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25 September 1995 <br /> AGE-NC Project No. 95-0100 <br /> Page 3 of 4 <br /> 4. Obtain soil samples at five-foot intervals using a split-tube sampler loaded with three pre- <br /> cleaned brass sleeve. <br /> 5: Preserve soil in the lead brass sleeve by covering both ends with aluminum foil, capping, and <br /> sealing with tape. Label and log soil samples on a chain-of-custody form. <br /> 6. Store the samples under ice and transport the samples in a chilled container to a State certified <br /> laboratory for analysis. Soil samples will be analyzed for TPH-g and BTE&X, in accordance <br /> with EPA methods 5030/8015.and 8020, respectively. <br /> 7. At least one soil sample will be transmitted to a microbiologist and analyzed for <br /> physicochemical properties and microbiological enumeration. <br /> 8. Log auger returns in accordance with the Unified Soil Classification System. <br /> 9. Monitor auger returns and soil sample duplicates for the presence of volatile organics using <br /> a photo-ionization detector (PID) pre-calibrated to isobutylene. <br /> 10. Decontaminate sampling equipment in an alconox solution and rinse twice with water prior <br /> to each sampling run. <br /> 11. Steam-clean auger flights after drilling. <br /> 12. Complete each boring as a soil vapor'extraction well. Each boring will.be duel completed <br /> using 2-inch diameter slotted PVC screen from a depth of 5 to 20 feet and from a depth of <br /> 20 to 35 feet. Blank PVC screen will be used from surface grade to a depth of 5 feet and <br /> from surface grade to a depth of 20 feet. A filter pack will be installed using# 3 sand from <br /> depths of 3 to 35 feet and a bentonite plug will be placed from depths of i to 3 feet. Each <br /> well will then be backfilled to the surface with Portland cement. <br /> 4.2. SOIL VAPOR EXTRACTION PILOT TEST <br /> A portable internal combustion or electric blower-driven system will be set-up on-site and operated <br /> for a period of 8 to 10 hours to determine the subsurface permeability to vapor, radial influence of <br /> the vapor extraction well and the initial hydrocarbon recovery rate. <br /> These parameters will facilitate in the design of the SVE system and will be used to determine the <br /> number of vapor wells, the spacing of the wells and the selection of a vapor remediation system(i.e. <br /> internal combustion, thermal oxidation, etc.). <br /> The selection of a vapor remediation system will be determined by evaluating the concentrations of <br /> extracted hydrocarbon vapor and the estimated supplemental fuel requirements for each of the vapor <br /> remediation systems. The determination of these parameters are absolutely necessary for the design <br />