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l <br /> 2.0 SITE BACKGROUND <br /> Tank #3 is an 8,500 gallon bunker fuel tank .located at the west-central .area of Stockton <br /> Developmental Center. The UST is located between a water tower and a laundry. /classroom <br /> building. . The UST system includes approximately 90 feet of piping that -.connects the <br /> underground tank to a boiler room. The location of the Stockton Developmental� _ r tal Ccntcr with <br /> respect to major roads and intersections is presented in Figure 1. A site overview of the tank and <br /> interpreted piping location is presented in Figure 2. <br /> A complete site history was not available for review; however, available data indicates that the <br /> UST was taken out of service and abandoned in place. In May 1991, prior to abandoning the <br /> UST, a soil boring program was implemented by West & Hansen Engineers, Inc. Two 20-foot <br /> soil borings were drilled at the east and west ends of the boiler tank to determine if petroleum <br /> compounds from the tank had impacted the surrounding subsurface soil. Approximate boring <br /> locations are presented.in Figure 3. The two borings, designated B 1 and B2, were drilled at an <br /> angle in order to collect soil samples directly beneath the UST. The 15-foot sample collected <br /> from B 1 (Sample B 1-1) reported a total TPH concentration of 4,000 mg/kg using EPA Methods <br /> 8260 and 8270, respectively. <br /> Based on correspondence from PHS/EHD, the hydrocarbon concentrations detected during the <br /> preliminary site assessment exceed the recommended Leaking Underground Fuel Tank (LUFT) <br /> action levels. PHS/EHD is currently directing further site investigation to delineate the vertical <br /> and lateral extent of contamination around the tank." Based on verbal communication with Mr. <br /> Steve Sasson of PHS/EHD, the scope of additional ;investigation should include.assessment of <br /> the 90-foot length of piping that leads to the boiler room. Site documentation and .regulatory` correspondence associated with the project area are included in Appendix B. <br /> L` <br /> TETRA TECH:Stockton Developmental Center,Revised Site Investigation Work Plan Page 2 <br />