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0 <br /> San Joaquin County <br /> o c E <br /> DIRECTORnvironmental Health Department <br /> Donna Heran, REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> ' Jeff Carruesco,REHS, RDI <br /> C4�rFORc��P Website: wwwsjgov.org/ehd Kasey Lada TurlkattREHS <br /> Phone: (209) 468-3420 <br /> e,REHS <br /> Fax: (209)464-0138 <br /> December 20, 2011 <br /> Stephanie McKenna <br /> Chevron Environmental Management Company <br /> 6111 Bollinger Canyon Road, Suite 3652 <br /> San Ramon, CA 94583 <br /> Subject: Unocal #0187/Chevron Site ID 306415 <br /> 437 East Miner Avenue <br /> Stockton, CA 95202 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed First <br /> Semiannual 2011 Groundwater Monitoring and Enhanced Anaerobic Biological Oxidation <br /> Pilot Study Assessment Update (Pilot Study Update) dated October 28, 2011, and a Memo <br /> dated October 10, 2011, submitted on your behalf by Arcadis and has the following <br /> comments. <br /> The Pilot Study Update documents a remedial pilot study test injection of magnesium sulfate <br /> that was conducted at the site during the first quarter of 2011. The objective of the pilot test <br /> was to induce biological oxidation of petroleum hydrocarbons by sulfate reduction. Arcadis <br /> concludes that the objective of the study was achieved, without permanent degradation of <br /> the quality of the groundwater, and proposes to continue the injection program in the first <br /> quarter of 2012. <br /> The EHD agrees with the proposal by Arcadis to have a joint meeting, including the Regional <br /> Water Quality Control Board, to discuss future remedial activities at the site. <br /> If you have any questions please call Lori Duncan at (209) 468-0337 or by email at <br /> Iduncan(@sicehd.com. <br /> Lori Duncan, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: James Barton, CVRWQCB, 11020 Sun Center Drive #200, Rancho Cordova, CA 95670 <br /> Tonya Meyers, Arcadis, 950 Glenn Drive, Suite 125, Folsom, CA 95630 <br />