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08/05/09 Closure Summary Report submitted this date. <br /> 08/19/09 The EHD discussed the site and the request for Closure with the Regional Water <br /> Quality Control Board, Central Valley Region. They did not agree that the site <br /> was ready for closure because of the undefined offsite MtBE detected in MW-10: <br /> 09/01/09 EHD correspondence sent this date to Shelf requesting either additional work or <br /> preparation of a model to show-the contamination reported in MW-10 is from an <br /> offsite source. <br /> 02/17/10 "Case Closure Denial-Response Letter" submitted to Geotracker by Cambria on <br /> behalf of Shell. The Letter-presents a discussion of MtBE plume attenuation rates <br /> at other sites in San Joaquin County, and again requests case closure. <br /> 08/06/10 "Fate and Transport Modei" submitted to Geotracker and the EHD by Cambria on <br /> behalf of Shell. The most conservative model predicts the. MtBE in the <br /> groundwater reported in well:.MW-10 (approximately 400 feet from the site) will <br /> - degrade to below- the MCL, within 240 feet downgradient of MW-10 in <br /> approximately 14 years. Using theactual current data, the model predicts the <br /> concentration of MtBE would degrade.- to below the MCL within 160 feet <br /> downgradient in approximately 12 years. <br /> . a <br /> r- <br />