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f~' Appendix G - Detailed Description of Alternative 4: DOFiRI.-2001-11 ^ Entombment with Internal and External Waste Disposal Rev. l Draft_a RedlineJStrikeout 1 2 5. No surface contamination removal from interior surfaces of 221-U is included in Alternative 4. All concrete surfaces would receive applications of fixatives. 3 4 5 6. Removal, decontamination, and demolition operations for contaminated equipment being atereci inside of 221-U would be performed using conventional, proven technologies. 6 7 8 9 10 11 12 13 14 7. Following minor mechanical modifications and recertification, the existing main crane in the 221-U Facility would be functional and ready for use in Alternative 4 activities. Crane use would be limited to moving of equipment from the process cells to the eanyeneperet9rtg deEltc:ln,von dcck where the equipment would be reduced in size and volume, as necessary, and then placed back into the process cells. The main crane would also be used to move the equipment from the canyon deck during size and volume reduction and to place the equipment into the process cells. As part of these activities, the crane would be used for cover block movement. 15 16 17 18 S. All underground piping systems located beneath the environmental cap footprint for Alternative 4 would be gmuted in place or removed as part of the alternative . based on the outcome of ris assessment work . 9his moved waste would be disposed at ERDF. 19 20 ^ 9. The 221-U Canvon eck elevation is estimated at 221.5 m (726.5 ft). r21 22 23 24 25 26 10. The canyon interior (including the process cells, hot pipe trench, and associated ventilation tunnel) and the rail tunnel interior are considered to be contaminated. The galleries are considered to be uncontaminated except for some areas of the southeast wall that would require fixative application. 27 28 29 11. The 221-U Facility is located within the exclusive land-use boundary identified in the Final Hanford Comprehensive land-Use Plan Environmental Impact Statement (DOE 1999) and the associated "Hanford Comprehensive I.and-Use Plan Environmental Impact Statement 30 (HCP EIS), Hanford Site, Richland, Washington: Record of Decision (RODy' (64 Federal 31 Register 61615). This implies that the U.S. Department of Energy (DOE) would remain in 32 control of the 200 Areas and industrial-exclusive land use would be limited to waste 33 management activities. 34 35 12. Only remediation waste generated at the Hanford Site would be disposed in the facility. 36 Immobilized low-activity waste was considered but Is not included in the waste inventory for 37 disposal at 22 1 -U. 38 39 40 41 13. Waste containers would be open-top cargo containers. The containers would have the approximate dimensions of 5 in long by 2.4 m wide by 2.6 in high ( 16 ft long by 8 ft wide by 8.5 ft high). This size would allow container placement two abreast on the eanyen epefatieg 42 deekcanyon deck . Containers would be placed using special shielded forklifts designed to (0^143 44 limit operator exposure during container handling. Final Feasibility Study jor the Canyon Disposition bJtiative (221-U FaeiJiry) 7unc 20()3 0-3
Appendix G - Detailed Description of Alternative 4: noFJRI.-2oo1-1I Entombment with Internal and External Waste Disposal Rev. I DraftJ3_ Redline/Strikeout 1 14. Waste received for placement would arrive at the site containerized in the cargo containers 2 complete with an application of fixative to the container interior. Costs associated with 3 placing waste into the containers and application of the fixative would be incurred by the 4 waste generators and are not includcd in this alternative. 5 6 15. Backfill around the exterior of 221-U and waste inside the canyon would be placed evenly as 7 the building is gradually filled with waste to prevent a large differential load on the canyon $ wall. Waste would be placed in lifts along the full length of 221-U to eliminate the potential 9 of a large load difference between adjacent sections of the building. 10 11 16. Due to the uncertainties associated with both the volume of contaminated equipment 12 currently located on the eenyettepeFatingdeekcanyon deck and inside of the process cells 13 and the degree of equipment volume reduction that is achievable, it is assumed that only this 14 contaminated equipment would be disposed in the 221-U process cells. It is further assumed 15 that there is not sufficient space to accept additional waste from other sites for placement 16 inside the process cells. The exception is cell 3, which is expected to have room for 17 placement of waste in addition to that from the anvon dcck . 18 19 17. The existing 0.6-m (24-in.)-diameter cell drain header located beneath 221-U would be 20 grouted to immobilize contamination in this pipe. ("21 22 18. A new ventilation system with replaceable high-efficiency particulate air (IEPA) filter banks 23 would be installed on the northeast end of the 221-U roof. It would replace the existing 24 ventilation tunnel and stack ventilation system. The new ventilation system would remain in 25 operation until the canyon is filled with waste and grouted. 26 27 19. Internal void spaces associated with wastes disposed inside of 221-U would be filled with 28 grout and pressure grouted. Where large voids are grouted (such as around the cargo 29 containers and inside the cells), a low-cement-content grout would be used. This grout has a 30 limited potential for heat buildup due to a low heat of hydration, yet would provide sufficient 31 compressive strength for the intended service. 32 33 20. While sources for some materials required for construction of an environmental cap have not 34 yet been identified, it is assumed that sufficient quantities of materials necessary for the clean 35 fill and construction of the environmental cap are available locally. 36 37 21. A modified Resource Conservation and Recovery Act oj1976 (RCRA) Subtitle C engineered 38 barrier would be constructed to protect the 221-U Facility and its contents from infiltration 39 and intrusion. 40 41 42 G.1 PREPARE EXISTING COMPLEX (^\43 44 This function provides for the necessary physical modifications to the existing 221-U complex, 45 including related programs, administrative and physical controls, safeguards, and infrastructure Final Feasi6ifiry Study jor the Canyon Disposition Initiative (221-U FaeiGty) ne1 G-4
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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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. . .,.. 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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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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^ Appendix D-- Slope Stability Anal
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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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t^' Appendix E -Detailed Descriptio
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Appendix It - Detailed Description
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Appendix H - Detailed Description o
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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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