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Mr Dale Ramey CABRIA January 24, 2000 11� tank A transfer pump will move the water through the filter vessels A new temporary electrical service will be installed to serve the remediation system Groundwater will be pumped from EW-1 at approximately 12 gallons per minute (gpm) The maximum instantaneous rate of discharge to the sanitary sewer will be approximately 30 gpm Cambria proposes to use a silt filter and two, 1,000-lbs carbon vessels in series to treat the ground water before it is discharged to the sanitary sewer GWE System Sampling and Analyses. Cambria will sample the GWE system on a weekly basis for the first month of operation, then monthly 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 (midfluent), and 3)Effluent of the filters The samples will be analyzed by the same analyses that the monitoring wells are analyzed Total petroleum hydrocarbon, calculated as gasoline (TPHg), benzene, toluene, ethyl benzene, and xylenes, (BTEX) by EPA Methods 8015/8020 at a California certified laboratory The samples will also be analyzed for oxygenated fuel additives Methyl tert-Butyl Ether (MTBE), Tertiary Amyl Methyl Ether (TAME), di-Isopropyl Ether (DIPE), Ethyl tert-Butyl Ether . (ETBE), tert-Butanol, and ethanol using EPA Method 8260 Methanol will be analyzed by EPA Method 8015 (modified) GWE Operation and Carbon Changeouts When hydrocarbons are detected in the sample collected from the midfluent sampling location,a carbon changeout will be performed A carbon changeout consists of removing and replacing the activated carbon filter media in the first carbon vessel in series,then placing that vessel as the second vessel in series Schedule Upon receiving written work plan approval from the City of Ripon, Cambria will schedule the startup of the GWE system �i 241-0324 2