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Tabl 2 SoilVapor Extraction m Emission Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,California TPM as Gasoline Benzene Effluent Effluent Hour Meter Blower Average Concen- Emission Destruction Concen- Emission Destruction Sample Date Reading Vacuum Flow Rate tration Rate Efficiency tration Rate Efficiency ID Sampled (hours) ( H2O) (scfm) (ppmv) (lbs/day) (percent) (ppmv) (lbs/day) (percent) EFFL 12/15/95 4,014 11 100 -- -- EFFL 01/04/96 4 538 11 95 34 13 977% — - EFFL 01/26/96 4,765 50 95 47 1 8 949% — -- -- EFFL 02!26196 4,776 45 75 25 08 965% — — -- EFFL 03!27196 5,231 44 75 25 08 965% — — — EFFL 04/15/96 5,380 44 74 4 01 994% — — -- EFFL 05102!96 5,631 44 76 4 01 994% — — -- EFFL 05/15/96 5,819 47 60 13 03 977% — -- — EFFL 06/03196 5,856 45 63 1 00 998% — — — EFFL 06/21/96 5,982 34 70 8 02 985% — — -- EFFL 07/10/96 6,039 30 65 11 03 982% -- — — EFFL 08/12/96 6,219 16 68 81 22 919% — — — EFFL 09/16/96 6,265 14 80 15 05 979% — — — EFFL 10/08/96 6,760 25 60 4 01 992% -- — — EFFL 11!05196 6,954 35 60 0 00 1000% — — -- EFFL 12/20/96 7,387 32 63 2 00 969% — -- — EFFL 01/13/97 7,390 28 60 0 00 1000% — -- — EFFL 06/18/97 7,566 68 45 1 00 997% — — -- EFFL 07/24/97 7,587 48 50 4 01 984% — — -- EFFL 08/28/97 7,588 45 60 0 00 1000% -- — — EFFL 09/10/97 7,607 45 55 8 02 963% — — — EFFL 10/15/97 7,630 30 60 9 02 957% — — — EFFL 11/17/97 7,654 30 60 7 02 961% — — — EFFL 12131/97 7,847 40 65 10 02 947% — -- — EFFL 05/28/98 7,847 60 40 10 02 998% 005 0 001 997% EFFL 06/11/98 8,143 50 105 10 04 985% — 0 000 — EFFL 07/08/98 8,444 — — — — — — — -- scfm =Standard cubic feet per minute ND =Not detected ppmv =Parts per million by volume a =Prior to April 1998 data was collected and reported by Brown and Caldwell lbs =Pounds b =TPH-g and benzene concentrations reported as ND are taken as 0 ppmv =Not applicable or not analyzed for calculation purposes 7G600-026-0113098 O&M Tables 9/23/1999