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A vapor extraction pilot test will be conducted using newly installed vapor extraction wells VEAS-1 • through VEAS-3 Existing groundwater monitor wells will be used as observation points Each pilot test will be conducted in three stages, which will involve extracting soil gas from the vadose zone at three different well head applied vacuums and flow rates Vacuum influence will be monitored at several wells to evaluate the radius of vacuum influence During the pilot test the soil gas oxygen concentration will be monitored using a GasTechTM combustible vapor analyzer The volatile fuel hydrocarbon (VFH) concentration will also be monitored with a flame ionization detector (FID) or photo ionization detector (PID) During each pilot test three soil gas samples will collected in TedlarTM bags for laboratory analysis for volatile fuel hydrocarbons(VFH), BTEX and MTBE using EPA Test Method TO-14 The VEPT will be conducted using vapor extraction pilot test equipment having a blower and associated flow rate and pressure measuring equipment A thermal oxidizer will be utilized to treat the off-gas during the pilot test The VEPT will be performed in general accordance with ATC's Standard Operating Procedure —Soil Vapor Extraction and Air Sparge Pilot Tests,which is included in Appendix A 5.9 Air Sparge Pilot Test An air sparge pilot test (ASPT) will be conducted to evaluate the feasibility of utilizing this technology for remediation of the hydrocarbon-impacted groundwater Additionally, the pilot test data can be used to Edesign the appropriate soil and groundwater remediation system An air sparge pilot test will be conducted at wells VEAS-1 through VEAS-3 Newly installed and lieexisting groundwater monitor wells will be used as observation points The pilot test at each well will be conducted in three stages, which will involve infecting air into the saturated zone at three different flow rates (2, 5, and 10 cfm) Air sparge influence in terms of dissolved oxygen (DO) and groundwater mounding will be monitored at surrounding wells ' The ASPT will be conducted using a compressor, associated flow rate and pressure gauges, DO and water level meters The ASPT be performed in general accordance with ATC's Standard Operating Procedure— Soil Vapor Extraction and Air Sparge Pilot Tests,which is included in Appendix A 5.10 Constant Discharge Aquifer Test q I A constant rate discharge aquifer test will be performed at the site The aquifer test will consist of a step test, pumping test, and recovery test Well EX-1 will be utilized as the pumping well for the test Several surrounding wells will be utilized as observation wells Data collected during the aquifer test will be used to evaluate aquifer hydraulic parameters such as hydraulic conductivity(K), transmissivity(T), and coefficient of storage (S) The data can be used to evaluate groundwater remediation technologies In addition, the aquifer parameters are necessary to evaluate contaminant transport Prior to arriving on site, ATC will obtain the necessary permits to discharge the groundwater extracted from the pumping well into the sewer, or a water holding tank to be delivered to the site for temporary storage EZ 100966SAFSWP ATC Associates Inc S 1EZ Scrve1EZ 1009661Reports1I00966SAFSWP ATC Project No 43 25827 0026 I 11