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TABLE 4 <br /> GROUNDWATER TREATMENT SYSTEM DATA <br /> Thrifty Oil Station#172, Stockton, CA <br /> Discharge Average I N L E T (uglL) OUT LET (uglL) <br /> DATE Totalizer Discharge <br /> Reading Flaw TPHg B T E X MTBE TPWg B T E X MTBE COMMENTS <br /> (gallons) (galtday) <br /> 216102 78,932 0 37,700 5,120 5 000 103 2,860 1,360 <50 2 1 <0 18 1 <0 24 Atter sampling shut down again <br /> 3128102 78,932 0 - - - - - - - System stili off carbon changeout <br /> 414102 78,932 0 - - - - - - Restarted system <br /> 4111102 82,211 468 - - - - _ <br /> 4118102 82,643 62 13,600 1 270 520 482 1,610 207 <50 06 <0 14 <0 18 <0 26 <0 24 <br /> 4125102 83,486 120 - - - - - - - - - System shut down(technician on vacation) <br /> 519102 83,486 0 - - - - - - - - Restarted system <br /> 51231D2 92,700 658 <br /> 5130102 93,114 59 - - - - - - - - - GW system off pipe cloak in carbon tank <br /> 6127102 93,114 1 0 - - - - - - - - System still off <br /> NOTE Total Petroleum Hydrocarbons(TPH)analyzed by EPA Method 8015 modified for gasoline <br /> BTEX and MTBE analyzed by EPA Method 8021 B <br /> I <br /> 172TAB5 GW System Page 2 of 2 12111/02 <br />