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(^N Appendix E - Detailed Description of Alternative 1: DOF/R1.-2001-1I I Full Removal and Disposal Rev. o raft t; Redlinelstrikeout 1 would be designed for equipment disassembly, dccontamination, and packaging of large items in 2 a controlled environment. Disassembly activities would include mechanical and flame cutting, 3 hydraulic shearing, and manual methods. Additional technologies that could be applied are 4 described in Appendix 1. Equipment and materials would be transferred into and out of the 5 enclosure with the main overhead crane. 6 7 The most significant contribution to worker exposure under Alternative I would be the size 8 reduction and packaging of the contaminated legacy equipment that is currently within the 9 221-U Facility. Estimated worker dose for these activities alone is nearly 200 pcrson-rem (BFA 10 2001a). If all of the legacy equipment is volume reduced for shipment, significant worker time 11 and resulting higherexposures would occur. This activity, even with latest technologies 12 available, would be performed in personal protective equipment-required work areas (i.e., 13 contaminated areas and airborne areas). Significant engineering controls would be required to 14 reduce worker exposure from external and internal exposure sources. Worker turnover could 15 increase due to harsher working conditions. The preliminary ALARA estimate (BHI 2001 a) 16 considered technology currently available. 17 18 E.19.4 Hot Pipe Trench. After the anvon deck can support work 19 activities, equipment currently stered in the process cells could be prepared for removal. The 20 equipment would require the same level of planning and disposition approach as the eanyon ^21 deck equipment. Based on review of available historical photographs, the 22 hot pipe trench contains small-diameter piping. Piping could be removed by cutting a section 23 free, ensuring it is empty, then crushing the cut ends. It would be removed, size reduced as 24 necessary, wrapped, and placed into the modular containers ready for hauling and disposal at 25 ERDF. 26 27 E.13S Remove Surface Contamination. To safely enter the building during its operational 28 phase in this alternative, contamination survey results would be used to identify where 29 decontamination activities are needed. Contamination would either be removed or fixed to the 30 canyon surface to reduce the dose rate and contamination risk to the lowest possible level. It is 31 assumed that water jet, water blasting, or water flushing are practical on the canyon's interior 32 because the waste water could be collected in cell 10 and disposed of in the 200 Area's Liquid 33 Effluent Remediation Facility. Scarifying may be required on some areas. 34 35 After the building has been surveyed and the contamination removal planned, the work would 36 require scaffolding and wastewater collection systems to be installed and maintained, and 37 disposal of wastewater during and after decontamination. 38 39 E.1.3.6 F'ix Contamination on 221-U Interior Surfaces. It is assumed that surface 40 contamination on the canyon walls, Aeercanyon deck s, and ceiling could be addressed with 41 application of a fxative. Fixative would also be applied to all of the interior surfaces of the pipe 42 trench, process cells, craneway, and vent tunnel. >'\43 Final Feasibility Siady for rite Canyon Disposirion Initiative (221 •U Faeiliry) J une 2 00-1 E-9
Appendix E - Detailed Description of Alternative 1: DOE/lu.2001-1 l I Full Removal and Disposal Rev. e Lpsaft n ^ Redlinc/SUikeout 1 E.1.4 Modify External Area 2 3 The following modifications would be performed to support full removal and disposal of the 4 221-U Facility. Before demolition and removal of 221-U can begin, the legacy structures that 5 surround the exterior of 221-U must first be removed. Demolition of 221-U would involve a 6 large excavation to remove the foundation slab and the cell drain. Waste sites would be removed 7 that are within the limits of this excavation. 8 9 The Alternative 1 approach conservatively assumes that all concrete demolition debris would be 10 disposed at ERDF. During final design this assumption could be revisited to determine if 11 decontaminating and recycling steps could be economically included to support DOE waste 12 minimization goals. 13 14 E.I.A.I. Disposition of External Legacy Structures and Systems. These structures include 15 276-U. 271-U, 211-U, 211-UA, and the access stairs into 221-U. 16 17 E.1.4.1.1 Demolition of the 276-U Solvent Recovery Facility. The 276-U Solvent Recovery 18 Facility, attached to the southwest end of the 221-U Facility, is composed of walkways, tanks, 19 and associated piping set in an open-concrete basin. Decommissioning would involve removing 20 the tanks, walkways, and all aboveground piping. The concrete basin and underground piping i^'21 would be removed. Concrete surfaces would be decontaminated using selected off-the-shelf 22 technologies. 23 24 Tanks, steel framing, and concrete walls and floors could be removed concurrently with the 25 canyon cleanout activities. The concrete could be left in place until the canyon is demolished, 26 because considerable excavation is required for complete removal and it may be more cost 27 effective to do all concrete removal and excavation at the same time. if left in place, the concrete 28 walls should be fenced for worker safety. Demolition debris would be taken to ERDF for final 29 disposal. 30 31 E.1.4.1.2 Demolition of the 271-U Office Building. The northwest side of the building must 32 be leveled to allow access for a very large mobile crane for canyon demolition. This activity 33 would begin with demolition of the 271-U Office Building. The building is a concrete framed 34 structure built against the northwest face of the 221-U Canyon. 35 36 The 271-U Office Building consists of a basement, three floors, and a reinforced concrete slab 37 roof. There Is a concrete masonry perimeter wall supported on a basement wall, with interior 38 masonry walls within the building. The roof is a reinforced concrete slab similar to the floors. 39 The third floor is a chemical makeup area with floor slabs up to 0.3 m thick that support 40 chemical tanks. Additional building features included in the demolition are a stack on the roof 41 (296-U-10), an elevator, a second floor vault, and mechanical equipment in the basement. 42 Demolition would use typical building demolition techniques. Building 271-U demolition debris (O'N43 would be stockpiled and used for backfill of the 221-U excavation. After demolition of 271-U, 44 the building footprint would be leveled and compacted as necessary for crane access across this 45 area. Final Feasi6iiiry Study jor die Canyon Disposition Initiative (221 •U Facifity) me200 3 E-10
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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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^N r^ 1 n DOF/RLr2061-1 l ' Rev. I
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1 ^ (^N ^ DoFJRL-M-t t ^ Rev. I Dnf
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Appendix G -Detailed Description of
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^ ^ t"'^N 1 2 DOElRL-2001-I1 Rev. 9
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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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^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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^ Appendia J- Applicable or Relevan
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