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� I Table 1 Summary of Groundwater Extraction System Data, ARCO Station 2133, Stockton, California Start-up date 4/18/91 Date Reporting Effluent concentration, /I Pounds remo (a,b) Total volume, Average sampled eerlod TPH B T E X TPH S T E X extracted, gallons b flowrate, Upm b 11/25/92 11116192-12/15/92 170 074 <05 1 4 16 0 10 000 000 000 001 72500 1 7 12/16/92 12116/92-1/15/93 650 <0 5 0 53 2 1 48 0 00 0 00 0 00 000 0 00 12/30/92 12116/92-1/15/93 700 <05 0 57 1 5 65 0 00 0 00 0 00 000 0 00 1113193 12/16/92-1/15193 760 570 0 88 23 73 0 46 0 00 0 00 0 00 0 04 72500 1 7 1/27193 1116/93-2/15/93 1400 14 <0 5 <0 S 170 0 00 0 00 0 00 0 00 000 2110/93 1/16/93-2/15/93 1600 190 63 22 210 283 0 34 0 11 0 04 037 212486 4 8 2/24193 2/16193-3/15/93 160 2 05 <0 3 <0 5 000 0 00 000 000 000 3/10193 2116/93-3/15/93 1100 89 21 1 160 1 14 009,002 0 00 0 17 124320 3 1 4/14/93 3/16/93.4/15/93 1500 85 18 5 180 1 35 0 08 002 000 0 16 108364 24 5125/93 4/16/93-5/15193 1100 120 36 16 190 0 58 0 06 002 001 0 10 63102 1 5 6110/93 5116/93-6/15193 1200 130 46 20 190 1 89 0 20 007 003 0 30 189207 4 2 7/15193 6/16/93-7/15/93 1100 110 27 10 140 1 15 0 11 0 03 001 0 15 125410 3 0 8/26193 7116/93-8/26193 690 72 is 9 75 1 13 0 12 002 001 0 12 196212 3 3 TOTALS- .,.tnn TPH 6u u'iative nuxaYalt�tis� Mu N y M y A 30.x& Benzene cumulative removal,lbs 337 TPH cumuilativa removal,gallons'(c).— v >vn .5 OD w Total volume,Rallons. 4,837,600 (a) Pounds removal calculation lbs removed = (ug/Q'(g/1,000,000 µg)'(Ib/454 g)'(3 78 Ugal)'(gallons pumped) To calculate pounds removal for a reporting period If several sampling events occurred In one period, we used the effluent concentrations that had the highest TPH value (b) Pounds removed, total volume purged, and average flowrate data are reported In units per reporting period (c) Gallons removal calculation gallons removed = lbs ' galfon/6 2 Ibs