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Mr Ron Rowe A February 1, 2000 Cambria based the initial flowrate and influent concentrations of total petroleum hydrocarbon, calculated as gasoline (TPHg), benzene, toluene, ethyl benzene, and xylenes (BTEX), and methyl tert-butyl ether (MTBE) on the results of the pumping test performed on EW-1 Groundwater will initially be pumped from extraction well EW-1 at approximately 10 gallons per minute (gpm) The maximum instantaneous rate of discharge to the sanitary sewer will be approximately 30 gpm Cambria proposes to initially use a silt filter and two, 1,000-lbs carbon filter vessels in series to treat the ground water before it is discharged to the sanitary sewer Carbon adsorption vessels and associated equipment are located within the treatment area, which is located in a fenced area at the rear of the station An electrical submersible pump will be used to extract the ground water and pump it to a transfer tank A transfer pump will move the water through the silt filter and the carbon vessels The process flow is illustrated in Figure 2, Groundwater System Schematic Cambria will use virgin coconut carbon filter media as supplied by US Filter/ Westates The activated carbon supplier used the flowrate and influent concentrations from the pumping test to estimate carbon usage A printout of the results of the estimate is attached The carbon supplier estimates that the system will use approximately 31 pounds of carbon per day At that rate, each carbon vessel would last approximately 32 days A new electrical service has been installed to serve the remediation system A programmable logic controller (PLC), located in the control panel inside the treatment area, monitors several system parameters, including extraction well water level, transfer tank water level, and system pressure at various points The PLC will provide automatic telephone notification to Cambria staff of any OWE system shutdown or alarm condition GWE System Sampling Cambria will collect samples from the GWE system on the first day of operation, on a weekly basis for the first month of operation, then twice per month thereafter Cambria will collect at least three sets of samples from the extracted groundwater during each event 1) Influent to the two carbon filters, 2)Between the filters (nudfluent), and 3) Effluent of the filters GWE System Analyses The samples will be analyzed for TPHg and BTEX by EPA Methods 801518020, oxygenated fuel additives methyl tert-butyl ether (MTBE), tertiary amyl methyl ether (TAME), di-isopropyl ether (DIPE), ethyl tert-butyl ether (ETBE), tert-butanol, tert-butyl alcohol (TBA), tent-butyl formate (TBF), and ethanol using EPA Method 8260B Methanol and isopropanol will be analyzed by EPA Method 8015 (modified) Cambria and Equiva's contract 241.-0324 2