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r �ArA ■ruAM /` �A Working to Restore Nature catalytic oxidizer A 400 cfm extraction blower is planned, however, a blower of less than 400 cfm may be substituted The granular activated carbon system will utilize carbon steel canisters, 88" in height and 48" in width, each bearing a load of 2000 lbs of vapor phase carbon The maximum throughput for the canister is 500 CFM The canisters model V2000, will be supplied by Bameby & Sutcliffe Two canisters will be plumbed in series The blower rates, VOC concentrations and residence time will be limited so that the first canister will reduce VOC concentrations to approximately I ppmv A breakthrough criteria defined at 2% LEL effluent concentration at the first canister provides for acceptable loading of the first canister while avoiding increased effluent at the system stack At an influent concentration of 400 ppmv at 400 CFM, the calculated VOC load in the first canister is 51 lbs/day This produces a calculated time to loading of 7 days The system will be monitored at a frequency of two times the loading rate When loading becomes apparent, the effluent from the second canister will be allowed to increase to the limit set in the authority to construct to allow for maximum loading of the carbon When the limit is reached, the carbon will be removed by the supplier and replaced A regenerative blower, not to exceed 400 CFM at 2 inches of Hg, will be used to pull vapors from the wells and through the carbon canisters It will be placed downstream of the carbon canisters to prevent escape of VOC's in the event of a line separation and to avoid compression heat transfer to the carbon Operating Schedule During the initial "shakedown" period, the system will be operated between 8 a m and 5 p m , Monday through Friday When stable operation is achieved, the system will operate on a 24 hr/day, 7 days/week basis It is expected that the soil clean-up operation will last less than 3 years Expected Emission of Air Contaminants Phase 1 Fresh air will be mixed with the soil-gas stream as needed by the automatic dilution system All calculations of energy consumption and emissions are based upon the maximum 200 scfm rates Inlet concentrations are calculated from samples collected during a vapor extraction pilot test Gas samples were analyzed at a state certified laboratory for Total Petroleum Hydrocarbons as gasoline (TPHg) and BTEX 3