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Appendix F-Detailed Description of Alternative 3: DOFJRL-2001-I I Entombment with Internal Waste Disposal Rev. e rafi B ^,, Rcdlinc/5trikeout I 2 3 4 F.1.4.S Earthwork to Prepare Working Area Adjacent to 221-U. Following removal of aboveground structures and associated buried piping, the area surrounding 221-U would be leveled and compacted in preparation for placement of the engineered fill. The subgradc compaction and fill placement are the first steps for construction of the environmental cap. 5 6 R1.5 Manage Hazardous Materials 7 8 9 10 11 12 ^ Dangerous waste, asbestos, polychlorinated biphenyls, and other hazardous materials would be removed from all areas of the complex and managed in accordance with ARARs. AII waste faeterraiswaste would be sampled, tested, and designated as required by ARARs. and treated prior to disposal. Products consisting of or containing hazardous materials would be used and managed in accordance with their respective Material Safety Data Sheets. WssiefngetielsWaste 13 14 would be treated as required. 15 A temporary waste accumulation laydown area would be established to facilitate shipment and 16 disposal activities. This area would conform to established requirements for the maintenance, 17 18 accountability, inventory, labeling, and transportation of waste to approved disposal facilities. 19 20 F.2 OPERATE THE COMPLEX ^Zl 22 23 24 25 26 27 28 29 30 31 32 Operation of the complex for Alternative 3 refers specifically to waste acceptance and placement inside the three galleries and on the eanyon , deekggny2n deck of 221-U. Engineered fill would be installed around the exterior of 221-U as waste is placed inside it. In the preceding function, the area surrounding 221-U would have been prepared to support construction of the environmental cap, all equipment that would interfere with placement of containerized waste would have been placed in the process cells or removed, and exposed surfaces inside the canyon would have been decontaminated or a fixative applied. The roofing on 221-U would also be replaced to minimize the potential for precipitation entering the building during the operational phase of this alternative. The steps to operate the complex are discussed below. 33 34 35 36 37 38 39 40 The volume of waste placed inside the 221-U Building in Alternative 3 is estimated as 13.500 m3 (17,500 yd3). This includes 3,400 m3 (4,400 yd) of legacy equipment placed inside theprocess ceils,1,500 m3 (2,000 yd) of waste inside containers in the three galleries, and 8,600 m (11,200 yd3) of waste placed on the operating deck and craneway. An estimated 51.200 m3 (67,000Aof grout would be used in this alternative to surround the waste and fill voids in the process cells, hot pipe trench, galleries, canyon deck/craneway, and the building's ventilation tunnel. 41 42 (0,N3 44 In the Phase I FS, consideration had been given to reserving the process cells only for disposal of Class C wastes at 221-U because of the high degree of isolation and shielding provided by the process cells. However, i n this final FS, there is a need to clear the operating deck to support Final Feasibility Studyfor the Cwqon Disposition lnitiative (221 •U Facility) )ine200 F-15
Appendix E- Detailed Description of Alternative 3: Do1JR1:2o0t-t 1 Entombment with Internal Waste Disposal Rev. e1_pmrL Rcdline/Strikcout I building demolition. The removal and disposal of legacy equipment to the process cells would 2 be the most efficient means of achieving this objective. Moreover, while the process cells would 3 4 provide a significant amount of isolation in 221-U as it is currently configured, after closure activities for Alternative 3, all parts of the 221-U Facility containing waste fill, regardless of the 5 6 7 class of waste within, would be equally protected (contained) by an engineered barrier. Therefore, from the standpoint of long-term protectiveness, there is no advantage in reserving the process cells exclusively for Class C waste. However, cell 3 could have room for placement of 8 9 waste-meterialswaste in addition to legacy waste from the canyon fleor ec c. 10 11 F.11 Emplace Waste In 221-U Galleries 12 Waste placement would start with container placement in the galleries. The waste would be in 13 open-top cargo containers that would be placed on an individual steel frame with casters. Small 14 rails would be installed on the gallery walls to guide the containers on a one-way trip into the 15 galleries. Equipment and piping in the galleries that prevents container placement would be 16 removed. After the waste containers are in place, each gallery would be grouted to provide 17 support for the wastes and the environmental cap. 1s 19 Waste would be placed first in the lowest (electrical) gallery. In preparation, the south end wall -0 .r \ 1 22 23 24 25 of the gallery, located in the 276-U Solvent Recovery Facility, must be exposed. The concrete slab adjacent to the end wall would be cleared to allow vehicle access to the lowest gallery. A temporary structure would be erected so that containers could be prepared outside of the galleries. The concrete masonry unit block end wall must be removed and enlarged for waste container access. A new rollup door would be installed on this opening. The doorways from the 271-U Office into the galleries could be left open to provide emergency egness, but would 26 eventually be filled. A ventilation system for the galleries must remain functional during waste 27 28 placement and grouting. 29 F.2.1.1 F311 Electrical Gallery with Containerized Waste. Waste would arsive at the south 30 end of the canyon by truck in cargo containers (see assumptions for description) and would be 31 lifted onto dollies staged at the open gallery end. They would be pushed as far as possible into 32 33 34 35 the gallery with an electric forklift and then secured in place to prevent movement during grouting. The total length of the electrical gallery is separated by the railroad tunnel in two segments. The main segment of the electrical gallery on the south side of the railroad tunnel is 225 m (740 ft) in length. This gallery segment could hold approximately 37 containers. 36 A spacing of 6 m (20 fi) on center for the 5-m ( 16-ft) containers was assumed to allow for dolly 37 length and container placement. 38 39 40 41 There is a short segment of the electrical gallery on the north side of the rail tunnel. This gallery segment is about 12 m(40 ft) long and could store, at most, one container. The best use of this space would be to place loose material that is too long or tall to be placed in a container. 42 A possible use for this space would be disposal of material from demolition of the 276-U Solvent ('13 Storage Facility. After waste placement, this short segment would be closed off with forms and 44 grouted from the pipe gallery level. Final Feasibility Srwty for the Cartyvrr Disposlrioa lniriative (221 •U Faclfiry) lone'!0oJ F-16
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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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I f^ ^ DOE!RL-2001-29 Ikaft D Redli
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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 C - Risk Modeling
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t^ Appendix C - Risk Modeling of an
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1 ' ^ ^ DOEJRL-2001-1 t Rev.H1 nraf
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Appendix D- Slope Stability Analysi
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Appendix D - Slope Stability Analys
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(^N Appendix D- Slope Stability Ana
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t^N (M"N Final Feasibifity Stady ja
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,.r.. . Appendix H - Detailed Descr
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Appendix N- Detailed Description of
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Appendix It - Detailed Description
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^N i ' (0-1% C Appendix H- Detailed
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^ DOF/RL-2001-11 I Appendix I - Dec
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^ r^, TABLES DOFJRIr2001-11 • Rev
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^ Appendix J- Applicable or Relevan
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