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I x TABLE 6 EXTRACTION AND EMISSION RATES Former ARCO Service Station No. 548 1612 Hanauer Lane,Stockton, California Extraction Rate from Emissions Rate to Destruction Removal Cumulative TPH Date Wells(lbs/day) Atmosphere (lbs/day) Efficiency, % Removal (lbs) TPH Benzene TPH Benzene TPH Benzene Period Total 09/28/00 12.70 0.047 0.094 0.001 99.3% 97.8%' 12.70 12.70 10/19/00 7,844 0.035 <0.04 <0.0002 99.5% 100% 213.96 226.66 11/28/00 5.59 0.011 <0.037 <0.0002 99.8% 100% 223.99 450.65 12/07/00 3.0 0.005 <0.012 <0.0001 99.8% 100% 27.96 478.61 01/08/01 0.83 0.0005 <0.04 <0.0001 99.15% 100% 22.98 501.59 01/23/01 0.74 <0.0001 <0.03 <0.0001 99.05% 100% 11.74 513.34 02/06101 6.05 <0.007 <0.03 <0.0001 99.53% >98% 47.53 560.87 03/07/01 3.70 <0.007 <0.03 <0.0001 99.81% 100% 133.6fi 694.52 04/23/01 4.75 <0.001 <0.03 <0.0001 99.37% >90% 107.58 802.10 06/04/01 0.78 <0.0035 <0.035 <0.0003 95.52% >91.42% 60.00 862.10 07/23/01 0.08 0.0003 <0.035 <0.0002 64.91% 38.80% 18.60 880.70 08/06/01 0.06 <0.0002 <0.035 <0.0002 40.29% 100% 0.95 881.65 09/05/01 4.97 <0.01 <0.05 <0.0002 98.99% 99.60% 148.79 1030.43 10/01/01 3.064 <0.002 <0.044 <0.0002 >98.6 >90.0 104.65 1135.09 11/05/01 5.009 0.004 <0.053 <0.0003 >98.9 >93.0 141.44 1276.53 01/08/02 4.796 0.003 <0.040 <0.0002 >99.2 >93.0 20.22 1296.75 02/04/02 2.398 <0.010 <0.040 <0.0002 >98.3 >98.0 86.47 1383.23 03/04/02 2.380 0.006 <0.036 <0.0002 >98.5 >97.2 66.39 1449.62 04/01/02 1.243 <0.0018 <0.036 <0.0002 >97.1 >90.0 40.46 1490.08 06/24/02 0.938 <0.0002 <0.039 <0.0002 >95.8 100% 55.91 1545.99 Air Permit Limits DRE shall be at least 95% Daily emmission rates will not exceed two lbs. VOC in any one day NC= Not calculated Sample Calculations Ext. Rate from = 70 cuft x 3100 ma x 0.028 cumeter x Ib x 1,440 min Wells(lbs/day) min cu meter cult 454.000 ma day 19.27 lbs day Dest. Removal= 19.27- (<O.12)x 100 = 99.35% Efficiency, % 19.27 Arco_0548_Quanerly_O&M Page 1 of i