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GEOTECHNICAL <br /> NEIL O. ANDERSON ENVIRONMENTAL <br /> AN D ASSOCIATES INSPECTIONS & TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> May 3, 2004 REr'Tn V C' Posr TENSION DESIGN <br /> NOA Project Number: LE03-3 92 <br /> IP] n <br /> IMMr. Mike PY 2004 <br /> Environmental gr�LTH'IU � <br /> Health Dyartment ENVtn�NMk�ins1 ti <br /> 304 E. WeberAvenue, 3 Floor PERI'�iy <br /> Stockton, CA 95202-2708 <br /> Subject: ADDENDUM, GROUND WATER ANALYTICAL RESULTS <br /> SOIL SUITABILITY STUDY <br /> LOT LINE ADJUSTMENT MS-01-18 <br /> 11130 SOUTH UNION ROAD <br /> MANTECA, CALIFORNIA <br /> Dear Mr. Huggins, <br /> This letter provides information regarding the sampling of the water well for the subject project. The <br /> Soil Suitability Report has been submitted to your office awaiting this water quality information. <br /> Please find a copy of the water quality analysis report from Precision Enviro-Tech Analytical <br /> Laboratory for the sub'gct property. Aaron Mejorado, field technician of our office,took the water <br /> sample from a wate face] t the front of the house on March 23,2004. The sample was kept cool <br /> and transported to thea oratory within 1.5 hours. The water was tested for DBCP and nitrate per <br /> EHD requirements. <br /> The results of the laboratory analysis indicates that DBCP was not detected.Nitrate was detected at <br /> a concentration of 70.5 mg/L-NO3 which is well above the drinking water standard of 45 mg(L-NO3. <br /> Interpretation of high concentration of nitrate in ground-water sample indicates the aquifer in which <br /> the well is drawing maybe impacted by nitrate. Nitrate contamination in ground water commonly <br /> originates from fertilizers, dairies,or percolating septic waste water. It is well known that parts of <br /> the Manteca area experiences ground-water degradation from one or more of these sources. As <br /> mentioned in the Soil Suitability Study,septic systems constructed on the site should be engineered 4� <br /> to reduce nitrates in percolating effluent leaching into the ground water. Our conclusions discussed <br /> in the Soil Suitability Report remain unchanged. <br /> Best regards, <br /> ANDERSON& ASSOC., INC. <br /> �w-D GFO <br /> avid J. elch, M.Sc., Senior Geologist 6 J 0 J- lv (O 0 <br /> CEG-2151, CHG-653 4 p� No. 2151 S <br /> CERTIFIED <br /> ENGINEERING <br /> cc: Syble Evans GEOLOGIST <br /> att: precision analytical report OFC <br /> LODI ■ SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way,1,od,Caffomia 95240 ■209.367.3701 ■ 209.369.4228 0 w .nomdcnon.com <br />