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Scott T Hooton <br /> Team Leader <br /> BPAmoco <br /> BP Amoco Oil Corporetlan <br /> 295 SW 41-Street <br /> Bldg t3 Suite N <br /> Renton WA 98055 <br /> 42512510689 <br /> 4251251 0735 FAX <br /> July 13,2000 <br /> San Joaquin County Public Health Services - <br /> Environmental Health Division - <br /> Attention Mr Michael Infurna- Senior REHS = <br /> 1- <br /> 304 East Weber Avenue,Third Floor ry <br /> P O Box 388 -� <br /> Stockton,CA 95201-0388 <br /> RE BP Oil Site No 11192 r`o <br /> 1403 Country Club Blvd —_ <br /> Stockton, CA 95204 <br /> Dear Mr Infurna <br /> This letter transmits the Second Quarter 2000 Groundwater Monitoring report prepared on behalf of BP by <br /> Blaine Tech Services <br /> The enclosed report summarizes chemical data and groundwater elevation measurements collected from <br /> seven wells,beginning during May, 1990 Upon review of the results, you will note that aromatic petroleum <br /> hydrocarbons were detected in samples obtained from wells MW-3 and MW-7 on 11 April 2000 <br /> MTBE was also detected in samples obtained from all of the wells sampled on 1 I April 2000 Concentration <br /> data and water elevation measurements for the three wells with the highest MTBE concentrations associated <br /> with the second quarter 2000 are depicted below <br /> MW-3 TPHg, MTBE&Water Elevation <br /> 100000 0 <br /> 90000 /g4 Tosco Purchases <br /> 60000 Site _5 <br /> 70000 <br /> 60000 -10 -- M - -TPHg <br /> `1ss 50000 ---^4MTBE <br /> 40000 -15 --- Water Elevation <br /> 30400 <br /> 20000 -20 <br /> 10000 - <br /> 0 -25 <br /> N N C7 Cil N7 LD fD cO M O <br /> OI G7 01 df InM 0 M 07 Ol t77 O <br /> +T rn MOS 67 OI T O1 <br /> N C C N <br /> r <br /> r0 <br />