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1 Report—F,st Phase Remed,al System Page 9 Former Manna Pro Site I Project No 207 3 June 18,2002 Iconversion 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 well MW-1 was measured using an electronically actuated measuring tape accurate to 001 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 Iaboratory data sheets are attached as Appendix A-2 During the ensuing 95 days, the system was checked and serviced at least once each week All of the data parameters described above were measured and recorded In ' addition, the system was serviced by bleeding off any accumulated water from the free- water-knock-out and the sparge compressor's pressure tank The lubricating oil in the compressor was checked and the electricity consumption was monitored The summary ' of the data is attached as Summary Table 3 During the course of the project, the measured vapor extraction rate displayed a generally increasing trend although the vacuum pressure was maintained at about the same level We suspect that the Dwyer digital manometer became somewhat inaccurate and resulted • in an over-measurement of the extraction rates 3.2.2 Air Sparge System Start Up, Operation & Monitoring The air sparge system was started at the same time as the vapor extraction system on February 14, 2002 Initially, the air injection rate was set at 3 scfm During the course of ' the program, the infection rate was raised to as much as 7 scfm, although it was generally kept to less than 5 scfm The rate was checked and record at least once each week The tank of the sparge compressor was drained of any water build-up each week 2937 Veneman Ave, #13240 Geo-Phase Environmental Inc Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295 I