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C A M B R I A Ms. Lori Duncan November 18,2005 Chemical Analyses: Selected soil samples from the well borings will be analyzed for TPHg, BTEX, fuel oxygenates (MTBE, ethyl tertiary butyl ether, DIPE, tertiary amyl methyl ether, and TBA), 1,2-DCA and ethylene dibromide (EDB) by EPA Method 8260B. Groundwater samples from wells VEW-3 through VEW-6 will be also analyzed for TPHg, BTEX, fuel oxygenates, 1,2- DCA, and EDB. Groundwater samples from the existing wells (MW-1 through MW-13 and VEW-2)will be analyzed per the existing protocol. Wellhead Survey Activities: Following monitoring well installation, a licensed surveyor will survey wellhead elevations relative to mean sea level and the wells' latitude and longitude. © Report Preparation: Following the receipt of analytical results from the laboratory, Cambria will prepare a written report, which will include field procedures,laboratory results, and boring logs. Cambria will perform the scope of work described in this work plan under the supervision of a professional geologist or engineer. Schedule Upon receiving work plan approval from SJCEHD, Cambria will schedule the field work and submit a permit application to SJCEHD. REMEDIAL ACTION PLAN DPE System System Design: The proposed DPE system design includes extraction from existing wells VEW-1 and VEW-2 and proposed wells VEW-3 through VEW-7. A Solleco trailer-mounted electric catalytic oxidizer (Solleco unit) will be used as the extraction and vapor treatment device. Specifically, the Solleco unit will be an ECAT (LR) Series Oxidizer. Solleco unit technical specifications are provided as Attachment C. The Solleco unit is equipped with a liquid-ring pump driven by a 20-horsepower motor. This pump and motor package can generate a vacuum up to 26 inches of mercury and an air flow rate up to 300 cubic feet per minute. A throttle valve will control the applied vacuum and vapor extraction flow rate. The Solleco unit is equipped with auto-dilution and manual dilution valves for additional vacuum and flow control, as well as to maintain oxidizer temperatures within the specified range. Downwell stingers will be set at target elevations at each extraction point. Extracted groundwater and soil vapors will be conveyed through a suction hose passing through an air-tight well seal. The suction hoses will extend from the extraction points to the remediation compound where they will be manifolded into a common header. From the header, the extracted groundwater and soil 7