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I <br /> Table 4 <br /> Extraction and Emission Rates <br /> ARCO Service Station No. 2130 <br /> 7906 North EI Dorado Street, Stockton, California <br /> i <br /> System System Extraction Rate from Emissions Rate to Percent Removal Cumulative Extraction <br /> Vacuum Flow rate Wells(lbs/day) Atmosphere(lbs/day) from Wells(lbs) <br /> Date (In-H20) (CFM) TPHG Benzene TPHG Benzene TPHG Benzene TPHG Benzene <br /> 11/09/94 10 70 63 2 3 0 04 95 2 98 63 2 <br /> 12/22/94 63 70 167 8 13 07 922 9125 5,783 288 <br /> 01/23/95 68 71 186 42 135 2 8 27 4 333 9,313 605 <br /> 02/03/95 58 70a 122 3 7 596 2 1 511 432 11,007 648 <br /> 04/24/95 10 40 45 075 040 0 004 99 1 99 4 11,682 659 <br /> 05/24/95 23 63 63 12 29 0 03 954 975 13,635 696 <br /> 06/27/95 24 70 34 04 28 0 04 918 90 14,757 709 <br /> 07/17/95 25 95 15 18 022 2 87 2 87x10 2 81 11 8741 14,939 711 <br /> 08/10/95 225 95 74 23 057 145 00014 98 1 9976 16,127 720 <br /> 08/29/95 20 93 3881 174 295 0 033 9239 95 57 16,437 726 <br /> 09/22/95 21 93 3881 0 515 557 5 5x10' 85 65` 9932 16,748 730 <br /> Results in pans per million(ppm) <br /> TPHG=Total petroleum hydrocarbons as gasoline <br /> a. Flow rate based on previous readings <br /> b System was shut off on February 3 1495,upon receipt of sample results indicating poor removal efficiency <br /> c System was shut down on October 6 1995 upon receipt of sample results indicating poor removal effigency <br /> NWs\0805511404\1Ot895c4 xls Revision 2 1013095 <br />