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a +� <br /> Table 5 <br /> Extraction and Emission Rates <br /> ARCO Service Station No. 2130 <br /> 7906 North E! Dorado Street, Stockton, California <br /> Extraction Rate from Emissions Rate to Destruction Removal Cummulative TPHG <br /> Date Wells Ibs/da AtmosphereObs/day) Efficiency, % Removal lbs <br /> TPHG Benzene TPHG Benzene TPHG Benzene Period Total <br /> 07/17/95 15 18 2 28 287 2 87 81 87 152 152 <br /> 08/29/95 3881 742 295 329 92 96 580 732 <br /> 09/22/95 3881 5 15 557 548 86 89 466 1198 <br /> 01/24/96 1508 206 411 343 97 83 121 16888 <br /> 02/21/96 7801 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 0 19 0 003 98 85 866 19938 <br /> 08/26/96 1186 001 013 0 002 99 80 1150 21088 <br /> 12/04/96 1778 009 123 0 002 93 97 1183 22271 <br /> 03/20/97 853 0 13 0 13 00014 98 99 623 22894 <br /> 06/30/97 15 81 0 005 067 00016 96 67 1375 24269 <br /> 09/30/97 1 1236 0 002 131 1 <0 0015 89 1 >25 531 24800 <br /> 11/24/97 1 833 0 004 0 00 I <0 0000 100 1 >100 383 25184 <br /> 1si quarter 98 System remained off due to low BTEX/ITHG 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 Limits <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 /> Sample Calculations <br /> Ext rate from wells=23 ft;/mm x 170 mg/ml x 0 028 m3/ft3 x 1 Ib/454,000 mg x 1,440 min/day=0 35 lb/day <br /> ]b/day) <br /> Dest Removal = 0 35-0 0118 x 100=96 6% <br /> Efficiency-%) 035 <br /> Cum Extraction = 0 13+0 35 Ib/day x 15 days = 3 6 lb <br /> (Period-lb) 2 <br /> Cum Extraction = 124+3 56 = 4 80 lb <br /> (Total-lb) <br /> CP\E.\ARC012130\QTRLY12130Q498 XLs <br /> Table 5 �GarKtQC�G <br />