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Gtolo&l recknlcs lac. • • Page 4 TRAP-Pilot Test Project No. 425.2 June 14,2005 2.1.1 Post Ozone Sparging Monitoring GTI will monitor and sample the observation wells for a month on a weekly basis after the completion of injection phase to check the post-injection effects. Water will be analyzed for the general field parameters (temperature, pH, DO, ORP & EC) as well as TPH-g, BTEX, MTBE, TBA,TBF, acetone, hexavalent chromium and iron as described above. 2.2 Proposed Soil Vapor Extraction Pilot Testing A Vapor Extraction System (SVE) pilot test will be performed prior to the Ozone Sparge test. The SVE test will be conducted with portable equipment to reduce installation costs. The SVE test will utilize the two vapor wells previously emplaced in the excavation back fill area as described in the Plan (dated March 21, 2005). Extraction will be accomplished with a small Rotron blower with capacity of approximately 100 cfm. Emission treatment will be accomplished by use of two 55-gallon carbon units that will be recycled upon completion. If needed, a permit will be obtained from San Joaquin Valley Unified Air Pollution Control District to operate SVE system before the operation of the system. SVE system will be operated for approximately 24 to 48 hours prior to start of ozone sparging. Air samples (one sample after 10 minutes of operation, one sample after 12 hrs, 24 his and one at the end of operation period) will be taken during this operation to analyze for TPH-g, BTEX and MTBE. In addition, vacuum pressure measurements will be taken from monitoring wells and observation wells surrounding the tank excavation pit (MW-2, 5 & 8; OS-1, OW-1 &2). The SVE system will not be operated during the sparging process. However, SVE system will be operated for 24 hours after the completion of sparging period, and similarly three samples will be collected to compare with the background samples to check for migration of vapors by sparging and the feasibility of SVE system. 3.0 ASSESSMENT OF REMEDIAL EFFECTIVENESS Groundwater samples will be collected as described in Sections 2.1 & 2.1.1 prior to, during and after the ozone injection phase. GTI will analyze all the sample results at the end of pilot testing period to assess the remedial effectiveness of ozone sparging. Similarly, air sample results will be analyzed to evaluate the remedial effectiveness of the SVE system.