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Table 1 - Summary of VT"&emical 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 TPHg3 TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m3) (PPmv) (mg,m) (PPmv) (mg/m3) (mg/m) (mg1m) (mg/m) (PPmv) (mglm3) (PPmv) (mg1m) (mg/m) (mg/m) 12-05-98' 830 219 <1 0 <0 3 <1 0 5 53 <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 <5 0 6 4 88 <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 01-26-98 1,300 343 <5 0 <1 4 <5 0 7 7 110 <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 <10 <3 <0 10 <0 03 <0 10 <0 10 <0 to 03-25-98 450 119 <10 <0 3 <1 0 3 7 50 15 4 <0 10 <0 03 <0 10 <0 10 0 21 04-20-98 850 224 <05 <0 1 <0 5 3 5 67 44 12 <0 10 <0 03 <0 10 <0 I0 0 67 05-27-98 480 127 <05 <0 1 <05 15 25 64 17 <0 I0 <0 03 <0 10 <0 10 0 I8 06-30-98 170 45 <0 1 <0 03 <0 1 19 6 3 45 12 <0 10 <0 03 <0 10 <0 10 <0 10 07-30-98 720 190 <1 0 <0 3 <1 0 4 4 14 48 13 <0 10 <0 03 <0 10 <0 10 <0 10 08-27-98 270 71 <0 50 <0 1 <05 <05 3 7 47 12 <0 10 <0 03 <0 10 <0 10 <0 I0 09-30-98 220 58 1 4 0 4 7 5 2 0 11 110 29 2 5 0 7 10 12 5 8 10-22-98 390 103 <1 0 <0 3 <10 <10 5 0 <10 <3 <0 10 <0 03 0 18 <0 10 020 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 92 100 26 <0 10 <0 03 <0 10 <0 10 0 19 11-20-98 200 53 <0 10 <0 03 026 0 22 2 6 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 2 0 0 51 2 7 12 3 <0 050 <001 <0 050 <0 050 <0 050 01-04-99 91 24 1 4 0 4 <0 25 <0 25 0 82 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 1 4 <0 25 14 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 2 5 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 16 <0 50 2 4 18 5 <0 050 <001 <0 050 <0 050 <0 050 03-01-99 110 29 0 81 0 23 <0 05 <0 05 1 4 53 14 0 054 0 02 <0 50 <0 50 0 22 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 ---2 2 ___2 --- 03-26-99 24 9 6 6 0 104 0 030 0 106 0 190 0 220 ---3 ---3 --_3 __ 3 _- 3 --- 03-26-99 System shut down due to Iow influent concentrations 04-20-99 1,600 422 29 8 3 2 2 0 74 3 8 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 40 11 0 068 0 020 <0 0500 <0 050 0 13 04-23-99 System shut down due to low influent concentrations Eor Explanation refer to page 3 Stockton,to 6981 Xis t40124 04