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,4 1.0 Introduction ' IT Corporation (IT) is pleased to submit this Preliminary Investigation Evaluation Report to the San Joaquin County Public Health Services Environmental Health Division (PHS/EHD) as requested by Ms Mary Cooper from the Division of the State Architect (DSA) All work on the project was performed in accordance with IT Corporation's contract with DSA (Agreement No UT 081R) 2.0 Site Description ' This section describes the site location, site geology and previous site work ' 2.1 Site Location The Stockton Developmental Center - Boiler Plant site is located at 510 East Magnolia Street in ' Stockton (San Joaquin County), California (Figure 1 - Site Location Map) The former underground tank and underground product piping system is located south of the boiler plant at ' the facility (Figure 2 - Site Plan) 2.2 Site Geology Based on observations of soil types from Geoprobe bonngs installed as part of this site investigation, subsurface materials consist of interbedded silt, silty clay and clayey silt with some minor sands to a depth of at least 3 5 feet below ground surface (bgs) Previous work performed by IT in January 1997 at the San Joaquin Catholic Cemetery site, located approximately 1500 ' feet north of the subject site, indicated the depth to groundwater in the area was between 45 and 50 feet bgs 2.3 Previous Work ' On August 1, 1996, four 10,000 gallon single-walled steel USTs and associated underground product piping were removed from the site by Ramcon Engineering and Environmental Contracting, Inc (Ramcon) of West Sacramento, California On October 23, 1996, Ramcon removed a fifth 10,000 gallon single-walled steel UST from the same location All five of the ' USTs were used to store diesel fuel for the boilers at the site The removed LISTS were transported to Triangle Inc in Sacramento, California for lawful disposal ' SAC/08-29-97/ENG/771744 2