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ENVIRONMENTAL HEALTH DEPARTMENT <br /> AaU�" <br /> C <br /> SAN JOAQUIN COUNTY <br /> o <br /> Donna K Heran, R E H 5 Unit Supervisors <br /> < Director 304 East Weber Avenue,Third Floor Carl Borgman, R E H S <br /> Al Olsen, R E H S Stockton, Calitorma 95202-2708 Mike Huggins, R E H S , R D I <br /> Program Manager Douglas W Wilson, R E H S <br /> Telephone (209) 468-3420 <br /> Laurie A CutuTe <br /> lla, R E H 5 FaX (2U9) 4640138 Margaret Lagorio R E}-I 5 <br /> - <br /> Program Manager Robert MXlellon, R E H S <br /> Website www sjgov org/ehd/ Jeff Carruesco, R E H S <br /> GIL MOORE PRESIDENT r' <br /> NEW WEST PETROLEUM <br /> 1831 16" STREET r �/� Prr 27 2005 <br /> SACRAMENTO CA 95814 V <br /> RE Shell Branded / New West Gas #1003 RO#/Site Code 1705 <br /> 6437 W Banner Avenue <br /> Lodi, CA 95242 <br /> WORKPLAN Work Plan for Monitoring Well Installation and Interim <br /> Remedial Action <br /> DATED October 17, 2005 <br /> PREPARED BY Apex Envirotech Inc — Michael Sgourakis, R G <br /> STATUS APPROVED with conditions noted below <br /> ADEQUATE AND NECESSARY ELEMENTS OF THE WORKPLAN Health & Safety <br /> Code (H&S) Section 25296 10(c)(3)] <br /> o Install five (5) onsite 6-inch PVC extraction wells for interim ground water <br /> extraction to control current MtBE offsite migration and potential impact to <br /> Community Service Well approximately 700' down gradient and, <br /> Extract and treat contaminated ground water and install piping for <br /> discharge to private agricultural land under appropriate permits, access <br /> agreement, and requirements of CVRWQCB General Order 5-00-119 and, <br /> Install four (4) offsite, down gradient 2-inch monitoring wells in County <br /> right of way at "A-Zone" (depth 5'-25' below ground surface-bgs), "B - <br /> Zone" (40'-50' bgs), and "C-Zones (70'-75' bgs) for lateral and vertical <br /> investigation required by EHD and, <br /> © Collect and analyze at least three soil samples for TPHg, BTEX, seven <br /> oxygenates and, <br /> ® Develop, survey, and add new monitoring wells to existing quarterly <br /> monitoring, sampling, and reporting requirements and, <br /> • Submit a report of findings to EHD <br /> COMMENTS AND CONDITIONS <br /> • EHD re-emphasizes it's concern that the priority for this site is ground <br /> water plume migration control All efforts are to be aimed at maintaining a <br /> ground water extraction rate that exceeds the rate at which the <br /> contaminated ground water is flowing off/away from the site Treatment of <br /> the purge water is secondary to ensuring that the migrating mass in the <br /> . ground water does NOT reach the community drinking water wells <br /> O EHD hereby directs you to sample MW-4A and MW-4B for MtBE, TBA and <br /> TPHg an a weekly basis for at least one month and report those results to <br /> EHD before each subsequent sampling event <br /> I <br />