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k4 KLEINFELDER Ethylbenzene by EPA Method 8015M18021 B [non-detect < 0.50 pg/L]; • Xylene by EPA Method 8015M18021 B [non-detect < 0.50 pg/L]; 1,2-DCA by EPA Method 8260B [non-detect < 0.50 pg/L to 22 pg/L]; • EDB by EPA Method 8260B [non-detect < 0.50 pg/L] • TBA by EPA Method 8260B [non-detect < 5.0 pg/L]; MTBE by EPA Method 8260B [non-detect < 0.50 pg/L]; • DIPE by EPA Method 8260B [non-detect < 0.50 pg/L]; ETBE by EPA Method 82608 [non-detect < 0.50 pg/L]; and • TAME by EPA Method 8260B [non-detect < 0.50 pg/L]. A summary of analytical data is presented in Table 3. 5.3 SOIL GAS MONITORING RESULTS During the Fourth Quarter, air samples were collected on December 9, 2005 for the performance evaluation of the catalytic oxidizer for the ASIVES within the source area. The inlet sample was collected in the mainline prior to entering the catalytic oxidizer, and the outlet sample was collected from the catalytic oxidizer exhaust stack. The laboratory results showed inlet concentrations of TPH-g and benzene at 210 ppmv and 0.098 ppmv, respectively. The outlet results showed concentrations of TPH-g and benzene at 4.6 ppmv and non-detect, respectively. The destruction efficiency of the l catalytic oxidizer was calculated at 98%. The estimated amounts of TPH-g and benzene removed this quarter of operation are 1,208 and 0.39 pounds, respectively. The volumes of TPH-g and benzene estimated removed this quarter reflects a general decrease over fast quarter (3,231 pounds TPH- g, and 14.39 pounds benzene) and previous quarters. The total estimated pounds of TPH-g removed during Kleinfelder's operation of the system are approximately 27,062 pounds (per date of the sampling). In 2005, the catalytic oxidizer removed approximately 12,160 lbs of TPH-g and approximately 42.41 of benzene respectively compared to 2004 results, which showed removal of approximately 5,019 lbs TPH-g and 8.6 lbs of benzene, respectively. In 2005, approximately 240-percent more vapor was removed compared to 2004. Photoionization detector (PID) readings were recorded from VE-1, VE-2, VE-3, VE-4, VE-5, and the mainline leading to the thermal/catalytic oxidizer unit (before and after the dilution valve) on October 28, and December 2, 2005. Two sampling events occurred this quarter because of system maintenance in November. The PID readings ranged from 54 ppmv to 226 ppmv in the VE samples, and 83.6 ppmv to 227 ppmv in the mainline samples. i { 12280.M0NIST06R0701CD:ly Page 11 of 14 0 2006 Kleinfelder, Inc. February 16,2006