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Mr. Robert Cochran <br />Chevron Environmental Management Company -2- <br />12 August 2003 <br />shut down the SVE system, due to asymptotic levels of treated <br />SVE system shutdown, contaminants and lack of rebound after <br />2) I recommend that Chevron conduct computer modeling of the remaining <br />groundwater, to determine the pumping rate necessaryto maintain h <br />City of Lodi Municipal Well #! 2 Wel] 412 contaminant mass in soil and <br />� hydraulic control and protect <br />should consider various pumping rates (including O no southwest <br />twest of extraction well EX -2. The modeling <br />modeling show no impact to Well #12, then the GWE system may also be shut down.Pumping) If soil <br />3) Groundwater monitoring will continue after GWE system shutdown, to determine <br />During the GWE rebound test, all monitoring wells will be sampled quarterly cycle (one year). If little or no rebound occurs, then Chevron or at l asst one <br />occurs. <br />9 y for at least one hydrologic <br />may submit a site closure report. <br />4) Quarterly groundwater monitoring is required by Regional Board Cleanup <br />No. 5-00-704. After the soil/groundwater modeling and GWE system reboud to Abatement Order <br />been conducted and the report(s) have been reviewed by Regional Board staff, test (Comment 2) have <br />reconsidering Chevron's request to reduce groundwater monitoring, or consider a r °mmend <br />Action Required at the site. <br />equest far No Further <br />5) The California Registered Geologist listed on the signature page did not signt <br />by the California Business and professions Code. Submittal of a revised signature <br />California licensed professional engineer or geologist with'license he Report, as required <br />cense number/seal is necessary. by a <br />