SITE INFORMATION AND CORRESPONDENCE

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Western Stone 8181 West Eleventh Street Tracy CA 95376 APN 237-030-13 Site Code: 1393 Chronology i The site is located at the eastern border of the City of Tracy. Three underground storage tanks were previously. located on the property and were removed on August 23, 1988. Tank 41 2000 gallon unleaded gas Tank 42 350 gallon leaded gas Tank #3 1000 gallon diesel While soil sample results did not indicate petroleum hydrocarbon contamination, groundwater contamination was detected(42 ppb benzene, 130 ppb xylene, and 110 ppm TPH-diesel). Four monitoring wells were installed during the course of the investigation and approximately 400 cubic yards of contaminated soil was excavated. Residual soil contamination exists beneath a building. PHS/EHD considers all approximate remedial actions to have been I completed and recommends that the site be closed. 1988 i 08/23/88 Three underground storage tanks removed this date. 10/05/88 Prop 65 (88-0184) and UAR filed. 1989 05/11/89 Western Stone requests in correspondence for update and remedial action direction. 09/15/89 PHS/EHD places the site into the Local Oversight Program. 10/12/89 PHS/EHD issues a drilling permit. 10/23/89 Three monitoring wells installed. ` 1990 05/22/90 MW4 installed. 1992 07/27/92 Permit #92-2575 issued Two soil borings were drilled to investigate soil contamination. 10/07/92 Excavation soil confirmation sampling was initiated. The excavation was discontinued after all evidence of soil contamination was removed or as a result of physical limitation due to the building's location. j 1993 05/26/93 Issued drilling permit #93-0959. j 06/25/93 Drilled two soil borings to investigate the extent of soil contamination. 1995 Treatment of contaminated soil and excavated groundwater was completed.