Corrective Action Decision Document/Closure Report for Corrective Action Unit 504: 16a-Tunnel Muckpile, Nevada Test Site

Technical Report · Sun Jul 01 04:00:00 EDT 2007

DOI:https://doi.org/10.2172/1968500· OSTI ID:1968500

This Corrective Action Decision Document (CADD)/Closure Report (CR) was prepared by the Defense Threat Reduction Agency (DTRA) for Corrective Action Unit (CAU) 504, 16a-Tunnel Muckpile. This CADD/CR is consistent with the requirements of the Federal Facility Agreement and Consent Order (FFACO) agreed to by the State of Nevada; U.S. Department of Energy (DOE), Environmental Management; U.S. Department of Defense; and DOE, Legacy Management. Corrective Action Unit 504 is comprised of four Corrective Action Sites (CASs): 16-06-01, Muckpile; 16-23-01, Contaminated Burial Pit; 16-23-02, Contaminated Area;16-99-01, Concrete Construction Waste; Corrective Action Site 16-23-01 is not a burial pit; it is part of CAS 16-06-01. Therefore, there is not a separate data analysis and assessment for CAS 16-23-01; it is included as part of the assessment for CAS 16-06-01. In addition to these CASs, the channel between CAS 16-23-02 (Contaminated Area) and Mid Valley Road was investigated with walk-over radiological surveys and soil sampling using hand tools. The purpose of this CADD/CR is to provide justification and documentation supporting the recommendation for closure in place with use restrictions for CAU 504. A CADD was originally submitted for CAU 504 and approved by the Nevada Division of Environmental Protection (NDEP). However, following an agreement between NDEP, DTRA, and the DOE, National Nuclear Security Administration Nevada Site Office to change to a risk-based approach for assessing the corrective action investigation (CAI) data, NDEP agreed that the CAU could be re-evaluated using the risk-based approach and a CADD/CR prepared to close the site. To support this recommendation, a CAI was performed in May, June, and July 2001. The purpose of the CAI was to fulfill the following data needs as defined during the Data Quality Objective (DQO) process: 1) Determine whether identified contaminants of concern are present within or beneath the Muckpile, the Contaminated Burial Pit, or the Area of Concrete Construction Waste, or at the surface of the Contaminated Area; 2) Provide sufficient information and data to develop appropriate corrective action strategies for the Muckpile and associated CASs to be evaluated in the CADD/CR.

• Research Organization: Defense Threat Reduction Agency (DTRA), Mercury, NV (United States); Nevada Test Site (NTS), Mercury, NV (United States); Stoller-Navarro Joint Venture, Las Vegas, NV (United States)
• Sponsoring Organization: USDOD; USDOE Office of Environmental Management (EM)
• DOE Contract Number: AC52-06NA25946; 89303320DEM000037
• OSTI ID: 1968500
• Report Number(s): DOE/NV--1369; 07-DTRA-012
• Country of Publication: United States
• Language: English

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54 ENVIRONMENTAL SCIENCES