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. .r• ^ .. ' Appendix G - Detailed Description of Alternative 4: DOEIRI.2001-11 ^ Entombment with Internal and External Waste Disposal Rev. t Draft_8 Redline/Strikeout 1 prior to the start of Alternative 4. The wells are 299-W 19-8, 299-W 19-55, and 299-W 19-98. 2 Their prior removal would be confirmed as part of Alternative 4. 3 4 G.1.4S Earthwork to Prepare Working Area Adjacent to 221-U. Following removal of 5 aboveground structures and associated buried piping, the area surrounding 221-U would be 6 leveled and compacted in preparation for placement of the engineered fill. The subgrade 7 compaction and fill placement are the first steps for construction of the environmental cap. 9 G.1.5 Manage Hazardous Materials 10 11 Dangerous waste, asbestos, polychlorinated biphenyls, and other hazardous materials would be 12 removed from all areas of the complex and managed in accordance with ARARs. All avaete 13 materialsw s would be sampled, tested, and designated as required by ARARs, and treated 14 prior to disposal. Products consisting of or containing hazardous materials would be used and 15 ^ managed in accordance with their respective Material Safety Data Sheets. Waste meterie{sWa.cte 16 would be treated as required. 17 18 A temporary waste accumulation laydown area would be established to facilitate shipment and 19 disposal activities. This area would conform to established requirements for the maintenance, 20 accountability, inventory, labeling, and transportation of waste to approved disposal facilities. ^21 22 23 C.2 OPERATE THE COMPLEX 24 25 Operation of the complex for Alternative 4 refets spccifically to waste placement and entombment 26 in the 221-U Facility. Waste would be emplaced in the three galleries and on the main fanyen 27 epeming n on d k. Engineered fill would be installed around the exterior of 221-U as 28 waste is placed inside it. As a final step of the operation function, waste would be placed around the 29 exterior of 221-U. 30 31 In the preceding functions, the area surrounding 221-U has been prepared to support construction 32 of the environmental cap, all equipment that would interfere with placement of containerized 33 waste has been placed in the process cells or removed, and exposed surfaces inside the canyon 34 have been decontaminated or a fixative applied. The roofing system on 221-U has also been 35 replaced to minimize the potential for precipitation entering the building during the operational 36 phase of this alternative. The steps to operate the complex are discussed below. 37 38 The total volume of waste placed inside and outside of the 221-U Building in Alternative 4 is 39 estimated as 63,600 ms (83,063 yd). The waste volume inside 221-U (13,500 ms [17,600 Ids]) 40 Includes 3,400 m3 (4,400 yd^) of legacy equipment placed inside the process cells,1,5tx1 m 41 (2,000 yd3) of waste inside containers in the three galleries, and 8,600 m3 (11,200 yd) of waste 42 ^ placed on the n k and craneway. An estimated 51,200 tnO ^ 43 (67,000 yd) of grout would be used inside 221-U in this alternative to surround the waste and 44 fill voids in the process cells, hot pipe trench, galleries, canyon deckicraneway, and the Final Feaiibifiry Srudyjor the Canyon Disposition lnitiarive (221-U Facility) June 2003 G-15
- •s. t .W ;. . Appendix G - Detailed Description of Alternative 4: DOF^RIr2001-11 ^ Entombment with Internal and External Waste Disposal Rev. I Draft [i Redlinc/Strikeout I building's ventilation tunnel. An estimated 50,100 m' (65,463 yd) (uncompacted volume) of 2 soil remediation-type waste would be placed outside of 221-U in Alternative 4. 3 G.2.1 Emplace Waste In 221-U Galleries 4 5 Waste placement would start with container placement in the galleries. The waste would be in 6 open-top cargo containers that would be placed on an individual steel frame with casters. Small 7 rails would be installed on the gallery walls to guide the containers on a one-way trip into the 8 galleries. Equipment and piping in the galleries that prevents container placement would be 9 removed. After the waste containers are in place, each gallery would be grouted to provide 10 support for the wastes and the environmental cap. 11 12 Waste would be placed first in the lowest (electrical) gallery. In preparation, the south end wall 13 of the gallery, located in the 276-U Solvent Recovery Facility, must be exposed. The concrete 14 slab adjacent to the end wall would be cleared to allow vehicle access to the lowest gallery. 15 A temporary structure would be erected so that containers could be prepared outside of the 16 galleries. The concrete masonry unit block end wall must be removed and enlarged for waste 17 container access. A new rollup door would be installed on this opening. The doorways from the 18 271-U Office into the galleries could be left open to provide emergency egress, but would 19 eventually be filled. A ventilation system for the galleries must remain functional during waste (^%0 placement and grouting. 21 22 G.2.1.I F511 Electrical Gallery with Contalnerized Waste. Waste would arrive at the south 23 end of the canyon by truck in cargo containers ( see assumptions for description) and would be 24 lifted onto dollies staged at the opcn gallery end. They would be pushed as far as possible into 25 the gallery with an electric forklift and then secured in place to prevent movement during 26 grouting. The total length of the electrical gallery is separated by the railroad tunnel in two 27 segments. The main segment of the electrical gallery on the south side of the railroad runnel is 28 225 m in length. This gallery segment could hold approximately 37 containers. A spacing of 29 6 m (20 ft) on center for the 5-m ( 16-ft) containers was assumed to allow for dolly length and 30 container placement. 31 32 There is a short segment of the electrical gallery on the north side of the rail tunnel. This gallery 33 segment is about 12 m(40 ft) long and could store, at most, one container. The best use of this 34 space would be to place loose material that is too long or tall to be placed in a containcr. 35 A possible use for this space is disposal of material from dcmolition of the 276-U Solvent 36 Storage Facility. After waste placement, this short segment would be closed off with forms and 37 grouted from the pipe gallery level. 38 39 G.2-1.2 Grout Electrical Gallery. To encase the waste and provide support for waste 40 containers to be placed in the pipe gallery above, the electrical gallery would be grouted. 41 Cement grout would be placed into the containers through a hole in the slab above and centered ("%42 on the container. The flowable grout to surround the containers would be placed after the 43 containers are partially filled with grout. Flowable cement grout could be obtained with a 44 strength of 14 kg/cm2 (2001b1in=). This could be pumped under low pressure, just sufficient to Final Feasibiliry Studyjor the Canyon Disposition lnitiotive (2I1-U Faciliryl un " 1 0-16
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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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fO'^, ^ 1 2 3 4 5 6 7 8 9 10 11 12
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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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f,^N Appendix E - Detailed Descript
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^ ^ t^ 2 DOEIRL-2001-11 Rev. H Ihaf
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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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I ,.,. , ... . DOFJRI.-2001-11 Appe
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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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^'. DoEIR1.-2001-11 Appendix I-Deco
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^ ("` ^ DOFJRI.2001-11 Rev. G I. Dr
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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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