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WORK PLAN ADDENDUM <br /> To the Work Plan Dated 1 August 2006 <br /> 1 .0 INTRODUCTION <br /> The following is a chronological listing of activities at California Tank Lines (CTL) <br /> Stockton terminal relevant to removal of underground storage tanks (USTs) and <br /> determination of the vertical and lateral extent of contamination. <br /> ACTIVITY DATE BY <br /> Remove Waste Oil USTs 1990 Bill Messick Co. <br /> Determine Extent of Contamination 1997 Sierra-Pacific (SP) <br /> Work PlanDated 08/28/96 <br /> Report of Investigation Dated 02/04/97 <br /> Remove Diesel USTs 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 /> i <br /> Determine Extent of Contamination 2000 Environeering, Inc. (EI) <br /> Work Plan Dated 05/01/00 <br />!� Work Plan Addendum Dated 05/11/00 <br /> Report of Investigation Dated 01/23/01 <br /> Groundwater Monitoring 1999 to 2006 Environeering, Inc. (EI) <br /> Groundwater monitoring has shown groundwater elevations generally trending <br /> downwards during the period 12/22/99 through 3/29/06 . Diesel contamination in MW- 1 <br /> (Diesel UST) dropped significantly from the level in late 1999, early 2000, and has <br /> remained relatively low since early 2003 . Used oil contamination in MW-2 (Used Oil <br /> i <br />` 1 <br /> f <br />