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I <br /> W <br /> WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 2093, <br /> 3425 TRACY BOULEVARD, <br /> TRACY, CALIFORNIA <br /> s.. This work plan has been prepared for Atlantic Richfield Company <br /> (ARCO) Station 2093 , located at 3425 Tracy Boulevard in Tracy, <br /> California. The work plan will be submitted to ARCO and the San <br /> Joaquin County Environmental Health Department (County) . Before <br /> commencing work at the site, necessary permits will be acquired, and <br /> an Underground Storage Tank Unauthorized Release (Leak)/Contamination <br /> Site Report (Form HSC 05 (10/$5) ) will be completed. <br /> Boreholes <br /> �. Brown and Caldwell (BC) will supervise the drilling of four <br /> boreholes and the installation of groundwater monitoring wells in <br /> each of the four boreholes at the site. The locations are shown on <br /> Figure 1. The boreholes will be drilled using a truck--mounted <br /> drilling rig equipped with 8-inch-outside-diameter , 4-inch-inside- <br /> diameter hollow--stem augers. <br /> The depth to groundwater is approximately 14 feet. Borehole <br /> depth is not expected to be deeper than 25 feet. Soil samples will <br /> be collected at 5-foot intervals. <br /> Soil Sampling Procedures <br /> Soil samples will be taken at the surface and every 5 feet <br /> during drilling _ Samples will be obtained using an 18-inch <br /> split-spoon drive sampler . Three 2-inch-diameter by 6-inch-long <br /> brass tubes will be fitted into the drive sampler . The sampler will <br /> be driven into undisturbed soil to obtain the soil samples. Sample <br /> tubes will then be removed from the sampler , the ends visually <br /> inspected in the field to identify lithology, and capped with <br /> *- aluminum foil and plastic caps to provide an airtight seal. If <br /> visible hydrocarbons or odor are present, it will be noted. Before <br /> sealing , the soil samples will be tested for hydrocarbon vapor <br /> concentrations using a photoionization detector . Lithologic logs <br /> will be constructed for each borehole. Each sample will be labeled <br /> on site to show the date, project number , sample location, and depth <br /> interval. The sealed samples will be stored on ice in closed chests, <br /> and protected from meltwater . <br /> If hydrocarbon odors or signs of hydrocarbon are detected in a <br /> soil sample, selected soil samples will be analyzed for benzene, <br /> toluene , xylene (BTX) (U.S. Environmental Protection Agency (EPA) <br />