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TABLE 4 GROUNDWATER TREATMENT SYSTEM DATA Thrifty Oil Station#172, Stockton, CA Discharge Average I H L E T (ug1L) O 0 T L E T (ug/L) DATE Totalizer Distharge COMMENTS Reading Flow TPHg B T E X MTBE TPF1g B T E X MTBE {galions) (galtday) 4/26/01 0 - - - - - - - _ _ Startup System 5110/01 2,970 212 58,400 13,300 10 900 1,820 6 710 2,030 <50 <0 18 <0 14 <0 18 <0 26 <0 24 5124101 8,382 387 - - - - - _ - 715/01 27 607 458 65,800 10 000 12,300 1 870 7,250 1,330 <50 <0 18 <0 14 <0 18 <0 26 <0 24 7/12/01 28 901 185 7119/01 31,822 417 7/26/01 34 656 405 - - - - - _ _ Found system off restarted 7131101 36,982 465 - - - - - - - Shut down GW system for carbon change 812/01 37,040 29 Restarted GW system 818/01 38,050 168 8/14101 39,870 303 - - _ _ _ _ _ - shut down system for aws 8116101 39 871 1 - - - _ - - Restarted system 8/23101 43,631 537 8/31101 48,019 549 916101 51,152 522 9112101 54,329 530 70,100 9,800 13,100 1 1810 7,970 *1,160/619 <50 <018 <014 <018 <026 <024 9120101 58,740 551 - - - - - - - _ 9127101 58 756 2 - 1014101 61,382 375 - 10/11/01 63 833 350 - 10/18/01 65,557 246 18,000 2,400 2 800 254 1,540 513 <50 <018 1 <014 <0 18 <0 26 <0 24 10/25/01 69,550 570 - - - - - _ _ _ _ 11/2101 72,125 322 - _ _ _ _ _ _ Shut down system for QWS 11/9/01 72,126 0 Restarted system 11/14/01 72,239 23 43,000 5,300 6,350 837 2 790 *60411187 <50 <0 18 <0 14 <0 18 <0 26 1 <0 24 11/21/01 72,961 103 - - - - - - _ 11/28/01 73,225 38 - - - - _ _ Shut down GW system 12/19/01 73 225 0 337 14 4 <0 18 13 *3041287 113 <0 18 <0 14 <0 18 <0 26 *30123 Restarted system 12/27/01 77,071 481 - - - - - 1/3102 78,259 170 - - - - - Shutdown system carbon change 1118102 1122/02 78,259 0 - _ _ _ Restarted GW system 1124/02 78,438 90 - 1/31/02 78,932 71 - - - _ _ Knockout switch shut down system restarted 211102 78 932 0 - - - _ _ GW system shut down 172TAB5 GWSystem Page i oft 12/11/02