SITE INFORMATION AND CORRESPONDENCE FILE 2

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Chronology v Page 3 595 E. 11`h Street, Tracy 12/19/01 The date of the EHD letter response to Proposed Cleanup Approach that requires field test data to support the feasibility of the remedial alternatives evaluated prior to approving any corrective action plan. 04/03/03 The date the EHD received Wright Environmental's Corrective Action Plan (CAP) dated March 27, 2003, that selects injection of biological material into the soil and groundwater. 04/30/03 The date of the EHD letter response to the CAP that advises that the Regional Board requires a report of waste discharge for injection of biologicals and requests supporting documentation that this method has received regulatory approval for its use and has had satisfactory results. 10/03/03 Date that Wright Environmental submits a work plan to excavate soil in the areas of MW3 and MW9 since they were unable to support the use of biologicals at the site. 10/17/03 The date of the EHD letter approving Interim Corrective Action (excavation) at the site and requires MW3 and MW9 to be destroyed prior to excavation and replaced after excavation. 10/27/03 Public Participation initiated this date for the proposed corrective action. 01/13/04 Monitoring wells MW3 and MW9 were destroyed this date. 02/11/04 Excavation and removal of contaminated soil began this date. Discolored and highly odorous soil was removed up to the mobile homes and the old irrigation pipe. Some obviously contaminated soil could not be reached or was unsafe to remove. 10/10/04 Replacement wells, MW3R and MW9R, were installed on this date. 11/22/04 The date the EHD received Wright Environmental's Soil Excavation and Disposal Report dated October 29, 2004. Twenty nine (29) excavation soil samples were analyzed, six excavation water samples were analyzed, 900 cubic yards of soil were removed and disposed offsite, and 239,250 gallons of water were extracted and disposed to the City of Tracy sewer. It was calculated that 787 gallons of TPHg and 4.1 gallons of benzene was contained in the soil removed and that 2.3 gallons of TPHg and 0.21 gallons of benzene was in the ground water removed. 02/08/07 The date the EHD received Wright Environmental's Work Plan for Soil Vapor Sampling dated November 17, 2006.