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Station No. 502, 35 N. Cherokee Lane, Lodi , - Interim Remediation Plan •r Vacuum Pump The air stream containing the extracted soil gas is drawn from the ground and fed through the system by a 100 scfm Sutorbilt vacuum pump. This is a positive displacement pump which automatically maintains a constant volume flowrate against varying pressures. The pump is capable of developing vacuums of 10 inches of mercury or more. The drive motor will r be powered by 220 volt electric service from the station. Equipment Area The equipment includes: 1) An accumulator/water knockout device, 2) A pumping unit, 3) The catalytic incinerator, and 4) An exhaust stack. The L equipment will be mounted on a pad with anchor bolts. The equipment area will be enclosed by chain link fencing for security purposes. Propane Trap Wagon The catalytic incinerator uses propane to fuel areheat burner system which maintains a minimum temperature for the catalyst bed. The propane source is a conventional 490-gallon trap wagon located onsite. The propane will be provided by a local retailer. Actual siting of the wagon will be determined by local Fire Department requirements. Appropriate traffic protection will be installed as needed. i CATALYTIC INCINERATOR The extracted soil vapors will be abated with a 100 scfm EVAX Model 510 catalytic incinerator. The extracted air stream first enters the preheater burner chamber. The air stream from the preheater then enters the catalytic bed where oxidation of the hydrocarbon vapor occurs. The catalyst has a hydrocarbon destruction efficiency of at least 95% when the TVH influent concentration is above 1000 ppm. When the influent concentration is 1000 ppm or lower, the TVH destruction efficiency is 90% or better. Destruction efficiencies in excess of these minimum values ' are commonly measured in the field. Effluent from the incinerator will be released through a 16' stack attached to the unit to minimize local impact. Catalytic incinerators are considered to be Toxics Best Available Control ' Technology (T-BACT) for vapor extraction operations by the Bay Area Air Quality Management District (BAAQMD) , a major trend-setting air district in California. ' Optimum catalytic oxidation occurs in the temperature range between 600 and 10500F. The temperature of the catalyst bed is monitored - 5 -