The North Disposal Trench, located north of the eastern most lagoon, was installed in 1963 to receive solid waste and construction debris from the Operation Roller Coaster man camp. Subsequent to Operation Roller Coaster, the trench continued to receive construction debris and range cleanup debris (including ordnance) from Sandia National Laboratories and other operators. A small hydrocarbon spill occurred during Voluntary Corrective Action (VCA) activities (VCA Spill Area) at an area associated with the North Disposal Trench Corrective Action Site (CAS). Remediation activities at this site were conducted in 1995. A corrective action investigation was conducted in September of 1996 following the Corrective Action Investigation Plan (CAIP); the detailed results of that investigation are presented in Appendix A. The Roller Coaster Lagoons and North Disposal Trench are located at the Tonopah Test Range (TTR), a part of the Nellis Air Force Range, which is approximately 225 kilometers (140 miles) northwest of Las Vegas, Nevada, by air.

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Of the 282 ships in the Navy at the end of FY2005, 54 were nuclear-powered attack submarines (SSNs). The Navy is planning to maintain in coming years a fleet of 313 ships, including 48 SSNs. The FY2007-FY2001 Future Years Defense Plan (FYDP) proposes maintaining the one-per-year procurement rate through FY2001, and then increasing the rate to two per year in FY2012. Issues for Congress include the following: Is 48 the correct number of SSNs to meet future needs? Should the start of two-per-year Virginia-class procurement be accelerated from FY2012 to an earlier year, such as FY2009, so as to come closer to maintaining a force of 48 SSNs in the 2020s-2030s? How should the submarine design and engineering base be maintained in coming years?