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Appendix G -Detailed Description ofAlternative 4: DoFJRtr2oo1-1 i Entombment with Internal and External Waste Disposal Rev.1 Draft n Redlinc/Strikeout 1 canyon surface to reduce the dose rate and contamination risk to the lowest possible level. Water 2 jet, water blasting, or water-flushing activities would be more difficult if completed after the 3 process cell drain header and cells are grouted because all water would need to be collected and 4 taken to the 200 Area's Liquid Effluent Remediation Facility for treatment. If any surface 5 removal work is identified, carbon dioxide blasting or scarifying would be the preferred method 6 for its removal instead of water blasting or flushing. 7 8 G.13.6 Fix Contamination on 221-U Interior Surfaces. After the cover blocks are placed and 9 grouted on the process cells and hot pipe trench, the existing bridge eFanesg= would no longer 10 be needed. Use of the eFe-es= ranc for movement of the containerized waste would be a potential 11 source of contamination. 'Therefore, they would be parked at the north end of 221- U, their oil 12 would be drained, and the power source disconnected. 13 14 + It is assumed that surface contamination on the canyon walls, 4aesrcAq3on deck s, and ceiling can 15 be addressed with application of a fixative. This fixative would be applied after all equipment 16 removal (including the bridge crane) and grouting in the canyon is complete. It would provide 17 containment for loose surface contamination during containerized waste placement within the 18 ^ canyon. Prior to beginning container placement on the n on de k, the 19 fixative application would be inspected. 20 ^21 G.IA Modify External Area 22 23 The following modifications would be performed to support placement of waste inside 221-U. 24 Before waste placement begins within 221-U, the aboveground structures that are physically 25 attached to 221-U and those that are located within the footprint of the environmental cap must 26 be removed. In addition, prior remediation (by others) of waste sites within the footprint of the 27 environmental cap would be verified. 28 29 The Alternative 4 approach conservatively assumes that all demolition debris from the legacy 30 structures would be disposed at ERDF. During final design this assumption could be revisited to 31 determine if decontaminating and recycling steps could be economically included to support 32 DOE waste minimization goals. 33 34 G.1.4.1 Disposition or Aboveground Structures. The aboveground structures identified in 35 Assumption 2 at the beginning of this appendix would be demolished as part of Alternative 4. 36 37 G.1.4.1.1 Demolition or the 276-U Solvent Recovery Facility. The 276-U Solvent Recovery 38 Facility, attached to the southwest end of the 221-U Facility, is composed of walkways, tanks, 39 and associated piping set in an open-concrete basin. Decommissioning would involve removing 40 the tanks, walkways. and all aboveground piping. All pipe penetrations associated with this 41 structure would be cut, sealed, and capped. Drains would be sealed with concrete. Concrete 42 surfaces would be decontaminated,ifrequired,using selected off-the-shelfteehnologies. (ON3 44 The concrete slabs and wall would be demolished with conventional dcmolition equipment. 45 Demolition debris would be taken to ERDF for final disposal. An option during final design Finat Feasibility Sludy firr the Canyon Dispo.tilion lniriarive (21I-U Facility) Arne 1003 G-13
o"^, Appendix G - Detailed Description of Altt:rnative 4: DOFJRL-2001-11 ^ Entombment with Internal and External Waste Disposal Rev.1 Draft li Redline/Strikeout 1 would be to place some of the equipment either in cell 3 or into containers placed into the 2 galleries. 3 4 G.lA.1.2 Demolition of the 271-U O[fice Bullding. The 271-U Oftice Building would be 5 demolished in Alternative 4. The 271-U Office Building has a basement, three floors, and a 6 reinforced concrete slab roof. There is a concrete masonry perimeter wall supported on a 7 basement wall, with interior masonry walls within the building. The roof is a reinforced concrete 8 slab similar to the floors. The third floor is a chemical makeup area with floor slabs up to 03 m 9 (1 ft) thick that support chemical tanks. 10 11 Additional building features included in the demolition are a stack on the roof (296-U-10), an 12 elevator, a second floor vault, and mechanical equipment in the basement. Demolition would 13 use typical building demolition techniques. The resulting rubble would be left in place alongside 14 221-U and the area filled and compacted as part of the clean fill around the canyon. 15 16 G.1.4.1.3 Decontamination and Decommissioning (D&D) of Stairways on 221-U Building. 