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iTable 1 - Summary of VE*hemical Analytical Data Unocal Service Station No 6981 4707 Pacific Avenue Stockton, California I Wellhead influent Sample Results Effluent Sample Results Date TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m� mv) (mglm� mv) (mglm� (mg/m� (mglm� (mglm) pmv) (mg/m) mv) (mglm) (mg/m) (mg/m) 09-22-94 5,800 1,529 153 44 452 66 227 <11 <3 0 108 <0 03 0 152 <0 109 0 109 10-07-94 4,350 1,147 132 38 493 37 118 <11 <3 0108 <003 <0 Ill <0109 <0109 11-08-94 5,220 1,376 164 47 238 26 118 <11 <3 0 108 <0 03 <0 111 <0 109 <0 109 12-11-94 4,100 1,OSl 57 !6 320 58 220 74 20 0 060 0 02 1 2 1 1 6 4 01-09-95 6,100 1,609 99 28 640 120 560 160 42 0 83 024 15 5 7 29 01-22-95 System shut down for modification from thermal to catalytic mode 05-16-95 7,600 2,004 130 37 580 96 330 510 134 10 2 87 30 2 9 8 4 05-23-95 System shut down due to destruction efficiency less than 95% 12-19-95 1,000 264 20 6 28 3 11 <l0 <3 <0 050 <0 01 0 11 <0 050 00089 01-24-96 5,700 1,503 56 16 540 89 440 15 4 <0 10 <0 03 <0 10 <0 10 0 to 02-26-96 1,500 396 <10 <3 120 20 93 58 15 <0 10 <0 03 030 <010 3 1 03-26-96 1,800 475 <10 <3 150 30 150 26 7 <0 t0 <0 03 <0 10 <0 to 0 71 0423-96 1,600 422 <0 10 <0 03 160 38 180 <10 <3 <0 10 <0 03 <0 10 <0 10 0 59 05-28-96 1,300 343 <20 <06 96 34 170 33 9 <0 10 <0 03 <0 10 <0 10 0 19 06-25-96 3,200 844 <10 <3 210 89 480 16 4 <0 10 <0 03 0 29 0 10 057 07-30-96 7,700 2,030 <10 <3 460 250 L,500 62 16 0 14 0 04 2 1 14 9 8 08-30-96 6,800 1,793 <10 <3 490 170 L,100 1,400 369 <10 <029 67 37 270 09-25-96 5,300 1,398 <10 <3 160 140 1,000 15 4 <0 10 <0 03 0 13 <0 10 1 1 10-28-96 1,900 501 <5 0 <1 40 45 310 18 5 <0 10 <0 03 0 13 0 13 068 11-21-96 220 58 <0 50 <0 1 7 6 2 5 11 12 3 0 11 0 03 0 21 0 12 087 12-20-96 1,600 422 <10 <03 29 16 76 38 to <0 to <0 03 <0 to 0 16 10 01-29-97 1,000 264 <5 0 <1 4 11 27 180 <10 <3 <0 10 <0 03 <0 l0 <0 10 <0 10 02-27-97 1,500 396 <10 <03 3 4 32 260 100 26 <0 50 0 l4 <050 0 66 7 0 03-01-97 System down due to mechanical problems 04-01-97 System startup after repair and matntenence 0424-97 940 248 <0 50 <0 14 1 6 22 190 56 i5 <0 10 <0 03 <0 10 069 7 0 05-31-97 1,800 475 <10 <03 1 7 34 310 <10 <3 <0 10 <0 03 <0 10 <0 10 0 80 06-24-4 97 1,800 475 <5 0 <1 4 <50 28 280 12 <3 <0 10 <0 03 <0 10 <0 10 0 35 mgliii3 =milligrams per cubic meter ppmv=parts per million by volume TPHg =Total Petroleum Hydrocarbons as gasoline d/unocall4855/6981RPT XLS 795520-3