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K9 KLEINFELDER • Ethylbenzene by EPA Method 8015M/8021B [non-detect<2,8000 µgdj; • Xylene by EPA Method 8015M/8021B [non-detect< 19,000 µg111; i 1,2-DCA by EPA Method 8260B [non-detect<0.50 µg/1 to 2,000 µg/1]; • EDB by EPA Method 8260B [non-detect<0.50 µg/1 to 890 µg11]; • TBA by EPA Method 8260B [non-detect< 5.0 µg/1]; MTBE by EPA Method 8260B [non-detect< 0.50 µg/1]; • D]PE by EPA Method 8260B [non-detect< 0.50 µg/1]; • ETBE by EPA Method 8260B [non-detect<0.50 µg/1]; and • TAME by EPA Method 8260B [non-detect<0.50 µg/1]. For a summary of analytical data for the analytes listed above, please see Table 2 behind the "Tables"tab of this report. 5.3 SOIL GAS MONITORING The soil vapor extraction system installed by CH2M Hill was replaced by Kleinfelder during 2003 with an air sparging (AS)/high vacuum soil vapor extraction (SVE)/ozone injection system. �. The AS/SVE system consists of a network of two air sparging wells (shallow/deep) and a vapor ` extraction well positioned at five distinct locations, totaling fifteen wells. The ozone injection system consists of a horizontally directional drilled (HDD) conduit for ozone/air transmitted to a system of wells triple-nested at three different depths below groundwater, at five separate locations, equaling fifteen wells. Active remediation began in May 2003 in the source area (actual Disco site) by means of AS/SVE utilizing a thermal/catalytic oxidizer unit. Continual i operation of the thermal oxidizer began in June 2003. In July 2003, the AS/SVE unit was converted from a thermal oxidizer to catalytic oxidizer thereby optimizing the efficiency through fuel uptake. The ozone injection system began consistent operation within the downgradient portion of the plume in September 2003. The system has only been inoperable during periods of system maintenance and enhancements. During the first quarter air samples were collected for the performance evaluation of the catalytic oxidizer on March 23, 2005 which revealed TPH-g and benzene at concentrations of 530 ppmv and 0.85 ppmv respectively at the inlet and 0.44 ppmv and non-detected at the outlet. This was an approximately 37% decrease in TPH-g concentration, and 61% decrease in benzene concentration at the inlet from the previous quarter. The destruction efficiency of the catalytic oxidizer was calculated at 99%. The total estimated pounds of TPH-g removed during Kleinfelder's operation of the system is approximately 17,600 pounds (per date of the sampling). Photoionization detector (PID) readings were logged from VE-1 on January 20, February 24, and April 4, 2005 (no March reading due to unavailable extraction equipment). The PID instrument is a handheld instrument used to measure the overall level of volatile organic compounds in the airstream such as BTEX and hydrocarbons. The PID readings ranged in concentrations from 830 to 1000 before being user-terminated (high levels of VOCs may render the instrument inoperable). 12280.M0N/5T05R613/JZ:Iv Page 10 of 13 0 2005,Kleinfelder,Inc. May 20,2005 t i