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Table 1 - Summary of VWhemical Analytical Data i Unocal Servtc atton No 6981 4707 Pacific Avenue Stockton, California Wellhead Influent Sample Results Effluent Sample Results Date TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes MtBE TPH TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m) (PPmv) (mg/m) (PPmv) (mg/m3) (mg/m3) (mg/m3) (mg/m) {mg/m� (PPmv) (mg/m3) (PPmv) (mglm) (mglm) (mg/m) 12-05-98 830 219 <10 <03 <10 5 53 NA <10 <3 <010 <003 <010 <010 <010 12-21-97 System restarted 12-29-97 850 224 <50 <1 4 <50 64 88 NA <10 <3 <0 10 <0 03 <O 10 <O 10 <O 10 0126-98 1,300 343 <50 <1 4 <50 77 110 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 02-27-98 1,900 501 <25 <07 3 8 18 95 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 03-25-98 450 119 <1 0 <0 3 <1 0 3 7 50 NA 15 4 <0 10 <0 03 <0 10 <0 I0 021 04-20-98 850 224 <0 5 <01 <05 3 5 67 NA 44 12 <0 10 <0 03 <0 10 <0 10 0 67 05-27-98 480 127 <0 5 <0 I <0 5 15 25 NA 64 17 <0 10 <0 03 <0 10 <0 10 0 18 06-30-98 170 45 <01 <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 <0 3 <10 44 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 14 04 75 20 it NA 110 29 25 0 7 10 12 5 8 10-22-98 390 103 <10 <0 3 <10 <10 50 NA <10 <3 <0 10 <0 03 0 18 <0 10 020 11-03-98 System shut down due to low influent concentrations I 11-18-9$ 760 200 063 02 8 4 <0 50 092 NA 100 26 11-20-98 200 53 <0 10 <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 20 051 2 7 NA 12 3 <0 050 <0 01 <0 050 <0 050 <0 050 01-04-99 91 24 14 04 <0 25 <0 25 0 82 NA 26 7 0 057 002 0 061 <0 050 015 01-04-99 System shut down due to low influent concentrations 01-27-99 500 132 13 3 7 14 <0 25 14 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 10 025 02-01-99 System shut down due to low influent concentrations 02-24-99 510 134 24 6 9 16 <0 50 24 NA 18 5 <0 050 <0 01 <0 050 <0 050 <0 050 03-01-99 110 29 081 023 <0 05 <0 05 14 NA 53 14 0 054 002 <0 50 <0 50 022 03-01-99 System shut down due to low influent concentrations 03-22-99 920 243 11 3 2 054 073 5 1 NA ---? ___2 ---z 2 ---z ----2 2 03-26-99 249 6 6 0 104 0 030 0 106 0 190 0 220 NA ----3 —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 22 074 3 8 NA 95 25 0 17 005 0 064 <0 050 0 13 F 04-23-99 140 37 025 007 <0 050 <0 050 0 99 NA 40 11 0 068 0 020 <0 0500 <0 050 0 13 04-23-99 jSystern shut down due to low influent concentrations For Explanation refer to page 3 Stockton,to 6981 140124 04 i