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r <br /> • Table 5 <br /> l <br /> Extraction and Emission Rates <br /> ARCO Service Station No. 2168 <br /> 441 West Charter Way, Stockton, California <br /> Extraction Rate Emissions Rate Destruction Cummulative TPHG <br /> Date (lb/day) (lb/dav) Efficiency, % Removal (lbs) <br /> TPHG Benzene TPHG Benzene TPHG Benzene Period Total <br /> 1/24/97 11854 2 1 039 00003 997% 9998% 267 267 <br /> 2/20/97 6160 1 6 0 13 0 002 998% 999% 1240 1507 <br /> 3/20/97 3143 0 4 004 0 001 999% 998% 397 1904 <br /> 4/16/97 3457 0 2 006 1 0 001 998% 992% 2702 4606 <br /> 9/9/97 1 5190 0 1 076 1 0 153 985% NC 3077 7684 <br /> C=Not calculated,due to high reporting limit on the effluent <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 lb <br /> Daily benzene emissions shall not exceed 0 02 lb <br /> Sample Calculations <br /> • Ext rate=23 R3/mm x 170 mg/m3 x 0 028 m3/R3 x I lb/454000 mg x 1440 min/day=0 35 lb/day <br /> (lb/day) <br /> Dest Removal = 0 35-0 01 t8 x 100=96 6% <br /> (Efficiency-%) 035 <br /> Cum Extraction = 0 13+0 35 lb/day x 15 days = 3 6 lb <br /> (Period-lb) 2 <br /> Cum Extraction = 1 24+3 56 = 4 80 lb <br /> (Total-ib) <br /> NIx1s108051114061061796M1 xis Rev 0 11/5/97 <br />