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TABLE 4 <br /> GROUNDWATER TREATMENT SYSTEM DATA <br /> +� ♦��y/ y. p Thrifty Oil Station#172, Stockton, CA <br /> �d11�7✓F� 1r(Q�Af �� ��`� ��� �� <' �'�' � F ��� � � x » }x` ����, x <* `� �>>}�� r, f �' <br /> 3/28102 78,932 D - - - - - - System stiff off carbon changeout <br /> 4!4102 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 /> 5123(02 92,700 658 - - - - - <br /> 5130102 93114 59 - - - - - GW system off pipe otoak in carbon tank <br /> 6127102 93,114 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 /> 172TAB5 GW System Page 2 of 2 7/23/02 <br />