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TABLE 10 EXTRACTION AND EMISSION RATES-UNIT I (SL NO 9321) ARCO Facility No 6100 25775 South Patterson Pass Road Tracy,California I Influent Concentration Effluent Concentration Extraction Rate from Emissions Rate to Destruction Removal Cumulative GRO Date Flowrate (mg m) (Mg/M3) Wells(lbsfday) Atmosphere(lbs/day) Efficiency% Removal(lbs) (acfm)' GRO Benzene MTBE GRO Benzene MTBE GRO I Benzene MTBE GRO Benzene MTBF- GRO Benzene Period Total 03/09/04 168 53 2,800 12 51 28 031 041 4242 0 182 077 042 0 005 0 006 9900% 9742% 4242 4242 04/05/04 113 77 1,300 23 1 <0 50 <50 <0 50 <0 50 13 30 0 235 <0 01 <0 51 <0 0051 1<0 0051 >96 16% >97 83% 585 02 627 5/3/2004 1 16046 2,600 57 <1 0 <50 <0 50 <0 50 37 50 0 822 <0 01 <0 72 <0 0072 <0 0072 >98 08% >99 12% 711 20 1,339 06/OM 77 14 4,100 84 <2 5 <50 <0 50 <0 50 28 43 0 583 <0 02 <0 35 <0 0035 <0 0035 >98 78% >99 40% 92366 2,262 07/12/04 75 00 3,300 55 <1 0 <50 <0 50 <0 50 2225 0 371 <0 01 <0 34 <0 0034 <0 0034 >98 48% >99 09% 885 87 3,148 08/02/04 134 35 1,900 29 <1 0 <50 <0 50 <0 50 22 95 0 350 <0 01 <0 60 <0 0060 <0 0060 >97 37% >98 28% 47899 3,627 09/08/04 15069 1,200 20 <1 0 <50 <0 50 <0 50 1625 0 271 <0 01 <0 68 <0 0068 <0 0068 >95 83% >97 50% 72647 4,354 Air Penmt Limits X026 1-0&N.5026 2-0 Either the VOC control efficiency shali not be less than 95% or VOC emissions to atmosphere not to exceed 2 0 lbs/day VOC emissions served by the calal}4ic ovd¢er not to exceed 27 4 lbs/day CINF not sampled and hence results of Influent air sample used for estimated destruction efficiency Corrected for temperature and pressure Sam le Calculations Ext Rate from — 168 53 cuff x 2 800 m x cu meter x Ib x 1 440 min Wells(lbs/day) min cu meter 35 3145 cu fl 453593 mg day 42 42bl sldav Dest Removal = (42 12-0 42)x 10D=99% Efficiency % 4242 ARCO_6100_C&M Page 1 of 1 RATUS i