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, .., Appendix II - Detailed Description of Alternative 6: DoFJRl4001-11 Close in Place - Collapsed Structu're Rev. jA^ft_L1 n RC4Jis•L.S:;^kcrn,t 1 Ii.1.4 Modify External Area 2 3 The following modifications would be performed to support partial demolition of 221-U,-and 4 . Before demolition activities 5 on 221-U can begin, the legacy structures that are physically attached to 221-U and those which 6 are located within the environmental cop footprint must first be removed. In addition, prior 7 remediation (by other projects) of waste sites within the footprint of the environmental cap 8 would be verified. 9 10 The Alternative 6 approach conservatively assumes that all demolition debris from the legacy 11 structures would be disposed at ERDF. During final design this assumption could be revisited to 12 determine if decontaminating and recycling steps could be economically included to support 13 DOE waste minimization goals. 14 15 H.1A.1 Disposition of Aboveground Legacy Structures. The aboveground structures 16 identified in Assumption 4 at the beginning of this appendix would be demolished as part of 17 Alternative 6. 18 19 H.1A.1.1 Demolition or the 276-U Solvent Recovery Facility. The 276-U Solvent Recovery 20 Facility, attached to the southwest end of the 221-U Facility, is composed of walkways, tanks, ('\21 and associated piping set in an opentoncrete basin. Decommissioning would involve removing 22 the tanks, walkways, and all aboveground piping. The concrete basin and underground piping 23 would be left in place. All pipe penetrations associated with this structure would be cut, sealed, 24 and capped. Drains would be sealed with concrete. Concrete surfaces would be decontaminated 25 using selected off-the-shelf technologies. 26 27 Tanks, steel framing, and concrete walls and Aeercanyon deck s could be removed concurrently 28 with the canyon cleanout activities. The concrete could be left in place until the canyon is 29 demolished, because considerable excavation would be required for complete removal and it 30 may be more cost effective to do all concrete removal and excavation at the same time. If left in 31 place, the concrete walls should be fenced for worker safety. Demolition debris would be taken 32 to ERDF for final disposal. An option during final design would be to place some of the 33 equipment eithetin cell 34 35 H.1.4.1.2 Demolition of the 271-U Office Building. The northwest side of the building must 36 be leveled to allow access for a very large mobile crane for removal of the canyon roof slab and 37 upper walls. This preparation would begin with demolition of the 271-U Office Building. This 38 building is a concrete framed structure built against the northwest face of the 221-U Canyon. 39 40 There is a basement, three floors, and a reinfotced concrete slab roof. There is a concrete 41 masonry perimeter wall supported on a basement wall, with interior masonry wa11s within the 42 building. The roof is a reinforced concrete slab similar to the floors. The third floor is a ('N 43 chemical makeup area with floor slabs up to 0.3 m(1 ft) thick that support chemical tanks. Final Feasibility Sludyjor the Canyon Disposition lniriotive (221-U Facility) June '100 H-13
Appendix N- Detailed Description of Alternative 6: DoEIiu:200 t-11 Close in Place - Collapsed Structare Rev. to oraft D BeMqVlSqL^9sii 1 Additional building features included in the demolition are a stack on the roof (296-U-10), an 2 elevator, a second floor vault, and mechanical equipment in the basement. Demolition would 3 use typical building demolition techniques. The resulting rubble would be left in place alongside 4 5 221-U and the area filled and compacted for crane access to the canyon. 6 II.1A.1.3 Decontamination and Decommissioning (D&D) of Stairways on 221-U Building. 7 Eight stairwells on the northwest side of 221-U arc light construction and would be demolished 8 using typical building demolition techniques. Ten stairwells on the southeast side of 221-U are 9 thick wall, lightly reinforced concrete construction. The heavy construction of these stairwells is 10 factored into the demolition costs. Any contamination found in the stairwells on the canyon's 1 I southeast side would be fixed in place prior to demolition. All stairwell demolition waste would 12 be disposed at ERDF. 13 14 15 H.IA.lA Disposition of Aboveground Structures. All other aboveground structures identified in Assumption 4 at the beginning of this appendix that are within the footprint of the 221-U 16 17 environmental cap would be decommissioned as part of Alternative 6 activities. 18 11.1.4.2 Demolition of External Piping Around 221-13. Piping not already addressed in the 19 preparation of the complex step would be rrouted in place or removed prior to the placement of 20 ("^\21 22 23 engineered till around 221-U, denendine on the outcome of risk assessment work . In addition to the miscellaneous piping to be removed, the exhaust ventilation tunnel would be removed. This tunnel is a reinforced tunnel connecting the canyon's ventilation tunnel to the stack and filter. The tunnel is approximately 60 m long and tuns from the end of the air tunnel in section 3 to the 24 25 fans. 26 H.1A.3 Confirm Removal of Waste <strong>Site</strong>s Within 221-U Environmental Cap Footprint. 27 Extensive earthwork and excavation would be required to prepare for crane and other demolition 28 equipment access to 221-U. In addition, Alternative 6 includes covering 221-U and associated 29 demolition debris with an environmental cap. It is assumed that the waste sites, as identified in 30 Assumption S at the beginning of this appendix, would be remediated by other projects prior to 31 32 the start of Alternative 6 and construction of the environmental cap. 33 H.IAA Confirm Well Decommissioning. Three wells are located within the footprint of the 34 environmental cap. These wells would be decommissioned as part of Alternative 6. The wells 35 are 299-W 19-8, 299-W 19-55, and 299-W19-98. Their prior removal would be confirmed as part 36 of Alternative 6. 37 38 H.IAS Excavations to Prepare Working Area Adjacent to 221-U. The northwest side 39 40 (271-U and rail tunnel) of the building would be excavated, shaped, and compacted to prepare for removal of the canyon roof panels with a large mobile crane during operations. The 41 excavated area would allow the crane to travel the length of the building and allow sufficient 42 area to lay down roof panels. The ground surface in the laydown area would be shaped to fit the 43 44 underside of the roof panels to minimize voids. Final Feasibility Sradyjor the Canyon Disposition Initiative (121-U Facility) un 3 H-14
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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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! ' 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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