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I <br /> G <br /> f <br /> 45 East Harding <br /> Page 3 <br /> Regarding the confirmed detection of MTBE in the MW9, which has been destroyed, since the <br /> contaminant has not been detected in any other samples from the surrounding wells, it is unlikely <br /> that the MTBE originated from an off site source. During the destruction of VW3, a soil sample <br /> was collected at approximately 35 feet bgs and which will undergo analysis including MTBE, <br /> though these results may not provide sufficient conclusive information. <br /> Based on PHS/EHD's evaluation of information which is available, it is unlikely that active <br /> 1 <br /> remediation will be necessary. However, additional monitoring wells and groundwater sampling <br /> and monitoring will be required, until sufficient and reliable information is available to suggest that <br /> the groundwater plume has remediated to the cleanup levels as referenced in the Underground <br /> Storage Tank Regulations, Title 23, Division 3, Chapter 16, Article 11 and the remaining soil <br /> contamination does not pose a significant threat to groundwater quality.. <br /> PHS/EHD suggests that you continue revision of the closure request report since at such time in <br /> ii the future that information warrants closure, you will be directed to submit a closure report. <br /> Please submit a work plan to install sufficient groundwater monitoring wells to evaluate <br /> groundwater quality trends. PHS/EHD will continue to work with you and the developers of the <br /> site towards the construction goals. <br /> If you have any questions or wish to schedule a meeting, please contact me at (209) 468-0337. <br /> Donna Heran, Director REHS <br /> Environmental Health Division <br /> a <br /> , La <br /> Mary Meays, Senior REHS Mar9are 9ono, REHS <br /> Site Mitigation Unit Supervisor <br /> MM\45HARDING\A <br /> I cc: Elizabeth Thayer, CVRWQCB <br /> �f cc: Carolyn Lawrence <br /> cc: Steve Pulcheon, Taco Bell <br /> cc: Jeff Moore, Greenwood and Moore <br /> i� <br /> 1 <br /> s <br /> i <br /> i <br /> i <br />