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Table 1 - Summary of VAhemical 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 I TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m3) (PPmv) (mg/m3) (PPmv) (mg/m3) (mg/m3} (mglm3) (mg/m') (mg/m3) (PPmv) (mg/m3) (Ppmv) ('91M3) (mg/m3) (mg/m3) 12-05-981 830 219 <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 <5 0 <1 4 <5 0 64 88 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 01-26-98 i 1,300 343 <5 0 <1 4 <5 0 77 110 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 02-27-98 1,900 50t <2 5 <07 3 8 18 95 NA <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 03-25-98 450 119 <10 <0 3 <1 0 37 50 NA 15 4 <0 10 <0 03 <0 10 <0 10 021 04-20-98 850 224 <05 <0 1 <0 5 3 5 67 NA 44 12 <0 10 <0 03 <0 10 <0 10 067 05-27-98 480 127 <05 <0 I <0 5 1 5 25 NA 64 17 <0 10 <0 03 <0 10 <0 t0 0 18 06-30-98 170 45 <0 1 <0 03 <0 1 19 63 NA 45 12 <0 10 <0 03 <0 10 <0 10 <0 10 07-30-98 720 190 <10 <03 <1 0 44 14 NA 48 13 <0 10 <0 03 <0 10 <0 to <0 10 08-27-98 270 71 <0 50 <0 1 <05 <05 37 NA 47 12 <0 10 <0 03 <0 10 <0 10 <0 10 09-30-98 220 58 1 4 04 75 20 11 NA 110 29 25 07 t0 12 5 8 10-22-98 390 103 <1 0 <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 11-18-98 760 200 063 02 8 4 <0 50 092 NA 100 26 <0 10 <0 03 <0 10 <0 10 0 19 11-20-98 200 53 <0 10 <0 03 026 022 26 NA 22 6 <0 t0 <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 63 20 051 27 NA 12 3 <0 050 <0 01 <0 050 <0 050 <0 050 01-04-99 91 24 14 04 <0 25 <0 25 082 NA 26 7 0 057 002 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 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 t0 025 02-01-99 System shut down due to low influent concentrations 02-24-99 510 134 24 69 1 6 <0 50 24 NA 18 5 <0 050 <0 01 <0 050 <0 050 <0 050 03-01-99 Ito 29 081 023 <0 05 <0 05 1 4 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 32 054 073 5 1 NA i --_-� ___ z z 3 3 3 03-26-99 24 9 66 0 I04 0 030 0 106 0 190 0 220 NA ----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 04-23-99 140 37 025 007 <0 050 <0 050 099 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