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WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 434 <br /> a 501 KETTLEMAN LANE ` <br /> 'F <br /> LODI, CALIFORNIA <t <br /> This work plan has been prepared for Atlantic Richfield Company <br /> 'Xi, (ARCO) Station 434, located at 501 Kettleman Lane in Lodi, <br /> w California. The work plan will be submitted to .ARCO and the San <br /> . Joaquin County Environmental Health Department ::(County) . Before' <br /> �-omrnencing.:the .�aark 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 <br /> groundwater monitoring wells <br /> 7 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 /> w The depth to groundwater ;s app.-oximately 50 feet. Borehole r <br /> x3x depth is not expected to be deeper than 70 feet. Soil samples will s <br /> be 'collected at 5-foot intervals. <br /> Soil Sampling Procedures <br /> Soil samples will be taken at the surface and ever,T 5 feet during <br /> drilling. Samples will be obtained using an 18-inch split-spoon ' <br /> drive sampler . Three 2-inch-diameter by 5-inch-long brass tubes will <br /> be fitted into the drive sampler. The sampler wi,ll : be driven .into <br /> 4 <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 /> to identify lithology, and capped with aluminum foil and plastic caps :' <br /> to provide an airtight seal. . If visible hydrocarbons or odor are <br /> present, it will be noted. Before sealing, the soil samples will be <br /> 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 will be 4 <br /> *,ut ` stored on ice in closed chests and protected .from meltwater.. '. <br /> S Ar <br /> j= If bydrocartson odors or_signs_ of hydrocarbon_.._are detected—in---a.-------..._.__ - <br /> � z soil: samples. . selected soil -samples will .he - analyzed for. benzene, s; <br /> At toluene, xylene (BTX) (U.S. Environmental Protection Agency (EPA) <br /> Method 8020) , and total petroleum fuel hydrocarbons (modified EPA ' <br /> 8015) . . The samples will be delivered''to BC's analytical laboratory _ <br /> in Emeryville within 48 hours of collection. z <br /> G: <br />