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• Suppl ntal Site Investigation Scoping Document Pittman Elementary School,Stockton,California January 23,2004 Page 2 and managed by Grupe Commercial Company. The southern portion of the site is the location of a warehouse, a transportation building, the historic Grant House with a small associated shed, a Pacific Gas & Electric (PG&E) electrical substation, a restroom facility, a sewer screening station, drug abusers' rehabilitation houses (rehab center), and a parking area. Seven residences are located in the northwestern portion of the site. A lawn-covered park area is located immediately east of the residences. A hydraulic elevator is located inside the transportation building on the site. Lead-based paint and asbestos may be associated with the structures located on site. Research into the site history revealed that APN 139-210-04 was historically used for institutional purposes as a state hospital and a developmental center. Additionally, gas field maps indicate that the site is located within the Stockton Gas Field with several plugged and abandoned gas wells located in the vicinity of the site. Condor reviewed five aerial photographs dated 1938, 1952, 1963, 1975, and 1983 of the site and surrounding area at the San Joaquin County Surveyor's Office. Aerial photographs indicate that land use in Stockton in the vicinity of the site has been urban since at least 1938. The northwestern portion of the site appears to have been used as a lawn-covered park area continuously since 1938. 2.2 PRIOR ASSESSMENTS AND DTSC DETERMINATION The Geological and Environmental Hazards Assessment Report, dated August 7, 2002, identified five recognized environmental conditions [past application of pesticides, the continuing subsurface investigation of an underground storage tank formerly located at the site, the possibility of polychlorinated biphenyl (PCB)-containing material associated with the hydraulic elevator located in a storage building on the site, the past use of PCB-containing fluid in the electrical switching stations, and the potential presence of hazardous substances in the steam-tunnel system] and three de minimis conditions [the stockpiles of soil with concrete debris stored southeast of the site, the presence of a sewer screening station on the site, and the PG&E electrical distribution station using PCB-containing oil located immediately east of the site] associated with the site. Based on the findings of the Geological and Environmental Hazards Assessment Report, Condor prepared the Preliminary Environmental Assessment Work Plan, dated April 21, 2003 and revised July 2, 2003. The work plan was approved by DTSC on July 28, 2003. Fieldwork for the PEA occurred from August 6 through August 20, 2003. The results of the PEA were discussed in the Preliminary Environmental Assessment Report dated December 10, 2003. A summary of the PEA sampling and analyses is presented in Table 1. i is CONDOR