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i • <br /> gauge, and a 0-200 degree Fahrenheit temperature gauge The Magnehelic <br /> DP gauge will be used to measure differential pressure across the flow <br /> sensor, which will be used to calculate soil extraction flow The Minihelic <br /> DP gauge and the temperature gauge will used to measure the gauge <br /> pressure and temperature of the extracted soil gas to correct the <br /> calculated soil extraction flow The DP and temperature gauge data will <br /> be collected two to four times per week <br /> 6 2 3 Soil Gas Moisture Removal <br /> A 55-gallon steel container (drum) equipped with a double bung open-top <br /> lid will be used as a moisture knock-out drum This drum will be located <br /> between the flow control and metering manifold and the IC engine The <br /> knock-out drum will remove most of the liquid moisture entrained in t h e <br /> extracted soil gas to prevent the entrained liquid from entering the intake <br /> of the IC engine Large amounts of liquid water entering the intake of the <br /> IC engine could damage the engine <br /> The moisture knock-out drum will be checked at least weekly, especially <br /> during sustained rains, or when the weather remains cold for several days <br /> Any water found in the drum will be pumped out and placed within the <br /> water treatment system already operating at the site <br /> 6 2 4 System Monitoring and Sampling <br /> The VE/AS system will be equipped with a 114-inch diameter brass sample <br /> port that will be located on the inlet of the moisture knock-out drum to <br /> monitor soil gas VOC levels and collect soil gas samples An organic vapor <br /> meter (OVM) will be used to measure VOC levels in extracted soil gas on a <br /> weekly basis Influent and effluent soil gas samples will be collected in <br /> Tedlar® bags from the sample port on a monthly basis These samples <br /> will be analyzed by a state certified analytical laboratory for TPH-G, BTEX, <br /> and MTBE by either modified EPA Method 8015/8020 or EPA Method 8260 <br /> The soil gas flow and chemical analyses data will be used for the following <br /> purposes <br /> • Calculate the quantity of VOCs extracted by the VE/AS system <br /> • Detect possible asymptotic VOC concentrations that could possibly <br /> indicate the end point to the VE/AS project <br /> Frank's One Stop Remedial Action Plan — August 2001 <br /> -20- <br />