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kn KZEINFELDER 1, Overall 1,2-DCA concentrations are continuing to decrease in the groundwater beneath and down gradient of the Disco Facility. From 2004 to 2005 significant 1,2- DCA concentration decreases were observed in down gradient wells MW-DIS-11S, MW-DIS-14S, and MW-DIS-15. A slight increase was observed in MW-DIS-12. Downgradient Wells 2004 (Concentrations), 2005 (Concentrations) MW-DIS-11 S (130 to 200 ug/L) 2005 (7.6 to 22 ug/L) MW-DIS-12 (ND to 1.2 ug/L) 2005 (1.4 to 1.7 ug/L) MW-DIS-14S (1.8 to 3.2 ug/L) 2005 (1.0 to 1.6 ug/L) MW-DIS-15 (1.9 to 7.8 ug/L) 2005 (0.97 to 1.7 ug/L) This report, depth-to-groundwater measurements and laboratory data have been submitted electronically through Geotracker, in accordance with Title 23, Division 3, Chapter 30, Article 2, Sections 3890-3895 of the California Code of Regulations. The electronic submittal of information (ESI) regulations have been adopted by the State Water Resources Control Board (SWRCB). GROUNDWATER TREATMENT SYSTEM OPERATION The soil vapor extraction system installed by CH2M Hill was replaced by Kleinfelder during 2003 with an air sparging (AS)/soil vapor extraction system (VES), as well as an ozone injection system. The ozone injection system began consistent operation within f' the down gradient portion of the plume in September 2003. During operation of the Fourth Quarter 2005, the system was non-operational due to either power outages or equipment repairs. The vapor extraction system (VES) was non operational for 15 days for belt replacement on the blower motor (October 4 to October 5, 2005), and for blower motor replacement (December 19 to December 31, 2005). The ozone air sparging system was non operational for 17 days (November 15 to November 17, 2005, and November 22 to December 5, 2005), due to air compressor repair and quarterly system maintenance. During the Fourth Quarter, air samples were collected on December 9, 2005 for the performance evaluation of the catalytic oxidizer for the ASWES 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 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 last quarter (3,231 pounds TPH- g, and 14.39 pounds benzene) and previous quarters. The total estimated pounds of 12280.M0N15T06R0701CD:Iv Page 2 of 14 ©2006 Kleinfelder, Inc. February 16,2006