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S T Hooton <br /> Team Leader r "'f <br /> Environmental Remediation Management <br /> 03 <br /> BP Exploration&Oil Inc <br /> 295 SW 41"Street,Bldg,13,STE N <br /> Renton,WA 98055-4931 <br /> Phone 425-251 0689 <br /> BP OIL Fax 425 251-0736 <br /> December 28, 1999 <br /> San Joaquin County Public Health Services <br /> Attention Mr Harlin Knoll- Environmental Health Division <br /> P O Box 2009 <br /> Stockton,CA 95201 <br /> RE Former BP Oil Site No 11194 <br /> 2375 Tracy Bouevard <br /> Tracy, CA <br /> Dear Mr Knoll <br /> This letter transmits the 1 November 1999 Groundwater Monitoring and Sampling Report prepared on <br /> behalf of BP by Blaine Tech Services The report includes chemical data associated with groundwater <br /> samples obtained on 13 September 1999 <br /> Variable concentrations of MTBE were detected in samples obtained on 13 September 1999, with the <br /> highest concentration reported in samples obtained from well MW-2' Water elevation, MTBE and TPHg <br /> concentration data associated with well MW-2 is shown below <br /> MW-2 TPHg, MTBE &Water Elevation <br /> 25 <br /> 100000 <br /> 20 <br /> 80000 <br /> 15 0 - -TPH-g <br /> 60000 —.1 <br /> a 4 Tosco Purchase U <br /> $/9 —MTBE <br /> 10 Water Elevation <br /> 40000 <br /> 20000 5 <br /> 0 0 <br /> tl- co O O N CO I V �t CO to CO <br /> Go Co 0) Q) O) m 0) co M W, (M M <br /> h X17 <br /> N <br /> CD N r N N N <br /> f <br /> . Note that MTBE concentrations associated with 13 September 1999 samples from well MW-2 were <br /> quantified using Method 8020A(99000 pg/L)and Method 8260B(91000 pg/L) <br />