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r <br /> A <br /> 1 <br /> I <br /> .^1 r <br /> FA <br /> f. <br /> k <br /> WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 6080 <br /> 85 LOUISE/INTERSTATE 5 <br /> LATHROP, CALIFORNIA <br /> This work <br /> plan has been prepared for Atlantic Richfield Company <br /> (ARCO) Station' 6080, located at 85 Louise/Interstate 51 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 /> _:_ E at the site, all necessary permits will be gacquiredand an <br /> Underground Storage Tank Unauthorized Release (Leak)/Contamination <br /> Site Report (Form HSC 05 (10/851 ) will be completed. <br /> Boreholes <br /> N: <br /> Brown and Caldwell (BC) will supervise the drilling of at least <br /> three boreholes and the installation of groundwater monitoring wells <br /> f #� in each of the boreholes at the site. Locations will be determined <br /> based on the results of the vapor survey. The boreholes will be <br /> drilled using a truck-mounted drilling rig equipped with 8-inch- <br /> outside-diameter, 4-inch-inside-diameter hollow-stem augers. <br /> P The depth. to . groundwater is approximately 12 feet. Borehole s <br /> depth is not expected to be deeper than 35 feet. Soil samples will ? <br /> be collected at 5--foot intervals, formation permitting. <br /> Sail SamplingProce�3ures e <br /> Soil samples will be taken at the surface and every 5 feet during a <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 /> ¢' he fitted into the drive sampler. 3 <br /> p The sampler will be driven into <br /> undisturbed soil to obtain the soil samples. Sample tubes will Then <br /> E' 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 d <br /> i 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. 4 <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 /> - <br /> stored _on__icein -closed__-chests- and- protected-from-meltwater. - - - <br /> cy <br />