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Y <br /> WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 6080 <br /> 85 LOUISE/INTERSTATE 5 <br /> LATHROP, CALIFORNIA <br /> This work plan has been prepared for Atlantic Richfield Company <br /> (ARCO) Station 6080 , located at 85 Louise/Interstate 5, Lathrop, <br /> California. This work plan will be submitted to ARCO, the San <br /> Joaquin County Health Department, and the California Regional Water <br /> Quality Control Board , Central Valley Region. Before commencing work <br /> at the site, all necessary permits will be qacquired and an <br /> Underground Storage Tank Unauthorized Release (Leak) /Contamination <br /> Site Report (Form HSC 05 (10/85) ) will be completed. <br /> Boreholes <br /> Brown and Caldwell (BC) will supervise the drilling of at least <br /> three boreholes and the installation of groundwater monitoring wells <br /> in each of the boreholes at the site . The boreholes will be drilled <br /> using a truck-mounted drilling rig equipped with 4-inch-inside- <br /> diameter , 8--inch-outside-diameter hollow-stem augers. <br /> The depth to groundwater is approximately 12 feet. Borehole <br /> depth is not expected to be deeper than 35 feet. Soil samples will <br /> be collected at 5--foot intervals, formation permitting. <br /> Soil Sampling Procedures <br /> Soil samples will be taken at the surface and every 5 feet during <br /> drilling . Samples will be obtained using an 18-inch-long 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 /> 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 <br /> stored on ice in closed chests and protected from meltwater . <br />