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Mz kr <br /> m a is <br /> WORK PLAN <br /> A'T'LANTIC 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 /> „a, California. The work plan will be submitted to ARCO and the San <br /> Joaquin . County Environmental Health to <br /> (Count <br /> -i76 &Lncing • the. work.at.:the site, necessary (County) . Before i <br /> Barehole5 permits,:will be 'acquied.... 1: <br /> Brawn and Caldwell ' <br /> , ($C) 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 /> ; sr1 The depth to groundwater is approximately 50 feet. Borehole <br /> ;. depth is not expected to be deeper than 70 feet. Soil sample;; will <br /> be collected at 5-foot intervals. <br /> Soil Sari lin 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 split-spoon <br /> drive sampler. Three 2-inch-diameter by 6--inch-.long brass rubes will <br /> be fitted into the drive sampler. The sampler will be driven _'into <br /> undisturbed soil to obtain the soil samples. S <br /> be removed .From the sampler, the ends visually iamp�ctedb�ilthen <br /> ent <br /> to idify litholo <br /> gy, and capped ed with aluminum £ n the will <br /> oil end plastic caps <br /> to provide an airtight seal. If visible hydrocarbons or odor are <br /> present, it will be noted . Before sealing, the soil san.ples will be <br /> r tested for hydrocarbon vapor concentrations using a photoionization <br /> detector . Litholagic lags will be constructed fcr each borehole. <br /> =ample locatio <br /> Each sample will be labeled on site to show the date, project number, <br />+� n, and depth interval.. The sealed samples will be <br /> stored on ice in closed chests and protected from meltwater. <br /> I£ hydrocarbon odors or signs of hydrocarbon are detected in a <br /> Soil sample, selected soil samples will be analyzed for benzene <br /> tOluenO, xylene (BTX) (U.S. Environmental ` <br /> Method 8020) , and total petroleum fuel hydrocarbons Agency (Epp) <br /> EA <br />.. 8015) . The samples will be delivered to C's analytical d fiebora tory <br /> in Emeryville within 48 hours of collection, <br /> Y <br /> }yy� <br />.ti <br /> Jj <br />