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Table 2 - Summao VES Operation Unocal Service Station No 6981 4707 Pacific Avenue Stockton, California Destruction Hour Wellhead Influent Effluent Effic Date Meter Flow Rate TPHg MTPHg Cumulative Benzene MBenzene Cumulative Flow Rate TPHg MTPHg Benzene MBenzene TPHg Reading (scfm) mv) (lbs/da ) MTPHg mv) Qbs/da ) MBenzene (scfm) mv) (lbs/da ) mv) Obs/day) 09-22-94 1450 629 1,529 30 0 44 08 0 2924 <3 <0 3 <0 03 <0 003 >99 81 10-07-94 1835 1496 1,147 54 681 38 17 20 1621 <3 <0 1 <0 03 <0 001 >99 75 11-08-94 2512 128 1 1,376 56 2,238 47 1 9 68 175 5 <3 <0 2 <0 03 <0 002 >99 79 12-11-94 3213 11I 4 1,081 38 3,612 16 05 101 138 6 20 09 002 0 001 9820 01-09-95 3894 136 3 1,609 70 4,413 28 1 1 125 258 7 42 35 024 0 018 9738 01-22-95 System shut down for modification from thermal to catalytic mode 05-16-95 4234 1 113 7 2,004 72 5,417 37 12 141 1973 134 8 41 2 87 0 165 9329 05-23-95 System shut down due to destruction efficiency less than 95% 12-19-95 4433 84 1 264 7 5,746 6 01 147 3567 <3 <03 <0 01 <0 001 >99 00 01-24-96 5054 79 8 1,503 38 6,328 16 04 154 3085 4 04 <0 03 <0 003 9974 02-26-96 5397 2140 396 27 6,793 <3 <02 158 2973 15 14 <0 03 <0 002 96 13 03-26-96 5838 221 0 475 33 7,345 <3 <02 161 1880 7 04 <0 03 <0 002 9856 04-23-96 6127 215 6 422 29 7,719 <0 03 <0 002 162 1778 <3 <0 I <0 03 <0 001 >99 38 05-28-96 6715 1023 343 11 8,208 <06 <0 02 162 1909 9 05 <0 03 <0 002 9746 06-25-96 6972 862 844 23 8,392 <3 <0 07 163 266 8 4 04 <0 03 <0 002 9950 07-30-96 7130 151 1 2,030 97 8,788 <3 <0 13 164 192 0 16 10 004 0 002 99 19 08-30-96 7488 145 7 1,793 83 10,131 <3 <0 12 165 3493 369 409 <03 <0 03 7941 09-25-96 7757 705 1,398 31 10,771 <3 <0 06 166 1640 4 02 <0 03 <0 001 9972 10-28-96 8045 1345 501 21 11,086 <t <0 06 167 1894 5 03 <0 03 <0 002 9905 11-21-96 8215 103 5 58 2 l 1,169 <0 I <0 004 167 380 1 3 04 003 0 003 9455 12-20-96 8380 63 8 422 9 11,205 <03 <0 005 167 1829 l0 06 <0 03 <0 002 9763 01-29-97 8685 91 5 264 8 11,308 <1 4 <0 038 166 459 1 <3 <04 <0 03 <0 004 9900 02-27-97 8930 1123 396 14 11,419 <0 3 <0 009 168 1829 26 15 014 0 008 93 33 03.01-97 8990 System down due to mechanical problems 04-01-97 8990 System startup atter repair and maintenence 04-24-97 9154 389 248 3 11,499 <0 1 <0 002 168 1362 15 06 003 0 001 9404 05-31-97 9268 726 475 11 11,532 <03 <0 006 168 1670 3 01 003 0001 9944 06-24-97 9561 1205 475 18 11,709 <1 4 <0 050 168 1839 3 02 003 0 002 9933 Ibs/day = pounds per day ppmv = parts per mullion by volume MBenzene= masa of benzene scfm= standard feet per minute MTPHg=mass of TPHg d/unocal/4855/6981RPr-X'LS 785520-3