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1.0 INTRODUCTION <br /> LOn behalf of the State of California, Division of the State Architect (DSA), Tetra Tech, Inc. has <br /> prepared the following technical work plan to conduct a hydropunch water sampling program at <br /> the Castle Rock Forest Fire Station, 34580 Corral Hollow, Tracy, California 95376. This work <br /> plan has been outlined to comply with criteria outlined'by the State Water Resources Control <br /> Board concerning investigation of underground storage tanks. <br /> Petroleum hydrocarbons and lead were detected in the soil around a former 550-gallon diesel <br /> underground storage tank (UST). The objective of the following proposed sampling program is <br /> to determine if petroleum compounds from the tank have impacted local groundwater. The work <br /> will be conducted by completing a single soil boring through the center of the tank cavity. On- <br /> site screening will be conducted throughout the boring to assess the presence of volatile organic <br /> compounds in the soil. One hydro-punched groundwater sample will then be collected for <br /> laboratory analysis of Total Petroleum Hydrocarbons, by EPA method 8015M (diesel fractions), <br /> Aromatic Volatile Organics by EPA 8020 and Total Lead by EPA 7420. Data acquired during <br /> the sampling program will be used to provide a basis for conducting any further action. <br /> The following workplan provides a brief description and history of the site, and presents the <br /> proposed field methodology for the site investigation. A site-specific Health and Safety Plan is <br /> presented in Appendix A. <br /> L <br /> TETRA TECH:Castle Rock Forest Fire Station,Revised Technical Work Plan Page 1 <br />