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S T Hooton <br /> Team Leader <br /> lj <br /> Envlronmentai Remediation Management <br /> t <br /> BP Exploration&Od Inc <br /> c <br /> 295 SW 411 Street,Bldg,13,5TE N <br /> Renton,WA 98055-4931 <br /> Phone 425 251-0689 <br /> BP OIL Fax 425-251-0736 <br /> s <br /> April 11, 2000 <br /> San Joaquin County Public Health Services <br /> Attention Ms Carol Oz- Senior REHS <br /> 304 East Weber Avenue,Third Floor <br /> Stockton,CA 95202 <br /> RE BP Branded Site No 11193 <br /> 3202 West Hammer Lane <br /> Stockton,CA <br /> Site Code 1129 <br /> Dear Ms Oz <br /> This letter transmits the First Quarter 2000 Groundwater Monitoring report prepared on behalf of BP by <br /> Blaine Tech Services The report summarizes chemical data obtained since 1992, including results <br /> associated with samples recently obtained on January 20,2000 <br /> The report shows that aromatic hydrocarbons were detected in a sample obtained from well MW-2 and <br /> {• MW-7 on January 20,2000 MTBE was detected in samples obtained from all of the wells, with the <br /> highest concentration associated with well MW-2 (5,400 µg/1 by Method 8020 and 3,800 pg/l by Method <br /> 8260) TPHg, MTBE and water elevation data for MW-2 is shown below <br /> MW-2 TPHg, MTBE &Water Elevation <br /> 35000 0 <br /> 30000 -2 <br /> ■ -4 <br /> 25000 <br /> M -6 <br /> - 20000 -8 ■ TPHg <br /> ai ! MTBE <br /> ' 15000 -10 ��Water Bevation <br /> -12 <br /> 10000 <br /> -14 <br /> 5000 O -16 <br /> 0 r� •� -18 <br /> N ee) �r LO 0 W co r— t-- W W O <br /> M M CD 01 67 On cr) GD 6" Q', O) Co <br /> O2 2 2 a) m M Qi 0) O] 0 'm a <br /> (D a a0 :V Y O N " Ql O <br /> � r <br />