quinta, California 92253 '(760) 564-0271 FAX (760) 564.0279 I jos L cr I I T2&C#' Na. 2&524, T1tc ES°T7 s iciA, SHEET NO. Tt OF 7—(9-00 y4 - CALCULATED BY R' (� �+ ► S DATE _ I — (I�y_Q 0 CHECKED BY DATE SCALE - PRODUCT 204.1(S^9k Sheets) 205.1(P900e01 - �Z1 �WQ�l��yl J ,Earth Systems Consultants' 79-8 T 1 B County Club Drive Southern California Y E-ermuda Dunes, CA 92201 (760)345-1588 (800) 924-7015 FAX (760) 345-7315 October 1, 1997= t File No. SS-6620-P1 97-10-703 Tri-State Engineers 78-035 Calle Estado. La Quinta, California 92253 ' Attention: Mr. Dale Grinager r Project: Tract 26524, Lot 30 . -Northeast corner of Heather Glen and Stonegate La Quinta, California , Subject: Percolation Testing for On-site Storm Water Disposal Dear Mr. Grinager. As requested, we have performed infiltration testing for the proposed on-site storm water'retention on the above referenced project. Two tests were performed in the area of the proposed retention basins. The infiltrometer rings were set in place on September, 22, 1957, presaturated on September 23, 1997, with final testing performed on September 24, 1997. Testing was performed in general accordance. with ASTM D 2285 utilizing a double-ring infiltrometer. Test results are as ' follows: Test Inches Per Hour Y. 1 1.7 2 ; 5.8 The infiltration rate provided is an ultimate value and has not hada safety factor applied. Since the water to be- introduced into the system will be primarily stormwater runoff, the potential accumulation of.silt and other debris being washed into the retention basin should be addressed. The site soils consist primarily of very fine to fine grained silty sands with a smallclay fraction. The percolation test was performed at approximate elevation of the .proposed basin bottom. The approximate test location is indicated on the'attached Site Map, Figure 2. The analysis and recommendations submitted .in this report are based in part upon the.data obtained from the two test holes. The nature and extent of variations between the borings may not become evident until construction. If variations then appear evident, it will be necessary to reevaluate the recommendations of this report. :Findings of this report are valid as of this date. However, changes'in conditions of a property can occur with passage of time whether they be due to natural processes or works of man on this or adjacent properties. In addition, changes in applicable or appropriate standards occur whether they result from legislation or broadening of knowledge. Accordingly, findings of this report may be invalidated wholly or partially by changes outside our control. Therefore, this'report is subject to review and should not be relied upon after a period of one (1) year. • October 2, 1997 -2- File No. SS -6620-P1 97-10-703 In the event that any changes in the nature, design or location of the development are planned, the conclusions and recommendations contained in this report shall not be considered valid unless the changes are reviewed and conclusions of this report modified or verified in writing. This report is issued with the understanding that it is the responsibility of the owner, or of his representative, to insure that the information and recommendations contained herein are called to the attention of the architect and engineers for -the project and are incorporated into the plans and specifications for the project. It is also the owners responsibility, or his representative, to insure that the necessary steps are taken to see that the general contractor and all subcontractors cant' out such recommendations in the field. It is, further understood that the owner or his representative.is responsible for submittal of this report to the appropriate governing agencies. Earth Systems Consultants Southern California has prepared this report for the exclusive use of the client and authorized agents. This report has been prepared in accordance with generally accepted soil and foundation engineering practices. No other warranties, either expressed or implied, are made as the professional advice provided under the terms of this agreement, and included in the report. We thank you for the .opportunity to be of service. If any questions arise, or if additional information is desired, please do not hesitate to give us a call. Sincerely, EARTH SYSTEMS CONSULTANTS Southern California Q�EssK,y� L e. a CE38231 Craig S. Hill, C. EXP. 301101 4P C SER/pc OF c AUE°Q Distribution: 2/Tri-State Engineers l/BD File 1/VTA File r EARTH SYSTEMS CONSULTANTS SOUTHERN CALIFORNIA FIGURE 2 File Name: Tri - State File No. SS -6620-F ' i •.. ... �-'. a __ lr..... �.... ............... :.{ 31� p ,.. co � 6° • 32 lam' ' ���� he .... f �• •% \ 50 1 O i � V 0 SM�OCATION well G_... 2 p 2 L, e. r. J.� z We L),) A � I • � I� ,� ' n n 6 tl a�� � 1 • -----�rD�a � - -- -- alai � �1 ; a�• �a ^- Q • •v J •n !�\ .` :===sass n 1 58 'Well --too • ..�.. `��i))`�1\•�\\.,':,lll1' Pump �- 70 . € _ La Quints: ,c��� ,.�_,�:►�,� Fns �.. Base: La Quinta, California quadrangle map photorevised 1980 . N _ 0 2000 ft • I Earth Systems Consultants Southern California Figure 1