SITE INFORMATION AND CORRESPONDENCE

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— a CHRONOLOGY 7505 LiNNE ROAD, TRACY 09/03/93 Two 1500 gallon gasoline UST's and associated piping were removed from the site. Soil samples were collected from beneath . the UST's and piping. No odor was observed beneath the UST's but there was odor observed in the piping area. Soil contamination beneath the piping was confirmed by analysis of the soil samples but the samples beneath the UST's were non detect. 07/21/94 Date of"Site Contamination Work Plan" which proposes to drill two soil borings in the former dispenser area where the piping sample was obtained. ; 08/08/94 Date of Environmental Health Department (EHD) letter that notifies the responsible party that the site was placed in the Local Oversight t Program. 08/12/94 Two soil borings drilled at the site. The total depth of B1 was 45 feet and B2 was 35 feet. �i 09/28/94 Report of work completed 8/12194. Soil contamination appears to be limited to 45 feet below surface grade (bsg). Further investigation to determine lateral extent is required. 02/22/95 Two more soil borings drilled to a total depth of 35 feet. 04195 Date of"Limited Subsurface Investigation Report". Information shows soil contamination is limited laterally. 09/25/95 Date of"Soil Vapor Extraction Pilot Test" work plan. 10/02/95 Installation of vapor extraction wells. 12/06/95 Date of"Corrective Action Plan" that contains the information on the vapor extraction well installation and the vapor extraction test, and recommends vapor extraction as the remedial alternative. 04/25/96 EHD letter that requests computer modeling to assess the need for active remediation. 10/22/96 Date of"Site Summary Report" which includes SESOIL model data. The model indicates that the contamination is not likely to migrate to groundwater, but that if groundwater rises it will probably be impacted by the contamination in the soil. I