Integrated Closure and Monitoring Plan (DOE, 2005a). The major updates to the plan include a new closure schedule, updated closure inventory, updated site and facility characterization data, the Title II engineering cover design, and the closure process for the 92-Acre Area of the RWMS.The format and content of this site-specific plan follows the Format and Content Guide for U.S. Department of Energy Low-Level Waste Disposal Facility Closure Plans (DOE, 1999a The Area 5 RWMS accepts primarily packaged low-level waste (LLW), low-level mixed waste (LLMW), and asbestiform low-level waste (ALLW) for disposal in excavated disposal cells.The Area 5 RWMS covers 293 hectares (724 acres) and is bounded by a buffer zone 300 meters (1,000 feet) wide. The southeast and northeast quadrants of the RWMS are actively used for disposal of wastes, although many of the disposal units in the southeast quadrant, the 92-Acre Area, are operationally closed or nearing capacity. The northeast quadrant is being developed and is referred to as the "Expansion Area." NNSA/NSO is currently planning to close the 92-Acre Area in 2011. Closure planning for this site takes into account the regulatory requirements for a diversity of waste streams, disposal and storage configurations, disposal history, and site conditions. Activities associated with final closure of the 92-Acre Area are scheduled to be completed in fiscal year (FY) 2011. Activities associated with final closure of the Area 5 RWMS are scheduled to start in FY 2028 and be completed in FY 2029.The 92-Acre Area contains 25 shallow excavated pits and trenches and 13 Greater Confinement Disposal (GCD) boreholes. The pits and trenches range in depth from approximately 4.6 to 14.6 m (15 to 48 ft). A small quantity of classified transuranic (TRU) materials was inadvertently buried in one trench in 1986. The GCD boreholes are intermediatedepth disposal units, 3 to 3.7 m (10 to 12 ft) in diameter and about 36 m (120 ft) deep. Unclassified GCD boreholes include high-specific-activity LLW, whereas the classified GCD boreholes include high-specific-activity low-level, TRU, and mixed TRU (MTRU) wastes.With the exception of three disposal units, all of the pit and trench disposal/storage units within the 92-Acre Area are covered with operational covers made up of native soil approximately 2.4 m (8 ft) thick. Pits P03U, P06U, and P09U are active.