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An analysis of completed decommissioning projects is used to construct predictive estimates for worker exposure to radioactivity during decommissioning activities. The preferred organizational method for the completed decommissioning project data is to divide the data by type of facility, whether decommissioning was performed on part of the facility or the complete facility, and the level of radiation within the facility prior to decommissioning (low, medium, or high). Additional data analysis shows that there is not a downward trend in worker exposure data over time. Also, the use of a standard estimate for worker exposure to radioactivity may be a best estimate for low complete storage, high partial storage, and medium reactor facilities; a conservative estimate for some low level of facility radiation facilities (reactor complete, research complete, pits/ponds, other), medium partial process facilities, and high complete research facilities; and an underestimate for the remaining facilities. Limited data are available to compare different decommissioning alternatives, so the available data are reported and no conclusions can been drawn. It is recommended that all DOE sites and the NRC use a similar method to document worker hours, worker exposure to radiation (person-rem), and standard industrial accidents, injuries, and deaths for all completed decommissioning activities. iv ACKNOWLEDGEMENTS

This document, which is prepared as directed by the Compliance Order on Consent (COOC) issued by the New Mexico Environment Department, identifies and outlines a process to evaluate remedial alternatives to identify a corrective measure for the Sandia National LaboratoriesNew Mexico Technical Area (TA)-V Groundwater. The COOC provides guidance for implementation of a Corrective Measures Evaluation (CME) for the TA-V Groundwater. This Work Plan documents an initial screening of remedial technologies and presents a list of possible remedial alternatives for those technologies that passed the screening. This Work Plan outlines the methods for evaluating these remedial alternatives and describes possible site-specific evaluation activities necessary to estimate remedy effectiveness and cost. These methods will be reported in the CME Report. This Work Plan outlines the CME Report, including key components and a description of the corrective measures process.

This Corrective Measures Evaluation report was prepared as directed by a Compliance Order on Consent issued by the New Mexico Environment Department to document the process of selecting the preferred remedial alternative for Tijeras Arroyo Groundwater. Supporting information includes background concerning the site conditions and potential receptors and an overview of work performed during the Corrective Measures Evaluation. The evaluation of remedial alternatives included identifying and describing four remedial alternatives, an overview of the evaluation criteria and approach, comparing remedial alternatives to the criteria, and selecting the preferred remedial alternative. As a result of the Corrective Measures Evaluation, monitored natural attenuation of the contaminants of concern (trichloroethene and nitrate) is the preferred remedial alternative for implementation as the corrective measure for Tijeras Arroyo Groundwater. Design criteria to meet cleanup goals and objectives and the corrective measures implementation schedule for the preferred remedial alternative are also presented. • Research and development of advanced nuclear reactors,• Simulation sources,• Reactor safety,• Energy-related programs, and• Nuclear weapons systems.The Tijeras Arroyo Groundwater (TAG) study area encompasses approximately 40 square miles (mi 2 ) located on the northwest portion of Kirtland Air Force Base (KAFB) (Figure 1-1). The name of the area is derived from Tijeras Arroyo, which is the most significant surface-water drainage feature within this area. There are three principal parties potentially responsible for groundwater contamination within the TAG study area: SNL/NM, KAFB, and the City of Albuquerque (COA). This Corrective Measures Evaluation (CME) report addresses groundwater contamination in the SNL/NM area of responsibility (AOR) within the TAG study area, as defined in Section 2.2.Groundwater investigations conducted during the last 10 years by the SNL/NM Environmental Restoration Project have identified trichloroethene (TCE) and nitrate as the contaminants of concern (COCs) in the TAG SNL/NM AOR. The New Mexico Environment Department (NMED) issued a Compliance Order on Consent (COOC) (NMED 2004) to the DOE in which TAG was identified as an area of groundwater contamination requiring a CME. The COOC directed that a CME Work Plan be developed to identify and outline a process to evaluate remedial alternatives. The CME Work Plan was formally approved by the NMED in November 2004. Results of activities performed under the TAG CME Work Plan are documented in this CME Report.The purpose of this CME Report is to select a preferred remedial alternative for the SNL/NM AOR based on the results of information gathered during the CME process. The CME was conducted to ascertain which remedial alternative would most effectively meet the project goals and objectives for cleanup within the regulatory framework. The performance and compliance goals and objectives were developed in the TAG CME Work Plan (SNL/NM 2004).This ...

This Corrective Measures Evaluation Report was prepared as directed by the Compliance Order on Consent issued by the New Mexico Environment Department to document the process of selecting the preferred remedial alternative for contaminated groundwater at Technical Area V. Supporting information includes background information about the site conditions and potential receptors and an overview of work performed during the Corrective Measures Evaluation. Evaluation of remedial alternatives included identification and description of four remedial alternatives, an overview of the evaluation criteria and approach, qualitative and quantitative evaluation of remedial alternatives, and selection of the preferred remedial alternative. As a result of the Corrective Measures Evaluation, it was determined that monitored natural attenuation of all contaminants of concern (trichloroethene, tetrachloroethene, and nitrate) was the preferred remedial alternative for implementation as the corrective measure to remediate contaminated groundwater at Technical Area V of Sandia National Laboratories/New Mexico. Finally, design criteria to meet cleanup goals and objectives and the corrective measures implementation schedule for the preferred remedial alternative are presented. I, TA-II, TA-III, TA-IV, and TA-V) (Figure 1-1). TA-V, which has been operating since the 1960s, is a secured 35-acre research and testing area located immediately northeast of TA-III at SNL/NM. The facility conducts research and development of advanced nuclear reactors, simulation sources, reactor safety, energy-related programs, and nuclear weapons systems.The SNL/NM Environmental Restoration (ER) Project has reported concentrations of trichloroethene (TCE) exceeding the U.S. Environmental Protection Agency (EPA) maximum contaminant level (MCL) in samples from TA-V monitoring wells since 1993. Since initial discovery of TCE in groundwater, the ER Project has voluntarily undertaken various activities to determine the nature and extent of groundwater contamination, particularly to identify potential sources of this contamination (SNL/NM 1999). Contaminants of concern (COCs) in TA-V groundwater include TCE, tetrachloroethene (PCE), and nitrate.The New Mexico Environment Department (NMED) issued a Compliance Order on Consent (COOC) (NMED 2004) to the DOE, which among other things identified TA-V as an area of groundwater contamination requiring completion of a Corrective Measures Evaluation (CME).The COOC directed that a CME Work Plan be developed to identify and outline a process to evaluate remedial alternatives for implementation at TA-V. The CME Work Plan was formally approved by the NMED in April 2004 (SNL/NM 2004a). Results of activities performed under the TA-V CME Work Plan are documented in this CME Report.The purpose of this CME Report is to select a preferred remedial alternative for implementation at TA-V based on the results of information gathered during the CME process. The CME was conducted to ascertain which remedial alternative would mo...