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19 January 1996 <br /> AGE-NC Project No. 95-0118 <br /> Page 4 of 5 <br /> 12. Steam-clean auger flights after drilling each boring. <br /> 13. The IAS well will be completed using five feet of slotted PVC screen from depths of 45 to <br /> 50 feet bsg. Blank PVC screen will be used from surface grade to 45 feet. Sand will be used <br /> as filter pack from depths of 43 to 50 feet. A five-foot bentonite plug will then be placed <br /> from depths of 38 to 43 feet. IAS well design is illustrated in Figure 3 - Well Deslgir. <br /> 14. The SVE well will be completed using approximately 20 feet of slotted PVC screen from <br /> depths of 15 to 35 feet bsg. Blank PVC screen will be used from surface grade to 15 feet. <br /> Sand will be used as filter pack from depths of 12 to 35 feet and a five-foot bentonite plug <br /> will then be placed from depths of 7 to 12 feet. SVE well design is illustrated in Figure 3. <br /> 15. Analyze selected soil samples for TPH-g and BTE&X in accordance with EPA methods <br /> 8015/5030 and 8020/602, respectively. <br /> 4.2. SOIL VAPOR EXTRACTION/IN--SITU AIR SPARGING PILOT TEST <br /> For performance of an SVE/IAS pilot test, the following procedures will be followed: <br /> 1. A portable internal combustion system will be set-up on-site and operated for a period of 8 <br /> to 10 hours to determine the subsurface permeability for vapor extraction, radius of influence <br /> of the vapor extraction well and the initial hydrocarbon recovery rate. <br /> 2. Parameters will be measured at regular intervals throughout the test. Data will facilitate in the <br /> design of the SVE system and will be used to determine the number of vapor wells, the <br /> spacing of the wells and the selection of vapor remediation system (e.g. internal combustion, <br /> thermal oxidation, etc.). <br /> 3. Remediation well VW-I will be used as the primary extraction well. Well VW-2 and selected <br /> ground water monitoring wells will be used to observe the induced vacuum from VW-1. <br /> 4. Four vapor samples will be collected from the extraction well (VW-1) during the test. <br /> Samples will be collected at approximately two hour intervals. The samples will be collected <br /> in Tedlar bags and stored in a cool container and transported under chain-of-custody to a <br /> State-certified laboratory for analysis. Each vapor sample will be analyzed for TPH-g and <br /> BTE&X in accordance with the appropriate EPA methods. <br /> 5. A compressor-driven unit will be used to inject air into the subsurface using the IAS wells. <br /> 6. Parameters to be measured throughout the IAS pilot test include induced pressure at <br /> monitoring points, sparging rate (discharge rate), vapor concentrations at monitoring points, <br /> depth to ground water in surrounding wells and dissolved oxygen. <br /> 7. Ground water samples will be collected from selected wells prior to initiation of the pilot <br /> study (baseline) and at the completion of the pilot study. Ground water samples will be <br />