SITE INFORMATION AND CORRESPONDENCE

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CHRONOLOGY } '8203 HWY 26, STOCKTON 05707/99 On this date a 10,000 gallon unleaded f , a 10,000 gallon diesel,-a 2000 gallon premium gasoline underground storage tank (UST) and Piping were removed from the site under permit and inspection of the Environmental Health Department (EHD . Gasoline �� ) ane odor and soil discoloration was noted at the time of the UST removals. Soil samples collected beneath the UST's were analyzed. The highest concentrations of contamination were in the soil samples from beneath the gasoline UST's. 09724/99 Notification of Hazardous Waste Discharge and Unauthorized Release Forms filed this date. 10/20/99 Date of Work Pian that proposed removal of 350 cubic yards of contaminated soil. 11/03/99 Site placed in the'Local Oversight Program. 03/21700 Excavation of the former UST area, primarily beneath and:around the former 2000 gallon UST area occurred this date. Approximately -195 tons of contaminated soil was removed and taken-to Forward Landfill. The deepest part'of the excavation was 22 feet below surface grade (bsg). 10115-17101 Six soil borings were drilled at-the site. Monitoring wells were constructed in three of the soil borings. 03/07/02 Date of "Preliminary Investigation and Evaluation" report on the work performed in October 2001.' Depth to water is about 91 feet bsg. Contaminated soil exists from 10 to 70 feet. 08/15/02 Date of"Replacement of Well MW1" work plan that states MW is j to be destroyed because it is in the former UST location where a new upgraded UST is to be installed. 09/05/02 This parcel is in the unincorporated area and is very small. There is not sufficient area to meet separation requirements for a UST, a water well and a septic system: This is.the date of the EHD letter stating that the site has been approved for use as an unmanned card-lock facility only and that the water well and septic tank must be destroyed. 09/27/02 The drinking water well and MW 1 were destroyed this date. k i