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ALTON GEOSCIENCE Apn120, 1999 San Joaquin County Public Health Services 304 Fast Weber Street, Third Floor Stockton, California 95202 25-0740-02 ATTN MS CAROL OZ SITE CHP FAClLr Y 385 WEST GRANTLINE ROAD TRACY, CALIFORNIA RE- SUBSURFACE INVESTIGATION REPORT Dear Ms. Oz- Alton Geoscieno�submits this Subsurface Investigation Report for the California Highway Patrol (CHP) facility, located at 385 West Grandme Road in Tracy, California (Figure 1) 1.0 OBJECTIVES The site assessment activities were performed to determine if any contaminated soil exists in the immediate vicinity of an existing gasoline underground storage tank (UST) at the above referenced site This investigation was performed at the request of San Joaquin County Public Health Services as part of pemuttnng the single wall fiberglass UST to meet the 1998 upgrade requirements 2.0 SITE DESCRIPTION The site is currently a CHP Station with a gasoline UST and pump for fueling CHP vehicles (Figure 2) The site is located about 3,500 feet south of Highway 205 at an elevation of approximately 25 feet above mean sea level (NGVD-1929) Topography in the viciruty of the site is relatively flat, sloping slightly to the north The site lies in the Central Valley of California Geologically, the valley is a large asymmetric trough that is bounded by pre-Ternary graiutic, metamorphic, and marine sedimentary rocks The trough has been filled with as much as 30,000 feet of sediment in the San Joaquin Valley to the south and as much as 60,000 feet of sediment in the Sacramento Valley to the north. These sediments range in age from Jurassic to Holocene and include both marine and continental sedimentary deposits (USGS 1986) The scope of this investigation includes only the uppermost deposits wiflun the Central Valley Cfo �nfts of Ternary and Quaternary age compose a number of formations, in total they (510)606 9150•FAX(510)606 9260