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by <br /> Scott T Hooton BP Products North America Inc <br /> Portfolio Manager Group Environmental Management <br /> 295 SW 41"Street <br /> Bldg 13 Suite N <br /> Renton WA 98055 <br /> DSwitchboard 425/257 0087 <br /> Central Fax 425/257-0736 <br /> January 21, 2002 <br /> Mr Harlin Knoll JAN 2 5 2002 <br /> San Joaquin County Public Health Services ENVIRONMENT HEALTH <br /> 304 East Weber Avenue, Third Floor PERMIT/SERVICES <br /> Stockton, CA 95202 <br /> Re Former BP Oil Site No 11 194 <br /> 2375 North Tracy Boulevard <br /> Tracy, CA <br /> Direct 4251251 0689 <br /> Cell 206/335 0689 Dear Mr Knoll <br /> hootonst0bp com <br /> www by com <br /> This letter transmits the 10 December 2001 Fourth 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 30 October 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 three of the monitoring wells <br /> sampled on 30 October 2001 which are associated with the former BP site The highest <br /> benzene concentration is associated with a sample obtained from well MW-2 (11 3 µg/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 (227 µg/) in <br /> comparison with the July 31, 2001 sampling event,when 959 µg/ was detected <br /> PHS requested a workplan 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 />