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WORK PLAN ENVIRONMENTAL SITE INVESTIGATION Stockton Developmental Center - Boiler Plant 510 East Magnolia Street Stockton, California i 1.0 Introduction fi IT Corporation (IT) has prepared this Draft Work Plan for the Division of the State Architect (DSA) under Agreement No. UT 081R, Assignment #2 at the request of Ms. Mary Cooper of DSA. A Final Work Plan incorporating client comments will be submitted to the San Joaquin County Public Health Services Environmental Health.Division (PHS/EHD) for approval prior to permitting and the commencement of field activities. 1.1 Site Description i 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). !, Based on work performed by IT at the San Joaquin Catholic Cemetery site located 1,500 feet north of the subject site, subsurface materials consist of interbedded silty clay and clayey silt with some minor sands to a depth of at least 80 feet below ground surface (bgs). In January 1997, the depth to groundwater at the San Joaquin Catholic Cemetery site was between 45 i and 50 feet bgs. Since 1992, the groundwater surface has risen approximately 20 feet. j i 1.2 Previous Work On August 1, 1996, four 10,000 gallon single-walled steel USTs and associated underground rproduct piping were removed from the site by Ramcon Engineering and Environmental L 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'USTs were transported to Triangle Inc. in Sacramento, California for lawful disposal. � 1