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Report—Remedial Action Feasibility Page 8 Cutter Lumber—Western Lift Site t GPE Project No 102 3 August 1,2003 ' 3.2 VES/Sparge System Operations The system was in place and operational on June 6, 2003 and the pilot test commenced on June 9, 2003 The main part of the test was completed on June 13, 220, but on the ' suggestion of the County EHD representative, the vapor extraction piping was disconnected from VEW-1 and connected to monitoring well MW-7 for two additional days of pilot testing The well, MW-7 is constructed directly through the former tank pit 3.2.1 Soil Vapor Extraction System Start Up, Operation & Monitoring The vapor extraction system was started at 1100 on June 9, 2003 Shortly after the system start-up, air samples were collected in Tedlar bags from both the influent and effluent sides of the treatment system to verify that the carbon filter was adequately ' removing gasoline constituents from vapor being discharged to the atmosphere Several additional samples were collected for laboratory testing during the course of the pilot test The concentration of gasoline hydrocarbons in the vapor was measured from the same two points with a PID organic vapor meter The air extraction and air sparge rates were measured, as was the vacuum at the casing heads of monitoring wells MW-6, MW-7 and MW-8B, which were temporarily used as air monitoring wells Vapor extraction rates were measured by inserting a pitot tube into the air sampling port up-stream of the Fuji blower The pitot tube was connected to a Dwyer series 475 digital manometer that ' measures the differential pressure A conversion calculator supplied by the manufacturer was used to convert the pressure gradient to air-flow rates, which were recorded In addition, the depth to water in monitoring wells MW-6, MW-7, and MW-8B was measured using an electronically actuated measuring tape accurate to 0 01 feet All of the operating parameters were recorded and a summary is attached in Summary Table 3 The two air samples were transferred to a state-certified analytical laboratory for testing The ' laboratory data sheets are attached in Appendix A-2 During the time the pilot system was in operation, it was checked and monitored at least ' once each day All of the data parameters described above were measured and recorded The summary of the pilot test monitoring data is attached as Summary Table 3 ' 3.2.2 Air Sparge System Start Up, Operation & Monitoring Air sparging commenced at 0930 on June 11, 2003, or approximately 48 hours after the ' vapor extraction system was started The sparge air injection rate was set at 4 scfrn The sparge system was checked and monitored at least one each day that it was in operation The sparge system was monitored with Magnahelic gauges to measure the induced ' positive pressure at the heads of several nearby groundwater monitoring wells ' 2937 Veneman Ave , #B240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto,CA 95356 Fax(209) 569-0295