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Mr. Harlin Knoll <br /> August 27, 1997 <br /> Scope of Work <br /> • Geophysical Tank Location and Boring Clearance -If the location and <br /> orientation of the USTs can be determined by geophysical investigation, <br /> ERM-west will appropriately position soil borings near them. The <br /> geophysical locator will clear all soil borings around the tanks and the <br /> forklift shop for utilities. ERM will also notify Underground Service Alert <br /> to mark all subsurface utility lines prior to drilling. <br /> • UST Soil and Ground Water Sampling - Two soil borings will be drilled <br /> adjacent to each tank to the depth of encountered ground water (10-12 <br /> feet). Within each boring one soil sample will be collected just above the <br /> ground water. During the drilling, the encountered soil will analyzed <br /> with a field organic vapor analyzer for the potential presence of <br /> hydrocarbon compounds. One ground water sample will be collected <br /> using a hydropunch for the boring that is downgradient from the tanks. <br /> Collected soil and ground water samples will be analyzed for total <br /> petroleum hydrocarbons (EPA Method 8015-full range) and benzene, <br /> toluene, ethylbenzene, and xylenes (BTEX) by EPA Method 8020). <br /> • Forklift Shop Soil and Ground Water Sampling - Three soil borings will <br /> be drilled to ground water in the area of the former lube oil storage pad, <br /> south of the Forklift Shop. Three additional borings will be drilled in the <br /> area of the diesel tank, solvent tank, and collection sump, located north of <br /> the shop. Within each boring one soil sample will be collected just above <br /> the ground water level. During the drilling, the encountered soil will be <br /> analyzed with a field organic vapor analyzer for the potential presence of <br /> hydrocarbon compounds. One ground water sample will also be collected <br /> from each of the two areas. The ground water samples will be collected <br /> using a hydropunch from the boring that is downgradient of the two areas. <br /> Collected soil and ground water samples will be analyzed for total <br /> petroleum hydrocarbons (EPA Method 8015-full range) and volatile <br /> organic compounds (EPA Method 8260) <br /> Boring Destruction <br /> All soil borings will be grouted by Gregg Drilling under the direct supervision <br /> of an ERM geologist. The grout slurry will consist of bentonite or neat <br /> cement mixed with approximately 8 gallons water per sack. A tremie pipe <br /> will be used if more than five feet of standing water is measured in the <br /> borehole. Boreholes will be completely filled with grout seal and capped with <br /> cement to grade. <br /> ERM-West/AS/August 27,1997 <br />