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San Joaquin County DIRECTOR <br /> PQN Donna Heran, REHS <br /> U. cp Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman, RENS <br /> • r y'ice, Mike Huggins, REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,.REHS <br /> Fax: (209)464-0138 .teff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> KELLY ESTERS JUL 2 3 2007 <br /> CHEVRON TEXACO ENVIRONMENTAL MANAGEMENT COMPANY <br /> P O BOX 6012 , ROOM K2236 <br /> SAN RAMON CA 94583-0804 <br /> RE: Chevron Service Station 9-1452 <br /> 334 East Main Street <br /> Ripon, California _ <br /> San Joaquin County Environmental Health Department (EHD) has reviewed the analytical <br /> results from previous and current quarterly groundwater monitoring reports for the above= <br /> referenced site in response to recommendations to reduce the analytical list and sampling <br /> frequency presented by Conestoga-Rovers & Associates (CRA) conveyed in First Quarter <br /> 2007 Status Report and Sampling Reduction Request dated April 18, 2007. <br /> j EHD concurs with CRA's recommendation to remove methanol, ethanol, tertiary-butyl <br /> alcohol (TBA), tertiary-amyl methyl ether (TAME), di-isopropyl ether(DIPE), ethyl tertiary- <br /> butyl ether (ETBE), 1,2-dichloroethane (1,2-DCA), and 1,2-dibroinoethane (EDB) from the <br /> analytical list. Although CRA recommends that all monitoring wells be monitored and <br /> sampled annually for analysis for total petroleum hydrocarbons quantified as gasoline (TPH- <br /> g); benzene, toluene, ethylbenzene, and total xylenes (BTEX); and methyl.tertiary-butyl ether <br /> (MTBE), EHD believes monitoring wells MW-6S and MW-8 need,to be monitored/sampled <br /> semiannually since these two wells are most likely to demonstrate the reoccurrence for <br /> chemicals of concern. The remaining wells may be monitored/sdmpled annually and: <br /> analyzed for TPH-g, BTEX, and MTBE. <br /> If you have any questions regarding this letter, please contact Vicki McCartney at (209) <br /> 468-9852, or by email at vinccartney@sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson, Jr.,PG <br /> Unit IV-Site Mitigation Engineering Geologist <br /> Unit IV- Site Mitigation <br /> c: Michael D. Miller, PG - CRA <br /> James L.L. Barton, PG- CVRWQCB ' <br />