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San Joaquin County DIRECTOR <br /> (0. � Environmental Health Department Donna Heran, REHS <br /> ASSISTANT DIRECTOR <br /> 600 East Main Street <br /> Laurie Cotulla. REHS <br /> k �= Stockton, California 95202-3029 <br /> �.•. -;�� PROGRAM COORDINATORS <br /> r Margaret Lagorio, REHS <br /> \q�rFo'R ?' Website: www.sjgov.org/ehd Robert McClellon,REHS <br /> �— Phone: (209) 468-3420 Jeff Carruesco, REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> September 24, 2009 <br /> Mr. Dung Thanh and Ms. Nhuan Le <br /> 2224 Manthey Road <br /> Stockton, California 95206 <br /> Subject: California Stop <br /> 2224 Manthey Road <br /> Stockton, California 95206 <br /> By email dated September 18, 2009, the San Joaquin County Environmental Health <br /> Department (EHD) received a request from your environmental consulting firm, Advanced <br /> GeoEnvironmental, Inc. (AGE), to sample some or all monitoring wells screened between ten <br /> and thirty feet below surface grade (bsg) not already sampled in September. AGE plans to <br /> initiate batch groundwater extraction (GWE) in the fourth quarter 2009, but notes that methyl <br /> tertiary-butyl ether (MTBE) concentrations in MW-3, MW-7, and MW-8 had declined sharply in <br /> September 2009. AGE needs the data prior to implementing GWE. <br /> The EHD concurs with the recommendation by AGE, even though the EHD had approved the <br /> semiannual sampling of MW-3, MW-7, and MW-8, and annual sampling of the remaining five <br /> wells by letter dated June 5, 2009. By email on September 21, 2009, the EHD directed AGE <br /> to sample monitoring wells MW-1, MW-2, and MW-6 prior to the end of the third quarter 2009. <br /> Based on results from the September sampling event will determine whether additional <br /> groundwater sampling is needed during the fourth quarter 2009. <br /> Please contact Vicki McCartney at (209) 468-9852 or by email at vmccartney(a)sjcehd.com if <br /> you have any questions concerning this letter. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Ms. Ally L. Colavita, Advanced GeoEnvironmental, Inc., 837 Shaw Road, Stockton, <br /> California 95215 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central <br /> Valley Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br />