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Table 1 - Summary of V*hemical 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 EthyPoenzene Xylenes (mg/m3) (ppmv) (mg/m') (ppmv) (mg/m') (mg/m3) (mg/m') (mg/m') (mg/m3) (ppmv) (mg/m3) {ppmv} (mg/m) (mg/m) (mglm3} 12-05-98i 830 219 <1 0 <0 3 <1 0 5 53 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 12-21-97 System restarted 12-29-97 850 224 <50 <1 4 <50 6 4 88 NA <10 <3 <0 l0 <0 03 <0 10 <0 10 <0 1Q 01-26-98 1,300 343 <5 0 <14 <5 0 7 7 110 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 02-27-98 1,900 501 <2 5 <0 7 3 8 18 95 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 03-25-98 450 119 <1 0 <03 <1 0 3 7 50 NA 15 4 <0 10 <0 03 <0 10 <0 10 021 04-20-98 850 224 <0 5 <0 1 <05 3 5 67 NA 44 12 <0 10 <0 03 <0 10 <0 10 0 67 05-27-98 480 127 <05 <0 1 <05 1 5 25 NA 64 17 <0 10 <0 03 <0 10 <0 10 018 06-30-98 170 45 <0 1 <0 03 <0 1 19 6 3 NA 45 12 <0 10 <0 03 <0 10 <0 10 <0 10 07-30-98 720 190 <10 <03 <1 0 4 4 14 NA 48 13 <0 10 <0 03 <0 10 <0 10 <0 10 08-27-98 270 71 <0 50 <0 1 <0 5 <05 3 7 NA 47 12 <0 10 <0 03 <0 10 <0 10 <0 10 09-30-98 220 58 1 4 0 4 75 20 11 NA 110 29 2 5 0 7 10 1 2 5 8 10-22-98 390 103 <1 0 <03 <1 0 <10 5 0 NA <10 <3 <0 10 <0 03 0 18 <0 t0 020 11-03-98 System shut down due to low influent concentrations 11-18-98 760 200 0 63 0 2 8 4 <0 50 0 92 NA 100 26 <0 10 <0 03 <0 10 <0 10 0 19 t 1-20-98 200 53 <0 t0 <0 03 0 26 022 2 6 NA 22 6 <0 10 <0 03 <0 10 <0 10 <0 10 11-20-98 System shut down due to low influent concentrations 12-31-98 760 200 22 6 3 20 0 51 27 NA 12 3 <0 050 <0 01 <0 050 <0 050 <0 050 01-04-99 91 24 14 0 4 <0 25 <0 25 082 NA 26 7 0 057 0 02 0 061 <0 050 0 15 01-04-99 System shut down due to low influent concentrations 01-27-99 500 132 13 3 7 I 4 <0 25 1 4 NA 19 5 <0 050 <0 01 <0 050 <0 050 <0 050 02-01-99 280 74 <0 50 <0 14 <0 50 <0 50 25 NA 47 12 <0 10 <0 03 <0 10 <0 10 0 25 02-01-99 System shut down due to low influent concentrations 02-24-99 510 134 24 6 9 1 6 <0 50 24 NA 18 5 <0 050 <0 01 <0 050 <0 050 <0 050 03-01-99 110 29 0 81 0 23 <0 05 <0 05 1 4 NA 53 14 0 054 0 02 <0 50 <0 50 022 03-01-99 System shut down due to low influent concentrations 03-22-99 920 243 11 3 2 0 54 0 73 5 1 NA 2 z - -z z --_z x -_2 03-26-99 24 9 6 6 0 104 0 030 0 106 0 190 0 220 NA 9 ---_3 ----3 ---3 -- 3 3 --- 3 03-26-99 System shut down due to low influent concentrations 04-20-99 1,600 422 29 8 3 22 0 74 3 8 NA 95 25 0 17 0 05 0 064 <0 050 0 13 04-23-99 140 37 0 25 0 07 <0 050 <0 050 0 99 NA 40 11 0 068 0 020 <0 0500 <0 050 0 13 04-23-99 System shut down due to low influent concentrations For Explanation refer to page 3 Stockton to 6981 140124 04