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TO6 • <br /> Soil Vapor Extraction Rate Calculations <br /> Cohn Property <br /> 1 3755 Munford Avenue <br /> Stockton, California <br /> Vapor Flow Thermal Oxidizer Influent <br /> Date Meter Rate Sample Results my Extraction Rates(lb/day) Cumulative Extraction Ib <br /> (Hours) (scfm) TPHg Benzene TPHg Benzene TPHg Benzene <br /> 08/24/05 1765 <br /> 09/02/05 3949 2184 692 5,800 -r 520 135 1 1 1231 96 <br /> 10/10/05 6307 — 2358 - 91 1 5,200 - 340 -- 160 091 2,680 1 19 <br /> 11107/05 8152 11345 - 91 7 4,200 140 _ 130 038 3,793 24 <br /> 12/12/05 1,625 8 - 8106 - 880 1,600 -- 20 - 47 005 6,786 31 <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 /> MWTPHn=90 MWeenzen.=78 11 MWMTaE=88 15 <br /> Sample Calculations <br /> lb/day=poundpound p <br /> s per day <br /> ppmv=parts per million by volume=ft3 11x108 ft3 <br /> scfm=standard cubic feet per minute /-, <br /> Extraction Rate rate=flow rate(ft3lmin)•concentration(ft31 1x106 fl3)•MW(lbllb-moley384 5(ft3llb-mole) 1440 min/day <br /> ft3=cubic feet / <br /> �G <br /> APEX ENVIROTECH, INC <br /> Page 1 of 1 COH01 001 <br />