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SCOPE OF WORK <br /> Underground storage tank (UST) 830-D1 U1 adjacent to Building 830 <br /> will be closed by excavation and removal. The site for excavation <br /> will be cordoned off for the protection of other LLNL personnel. Fuel <br /> product lines were flushed back into the tank, and UST 830-D1 U1 <br /> was emptied and decontaminated. Asphalt surfacing above the tank <br /> will be removed and the tank will be excavated. Solid carbon dioxide <br /> (dry ice) will be introduced into the tank to displace oxygen within <br /> the tank. When the oxygen level within the tank is at or below 10%, <br /> the tank will be removed and along with the piping (approximately <br /> 40 feet) transported as hazardous waste to a recycler or a disposal <br /> facility. If a concrete anchor pad is present beneath the tank, it will <br /> be removed as part of this tank closure. Soil samples will be <br /> collected by LLNL's Environmental Protection Department (EPD) for <br /> laboratory analysis. Soil will be stockpiled on and covered by <br /> polyethylene sheets. The excavation, trenches and stockpiled soil <br /> will be secured with barricades pending the analysis of the soil <br /> samples and subsequent review of the laboratory results by the LLNL <br /> EPD. <br /> -SITE ORGANIZATION <br /> Site Safety Officer (SSO): <br /> Stan Pereira <br /> (LLNL Labor Shop Supervisor) <br /> • Responsible for implementing the project and obtaining any <br /> necessary personnel or supplies to complete the project safely <br /> and in a timely manner. <br /> • Monitors adherence to the SHASP and halts site operations if <br /> the SHASP is being violated or if a hazardous condition arises <br /> at the site. <br /> Contractors (Company) <br /> (Supervisor) <br /> (Workers) <br /> (Company) <br /> (Supervisor) <br /> (Workers) <br /> D-2 <br />