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_ � m£: <br /> ♦ 1 ,w.',�r.�'. t-rgou , ..�. -"°? • r-- s.r*L;"4 �� 4..a ,,�•.yf '. 1' _ . a <br /> 3 <br /> Site Assessment Report 9 <br /> 1 <br /> , 91 <br /> 5 <br /> April Ap <br /> 139 South Center,Stockton,CA l 5, 1 91 <br /> 14 <br /> TABLE 3-GROUNDWATER SAMPLE ANALYSES RESULTS <br /> MARCH 8,1991 <br /> WELL BENZENE TOLUENE ETHYL- XYLENES TPH-AS- <br /> NO. BENZENE GASOLINE <br /> - MW-1 250 13 62 47 1,400 <br /> KIW-2 140 9.0 07 33 <br /> 290 <br /> MW-3 0.5 ND ND NO ND <br /> MW-4 NO NA ND NU ND <br /> Shown In parts per billion (ppb) <br /> NO Comound not detected at Method Detection Limit(MDL) <br /> Benzene MDL 5 ppb Toluene MDL 5 ppb <br /> Ethyit;enzene MDL .5 ppb Xylenes MDL = .5 ppb <br /> TPH-as-gasollne MDL -c 50 ppb <br /> SIEVE ANALYSIS <br /> Soil samples were collected for physical testing from the saturated zone penetrated by the <br /> borings of monitoring wells, IVW Z and MW-4• Sieve analyses Information derived from these soil <br /> samples,taken from sandy Intervals in the saturated zone approximately 60-feat below grade,are <br /> �-° presented in Appendix G, <br /> �- SUMMARY AND CONCLUSIONS <br /> w.- <br /> Data collected from former Chevron Service Station No.9-0557 indicate that the underlying <br /> sediments consist of clayey sift,silty clays and randy clays,with occasional lenses of gravelly sands. <br /> Groundwater is present at approximately 45-feet below grade,or approximately 32-feet balow sea levet. <br /> The low groundwater water level may be due to a tone of depression caused by municipal well pumping <br /> northeast of the site. The groundwater appears to be In an unconfined condAlon. <br /> GROUNDWATER <br /> TECHNOLOGY,INC. <br />