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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> _ f•..p Donna Heran,REHS <br /> r.` 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> H: •/ < Stockton, California 95205-6232 Robert McClellon,REHS <br /> Jeff Carruesco,REHS,RDI <br /> • c . ;p., Website: www.s ov.or /ehd <br /> ,iKasey Foley,REHS <br /> y� FO, �j 19 9 Linda Turkatte,REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> March 31, 2014 <br /> Charles Miller <br /> Moller Investment Group, Inc. <br /> 6591 Collin Drive, Suite E-11 <br /> Moorpark, CA 93012-1493 <br /> Subject: Former USA Station #10 <br /> 2132 E. Mariposa Road <br /> Stockton, California 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Corrective Action Plan (CAP), dated 30 October 2013, prepared and submitted by your <br /> consulting firm, Environ Strategy Consultants, Inc. (ES), on your behalf for the above-referenced <br /> site. The CAP included the remediation plan to reduce petroleum hydrocarbon concentrations <br /> in the subsurface groundwater to acceptable levels by using a high-vacuum dual phase <br /> extraction (HVDPE) remediation system, in order to meet regulatory closure guidelines under <br /> the Low-Threat Underground Storage Tank Case Closure Policy (LTCP) <br /> In the CAP, ES has proposed a work plan that includes: <br /> • Reducing hydrocarbon concentration in the subsurface groundwater, under regulatory <br /> permits through a five-day HVDPE event at wells S-1; MW-16, and MW-21, located <br /> adjacent and downgradient of the underground storage tanks (USTs); <br /> • Collecting vapor and groundwater samples from S-1, MW-6, and MWA2 and analyzing <br /> the samples for total petroleum hydrocarbons as gasoline (TPH-g), benzene, toluene, <br /> ethyl benzene, xylenes (BTEX) and methyl tertiary-butyl ether (MTBE); soil vapor <br /> samples to be collected during the extraction event at the start, mid-point and <br /> conclusion. Collected samples will be analyzed by a California-certified laboratory; <br /> t✓ <br /> • Notifying the EHD of HVDPE events following CAP report approval; <br /> • Reporting findings from the HVDPE event; the report to include analytical reports and <br /> mass removal calculations and hydrocarbon concentration trends; Groundwater <br /> sampling results will be evaluated to determine if any further HVDPE events are <br /> necessary to meet LTCP requirements. <br />