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CALCULATION SHEET F-3 <br /> DUAL-PHASE EXTRACTION TESTING — CRITICAL VELOCITY ANALYSIS <br /> Former Canteen Facility <br /> 1500 Shaw Road <br /> Stockton, California <br /> The critical velocity (CV) for reducing TPH Q <br /> concentrations from 1,000 mg/kg to 1 mg/kg in a <br /> period of one year has been determined to be <br /> 0 010 cm/sec (horizontal flow rate of air through <br /> the subsurface) With this CV, the radius-of- <br /> influence (ROI) may be calculated with the <br /> following equation <br /> ROI = (Q * K)/ (CV * 2 * n * DTW * por ) CV ROI <br /> — SVE <br /> where CVS Well DTW <br /> ROI = Radius-of-Influence (feet) <br /> Q = SVE Well Extraction Flow Rate (ft3lmin) CV ` <br /> • CV = Critical Velocity for Clean-Up (cm/sec) <br /> n = pi (3 14159265) <br /> DTW = Depth to Water or Screen Length in the VE Well (feet) <br /> (minus the length of PVC riser in the well) <br /> por = Air-Filled Porosity <br /> F = Conversion Factor = (2 54 cm/in) * (12 in/ft) /(60 sec/min) <br /> RADIUS-OF-INFLUENCE CALCULATION <br /> CV = 0 010 cm/sec <br /> Q = 39 0 ft3/min <br /> DTW = 30 0 feet <br /> por = 0 40 dimensionless <br /> F = 0 508 cm-min/ft-sec <br /> Radius-of-Influence = 26.28 feet <br /> REFERENCE <br /> 1 A Practical ApprQach to the Desig�lr. Operation. and Monitoring of In-Situ Soil Venting Systems by P C <br /> Johnson, et al <br />