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12 December 1995 <br /> AGE-NC Project No. 95-0184 <br /> Page 5 of 6 <br /> 17. Complete borings MVS'-7 through MW-10 as ground water monitoring wells using 20 feet of <br /> 0.020-inch slotted PVC screen. The proposed monitoring well completion is illustrated in <br /> Figure 4. <br /> 4.2. GROUND WATER SAMPLING <br /> 1. Survey the top of the monitoring well casings to the nearest 1/100th of an inch to determine <br /> the elevations relative to existing wells. <br /> 2. No sooner than 72 hours after installation, measure to the nearest 0.01 foot, the static water <br /> level in all monitoring wells. <br /> 3. Using a dedicated bailer or submersible pump, surge and purge each monitoring well. At least <br /> three well volumes of water will be removed from each well to stabilize temperature, pH and <br /> conductivity; stabilization parameters will be measured at one-gallon intervals. Ground water <br /> samples will be collected using polyethylene disposable bailers; samples will be collected in <br /> 40-m1 VOA vials preserved with hydrochloric acid and 1-liter amber bottles. <br /> 4. Label and log water samples on a chain-of-custody form. <br /> 5. Store the samples in a chilled container and transport under chain-of-custody procedure to <br /> a state-certified laboratory for analysis. Water samples will be analyzed for TPH-g and <br /> BTE&X in accordance with EPA methods 5030/8015m and 602, respectively. Samples from <br /> MW-4, MW-5, MW-6, MW-7, MW-9 and MW-10 will also be analyzed for TPH-d in <br /> accordance with EPA methods 8015m. <br /> 6. Store purged water in 55-gallon DOT drums on-site pending analytical results. <br /> 4.3. SOIL VAPOR EXTRACTION PILOT TEST <br /> The following procedures will be performed for the soil vapor extraction pilot test: <br /> 1. A portable internal combustion extraction system will be set-up on-site and operated for a <br /> period of 8 to 10 hours to determine the subsurface permeability and radial influence of vapor <br /> extraction and the initial hydrocarbon recovery rate. VW-1 will be used as the extraction <br /> point. <br /> 2. Four vapor samples will be collected during the test. Samples will be collected at <br /> approximately 2-hour intervals and measure hydrocarbon concentrations in the extracted <br /> vapors. The samples will then be transported under chain-of-custody to a state-certified <br /> laboratory for analysis. Each vapor sample will be analyzed for TPH-g TPH-d and BTE&X <br /> in accordance with appropriate EPA methods. <br />