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TABLE 7 EXTRACTION AND EMISSION RATES ARCO Service Station No.548 1612 Hammer Lane,Stockton,California Extraction Rate from Emissions Rate to Destruction Removal Cumulative TPH Date Wells lbs/day) Atmos here(lbs/day) Efficiency,% Removal lbs TPH Benzene TPH Benzene TPH Benzene Period Total 09128/00 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 1!8!2001 0.83 0.0005 <0.04 <0.0001 99.15% 100% 22.98 501.59 1/23/2001 0.74 <0.0001 <0.03 <0.0001 99.05% 100% 11.74 513.34 2/6/2001 6.05 <0.007 <0.03 <0.0001 99.53% >98% 47.53 560.87 3/7/2001 3.70 <0.007 <0.03 <0.0001 99.81% 100% 133.66 694.52 4/23/2001 4.75 <0.001 <0.03 <0.0001 99.37% >90% 1 107.58 802.10 6!4!2001 0.78 <0.0035 <0.035 <0.0003 95.52% >91.42% 60.00 862.10 7/23/2001 0.08 0.0003 <0.035 <0.0002 54.91% 38.801% 18.60 880.70 816/2001 0.06 <0.0002 <0.035 <0.0002 40.29% 100% 0.95 881.65 9/5/2001 4.97 <0.01 <0.05 <0.0002 98.99% 99.601/ 148.79 1030.43 10/1/2001 3.064 <0.002 <0.044 <0.0002 >98.6 >90.0 104.65 1135.09 11/5/2001 5.009 0.004 <0.053 <0.0003 >98.9 >93.0 141.44 1276.53 1/8/2002 4.796 0.003 <0.040 <0.0002 >99.2 >93.0 20.22 1296.75 214/2002 2.398 <0.010 <0.040 <0.0002 >98.3 >98.0 86.47 1383.23 3/4/2002 2.380 0.006 <0.036 <0.0002 >98.5 >97.2 66.39 1449.62 411/2002 1.243 <0.0018 <0.036 <0.0002 >97.1 >90.0 40.46 1490.08 6/24/2002 0.938 <0.0002 .0.039 <0.0002 >95.8 100% 55.91 1545,99 7/16/2002 0.309 <0.0002 <0.039 <0.0002 >87,3 100% 21.82 1567.81 8/27/2002 0.599 <0.0020 <0.040 <0.0002 >93.3 >90.0 23.16 1590.97 9/24/2002 1.479 <0.0040 <0.040 <0.0002 >97.3 >95.0 54.03 1645.00 10116/2002 0.238 <0.0007 <0.042 <0.0002 >82.5 >68.8 11.90 1656.89 11/19/2002 0.329 <0.0007 <0.044 <0.0002 >66.5 >68.8 15.86 1672.76 12/26/2002 0.235 <0.0005 .0.044 <0.0002 >81.5 >58.3 20.01 1692.76 1/2212003 0.201 <0.0004 <0.037 <0.0002 >81.5 >58.3 14.18 1706.95 2/25/2003 0.221 <0.0005 <0.041 <0.0002 >81.5 >58.3 5.91 1712.86 3/20/2003 0.230 <0.0005 <0.043 <0.0002 >81.5 >58.3 5.41 1718.27 4/15/2003 0.240 <0.0005 <0.044 <0.0002 >81.5 >58.3 11.75 1730.02 5/28/2003 0.240 <0.0005 1 <0.044 1 <0.0002 1 >81.5 >58.3 7.75 1737.76 6/24/2003 0.240 <0.0005 -10.044 .0.0002 >81.5 >58.3 3.05 1740.81 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 tuft x 3100 ma x 0.028 cumeter x Ib x 1,440 min Wells(lbslday) min cu meter tuft 454,000 mo day 19.27 lbs/da Dest.Removal= 1927-(<O.12)x 100=99.35% Efficiency,% 19.27 K,lwprucessU5 BP AR00\00548\Quarter1y\Arco_0548_O&M-20mrM Page 1 of 1