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L <br /> Section 2 <br /> L Site Background <br /> L <br /> 2.1 Site Location and Description <br /> The project site is located at the Department of Forestry Castle Rock Forest Fire Station <br /> L (CRFFS), 34580 Corral Hollow in Tracy, California. The site is situated within a relatively <br /> rural area of California, approximately 150 feet south of Lawrence Livermore National <br /> LLaboratory (LLNL) property. A cluster of five monitoring wells is located to the west of the <br /> project area that are associated with activities at LLNL. The Corral Hollow Creek streambed <br /> is located approximately 300 feet southeast/east of the site. The location of the site with <br /> respect to major roads and intersections is presented in Figure 1. <br /> LThe project area involves the former location of a 550-gallon diesel UST. Specifically, the <br /> UST was located adjacent to a storage shed, in an unpaved area of the Fire Station. <br /> Approximately 10 yd3 of soil excavated during the UST removal is currently stockpiled <br /> approximately 200 feet east of the UST. Figure 2 presents the location of the former UST and <br /> Lthe stockpiled soil. <br /> 2.2 Removal of 550-Gallon Tank <br /> Based on information provided by the DSA, one 550-gallon diesel UST was removed from the <br /> LForest Fire Station on June 29, 1993 by Tank Protect Engineering. A review of available <br /> analytical data reports that two samples (N-1, S-1) were collected from the tank excavation and <br /> one sample was collected from the soil stockpile (SP-1) at the time of removal. Samples were <br /> analyzed for Total Petroleum Hydrocarbons (gasoline & diesel fractions) by EPA Method <br /> M8015, BTEX (benzene, toluene, ethylbenzene, and total xylenes) compounds by EPA <br /> L Method 8020, ethylene dibromide by EPA 8240 and Total Lead. <br /> LSamples collected from the diesel tank excavation reported a maximum concentration of 3.3 <br /> ppm TPH-diesel and 46 ppm total lead. Gasoline-based compounds, (TPH or BTEX) and <br /> Lethylene dibromide were not detected above laboratory detection limits in the samples from <br /> i <br /> ► r <br /> L <br /> TETRA TECH:Castle Rock Forest Fire Station,Preliminary Site Assessment Rq*ft Page 2 <br /> `1 <br /> L <br />