17 Eight stairwells on the northwest side of 221-U are light construction and would be demolished 18 using typical building demolition techniques. Ten stairwells on the southeast side of 221-U are 19 thick wall, lightly reinforced concrete construction. The heavy construction of these stairwells 20 would be factored into the demolition costs. Any contamination found in the stairwells on the (0-'\ 21 canyon's southeast side would be fixed in place prior to demolition. All stairwell demolition 22 waste would be disposed adjacent to 221-U where it would be protected from infiltration by the 23 environmental barrier. 24 25 C.1.4.1A D&D Other Aboveground Structures. All other aboveground structures identified 26 in Assumption 2 at the beginning of this appendix that are within the footprint of the 221-U 27 environmental cap would be decommissioned as part of Alternative 4 activities. 28 29 G.1A.2 D&D of Buried Piping. Buried piping not already addressed in the preparation of the 30 complex function would be ttrouted in place or removed prior to the placement of engineered Cill 31 around 221-U . based on the outcome of risk assessment work . In addition to the miscellaneous 32 piping to be removed, the exhaust ventilation tunnel would be removed. This tunnel is a 33 reinforced tunnel connecting the canyon air ventilation tunnel to the stack and filter. The tunnel 34 is approximately 60 m long and runs from the end of the ventilation tunnel in section 3 to the 35 fans. 36 37 G.1.4.3 Confirm Remediated Waste <strong>Site</strong>s Within Environmental Cap Footprint- 38 Altemative 4 includes covering 221-U with an environmental cap. It is assumed that the waste 39 sites located within the environmental cap, as identified in Assumption 4 at the beginning of this 40 appendix, would be remediated by other projects prior to the start of Alternative 4 and 41 construction of the environmental cap. All remediation wastes would be disposed at ERDF. 42 43 G.1AA Confirm Well Decommissioning. Three wells are located within the footprint of the 44 environmental cap. It Is assumed that these wells would be decommissioned by other projects Final Feasibility Studyfor the Canyon Disposition lnitietive (221-U Facility) )uno?003 G-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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i^ f 1 2 3 S 6 7 8 9 11 12 13 14 15
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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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^ ^ 1 2 DOFJRL-2001-11 Rev.A 1 Dra(
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. . .,.. Appendix C - Risk Modeling
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t^ Appendix C - Risk Modeling of an
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(_^% ^ ^ 11 Appendix C - Risk Model
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(0"% t^ DOFJRL-2001-1 l Rev. N 1 Dr
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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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• Appendix D-Slope Stability Anal
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^• r^, r^ 2 3 4 5 6 7 Appendix D-
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^ Appendix D-- Slope Stability Anal
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^ (00h^' ^ 2 DOFIRI^2001-I I Rev. J
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t^` ^ ^ 1 2 DOFJRL-2001-11 Rev. JDr
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Appendix E - Detailed Description o
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Appendix E- Detaiied Description of
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t^' Appendix E -Detailed Descriptio
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Appendix H - Detailed Description o
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Appendix H-Detailed Description of
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Appendix H - Detailed Description o
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f^ ^ DOFJRL-2001-I I Rev. N raft Rc
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f^ ^ 1 2 DOFlRI.-2001-11 Rev. pI af
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^ DOF/RL-2001-11 I Appendix I - Dec
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DOFJRI.-2001-11 I Appendix I- Decom
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^ DOFlRI.•2001-11 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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t^ ^ Appendix J-Applicable or Relev
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^ Appendia J- Applicable or Relevan
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