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Work Plan For Plume Evaluation <br /> Quik Stop Market No. 132 <br /> 3555 West Hammer Lane, <br /> Stockton, California <br /> equivalent. The borings will be backfilled to the surface with neat cement slurry after sampling is <br /> completed. <br /> Soil and groundwater grab samples will be analyzed by a California-certified laboratory for TPH-g <br /> by EPA Method 8015K BTEX by EPA Method 8020, and MTBE and other fuel oxygenates by <br /> EPA Method 8260. (Groundwater samples were analyzed for 1,2 dichloroethane (DCA), ethanol, <br /> and methanol during the first quarter 2000 sampling event; none of these compounds were <br /> detected at or above the laboratory detection limits.) <br /> Soil cuttings and decontamination water generated during the investigation will be disposed of <br /> following receipt of the laboratory analytical results. The cuttings and decontamination water will <br /> Cj be transported for disposal or recycling by a licensed hazardous waste hauler. <br /> Task 3.Perform Expanded Well Survey <br /> Further evaluation of the potential receptors will be performed through searching the State GIS <br /> database for drinking water well locations within 5,000 feet of the site. ATC's Work Plan For <br /> Additional Groundwater Investigation dated October 19, 1998 included a well survey for the site. <br /> The well survey was conducted to locate any domestic, municipal, and agricultural wells within <br /> 2,000 feet of Quik Stop No. 132. No drinking water wells were identified within the search <br /> radius. The search radius for drinking water wells will be expanded to 5,000 feet. Information on <br /> drinking water wells identified within this search radius will be presented in our report. <br /> Task 4. Evaluate the Contaminant Plume through Compilation of Cross Sections <br /> A great deal of chemical and stratigraphic data has been collected at the site since investigation of <br /> the USTs began in 1987. Nine wells have been completedatthe site along with an additional 11 <br /> soil borings and 10 soil gas/groundwater probes. This data has been presented in various site <br /> investigation reports and quarterly groundwater monitoring reports through the years. ATC <br /> believes that the vertical and lateral extent of soil and groundwater contamination at the site has <br /> been sufficiently defined by the data previously collected. In order to demonstrate this more <br /> clearly, maps and cross sections will be compiled to graphically present the existing, and new, site <br /> data. <br /> Boring logs, well construction details, and analytical data from the site will be incorporated into <br /> multiple intersecting site cross sections. The cross sections will be of sufficient scale to show <br /> pertinent well details. The locations of the cross sections will be presented on an index map. All <br /> project work will be performed under the direction of a California Registered Geologist. <br /> Task 5. Prepare an Evaluation Report <br /> A report presenting the results of the UST evaluation, the three additional soil borings, the <br /> expanded well survey and the site cross sections and maps will be prepared. The report will <br /> 1:W P�\QUKV0RQ5132(0003)\RHP01kIS\1000\W0RKPLAN(X-m dT.&h*(R) - <br /> 6 <br />