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. 0 0 Table 2. Soil Vapor Extraction and Treatment System Effluent Data ARCO Facility 2133, Stockton,California TPH as Gasoline Benzene Effluent Emission Destruction Effluent Emission Destruction Pre-Catalyst Post-Catalyst Total System Flow Concentration Rate Efficiency Concentration Rate Efficiency Date Sampled Tem ( F) Tem (°F) Rate(cfm) (ppmv) Obs/day) rcent) (ppmv) (lbs/da ) (percent) 1/11/95 748 780 100 11 042 98% 0 078 0 002 96% 2/9/95 701 782 80 120 365 75% 027 0 006 95% 3128195 753 771 80 071 002 99% <050 000002 100% 4/4/95 758 754 80 2 1 006 99% <050 000002 100% 5/3/95 653 726 100 56 2 13 88% 032 0 009 97% 5/15/95 644 712 100 8 3 032 97% 0 051 0 002 99% 6/12/95 745 775 100 14 005 99% <050 000003 100% 7/8/95 744 777 100 19 007 99% <050 000047 100% 8/22195 740 943 100 17 065 98% 044 0 013 99% 9/19/95 752 838 100 57 022 99% <050 000047 100% 10/23/95 754 768 100 <50 005 100% <050 000047 100% 11/15/95 756 752 100 <50 005 100% <050 000047 100% 12/15/95 744 697 100 0 000 100% -- __ -- 1/26/96 745 728 100 96 036 92% -- -- -_ 2/14/96 750 802 100 1 004 99% -- -- -- 3/27/96 758 651 100 59 022 41% 10/8/96 742 643 100 06 002 98% -- -- __ TPH=Total Petroleum Hydrocarbons cfm=Cubic feet per minute ppmv=Parts per million by volumne I "--"=Not available or not applicable Emission rates for values reported as ND are calculated using the detection limit Sample calculations Emission rate calculation lbs/day = ("x" ppm/1,000,000) * ("Q" ft'31min)*("M W " lb/ib-mol)*(60 min/hr)*(24 hr/day)*(lb-mo11379 5 ft"3) where 'x" is effluent concentration in ppmv "Q' is the system flow rate in ft"3/min "M W " is the molecular weight in Ib/lb-mol (100 2 for TPH-G, 78 1 for benzene) Destruction efficiency calculation %=((Removal rate,lb/da -Emission rate,lb/day)/(Removal rate,ib/da ))*100