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Estimated Vapor Extraction Removal Volumes I Volume contaminant rniffafRecovenE Rate Recovered: 1 i Iblhr I i Ibs f I T PHg 166 111 84 6,710 ' Benzene 016 3 84 230 MTBE 00003 00072 1 0 4 1 i E I Assumptions -99% Reduction in 180 days ' -2nd degree parabola removal rate ' The two treatment systems being considered for the site would have some similar features Both systems will require a fenced enclosure with a vehicle gate, a power pole and electric panel, and a connection to existing MW-2 Both systems may require a City of Stockton Building Permit and ' will require -Stanislaus Coty�ir Discharge Permit The option to use a positive displacement blower with vapor phase carbon would incorporate a Rotron EN 606 blower capable of producing up to 70 scfiri at 68-1n-H,0 vacuum A minimum of two, 2,000-1b-capacity vapor phase carbon vessels would adsorb hydrocarbons and fuel oxygenates prior to air being discharged to atmosphere Using the conservative concentrations reported recovered at approximately 70 scfin during Reporting Event 1 (TPHg = 4 66 lb/hr, benzene = 0 16 lb/hr, MTBE = 0 0003 lb/hr), US Filter- ' Westates calculated an initial carbon usage at a rate of approximately 600 lb/day Using the assumptions stated above, carbon usage over the 6-month life of the project would be approximately 36,000 lbs ' The electric catalytic oxidizer is a skid-mounded arilt that includes a high vacuum blower, ' vapor/liquid separator, liquid holding tank and transfer pump, electric oxidizer tank with catalyst cell, heat exchanger, electric panel, and system instruments and controls The proposed unit is a Soleco100 Electric Acetylic Oxidizer (Appendix D) ' Because the purchase cost of the carbon greatly exceeds the capital cost of the catalytic oxidizer (approximately S 43,000), the package urut is clearly the treatment of choice for the initial ' system When concentrations decline sufficiently after 4 to 6 months, the oxidizer can be replace by vapor please carbon to save energy costs ' A cost estimate for the catalytic oxidizer system from purchase thru start-up, is presented in Appendix E 7 s lenvcromenm 1\62577 -Diesel PerAreportslintenm_remb'2 doc