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1 t Mr Kyle Christie Project 0905-114 04 December 6, 1995 Page 4 destruction efficiency, therefore, the was system was turned off The manufacturer is currently working to correct the problem Once the problem with the system is corrected, the unit will be restarted Percentage Uptime Due to a faulty hour meter, the operational time of the remediation system could not be accurately tracked However, based on the electricity used during the third quarter 1995, the system is estimated to have operated approxunateiy 40 percent of the time The low operational time Lan be attributed to the poor performance of the catalyst in the oxidizer Concentrations and Flow The average flow through the system was 92 cubic feet per minute (cfm) at an average applied vacuum of 25 inches of water column (see Table 4) Analytical reports and chain- of-custody documents are included in Appendix B Analytical results of influent and effluent samples collected on July 17, 1995, indicated that the system was not meeting the required destruction efficiency The manufacturer of the system was contacted to adjust the oxidation temperature in order to attain the required destruction efficiency Subsequently, the temperature was adjusted and a source test was conducted on August 10, 1995 The results of the source test indicated that the equipment was in compliance Influent and effluent air samples were also collected on August 29 and September 22, 1995 (see Table 3) Laboratory results indicate that the soil vapor concentrations have dropped from 11,000 milligrams per cubic meter (mg/m3) ui the second quarter to 4,600 rng/m3 Based on concentrations detected and an average flow rate of 92 Lfm, the amount of gasoline removed through the end of the third quarter 1995 is estimated to be approximately 16,748 pounds or 2,700 gallons The effect of the additional air sparge wells on dissolved phase hydrocarbon concentrations is not yet clear However, analytical results from the next quarter should demonstrate the effectiveness of the two additional air sparge wells Destruction Efficiency The remediation system has had an average TPHG destruction efficiency of 90 percent (see Table 4) This is lower than the permitted minimum required destruction efficiency of 95 percent But the system is in compliance with condition No 14, of the Permit to Operate, which states that the emission rate of volatile organic compounds to the atmosphere should not exceed 40 pounds per day The maximum errussions to the atmosphere during the third quarter has been 5 5 pounds per day Due to the low destruction efficiency, the system was shut off on October 6, 1995 The catalytic oxidizer SACW\PJCW8055080511404ES-951p s i