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1 <br /> Mr Kyle Christie Project 0805-114 04 <br /> August 7, 1995 <br /> Page 4 <br /> ' SITE REMEDIATION <br /> After obtaining an Authority to Construct Permit (Permit No N-3218-1-0) from the San <br />' Joaquin Valley Unified Air Pollution Control District, the final installation of the <br /> remediation system was completed in September 1994, as depicted on Figure 2. The <br /> system consists of an air sparging-enhanced vapor extraction system with catalytic <br /> oxidation treatment (i e , AIREX KATOX 100) As of the end of the second quarter 1995, <br /> the system utilized one air sparging well (AS-1) and 12 vapor extraction wells (VW-1 <br /> through VW-12) Once approval of the workplan is given by SJCPHS, two additional AS <br />' wells and two additional S VE wells will be installed at the site and will be incorporated into <br /> the system <br />' Initial start-up of the system was conducted on November 8, 1994 As of June 29, 1995, <br /> the system uptime has been approximately 71 percent The 29 percent downtime was due <br /> to start-up adjustments, repair of a faulty dilution air valve that occurred during the fourth <br />' quarter 1994, and replacement of the catalyst due to catalyst centering The catalyst was <br /> replaced on April 1, 1995, and the system was restarted <br /> influent and effluent air samples were collected on April 25, May 25, and June 29, 1995 <br /> (see Table 3) Laboratory results indicate TPHG influent and effluent concentrations of <br /> 12,244 milligrams per cubic meter(mg/m) and 6 5 mg/m3, respectively, on April 25, 1995, <br /> 11,000 mg/m3 and 510 mg/m3, respectively on May 25, 1995, and concentrations of <br /> 5,306 mg/m3 and 449 mg/m3, respectively, on June 29, 1995 These results indicate TPHG <br />' removal rates of 99, 95 4, and 918 percent for the respective dates (see Table 4) Based on <br /> concentrations detected and an average flow rate of 70 cubic feet per minute, the amount <br /> of gasoline removed through the end of the second quarter 1995 is estimated to be <br />' approximately 14,757 pounds or 2,327 gallons <br /> S VE wells VW-1 through VW-12 were all fully opened since start-up until January 3, <br />' 1995 Since then, the system has been operating with VW-5, VW-7, VW-9, VW-11, and <br /> VW-12 closed (see Table 5) The air sparge system has operated in conjunction with the <br /> SVE system <br /> ACTIVITIES PERFORMED DURING THE SECOND QUARTER <br /> 0 Performed quarterly groundwater monitoring <br /> • Compiled and evaluated groundwater monitoring data <br /> sAGN NpjU0805YJ8051140 4cs-95 pas 1 <br /> 1 <br />