A Composite Analysis is required by U.S. Department of Energy (DOE) Order 435.1 to ensure public safety through the management of active and planned low-level radioactive waste disposal facilities associated with the Hanford Site. A Composite Analysis is defined as "a reasonably conservative assessment of the cumulative impact from active and planned low-level waste disposal facilities, and all other sources from radioactive contamination that could interact with the low-level waste disposal facility to affect the dose to future members of the public." At the Hanford Site, a Composite Analysis is required for continued disposal authorization for the immobilized low-activity waste (ILAW), spent vitrification plant melter components, low-level waste in the 200 East and 200 West Solid Waste Burial Grounds or the Integrated Disposal Facility to be located in the 200 East Area, and Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) waste in the Environmental Restoration Disposal Facility (ERDF). The 2004 Composite Analysis will be a site-wide analysis, considering final remedial actions for the Columbia River Corridor and the Central Plateau. The river corridor includes waste sites and facilities in each of the 100 Areas as well as the 300, 400, and 600 Areas. The "Central Plateau" describes the region associated with operations and waste sites of the 200 Areas. DOE is developing a strategy for closure of the Central Plateau area by 2035. At the time of closure, waste management activities will shrink to a Core Zone within the Central Plateau. The Core Zone will contain the majority of Hanford's permanently disposed waste. Figure 1.1 shows the Core Zone, Central Plateau, Hanford Site (also known as the Columbia River Corridor), and Hanford Reach National Monument. The 2004 Composite Analysis will be a companion site-wide assessment to waste-specific and sitespecific assessments. The 2004 Composite Analysis also will provide supporting information on a regional or site-wide basis for use in important Hanford assessments and decisions such as the CERCLA 5-year review in 2005, tank closure decisions, decisions on final groundwater remedies for the 200 Areas, decisions on final groundwater remedies for the 100 Areas, and the Columbia River corridor final record of decision. The purpose of this document is to describe the technical scope of the 2004 Composite Analysis for the Hanford Site and the approach to perform this analysis. This document describes the performance and data quality objectives, region involved, contaminants of concern, waste sites to be included, scenarios to be evaluated, spatial and temporal domains for the Composite Analysis, and incorporates information from related studies associated with the 2004 Composite Analysis. The 2004 Composite Analysis will be a site-wide evaluation of the potential long-term impact on the health of a hypothetical future member of the public. The human health impact will be evaluated from combined radionuclide releases to groundwater, surface w...
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