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C Table 1. Soil Vapor Extraction and Treatment System Influent Data ARCO Station 2093,Tracy, California Start-up date: 1/4/96 Sample Average flow Days in Down days Percent Influent concentration,ppniv Removal rate,lbs/day Net removal,lbs 8r gallons date Period rate,cfm period in period operational TPH-G B TPH-G 13 TPH-G B 12/15/95 Source test NA NA NA NA 1200 57.0 70 0.5 NA lbs NA lbs 114/96 Startup 95 20 19.6 2% 1455 NM 52 NA 22 lbs NA lbs 1126/96 1/4/96-1126/96 95 22 0.1 99% 931 NM 33 NA 722 lbs NA lbs 2126/96 1126/96-2/26/96 75 31 22 31% 713 NM 20 NA 189 lbs NA lbs 3/27/96 2/26/96-3127/96 75 30 30 2% 713 NM 20 NA 9 lbs NA lbs 4/15196 3/27/96-4/15196 74 19 0 100% 605 NM 17 NA 317 lbs NA lbs 5/2/96 4/15/96-5/2/96 76 17 11 36% 584 NM 17 NA 103 lbs NA lbs 5/15/96 5/2196-5/15196 60 13 3 81% 582 NM 13 NA 137 lbs NA lbs 6/3196 5115/96-6/3/96 63 19 II 41% 482 NM I NA 89 lbs NA lbs 6/21/96 5/15196-6/21196 70 37 35 25% 533 NM 14 NA 21 lbs NA lbs 7/10196 6121/96-7/10196 65 37 32 26% 639 NM 16 NA 81 lbs NA lbs 8/12196 7/10/96-8/12/96 68 52 50 13% 1000 NM 25 NA 60 lbs NA lbs 9/16196 8/12/96-9/16196 80 68 61 17% 702 NM 21 NA 157 lbs NA lbs 10/8/96 9/16/96-10/8/96 60 22 20 13% 486 NM ll NA 21 lbs NA lbs 1115/96 10/8/96-11/5/96 60 28 7 35% 92 NM 2 NA 43 lbs NA IUs 12/20/96 1115/96-12/20196 63 45 37 32% 58 NM l NA II lbs NA lbs Totals and averages 10/8196-12/20196 61 95 64 32% 212 NA 5 NA 74 lbs NA lbs for reporting period 12 gals NA gals ......................................... ................................... .......................... .......................................................................................... ................................................................................................ ..................................... Totals and averages 12/15/95-12/20/96 72 460 337 27% 673 57 21 NA 1983 lbs NA lbs cumulative 320 gals NA gals NM=not measured NA=not applicable Sample Calculations: Mass extraction rate calculation: lbs/day=('Y'ppm)* (I E-6)*(molecular weight lb/lb-mol)* ("y"cubic feet/min)* (24 hr/day)*(60 min/hr)*(lb-mol/380 cubic feet) where"x"is influent concentration in ppm and"y"is the flow rate in cubic feel/min For pounds cumulative removal,the removal Ib/day result is multiplied by the number of days between sampling events. Gallons removal calculation(for TPH): gallons removed=lbs 4 gallon/6.2 lbs IEAARCOS M%WorkcopytBF 96WE52093.XLW1