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Ms Marla D Guenskx <br /> E,,\on C ompany U S A <br /> . MaN 8 1998 <br /> Page 2 <br /> Ground Water Sampling Analytical Results <br /> Ground «ater samples collected from monitoring x%clls MW-1 through MW-8 and vapor (-Ntra.ction <br /> \�cll VEW-3 on March 30, 1998, «ere submitted to Sequoia Analytical for analysis of benzene, <br /> toluene, cth)lbtnzene, and total x)Ienes (BTEX) by EPA Method 8020, total purgeable petroleum <br /> hydrocarbons (TPPM as gasoline by EPA Method 8015 Modaficd, and oxygenated compounds 4vhich <br /> consisted of ethanol, test-butanol, methyl tertiary butyl ether, di-isopropyl ether, ethyl tertiary butyl <br /> ether, and tert-am)1 methyl ether using EPA Method 8250 <br /> Concentrations of BTEX and TPPH as gasoline were not reported above the laboratory reporting limits <br /> in the samples collected Concentrations of MTBE by EPA Method 8250 were reported m monitonng <br /> wells MW-1 through MW-8 ranging from 5 4 µg/L (MW-2) to 190 µg/L (MW-1) A dissolved <br /> benzene concentration map using the March 30, 1998, analytical results is presented as Figure 4 <br /> Cumulative analytical results are summarized in Table 1, and a copy of the laboratory analytical report <br /> for the March 30, 1998, sampling event is presented in Enclosure B <br /> Schedule <br /> Second quarter 1998 ground Nvater sampling is scheduled for June 1998 <br />• Remarks/Sianature5 <br /> 31ne interpretations contained in this report represent our professional opuuons, and are based in part, <br /> on mformation supplied by the client These opinions are based on currently available information and <br /> are arrived at in accordance with currently accepted hydrogeologic and engineering practices at this <br /> time and location Other than tbis, no warranty is implied or intended <br /> Delta recommends that a copy of this report be forwarded to <br /> Mr Mike Infurna Ms Elizabeth Thayer <br /> San Joaquin County Environmental Health California Regional Water Quality Control Board, <br /> Division, Public Health Services Central Valley Region <br /> Post Office Box 2009 3442 Routier Road <br /> Stockton, California 95201 Sacramento, California 95827-3098 j <br />