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09 April 2002 AGE-NC Project No. 97-0301 _ Page 12 of 14 Purged ground water will be containerized in an on-site 10,000-gallon Baker tank; following the 24-hour pump test, a composite "grab" ground water sample will be collected from the Baker tank to analyze for TPH-g, TPH-d, TPH-k, TPH-mo, BTEX, methanol, ethanol, MTBE, TBA, TAME, f DIPE, ETBE, EDB and 1 ,2-DCA by EPA Methods 8015M, 8020 and 8260M. The purged ground water will be transported under non-hazardous waste manifest off-site to an appropriate disposal facility. 4. 5 . SOIL VAPOR EXTRACTION PILOT TEST I -- Following SVE well installation, an eight-hour SVE pilot test will be performed at the site to determine feasibility of SVE as aremediation alternative. An internal combustion (IC) driven engine l will be used to apply a vacuum on SVE well VW- 1 while wells VW-2, EW- 1 and MW-7 will be 1 utilized as observation points. During the SVE pilot test, SVE operational parameters including soil- gas vapor concentrations, air flow and vacuum measurements will be monitored at Y2-hour intervals 1 utilizing Dwyer Magnehelic vacuum gauges and a photo-ionization detector (PID : Thermo Environmental 580A; 10.0 eV; calibrated to isobutylene) . Soil vapor samples will be collected at two-hour intervals from SVE influent utilizing a hand air- vacuum pump and Tedlar bags and analyzed for TPH-g, BTEX and MTBE from a DHS-certified laboratory. Soil vapor field parameters and analytical results will facilitate the design of an SVE system and will be used to determine a general radius of influence for spacing of SVE wells and the selection of an appropriate SVE system. l 4.6. IN-SITU AIR SPARGING PILOT TEST Following the ground water extraction test, an IAS pilot test will be performed. For performance of an in-situ air sparging (IAS) pilot test, a compressor driven unit will be used to inject air into the subsurface via the IAS well. The IAS pilot test will be operated for a period of 48-hours (2 days). -- IAS well AW- 1 will be utilized as the air injection point during the 48-hour IAS pilot test while wells EW- 1 , VW- 1 , VW-2, MW- 1 , MW-2, MW-3 , MW-4, MW-5 , MW-6 and MW-7 will be utilized as observation points. Several parameters, including air injection rate, vapor concentrations, — groundwater depth and dissolved oxygen will be measured at a minimum of 1 -hour intervals from observation wells. Results of the IAS pilot test will be included in a CAP. 4.7, SOIL VAPOR EXTRACTION/IN-SITU AIR SPARGING PILOT TEST At the conclusion of the IAS pilot test, an eight-hour S VE/IAS pilot test will be performed at the site it - � Advanced GwEnvironmental, Inc.