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• • i TABLE 3 SOIL VAPOR MASS REMOVAL RESULTS Former Chevron Service Station 9-0557 139 South Center Street Stockton,California T_EHg Benzene Field Measurementsa i Calculated Calculated Hours Vapor Recorded Calculated Influent Removal Removal Influent Removal Removal Sample Date Operated Vacuum Temp. Flow Rate Flow Rate Concentration Rate Net Cumulative Concentration Rate Net Cumulative ID Sampled (hours) (in.Hg) (deg.F)b (act M) (scfm) (mg/m3) (lbs/day)' (Iles)` (lbs) (mg/m) (lbs/day) (lbs) (lbs) INF-9S 2/4/2002 .5 25 70 33 6 22,000 12.0 0.2 0.2 410 0.2 0.0 0.0 INF-9S 2/4/2002 7.5 25 70 43 8 14,000 9.9 2.9 3.1 250 0.2 0.1 0.11 INF-9S 2/5/2002 22.5 25 70 45 8 9,100 6.7 4.2 7.3 220 0.2 0.1 0.2 INF-9S 2/5/2002 32.5 25 70 44 8 16,000 11.7 4.9 12.2 300 0.2 0.1 0.2 INF-9A 2/6/2002 46.65 25 70 44 8 3,200 2.3 1.4 13.6 230 0.2 0.1 0.3 INF-9A 2/6/2002 53.65 25 70 19 3 790 0.2 0.1 13.7 81 0.0 0.0 0.4 INF-9S 2/6/2002 54.15 25 70 20 3 14,000 4.3 0.1 13.8 140 0.0 0.0 0.4 INF-9S 2!712002 75.8 25 70 47 8 13,000 9.2 8.3 22.0 240 0.2 0.2 0.5 CUMULATIVE POUNDS REMOVED: 22,0 0.5- Explanations 5Explanations in.Hg =Inches of Mercury deg.F =Degrees Fahrenheit acfm =Actual cubic feet per minute scfm =Standard cubic feet per minute(actin divided by actual temperature divided by standard temperature multiplied by standard pressure divided by actual pressure) mg/m' =Milligrams per cubic meter TPHg =Total petroleum hydrocarbons as gasoline lbs =Pounds NA =Not available or not applicable Notes: a =Field measurements are rounded to the nearest whole number b =Vapor temperature assumed to be standard temperature(70 deg F) c =The influent concentration times the average flow rate d =The calculated removal rate times the hours extracted i I LChevro"0557/Reports/CAP/Data Tables/DPE_Resuhs loll I