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Appendix G - Detailed Description of Alternative 4: DoEIRIr2001-11 { Entombment with Internal and External Waste Disposal Rev. I Draft [1 RedlindStrikeout 1 Personnel and equipment leaving the site present a risk of contaminant migration. This risk 2 would be mitigated by procedural and physical measures. Work procedures would require 3 equipment used on the site and exposed to dangerous/radioactive wastes to be decontaminated 4 before the equipment is released. Personnel working at the site would wear proper protective 5 clothing. Protective clothing exposed to dangerous/radioactive wastes would be controlled in 6 accordance with Hanford Site procedures. Personnel leaving radiologically contaminated areas 7 would require an exit survey before leaving. 8 9 Hazardous materials are expected to present minimal hazard to personnel or the environment. 10 ^ All avestefnatetie4swostc would be sampled, tested, and designated as required by applicable or 11 relevant and appropriate requirements (ARARs) and applicable waste acceptance criteria. 12 13 G.1.2 Establish Infrastructurc 14 15 Implementation of Alternative 4 remediation activities would rely heavily upon the existing 16 221-U Facility complex infrastructure. Some modification of the existing building and utilities 17 would be necessary to support this alternative. These and other mobilization such as preparation 18 of staging areas would be necessary to prepare the complex to support Alternative 4 activities. 19 G.1.2.1 Modify Existing Infrastructure. The existing utilities where possible would be used (0^\20 to support Alternative 4 activities. The basic approach to establishing the infrastructure for this 21 alternative would be to use the existing road network within the complex and relocate water and 22 electrical service terminals outside the footprint of the Alternative 4 environmental cap. The 23 environmental cap for this alternative is larger than that of Alternative 6 and equal in size to the 24 Alternative 3 cap. 25 26 The existing road network surrounding the 221-U Facility would adequately accommodate 27 equipment during waste delivery operations, waste-hauling traffic, and traffic associated with 28 construction of the environmental cap. Additional spurs off paved roadways for heavy 29 equipment access and waste movement activities would be constructed, as required. 30 31 Immediately before demolition of 27I-U, water mains and sewer pipelines located within the 32 environmental cap footprint would be sealed at the outer edge of the environmental cap. 33 Temporary water lines would be installed, as required, for sanitary requirements, fire- 34 suppression systems, decontamination operations, and dust control. Main transformers for 35 electric power to the 221-U Facility would be relocated outside of the perimeter of the 36 environmental cap. Temporary 480-volt electrical lines and panels would be installed in the 37 building, as required, for lighting, ventilation, and equipment operations. The electrical service 38 would need to include power supply to a new air-handling unit on the roof of 221-U. 39 40 The existing main bridge crane would be recertified for use during equipment handling within 41 the canyon. At the same time, minor modifications and repairs would be made to the main crane, n 42 including repair of the heating and air conditioning systems. 43 Fina! Fea.tibility Siudyjoi the t:anyon Disposition Giitlativc (22l-U Facility) J L]n C ') Of) ^ 0-7
Appendix G - Detailed Description of Alternative 4: DoE(lu,-2001-11 ^ Entombment with Internal and External Waste Disposal Rev. I Drafi13 Redline/Strikeout 1 The final step modifying the 221-U Facility for this alternative would be replacement of its roof 2 covering (versus roof structure). To prevent precipitation from entering the building during 3 waste handling activities within the canyon, a new roof covering would be installed. 4 5 G.1.2.2 Establish Support Facilities. Alternative 4 would also require administrative offices, 6 change rooms, tool rooms, lunchroom, restrooms, and storage rooms. During the initial activities 7 such as equipment sizing, equipment placement in the process cells, and demolition of attached 8 structures, this support could be provided from the 271-U Building. The use would be practical 9 only during the initial stages of 221-U modifications. Although there is no need for close crane 10 access to 221-U, 271-U Building demolition would still occur early in this alternative. Removal 11 of this building would allow preparation of the electrical gallery for waste placement and access 12 for backfilling. The backfill would start on the northwest side of the 221 •U Facility as the 13 galleries are filled with waste. 14 15 Mobile office units would be brought to the site to provide support office space at that point. 16 These facilities would be located outside the construction area for the environmental cap. 17 A construction perimeter fence would be installed to control access into and out of the work 18 zone. A main change room for nonradioactive work would be located outside the exclusion 19 fence. Existing telephone and electrical lines would be used to support office and clerical 20 requirements. Existing Hanford Site fire protection and ambulance services would be adequate 21 for emergency response. 22 G.1.2.3 Establish Staging Areas. Personnel staging areas would be included in the space 23 requirement for the support facilities. This would include change rooms, meeting facilities, and 24 other construction activity support areas. Equipment storage, waste queues, decontamination 25 areas, survey tents, container storage, and other staging requirements would be included in the 26 layout of support requirements for Alternative 4. 27 28 G.1.3 Modify Facility 29 30 In preparation for the operational phase of this alternative, the 221-U Facility would require 31 modifications. The first step would be to prepare the facility by evaluating it for the intended use 32 and making modifications as necessary. A major part of this step would be preparing a new 33 building ventilation system and blocking the existing system. The existing equipment on the 34 ^ eaeyen-eper ' an n deck would be placed into the process cells, and both the cells and 35 pipe trench would be grouted. The railroad tunnel would be demolished to improve access to the 36 221-U Facility. The final modification step would be to address surface contamination with a 37 fixative application to prepare the canyon for the start of waste emplacement activities. 38 39 G.1.3.1 Prepare Facility for Use. The 221-U structure must resist loads with safety factors that 40 meet building codes (i.e.. American Concrete Institute, American Institute of Steel Construction) 41 for standard occupancy, but containment or serviceability requirements would be minimal. No (--)42 public access would be permitted; therefore, structural concerns would be for worker safety only. 43 Final Feasibility S1udy jor the Canyon Disposilion lniriarive (221-V Facility) J une 200l G-8
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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 (0-^, (^N 1 2 3 r• • .`•
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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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Appendix D- Slope Stability Analysi
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Appendix D - Slope Stability Analys
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^ Appendix D-- Slope Stability Anal
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Appendix E - Detailed Description o
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t^' Appendix E -Detailed Descriptio
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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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