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CHRONOLOGY 2450 S. EL DORADO STREET, STOCKTON 04/18/02 The date of a work plan for soil investigation. During performance of geotechnical work at the site contaminated soil was encountered at depths of 8 to 15 feet. A Phase I review of the site was conducted and there were no indications of underground storage tanks (UST's) or above ground storage tanks existing on the property. A railroad spur was located on the property in 1952. 05/10/02 On this date 5 soil borings were advanced. Soil contamination was found in borings B2 and B5 at 5, 10, 15 and 20 feet below grade. This work is documented in the Phase II Site Assessment Report dated May 21, 2002, by Advanced GeoEnviron mental Inc. (AGE) and Final Results-Limited Phase II Environmental Site Assessment dated May 23, 2002 by Construction Testing and Engineering (CTE). In November 2002 two UST's were found near B5 but the source of the contamination in the area of B2 in unknown. 06/06/02 On this date the Environmental Health Department (EHD) left a message for Central Valley Regional Water Quality Control Board (CVRWQCB), Spills, Leaks, Investigations and Cleanup (SLIC) unit about overseeing the corrective action at this site since UST's did not appear to be the source of contamination. 07/10/02 On this date a consultant left a message that they had found paint cans, and metal at the site. 07/24/02 On this date two more geoprobe borings were performed at the site to vertically define the extent of the soil contamination and obtain a water sample. PB1 was located near B2 and BP2 was located near B5. 09/04/02 The date of the CVRWQCB-SLIC letter documenting approval of excavation of contaminated soil and collection of grab water samples after the excavating was completed. 08/15/02 The date of Subsurface Investigation Report that discusses excavation of exploratory trenches where building materials, authomobile body and engine parts were found and advancement of three geoprobes, two in July 2002 and one in August 2002. PB1 and PB2 were advanced to investigate the vertical extent of the contamination in the areas of B2 and B5. PB3 was advanced to investigate the lateral extent of the contamination north of B5. A grab ground water sample was collected from PB2 and the results showed low levels of contamination. 11/12/02 - Ori-this date the EHD verified that a redwood UST had been found in the area of the PB2/B5 locations. 11/22/02 On this date a second redwood UST was found near the one found on 11/11/02.