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by . <br /> `00460, <br /> �,+,+,.i <br /> ZZ <br /> Z <br /> Scott T Hooton BP Oil Company <br /> Portfolio Manager Midwest Environmental Services <br /> 295 SW 41"Street <br /> Bldg 13,Suite N <br /> Renton WA 98055 <br /> Switchboard 425/251 0667 <br /> Central Fax 425/251-0736 <br /> October 12, 2001 <br /> Mr Harlin Knoll G� <br /> San Joaquin County Public Health Services G, <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Re Former BP Oil Site No 11 194 -o <br /> 2375 North Tracy Boulevard <br /> Tracy, CA <br /> Direct 425/251 0689 <br /> Cell208 <br /> hoo Dear Mr Knoll <br /> hootonst0bp�bp com om <br /> www by corn <br /> This letter transmits the 9 September 2001 Third Quarter 2001 Groundwater Monitoring <br /> report prepared by Blaine Tech Services on behalf of BP The report summarizes <br /> monitoring data obtained since 1986, including results associated with samples recently <br /> collected on 31 July 2001 This report includes figures showing water elevation and <br /> chemical data associated with the former BP site, former Chevron, and Scotty's <br /> Aromatic petroleum hydrocarbons are associated with four of the monitoring wells <br /> sampled on 31 July 2001which are associated with the former BP site The highest <br /> benzene concentration is associated with a sample obtained from well MW-2 (20 3 Eig/1) <br /> The highest MTBE concentrations associated with the former BP site was detected in a <br /> sample obtained from well AMW-5, located adjacent to the underground storage tanks <br /> These results also show lower MTBE concentrations in offsite well MW-7 (959 µg/) m <br /> comparison with the October 26, 2000 sampling event, when 8,600 µg/ was detected <br /> PHS requested a wotkplan for additional assessment based on rising MTBE concentrations <br /> in monitoring wells located adjacent to the underground storage tanks, as well as the recent <br /> detection of MTBE in offsite well MW-7 Given the declining MTBE concentrations at <br /> this site, BP suggests that continued coordinated quarterly monitoring occur in order to <br /> corroborate these declining concentration trends in lieu of a workplan for additional <br /> investigation <br /> A* <br />