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s _ Rifs <br /> WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 434 <br /> 501 KETTLEMAN LANE <br /> LODI, CALIFORNIA <br /> This work plan has been prepared for Atlantic Richfield Company <br /> (ARCO) Station 434, located at 501 Kettleman Lane in Lodi, <br /> California. The work plan will be submitted to ARCO and the San <br /> Joaquin County Environmental Health Department (County) . Before <br /> commencing the wort: at the site, necessary permits will be acquired. <br /> - Boreholes <br /> Brown and Caldwell (BC) will supervise the drilling of four to <br /> five boreholes and the installation of groundwater monitoring wells <br /> in three of the boreholes. The locations are shown on Figure 1. The <br /> boreholes will be drilled using a truck--mounted drilling rig equipped <br /> with 8-inch-outside-diameter, 4-inch-inside-diameter hollow--stem <br /> augers. <br /> [ f <br /> The depth to groundwater is approximately 50 feet. Borehole <br /> F -- depth is not expected to be deeper than 70 feet. Soil samples will <br /> t be collected at 5-foot intervals. <br /> Soil Sampling Procedures <br /> Soil samples will be taken at the surface and every 5 feet during <br /> E drilling. Samples will be obtained using an 18-inch split--spoon <br /> drive sampler. Three 2-inch-diameter by 6--inch-long brass tubes will <br /> be fitted into the drive sampler. The sampler will be driven into <br /> undisturbed soil to obtain the soil samples. Sample tubes will then <br /> be removed from the sampler, the ends visually inspected .in the field . <br /> 3 to identify lithology, and capped with aluminum foil and plastic caps <br /> ~' to provide an airtight seal. If visible hydrocarbons or odor are <br /> j present, it will be noted. Before sealing, the soil samples will be <br /> 6 tested for hydrocarbon vapor concentrations using a photoionization <br /> detector. . Lithologic logs will be constructed for each borehole. <br /> Each sample will be labeled on site to show the date, project number, <br /> sample location, and depth interval. The sealed samples :,.ill be <br /> stored on ice in closed chests and protected from meltwater. <br /> - If hydrocarbon odors or signs of hydrocarbon are detected in a <br /> soil sample, selectedsoil samples will be analyzed for benzene, <br /> t0 ene, xylene (BTX) (U S. Environmental Protection Agency (EPA) <br /> Method 8020) , and total petroleum fuel hydrocarbons (modified .EPA <br /> j 8015) . The samples will be delivered to SC's analytical laboratory <br /> in Emeryville within 48 hours of collection, <br /> E <br /> 1111 ptv <br />