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e <br /> WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 434 <br /> 501 KETTLEMAN LANE <br /> LODE, 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 work at the site, necessary permits will be acquired. <br /> Boreholes <br /> i 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 /> it augers. <br /> i <br /> The depth to groundwater is approximately 50 feet. borehole <br /> •depth is not expected to be deeper than 70 feet. Soil samples will <br /> F„ } be collected at 5-foot intervals. <br /> i Soil Sampling Procedures <br /> $A� <br /> Soil samples will be taken at the surface and every 5 feet during <br /> 1Adrilling. Samples will be obtained using an 18-inch split-spoon <br /> ?� drive sampler. Three 2-inch-diameter by 5--inch-long bratubes will <br /> ' be fitted into the drive sampler. The sampler will bess driven into <br /> a 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 /> . 6 to identify lithology, and capped with aluminum foil and plastic caps <br /> to provide an airtight seal, if visible hydrocarbons or odor are <br /> Frapresent, it will be noted. Before sealing, the soil samples will be <br /> g: im, 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 /> t sample location, and depth interval. The sealed samples will be <br /> stored on ice in closed chests and protected from meltwater. 3 <br /> _ -= ----- If hydrocarbon _odors—or .si.gns-..of—hydrocarbon--ar.e.-.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 /> Method 8020) , and total petroleum fuel hydrocarbons (modified EPA <br /> oaf 8015) . The samples will be delivered to BC's analytical laboratory <br /> -, in Emeryville within 48 hours of collection. <br />