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• Table 5 <br /> Extraction and Emission Rates <br /> ARCO Service Station No. 2168 <br /> 441 West Charter Way, Stockton, California <br /> Extraction Rate Emissions Rate Destruction Cumulative TPHG <br /> Date (lbs Y) lbs/da Efficiency % Removal lbs <br /> TPHG Benzene TPHG Benzene TPHG Benzene Period Total <br /> 1124/97 11854 21 039 00003 997% 9998% 267 267 <br /> 2/20/97 6160 16 0 13 0 002 998% 999% 1240 1507 <br /> 3/20/97 3143 0 4 0 04 0 001 999% 998% 373 1880 <br /> 4116/97 3457 0 2 1 006 0 001 998% 992% 2702 4582 <br /> NC=Not calculated <br /> Mass of TPHG removed and cumulative mass removed calculation are based on analytical <br /> results and average flow rate for the quarter <br /> Air PermIt Limits <br /> DRE shall be at least 95% <br /> Daily TPHG emissions shall not exceed 48 0 lbs <br /> Daily benzene emissions shall not exceed 0 02 lb <br /> Sample Calculations <br /> =23 ft'/mm x 170 mg/ml x 0 028 m'/ft'x I Ib/454 000 mg x 1,440 min/day=0 35 Ib/day <br /> Ob/day) <br /> Dest Removal = 0.35-0.0118 x 100=96 6% <br /> (Efficiency %) 035 <br /> Cum Extraction = 0 13+0.35 lb/day x 15 days = 3 6 Ib <br /> (Period-ib) 2 <br /> Cum Extraction = 124+3 56 = 4 801b <br /> (Total- 1 b) <br /> N\xls\0805\1461"81897Ni1 XLS Emton <br /> Sheet3 8/18/97 <br />