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Table 1 - Summary of Voliemical Analytical Data Unocal Service Station No 6981 4707 Pacific Avenue Stockton, California Wellhead Influent Sample Results Effluent Sample Results Date TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes MtBE TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m3) (Ppmv) (191m3) (ppmv) (mg/m3) (mg/m3) (mg/m3) (mglm3) (mg/m3) (ppmv) ('g/13) (Ppmv) (mg/m3) (mg/m3) (mg/m3} 09-22-94 S,SOQ 1,529 153 44 452 66 227 NA <11 <3 0 108 <0 03 0 152 <0 109 0 109 10-07-94 4,350 1,147 132 38 493 37 118 NA <11 <3 0 108 <0 03 <0 111 <0 109 <0 109 11-08-94 5,220 1,376 164 47 238 26 118 NA <11 <3 0 108 <0 03 <0 III <0 109 <0 109 12-11-94 4,100 1,081 57 16 320 58 220 NA 74 20 0 060 002 12 1 1 64 01-09-95 6,100 1,609 99 28 640 120 560 NA 160 42 0 83 024 15 57 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 NA 510 134 10 287 30 2 9 8 4 05-23-95 System shat down due to destruction efficiency less than 95% 12-19-95 1,000 264 20 6 28 3 11 NA <10 <3 <0 050 <0 01 0 11 <0 Q50 00089 01-24-96 5,700 1,503 56 16 540 89 440 NA 15 4 <0 10 <0 03 <0 10 <0 10 0 10 02-26-96 1,500 396 <10 <3 120 20 93 NA 58 15 <0 10 <0 03 030 <0 10 3 1 03-26-96 1,800 475 <10 <3 150 30 150 NA 26 7 <0 10 <0 03 <0 10 <0 to 071 04-23-96 1,600 422 <0 10 <0 03 160 38 180 NA <10 <3 <0 10 <0 03 <0 10 <0 10 059 05-28-96 1,300 343 <20 <06 96 34 170 NA 33 9 <0 to <0 03 <0 10 <0 10 0 19 06-25-96 3,200 844 <to <3 210 89 480 NA 16 4 <0 10 <0 03 029 0 10 057 I 07-30-96 7,700 2,030 <10 <3 460 250 1,500 NA 62 16 0 14 004 2 1 1 4 98 08-30-96 6,800 1,793 <10 <3 490 170 1,100 NA 1,400 369 <10 <029 67 37 270 09-25-96 5,300 1,398 <10 <3 160 140 1,000 NA 15 4 <0 10 <0 03 0 13 <0 10 1 1 10-28-96 1,900 501 <5 0 <1 40 45 310 NA 18 5 <0 10 <0 03 0 13 0 13 068 11-21-96 220 58 <0 50 <0 1 76 25 ti NA 12 3 0 11 003 021 0 12 087 12-20-96 1,600 422 <1 0 <0 3 29 16 76 NA 38 10 <0 10 <0 03 <0 10 0 16 1 0 01-29-97 1,000 264 <5 0 <1 4 11 27 180 NA <10 <3 <0 10 <0 03 <0 10 <0 10 048 02-27-97 1,500 396 <10 <0 3 3 4 32 260 NA 100 26 <0 50 014 <0 50 066 70 03-01-97 System down due to mechanical problems 04-01-97 System startup after repair and mamtenence 04-24-97 940 248 <0 50 <0 14 1 6 22 190 NA 56 15 <0 10 <0 03 <0 10 0 69 7 0 05-31-97 1,800 475 <10 <03 17 34 310 NA <10 <3 <0 10 <0 03 <0 10 <0 10 080 06-24-97 1,800 475 <5 0 <1 4 <5 0 28 280 NA 12 3 <0 10 <0 03 <0 10 <0 10 035 07-31-97 800 211 <0 50 <0 1 068 21 190 NA 12 3 <0 10 <0 03 <0 10 <0 10 1 1 08-28-97 980 258 <1 0 <0 3 <10 15 160 NA <10 <3 <0 10 <0 03 <0 10 <0 10 061 09-28-97 1,500 396 <1 0 <0 3 <10 18 170 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 10-26-97 ISystem found to be down due to failure of the flame detector For Explanation refer to page 3 140124 04 Stockton to 6981