Evapotranspiration Cover for the 92-Acre Area Retired Mixed Waste Pits. Area 5 Waste Management Dvision Nevada National Security Site. Final CQA Report

摘要

This Final Construction Quality Assurance (CQA) Report is for the 92-Acre Evapotranspiration Cover, Area 5 Waste Management Division (WMD) Retired Mixed Waste Pits, Nevada National Security Site, Nevada for the period of January 20, 2011 to January 31, 2012, Construction was approved by the Nevada Division of Environmental Protection (NDEP) under the 'Approval of Corrective Action Decision Document I Corrective Action Plan (CADD/CAP) for Corrective Action Unit (CAU) 111: Area 5WMD Retired Mixed Waste Pits, Nevada National Security Site, Nevada, on January 6,2011, pursuant to Subpart XI1.8a of the Federal Facility Agreement and Consent Order, The project is located in Area 5 of the Radioactive Waste Management Complex (RWMC) at the Nevada National Security Site (NNSS), formerly known as the Nevada Test Site, located in southern Nevada, approximately 65 miles northwest of Las Vegas, Nevada, in Nye County, The project site, in Area 5, is located in a topographically closed basin approximately 14 additional miles north of Mercury Nevada, in the north-central part of Frenchman Flat The Area 5 RWMS uses engineered shallow-land burial cells to dispose of packaged waste. The 92-Acre Area encompasses the southern portion of the Area 5 RWMS, which has been designated for the first final closure operations, This area contains 13 Greater Confinement Disposal (GCD) boreholes, 16 narrow trenches, and 9 broader pits, With the exception of two active pits (P03 and P06), all trenches and pits in the 92-Acre Area had operational covers approximately 2.4 meters thick, at a minimum, in most areas when this project began.