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Table 5 <br /> Extraction and Emission Rates <br /> ARCO Service Station No. 2130 <br /> 7906 North EI Dorado Street, Stockton, California <br /> Extraction Rate from Emissions Rate to Destruction Removal Cummulative TPHG <br /> Date Wells lbs/da Atmos hereobs/day) Efficienc , % Removal lbs <br /> TPHG Benzene TPHG Benzene TPHG Benzene Period Total <br /> 07/17/95 1518 2 28 287 2 87 81 87 152 152 <br /> 08/29/95 3881 742 295 3 29 92 96 580 732 <br /> 09/22/95 38 81 515 557 5 48 86 89 466 1198 <br /> 01/24/96 1508 206 411 343 97 83 121 16888 <br /> 02/21/96 78 01 044 5 12 0 012 93 97 2184 19072 <br /> 03/13/96 NC NC NC NC NC NC NC 19072 <br /> 06/18/96 1056 002 019 0 003 98 85 866 19938 <br /> 08/26/96 It 86 001 013 0 002 99 80 1150 21088 <br /> 12/04/96 1778EO <br /> 123 0 002 93 97 1183 22271 <br /> 03/20/97 853 013 00014 98 99 623 2289406/30/97 15815 067 00016 96 67 1375 24269 <br /> 09/30/97 12362 131 <0 0015 89 >25 531 24800 <br /> 11/24/97 8334 000 en 0000 100 >100 383 25184 <br /> 1st quarter 98 System remained off due to low BTEX/TPHG levels in soil vapor <br /> C=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 Urnits <br /> RE 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 /> mrile Calculations <br /> Ext rate from wells=23 ft'/min x 170 mg/m'x 0 028 m'/ft'x 1 Jbl454,000 mg x 1,440 min/day=0 3516/day <br /> lb/day) <br /> est.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 lb <br /> period-lb) 2 <br /> Cum Extraction = 124+3 56 = 4 80 lb <br /> Total-Ib) <br /> CP1C1ARCHIVEIARCO\21301QTRLY12130g100 IT Corporation <br /> 5/2/00 <br />