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Tablo Paof 10 Soil Vapor Extraction System Performance Data ARCO Service Station#2093 3425 Tracy Boulevard,Tracy,California TPH as Gasoline Benzene EEQ Influent Influent Hour Meter Blower Average Concen- Removal Net Removed Concen- Removal Net Removed Sample Date Reading Vacuum Flow Rate Influent Effluent tration Rate Removed to Date tration Rate Removed to Date ID Sampled (hours) rH20) (scfm) (ppmv) (ppmv) (ppmv) (lbs/day) (pounds) (pounds) (ppmv) (Ibslday) (pounds) (pounds) INFL 12/31/97 7 847 a 40 65 180 95 180 47 36 2 2 748 — INFL 05/28/98 7,847 60 40 4,000 0 390 62 00 2 748 180 02 00 0 INFL 06/11/98 8,143 50 105 650 30 650 273 2068 2 955 - 06 50 50 INFL 07108198 8,444 b — — -- -- 00 00 2 955 -- 00 00 50 INFL 10/12/98 8 444 50 65 600 0 148 04 1741 3 129 02 00 37 88 INFL 11/09/98 8,499 50 29 1,890 382 937 11 1 2 3,131 NO 00 00 88 INFL 12/21/98 8,690 40 29 0 0 143 17 106 3,141 ND 00 00 88 INFL 02/02/99 8,881 40 27 30 2 169 02 101 3,151 04 00 00 88 INFL 03/23/99 10,059 55 40 100 5 495 08 706 3 222 ND 00 00 88 INFL 04/15199 10,609 45 50 190 10 399 08 353 3,257 02 00 023 91 INFL 05/20/99 11 447 55 60 90 6 505 1 2 580 3 315 01 00 005 91 INFL 06/21/99 11 906 50 75 30 3 13 04 32 1 3,347 01 00 012 92 INFL 07/27/99 11,979 55 75 74 5 50 1 5 301 3,377 ND 00 002 92 INFL 08/18/99 12 510 60 90 10 0 192 07 136 3,391 NO 00 002 93 INFL 09/21/99 13,158 60 70 5 0 303 01 389 3,430 ND 00 000 93 INFL 10/05/99 13,492 60 75 15 0 16 05 240 3,454 ND 00 000 93 INFL 11/08/99 14,072 60 70 4 0 ND 00 16 3,456 ND 00 000 93 INFL 12/15/99 14,957 c 60 72 5 0 158 0 5 286 3,484 ND 00 000 93 INFL 01/26/00 14,957 c 62 61 75 0 576 01 26 3,487 00 00 002 93 INFL 02116/00 15,460 c 63 55 2 0 158 0 3 84 3 495 ND 00 000 93 INFL 03115/00 15 461 c 60 47 6 0 803 02 31 3,498 01 00 002 93 REPORTING PERIOD 1126100 to 3115100 TOTAL POUNDS REMOVED 3,4983 93 TOTAL GALLONS REMOVED 5735 1 3 PERIOD POUNDS REMOVED 1409 000 PERIOD GALLONS REMOVED 23 00 PERIOD AVG FLOW RATE 54 PERIOD PERCENT OPERATIONAL 43% scfm =Standard cubic feet per minute NS=Not sampled lbs =Pounds a Prior to April 1998 all data was collected and reproted by Brown and Caldwell Not available or not applicable b SVE system left off on 718198 ND =Non-detectable above detection limit c System is being pulsed(one month on one month oft) ppmv =Parts per million by volume TPH =Total petroleum hydrocarbons Density of benzene=7 34 pounds per gallon Density of gasoline=6 1 pounds per gallon 077 41728 0070&M Tablesl xIs/TABLE 1 417100