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IJ I Table 1 . Soil Vapor Extraction System Performance Data Unocal Service Station 2859 1665 Pacific Avenue Stockton California TPPH as Gasoline Benzene Influent Influent Influent Influent Hourmeter Flow Concen- Concen- Removal Removed Concen- Concen- Removal Removed Sample Date Reading Rate tration tration Rate to Date tration tration Rate to pate ID Sampled (hours) (scfm) (pg1L) (ppmv) (lbs/day) (lbs) (pglL) (ppmv) (lbs/day) (Ibs) INFL 01/17/95 a 1 984 47 7 500 1 773 31 68 00 77 22 033 000 INFL 02/12/96 1986 51 3,800 898 1742 20 28 81 013 002 INFL 03/13/96 2 284 72 210D 496 1359 1945 50 to ND 003 1 02 INFL 04/09/96 2 568 103 2 500 591 2314 411 9 10 b ND 009 1 76 INFL 05/02196 2 892 120 1 400 331 1510 6700 50 b ND 005 274 INFL 06/06/96 3 676 61 1 100 260 603 1,()151 2 6 075 001 386 INFL 07/10/96 4 267 72 300 71 1 94 1 1166 20 b ND 001 420 INFL 07/30/96 4 566 104 3 400 804 31 78 1 326 6 14 40 013 510 INFL 08129/96 5 140 70 2,400 567 1510 1 8677 12 35 006 7 48 INFL 09/06/96 5,237 86 3 000 709 2319 1 9450 12 35 009 782 REPORTING PERIOD 06106196-09/06/96 TOTAL POUNDS REMOVED 1,9450 782 TOTAL GALLONS REMOVED 319 1 1 PERIOD POUNDS REMOVED 9299 3 96 PERIOD GALLONS REMOVED 152 us TOTAL DAYS OF OPERATION 1365 PERIOD DAYS OF OPERATION 650 PERIOD AVERAGE FLOW RATE(scfm) 83 PERIOD PERCENT OPERATIONAL 71% TPPH =Total purgeable petroleum hydrocarbons scfm =Standard cubic feet per minute ppmv =Parts per million by volume lbs =Pounds ND = Not detected above the detection limit a SVE system started 1117196 and sampled,shutdown pending receipt of permit to operate b Concentrations reported as ND use the detection limit to calculate mass removal and emission rates Concentrations shown in ppmv are calculated from micrograms per liter as reported by the laboratory See certified analytical reports for detection limits 31OWSAM96QPR XLSITABLEI A-2 November 8, 1996