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1 Table 1 - Summary of W*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 TPHg TPHg Benzene Benzene Toluene Ethylbenzene Xylenes (mg/m) (PPmv) (mglm) (PPmv) (mg/m) (Mg/M3) (mg/m3) (mg/m3) (PPmv) (mg/m3) (PPmv) (mglm3) (mg/m3) (mg/m) 12-05-9 830 219 <10 <03 <10 5 53 <10 <3 <010 <003 <010 <0I0 <010 12-21-97 System restarted 12-29-97 850 224 <50 <1 4 <50 6 4 88 <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 01-26-98 1,300 343 <5 0 <14 <5 0 7 7 110 <10 <3 <0 10 <0 03 <0 10 <0 10 <0 10 02-27-98 1,900 501 <25 <07 3 8 18 95 <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 15 4 <0 10 <0 03 <0 10 <0 10 021 04-20-98 850 224 <0 5 <0 1 <0 5 3 5 67 44 12 <0 10 <0 03 <0 10 <0 10 0 67 05-27-98 480 127 <05 <0 1 <0 5 1 5 25 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 45 12 <0 10 <0 03 <0 10 <0 10 <0 10 07-30-98 720 190 <10 <03 <10 4 4 14 48 13 <0 10 <0 03 <0 10 <0 10 <0 10 08-27-98 270 71 <0 50 <0 1 <0 5 <0 5 37 47 12 <0 10 <0 03 <0 10 <0 10 <0 10 09-30-98 220 58 14 04 7 5 2 0 11 110 29 25 0 7 10 12 5 8 10-22-98 390 103 <1 0 <0 3 <10 <1 0 50 <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 02 84 <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 0 26 022 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 12-31-99 760 200 22 63 20 0 51 2 7 12 3 <0 050 <0 01 <0 050 <0 050 <0 050 01-04-99 91 24 14 0 4 <0 25 <0 25 0 82 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 14 <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 10 025 02-0199 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 <0 01 <0 050 <0 050 <0 050 03-01-99 110 29 0 81 0 23 <0 05 <0 05 14 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 2 054 0 73 5 1 __2 ---2 -__2 -__2 -_ 2 -_ a -_ 2 03-26-99 24 9 6 6 0 104 0 030 0 106 0 190 0 220 ---3 ---3 -__3 ----3 -__3 ' -_-_3 03-215-99 System shut down due to low influent concentrations r-- —Y For Bxplaai?oh refer to page 3 to6981 xis AS 140124 04