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VATIC <br /> , ® 6666 Owens Drive <br /> E:.I @�,fi$ �„ Pleasanton, California 94588 <br /> www.atc-enviro.com <br /> 925.460.5300 <br /> APR 21 2000 Fax 925.463.2559 <br /> A S S O C I A T E S I N C . <br /> ! INVIROiNME-NIAL MEALTH <br /> April 19, 2000 <br /> L <br /> 62503.0003 Task 20 <br /> L <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> L 304 East Weber Avenue, Third Floor <br /> Stockton, California 95202 <br /> 1 <br /> L Attention: Ms. Carol Oz <br /> SUBJECT: WORK PLAN FOR PLUME EVALUATION (REVISED) <br /> L QUIK STOP MARKET NO. 132 <br /> 3555 WEST HAMMER LANE <br /> STOCKTON, CALIFORNIA <br /> Dear Ms. Oz: <br /> 4 On behalf of Quik Stop Markets, Inc., ATC Associates Inc. (ATC) has prepared this work plan to <br /> present a scope and schedule to perform further evaluation of the contaminant plume at Quik <br /> Stop Market No. 132 located at 3555 West Hammer Lane, in Stockton, California (site; Figure <br /> 1). This Work Plan has been prepared based on your letter of February 16, 2000, and our <br /> L telephone conversations of March 9, 2000, and April 11, 2000. The intent of the proposed work <br /> is to demonstrate that the there is not an ongoing release at the site, that the contaminant plume is <br /> • well defined, and that there has been no migration of significant concentrations off-site. <br /> BACKGROUND <br /> LIn 1987, Exceltech installed a vadose monitoring system around the three existing gasoline <br /> underground storage tanks (USTs). In July 1990, vapor was detected in the vicinity of the <br /> gasoline USTs. Subsequent excavation around the product lines indicated the presence of <br /> L hydrocarbon impacted soil. <br /> Between August 23 and September 13, 1990, Exceltech completed an initial site assessment <br /> ILconsisting of the completion of five soil borings (B-1, B-2, B-3, B-4 and B-5) and the installation <br /> of four groundwater monitoring wells (MW-1, MW-2, MW-3 and MW-4). The soil and <br /> groundwater samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg) and <br /> L benzene, toluene, ethylbenzene and xylenes (BTEX) in accordance with EPA test methods 8015 <br /> and 8020, respectively. TPHg was present in at least one soil sample obtained from B-3 and B-5. <br /> BTEX (at least one constituent) was present in at least one soil sample obtained from B-1, B-2, <br /> L B-3, B-5 and MW-1. The maximum TPHg concentration was 460 milligrams per kilograms <br /> • I:Un No QUIKSIOP\QS 132(0003)UEPORTSt2000\WORKPLAN(x-sects d Tv tctxR),m <br /> V <br />