This data package discusses the geology of the single-shell tank (SST) farms, relating the site-specific geology to the regions geologic history. The purpose of this report is to provide the most recent geologic information available for the SST farms and the Integrated Disposal Facility (IDF). This report builds upon previous reports on the tank farm geology (Reidel et al. 2006) and IDF geology (Reidel 2005) with information available after those reports were published. Horton (2007) recently published a companion report to this one that discusses the groundwater flow and contamination beneath the SST farms. The Hanford Site lies within the Columbia Plateau, a broad plain situated between the Cascade Range to the west and the Rocky Mountains to the east, and is underlain by the Miocene Columbia River Basalt Group (CRBG). The northern Oregon and Washington portion of the Columbia Plateau is often called the Columbia Basin because it forms a broad lowland surrounded on all sides by mountains. In the central and western parts of the Columbia Basin and Pasco Basin where the Hanford Site is located, the basalt is underlain predominantly by Tertiary continental sedimentary rocks and overlain by late Tertiary and Quaternary fluvial and glaciofluvial deposits. All these were folded and faulted during the Cenozoic to form the current landscape of the region.
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