Fiscal Year 2010 Phased Construction Completion Report for EU Z2-32 in Zone 2, East Tennessee Technology Park, Oak Ridge, Tennessee

Bechtel Jacobs

East Tennessee Technology Park (U.S.)

关键词: Probability;    Remedial Action;    Information Systems;    Disturbances;    Pccr,Eu Z2-32,Zone 2;   

DOI  :  10.2172/972795
RP-ID  :  DOE/OR/01-2452&D1
RP-ID  :  DE-AC05-98OR22700
RP-ID  :  972795

美国|英语

来源: UNT Digital Library

【 摘 要 】

The Record of Decision for Soil, Buried Waste, and Subsurface Structure Actions in Zone 2, East Tennessee Technology Park, Oak Ridge, Tennessee (DOEIORJO 1-2161 &D2) (Zone 2 ROD) acknowledged that most of the 800 acres in Zone 2 were contaminated, but that sufficient data to confirm the levels of contamination were lacking. The Zone 2 ROD further specified that a sampling strategy for filling the data gaps would be developed. The Remedial Design Report/Remedial Action Work Plan for Zone 2 Soils, Slabs, and Subsurface Structures, East Tennessee Technology Park, Oak Ridge, Tennessee (DOEIORIO 1 -2224&D3) (RDRJRAWP) defined the sampling strategy as the Dynamic Verification Strategy (DVS), generally following the approach used for characterization of the Zone I exposure units (EUs). The Zone 2 ROD divided the Zone 2 area into seven geographic areas and 44 EUs. To facilitate the data quality objectives (DQOs) of the DVS process, the RDR/RAWP regrouped the 44 EUs into 12 DQO scoping EU groups. These groups facilitated the DQO process by placing similar facilities and their support facilities together, which allowed identification of data gaps. The EU groups were no longer pertinent after DQO planning was completed and characterization was conducted as areas became accessible. As the opportunity to complete characterization became available, the planned DVS program was completed for the EU addressed in this document (EU Z2-32). The purpose of this Phased Construction Completion Report (PCCR) is to address the following: (1) Document DVS characterization results for EU Z2-32. (2) Describe and document the risk evaluation and determine if the EU meets the Zone 2 ROD requirements for unrestricted industrial use to 10 ft bgs. (3) Identify additional areas not defined in the Zone 2 ROD that require remediation based on the DVS evaluation results. (4) Describe the remedial action performed in the K-1066-G Yard in EU Z2-32. Approximately 18.4 acres are included in the EU addressed in this PCCR. Based on results of the DVS evaluation, all 18.4 acres are recommended for unrestricted industrial use to 10 ft bgs. There are no Federal Facility Agreement Sites included in Appendix A of the Zone 2 ROD in EU Z2-32. The Zone 2 ROD requires land use controls to prevent disturbance of soils below 10 ft deep and to restrict future land use to industrial/commercial activities. In response to stakeholder comments, the U.S. Department of Energy agreed to re-evaluate the need for such land use restrictions. This document includes a screening evaluation to determine the likelihood of land use controls in EU Z2-32 being modified to: (1) eliminate the restriction on disturbance of soils below 10 ft bgs where data indicate the absence of residual contamination at any depth that would result in an unacceptable risk to the future industrial worker, and (2) permit alternative land uses that would be protective of future site occupants. Results of this screening evaluation indicate a high probability that restrictions on disturbing soil below 10 ft bgs could be safely eliminated for EU Z2-32. A qualitative screening evaluation considered the likelihood of unrestricted land use being protective of future site occupants. Based on this qualitative assessment, all 18.4 acres addressed in this PCCR were assigned a high probability for consideration of release for unrestricted land use. This document contains the main text (Sects. 1 through 13) and one appendix. The main text addresses the purpose for this PCCR as described above. Additional supporting detail (e.g., field work and data summaries, graphics) is provided in the EU Z2-32 technical memorandum (Appendix A). Historical and DVS analytical data used in this PCCR are provided on a compact disc accompanying this document and can be accessed through the Oak Ridge Environmental Information System.