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RESULTS OF VENT-ROI ANALYSIS <br /> 6 IL GAS EXTRACTION RATE CALCULATION FOR UNSEALED SOIL VAPOR EXTRACTION SYSTEM <br /> MANNA PRO site in STOCKTON CA <br /> HIGH VACUUM EXTRACTION TEST' <br /> Weathered Gasoline (contaminant mixture, volatile and biodegradable) <br /> log10 (MW P*) = 1. 34 - 3 . 19 6m <br /> Temperature Constant = 1904 deg K <br /> Liquid Density - 7 q cc <br /> Zero Order Bioremediation Rate Constant = 6. 00 013E-04 lb/cf day <br /> Initial TotalSoil Contaminant Concentration = 1500 ppm <br /> Residual (Non-degradable) Soil Concentration = 1 ppm <br /> i Vertical wells in 6 . 25 inch boreholes, not extending to groundwater, <br /> screened from 35 to 45 feet <br /> 100 by 100 foot plume requires 20 wells, operated simultaneously, <br /> spaced no more than 27 . 3 feet apart in a 4 by 5 array <br /> 1 Thickness of Vented Soil Interval = 10 feet <br /> Slope of log10 (P) vs Distance from Pilot Test = 9 . 229302E-02 per ft <br /> Soil Gas Temperature = 50 de F <br /> Interwell Effective Radius = 15 . 8 eet <br /> 1 Single Well Effective Radius = 18 . 1 feet <br /> Desired Time to Cleanup = 1095 days <br /> Cleanup Goal = 90 % removal <br /> i FLOW REQUIRED FOR SINGLE WELL AT THESE CONDITIONS = 15 scfm <br /> APPLIED VACUUM REQUIRED TO ACHIEVE THIS FLOW = 148 . 5 in. water column <br /> ITAL FLOW REQUIRED FOR MULTIWELL SYSTEM = 228. 14 scfm <br /> i <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> i <br /> i <br /> i <br /> 1 <br /> 1 <br />