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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> .O Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> Stockton, California 95205-6232 Robert McClellon,REHS <br /> i r Jeff Carruesco,REHS,RDI <br /> Website: www.sjgov.org/ehd Kasey Foley,REHS <br /> Linda Turkatte,REHS <br /> Phone: (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Ellsaesser,REHS <br /> September 26, 2014 <br /> Mr. Sheldon Teranishi <br /> 1121 Grand Street <br /> Alameda, California 94501-4026 <br /> Subject: Former George's Service <br /> 1600 Durham Ferry Road <br /> Tracy, California 95376 <br /> Dear Mr. Teranishi: <br /> By letter dated 23 September 2014, your consulting firm, Ground Zero Analysis, Inc. (Ground <br /> Zero), proposed a reduction of recording data associated with operation and maintenance <br /> (O&M) of the soil vapor extraction (SVE) and air sparge (AS) systems and the sampling <br /> schedule at the above-referenced site. "In an effort to be more cost effective", Ground Zero <br /> proposed the following: <br /> • Reduce O&M of the SVE/AS system and associated recording activities from twice per <br /> month to monthly; <br /> • Reduce monthly monitoring of dissolved oxygen, temperature, pH, electrical conductivity <br /> and oxidation/reduction potential readings to quarterly to assess the performance and <br /> effectiveness of the SVE/AS system; <br /> • Continue quarterly groundwater monitoring for one year after installing one additional air <br /> sparge well (AS-7) and four vapor extraction wells (VEW-3 through VEW-6); and <br /> • Reduce groundwater monitoring from quarterly to semi-annually after one year of <br /> monitoring the new wells. <br /> San Joaquin County Environmental Health Department approves the reductions listed above as <br /> proposed by Ground Zero. Please contact Vicki McCartney at (209) 468-9852 or by e-mail at <br /> vmccartneyla sicehd.com if you have any questions or comments. <br /> Sincerely, <br /> Victoria L. McCartney, REHS` � Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health 9pecialist Engineering Geologist <br /> c: Mr. Eric L. Price, PG, Ground Zero Analysis, Inc., 1172 Kansas Avenue, Modesto, <br /> California 95351-1526 <br /> Ms. Cori Condon, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />