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Mr. Robert Cochran - 2 - 12 August 2003 <br /> CChevron Environmental Management Company <br /> shut down the SVE system, due to asymptotic levels of treated contaminants and lack of rebound after <br /> SVE system shutdown <br /> .J 2) I recommend that Chevron conduct computer modeling of the remaining contaminant mass in soil and <br /> groundwater, to determine the pumping rate necessary to maintain hydraulic control and protect <br /> City of Lodi Municipal Well #12 (Well #12), 420 feet southwest of extraction well EX-2 The modeling <br />` — should consider various pumping rates (including no pumping) and locations if soil and groundwater <br /> modeling show no impact to Wel l #12, then the G WE system may also be shut down <br /> 3) Groundwater monitoring will continue after GWE system shutdown, to determine if rebound occurs <br /> During the GWE rebound test, all rnonitonng wells will be sampled quarterly for at least one hydrologic <br /> cycle (one year) If little or no rebound occurs, then Chevron may submit a site closure report <br /> 4) Quarterly groundwater monitoring is required by Regional Board Cleanup and Abatement Order <br /> No 5-00-704 After the soil/groundwater modeling and GWE system rebound test (Comment 2) have <br /> been conducted and the report(s) have been reviewed by Regional Board staff, I recommend <br /> reconsidering Chevron's request to reduce groundwater monitoring, or consider a request for No Further <br /> Action Required at the site <br /> •, 5) The California Registered Geologist listed on the signature page did not sign the Report, as required <br /> by the California Business and Professions Code Submittal of a revised signature page signed by a <br /> California licensed professional engineer or geologist with license number/seal is necessary <br /> ti <br />