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s <br /> PUBLIC HEALTH SERVICES <br /> SAN JOAQUIN COUNTY r :z <br /> ENVIRONMENTAL HEALTH DIVISION ` <br /> Karen Furst, M.D., M.P.H., Health Officer * <br /> 304 East Weber Avenue, Third Floor• Stockton, CA.95202 <br /> 209/468-3424 <br /> FILE C <br /> PAUL SUPPLE <br /> ARCO PRODUCTS COMPANY FEB 2 21999 <br /> PO BOX 6549 <br /> MORAGA CA 94570 <br /> Re: ARCO Service Station 2186. Site Code: 1035 y <br /> 3212 N_ California St_ <br /> Stockton, CA 95204 <br /> San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) <br /> reviewed the Quarterly Monitoring Report (QMR)prepared by Pinnacle dated February <br /> 12, 1999. Benzene, Toluene, Xylene, Ethylbenzene (BTEX) and Methyl tert-butyl ether <br /> (MTBE) contaminants were evidenced in Monitoring Wells (MWs) 1 and 4 and in Vapor <br /> Well 3. + <br /> A discrete water sample was collected in MWI at 74.5 feet below surface grade during <br /> the Quarterly Sampling event on 12/14/98 in an attempt to evaluate contamination in the ! <br /> deeper aquifer. Concentrations of BTEX and MTBE in this sample indicate the potential <br /> for contaminant migration below 74.5 feet. The lateral and vertical extent of the <br /> contaminant plume at this site is unknown. <br /> Submit a Work Plan to PHS/EHD to define the lateral and vertical extent of <br /> contamination at this site by March 31,'1999. Include in the Work Plan the information <br /> requested in the PHS/EHD letter sent to you on May 13, 1998. <br /> Contact Carol Oz, Senior REHS at (209)468-3440 if you have questions regarding this <br /> letter. <br /> Donna Heran, REHS, Director <br /> Environmental Health Division <br /> i <br /> Carol Oz, Senior REHS Marg t Lagorio, �HS <br /> Site Mitigation Unit IV Supervisor <br /> cc: CVRWQCB-Mark List <br /> EMCON-Jay Johnson, Joel Coffman <br /> A Division of San Joaquin Counry Healrh Care Services <br />