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r <br />r <br />�_a <br />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 contaminants and lack of rebound <br />SVE system shutdown. ound after <br />2) I recommend that Chevron conduct computer modeling of the remaining contaminant <br />mass groundwater, to determine the pumping rate necessary to maintain and protect <br />s In soil and <br />hydraulic control <br />City of Lodi Municipal Well #12 (Well #I2), 420 feet southwest ofextractaon well EX -2. The <br />should consider various pumping rates (including no pumping) and locations. If soil andgroundwater ng <br />modeling show no impact to Well #12, then the GWE system may also be shut down. <br />3) Groundwater monitoring will continue after GWE system shutdown, to determine if rebound o <br />During the GWE rebound test, all monitoring wells will be sampled quarterly for at least one h d lors. <br />Y <br />cycle (one year). If little or no rebound occurs, then Chevron may submit a site closure reportralogic <br />b <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 <br />been conducted and the report(s) have been reviewed by Regional Board staff, I recommend )have <br />reconsidering Chevron's request to reduce groundwater monitoring, a request for Na Further <br />Action Required at the site. or consider <br />5) The California Registered Geologist Iisted on the signature page did not sign the Report, as required <br />by the California Business and Professions Codrevq <br />California licensed professional engineer or geologist bwith license number/sea]sed bs re page signed b a <br />necessary. Y <br />