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t^ 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 (72 1 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ('\43 44 APPENDIX H DETAILED DESCRIPTION OF ALTERNATIVE 6: CLOSE IN PLACE - COLLAPSED STRUCTURE DOFJRL-2001-11 Rev. 19 nraU Redline/Sarikcout This appendix presents a description of details for the Alternative 6 dispositioning of the 221-U Facility. This alternative involves the disassembly and demolition of the 221-U Facility to approximately its canyor„deck elevation. Building demolition debris would be placed adjacent to and within the 221-U footprint. Available space within the ^taining SIFUNM aan y2n process ce ll s would be used for disposal of and process cells . After waste-equipment placement, remaining voids in tanks. around the ggainment. and in the remaining 221 -U structure would be filled with grout. The intent of the grouting is to minimize the potential for 221-U slab or wall movement. The grout also would provide uniform support for waste and/or soil placed above the cells and gallery slabs. The building and demolition debris would be protected from water infiltration by an engineered barrier. The engineered barrier would be placed on top of engineered fill that would cover the building and debris. The side slopes of the engineered fill would be constructed with an erosion protection layer. Together, these three elements make up the environmental cap. Structures attached to 221-U and adjacent structures located within the footprint of the environmental cap would be demolished as part of this alternative. Waste sites located within the cap footprint would be remediated by others prior to the stan of Alternative 6 activities. Alternative 6 would be implemented in coordination with cleanup of the U-Planr ClasureArea. The U Plant Closure Area remediation approach is described in a focused feasibility xtudy fDOE-RL 2003) and includes-thc remediation of waste sites: removal actions for associated The following key assumptions have been made in the development of this alternative: 1. This alternative does not include remediation of waste sites within the perimeter of the environmental cap. It is assumed that these sites would be addressed by other projects in time to implemcnt Alternative 6. Rcmediation of waste sites beyond the Alternative 6 environmental cap footprint are outside the Alternative 6 scope and would be addressed by future projects using the remedial action alternative selected for the appropriate 200 Area operable unit. For cost-estimating putposes, it is assumed that there are no contamination plumes above Washington ,9dmiqistrative Cade fWACI 173-34 {-kFFC.A) industriallintits associated with the Alternative 6 activities. During Alternative 6 activities (such as buried pipe and exterior air tunnel removal), i f soil contamination above NMA WAC 173-340 industrial limits is identified, then the Tti-Parties would need to evaluate the situation and decide whether to remove the contamination. Contaminated Final Fearibility Study jor the Canyon OrJposirlon lniriaNve (221-U Facility) 1 00.1 H-1
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ^21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 r"`%43 44 Appendix Ii - Detailed Description of Alternative 6: DoEIR1.-2o01-11 Close in Place - Collapsed Structure Rev. jA ra RedlinclStrikegut equipment and piping from demolition activities would be disposed at the Environmental Restoration Disposal Facility (ERDF). 2. For removal and hauling to ERDF, remediation waste would be in accordance with ERDF waste acceptance criteria (BF1I 1997, 2001b), and comnliance with size and weight reouirements would be coordinated with ERDF operations staff during final design if this alternative is selected. Unless otherwise noted in this appendix, wastes from legacy structure removal and removal of the operating gallery equipment and piping would be disposed at ERDF. 3. No surface contamination removal is necessary for Alternative 6. All concrete surfaces would receive applications of fixative. 4. Attached facilities to be decontaminated and decommissioned in support of implementation of Alternative 6 are the 221-U Facility (partial demolition including the railroad tunnel), 271-U Office Building, and 276-U Solvent Recovery Facility. In addition, aboveground facilities that are within the footprint of the Alternative 6 environmental cap would be removed as part of the Alternative 6 activities. These facilities are the 211-U and 211-UA Tank Farms, 241-WR Vault Thorium Storage. 2714-U Warehouse, 275-UR Chcmical Storage Warehouse, 200-W-44 Sand Filter, 291-U Process Unit Plant, 291-U-1 Stack, 292-U Stack Monitoring Station, 296-U-10 Stack, 222-U Office Lab, 224-U Concentration Facility, and 224-UA Calcination Facility. The remediation or these facilitiec Is to be nerfotmed by others and, therefore, such remediation work Is not accounted for In the Alternative 6 cost estimate. Ilowever, disonsition and removal of the same racllities 5. Waste sites that are within the footprint of the Alternative 6 environmental cap and must be remediated by other projects in time to support Alternative 6 include the 216-U-4 Reverse Well; 216-U-4A French Drain; 216-U-7 French Drain; 216-U-15 Trench; 224-U-HWSA; 224-U CNT; 241-UX-154 Diversion Box; 241-UX-302A Catch Tank; 2607-W-7 Septic Tank and Drain Field; unplanned releases (UPRs) UPR 200-W-39, UPR 200-W-55, UPR 200-W-60, UPR 200-W-78, UPR 200-W-101, UPR 200-W-1 17, UPR 200-W-118, UPR 200-W-125, UPR 200-W-138, and UPR 200-W-162; and portions of process lines associated with 200-W-42, 200-W-84, and UPR-600-20. Three wells are located within the footprint of the environmental cap: wells 299-W 19-8, 299-W 19-55, and 299-W19-98. It is assumed that these wells would be decommissioned prior to the start of Alternative 6. This work acppejs not included in the cost estimate. 6. Removal, decontamination, and demolition operations for contaminated equipment being stered-insidc of 221-U would be performed using conventional, proven technologies. Final Feasibitiry Srudyjor the Canyon Disposition lniriative (221-U Facility) J un e 2003 H-2
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AR TARGET SHEET The following docum
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(^N r^ r Proposed Plan for the Cany
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^ (^N t^ the steHitFths+amedielaeti
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o"N DOF/RIr2001-29 Draft D Redline/
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(^N i0,"% / ' DOF/RL-2001-29 Draft
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! ' t^ Project Prepare the existing
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f ' ^ rN 100 I Noise, Visual, and A
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^ POINTS OF CONTA CP ^ U.S. Drnartm
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f^ n DOF/RL-2001-29 Draft D Redlinc
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noFIRL-2001-11 Rev. p 1 1)raft P ^
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Appendix D- Slope Stability Analysi
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^ r^, TABLES DOFJRIr2001-11 • Rev
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