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• T* 6 <br /> Soil Vapor Extraction Rate Calculations <br /> Cohn Property <br /> 3755 Munford Avenue <br /> Stockton, California <br /> Vapor Flow Thermal Oxidizer Influent <br /> Date Meter Rate Sample Results ( pmv) Extraction Rates (lb/day) Cumulative Extraction Ib <br /> 0$I24/05 1765(Hours) (scfm) TPHg Benzene TPHg Benzene TPHg Benzene <br /> 09/02/05 3949 2184 692 5,800 520 135 1 1 1231 96 <br /> 10/10/05 6307 2358 91 1 5,200 340 160 091 2,680 19 <br /> 11/07/05 8152 1845 917 4,200 140 130 038 3,793 24 <br /> 12/12/05 1,6258 8106 880 1,600 20 47 005 6,786 31 <br /> 01/09/06 2,0752 4494 1041 1,200 090 42 003 7,625 32 <br /> 02106/06 2,7485 6733 990 850 024 28 001 8,613 33 <br /> 03/23/06 3,6798 931 3 1278 630 <0 20 27 001 9,690 33 <br /> 04/21/06 4,3770— 6972 1248 7 850 <0 20 36 T-01 10,604 33 <br /> 05/09/06 4,8046 _ 4276 1734 — 860 <0 20 50 001 11,370 33 <br /> 06/15/06 5,6907 8861 1734 r- 540 <0 20 32 001 12,881 34 <br /> Note 1 Source Test conducted on 8125105 Quarterly calculations do not Include the source test <br /> Note 2 Sample results from the thermal oxidizer Influent used In place of the vapor extraction well manifold <br /> Note 3 "<"Indicates analytical method detection limit, method detection limits are used as stack concentrations to estimate emission rates and DES <br /> Note 4 Analytical results from 03/14/03 are used to extrapolate cumulative totals through 03/31/03 <br /> MWTPHu=90 MW6enzene=78 11 MWMTer=88 15 <br /> Sample Calculations <br /> Iblday=pounds per day <br /> ppmv=parts per million by volume=ft31 1 x106 ft, <br /> scfm=standard cubic feet per minute <br /> Extraction Rate rate=Flow rate(ft3lmin)'concentration(fl31 1 x1 06 ft')-MW(lbllb-mole)1384 5(f(3/lb-mole}'1440 min/day <br /> ft3=cubic feet <br /> APEX ENVIROTECH, INC <br /> Page 1 of 1 COH58 001 <br />