SITE INFORMATION AND CORRESPONDENCE

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i CHRONOLOGY City of Tracy Wastewater Treatment Plant 3900 Holly Drive Tracy, CA 95376 01/20/98 One 7,500-gallon underground storage tank used to store diesel fuel for a back- up generator was removed this date under San Joaquin County Environmental Health ) EHD Department permit and inspection. Soil and groundwater samples P ( for laboratory analysis were collected from beneath the tank. Analytical results reported total petroleum hydrocarbons as diesel in the soil and.groundwater. 06/29/98 Unauthorized Release Report #98-U23 and Notification of Hazardous Waste Discharge (Prop 65)#98-106 were submitted this date. 12/05/00 Notice of Responsibility was sent this date to identified Responsible Party (RP) the City of Tracy. 02/14/03 A site investigation began with the advancement of four geoprobe soil borings, SB-1 through SB-4. Soil and groundwater samples were collected for analysis. See Wright Environmental Services Soil and groundwater Initial Site Assessment report dated April 7, 2003, available in the EHD site file. 10/28/08 The siteinvestigation continued with the installation of additional geoprobe soil borings, SB-5 through SB-9. See Wright's Limited Phase I Investigation dated January 14, 2009. 10/16/09 The site investigation continued with the installation of one groundwater monitoring well, MW-1, located near SB-5. The report of the work is due no later than December 15, 2009. 03/03/10 EHD letter sent this date directing submittal of the overdue report of findings from the groundwater monitoring well installation. 04/16/10 Wright's Groundwater Monitoring Well Installation and Initial Groundwater Sampling and Chemical Analysis, 3'd Quarter 2009 report submitted this date to Geotracker, (although the report is dated February 16, 2010). 09/20/10 Wright's Waste Water Treatment Plant Quarter 3, 2090 Groundwater Monitoring Report was submitted to Geotracker this date. 11/18/10 Wright submitted Closure Summary Report to Geotracker this date.