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WR <br /> r <br /> KLEINFELDER <br /> 3 SCOPE OF WORK <br /> This work plan presants a scope of work to install three onsite ground water monitoring <br /> wells to assess the potential presences of petroleum hydrocarbon in the ground water. The <br /> wells will be triangulated arowid the former USTs. An attempt should be made to place <br /> one monitoring well upgradient and two monitoring wells downgradient of the <br /> undo.-ground storage tank. It is anticipated that the ground water flow is generally to the <br /> north or northeast. The ground water flow direction will be assessed after the wells are <br /> installed. The proposed locations for the monitoring wells are shown on Plate 2. The <br /> actual locations of the wells will be selected in the field. <br /> 3.1 DRILLING OF SOIL BORINGS AND SAMPLING <br /> The three borings will be advanced with a truck-mounted drill rig equipped with 8-inch <br /> hollow stem augers. During the drilling, an experienced environmental geologist will <br /> classify the soil, collect samples, and log the boreholes. Soil samples will be collected at 5- <br /> foot intervas'to the bottom of each boring. Drill cuttings will be contained in 55-gallon <br /> drums,labeled and left onsite. <br /> Soil samples will be collected by advancing the boring to a point immediately above the <br /> sampling depth and thep driving a Modified California Sampler lined with three brass <br /> tubed into the undisturbed soil. The sampler will then be removed from the bottom of the <br /> boring and the bottom (third) tube sealed with teflon and tight fitting plastic caps. The <br /> sealed tube will be immediately stored in an iced cooler. At the end of drilling operations, <br /> select soil samples will be delivered, under chain-of-custody to a state/EPA certified <br /> laboratory (California Analytical Laboratories/E seco). The remaining soil samples will <br /> be retained in refrigerated storage for future reference or analysis, <br /> To minimize crass-contamination, augers and associated equipment will be steam cleaned <br /> r prior to the drilling of each borehole. The sampling equipment will be cleaned with a <br /> trisodium phosphate mash and distilled water rinse prior to the collection of each soil <br /> sample. <br /> F13-90-66 s <br />