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WORK PLAN <br /> Determination of the Extent of Contamination Affecting Aff 4 <br /> 1 .0 INTRODUCTION <br /> The following is a chronological listing of activities at California Tank Lines (CTL) Stockton <br /> terminal relevant to removal of underground storage tanks (USTs) and determination of the <br /> vertical and lateral extent of contamination. <br /> ACTIVITY DATE BY <br /> Remove Waste Oil USTs C 2 1990 Bill Messick Co. <br /> Determine Extent of Contamination 1997 Sierra-Pacific (SP) <br /> Work Plan Dated 08/28/96 <br /> Report of Investigation Dated 02/04/97 <br /> Remove Diesel USTs l ! Oo / Ui Uo 0 1998 Station Equip. Co. <br /> Determine Extent of Contamination 1999 Environeering, Inc. (EI) <br /> Work Plan Dated 01 /28/99 - <br /> Report of Investigation Dated 02/03/00 <br /> Determine Extent of Contamination 2000 Environeering, Inc. (EI) <br /> Work Plan Dated 05/01 /00 r <br /> Work Plan Addendum Dated 05/20/06 Ad VA ie-x'w( 6 AIS 7 <br /> Report of Investigation Dated i n S i �. dl tea/ Gil 4 <br /> Groundwater Monitoring 1999 to 2006 Environeering, Inc. (EI) <br /> Groundwater monitoring has shown groundwater elevations generally trending downwards <br /> during the period 12/22/99 through 3/29/06. Diesel contamination in MW4 (Diesel UST) <br /> l <br /> dropped significantly from the level in late 1999, early 2000, and has remained relatively low <br /> since early 2003 . Used oil contamination in MW-2 (Used Oil UST) showed considerable <br /> 1 <br />