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mg <br /> tiM, <br /> b - � <br /> APPENDIX A <br /> BROWN AND CALDWELL WORK PLAN <br /> ATLANTIC RICHFIELD COMPANY, STATION 434 <br /> 501 KETTLEMAN SANE <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 /> California. The work plan will be submitted to ARCO and the San <br /> Joaquin County Environmental Health Department (Count <br /> commencing the work at the site, necessary y) ' Before <br /> pe <br /> and an Underground Storage Tank Unauthorized acquired, <br /> (Leak)/Contamination Site Report (Form HSC 05 <br /> completed. {10/85) ) will be <br /> Boreholes <br /> Brown and Caldwell <br /> (BC) will supervise the drilling of three <br /> bor%,holes and the installation of groundwater monitoring wells in <br /> each of the three boreholes at the site. The locations are shown cn <br /> lw: Figure 1. The boreholes will be drilled using a truck-mounted <br /> drilling rig equipped with 8--inch-outside-diameter, 4-inch-inside- <br /> diameter hollow-stem augers. <br /> The depth to groundwater is approximately 45 feet. Borehole <br /> depth is not expected to be deeper than 60 feet. Soil samples will <br /> be collected at 5-foot intervals. <br /> Soil Sam lin Procedures <br /> :d Soil samples will be taken at the surface and every 5 fee <br /> t during <br /> drilling. Samples will be z�btained using an 18-i ch 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 /> beremoved 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 <br /> h <br /> present, it will be noted. Before sealing, the osoil osampleso willare be <br /> tested for hydrocarbon vapor concentrations using a photofonfzation <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 /> } <br />