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Appendix F - Detailed Description of Alternative 3: DoEIRt.2001-11 Entombment with Internal Waste Disposal Rev. et ra Redline/Strileout I As part of the grouting effort, a 0.75-m (2.5-ft)-thick layer of grout would be placed on top of the 2 filled containers. This layer would act as both shielding and a working surface for the next layer 3 of containers. Grout amendments, such as fly ash or zeolite clays, would be considered for the 4 grout to reduce potential for leaching of radioactive isotopes. In the final design, a reinforced 5 concrete stab could be installed as the top section of the grout layer. The concrete slab would 6 provide a smoother surface for operation of the forklifts during waste placement of the next 7 layer. The grout, or possibly reinforced concrete slab, would be designed for the wheel loads of 8 the forklift. 10 The next waste placement would be inside the craneway. An opening in the southwest end wall 11 would be cut to provide access to the craneway. Guide rails would be installed and cargo 12 containers delivered into the craneway similar to waste placement in the galleries. 13 Approximately 39 containers could be placed in the craneway. The containers would be grouted 14 inside and out as was done in the galleries. 15 16 After placing, grouting, and pouring the topping grout or concrete layer on the third layer of 17 cargo containers, the height from the grout layer to the underside of the canyon roof would be 18 approximately 2 in. This would be too short to allow placement of cargo containers. Rather than 19 fill this large void with grout, placement of waste-filled burial boxes (1.2 m by 1.2 m by 2.4 m r,20 long [4 ft by 4 ft by 8 ft]) would be performed. For this final FS, it is assumed that 960 boxes of (.> 1 this size could be placed into a fourth and final layer of waste within the canyon. With tighter 22 packing, the number of boxes placed could be increased to 1,500. Void spaces on the interior of 23 the boxes would be filled with grout prior to placement. As a final step in placement of waste 24 inside the canyon, holes would be drilled through the canyon roof. Flowable grout would be 25 delivered into the canyon through these holes to fill around the boxes. Pressure grouting would 26 be used to fill voids not reached by previous grouting. 27 28 Upon completion of waste placement within 221-U, available space within the facility would be 29 filled with waste and/or grout. The containment provided by the grouting the waste inside 30 openings in the canyon would eliminate a111arge voids. These steps would stabilize 221-U and 31 ready it for placement of the environmental cap. 32 33 F.2.2.3 Install Engineered Fill. As the canyon is filled with waste, engineered fill would be 34 compacted in lifts around the exterior of 221-U. The engineered fill elevation would be 35 maintained within a few meters of the same level as the grouted wastes within 221-U. This 36 would prevent an excessive load across the canyon walls, including the end walls. The 37 engineered fill would also provide an access ramp to the south end of 221-U for container 38 delivery. 39 40 The engineered fill would be clean, compacted granular material, which would be placed in lifts. 41 Its source is assumed to be a <strong>Hanford</strong> <strong>Site</strong> borrow pit within 24 km (15 mi) of the 221-U Facility. 42 The actual source location has not been identified. The volume of engineered fill for ^33 Alternative 3 is approximately 1,169,700 m3 (1,529,869 yd'). The extent of the engineered fill 44 and environmental cap is shown in Figure F-1. 45 Final Feasibility Stndy/6rthe Canyon Di.ryrosltion Inftrative (221 •U Facility) n,e 200-1 F- 19
Appendix F - Detailed Description of Alternative 3: DOFAt1.20o1-1 t I Entombment with Internal Waste Disposal Rev.A ran ^ Rcdline/Sirikenut 1 The fill would be compacted to a density in the range of 95% to 98% relative compaction where 2 relative compaction is determined by standard proctor (ASTM D698). Final design of the 3 engineered fill would determine the compaction requirements and the material specifications. 4 5 6 F3 CLOSE THE COMPLEX 7 8 This function consists of completing construction of the environmental cap over 221-U and 9 demolition debris that was placed immediately adjacent to it. It would also involve restoring the 10 disturbed sites (access roads and equipment staging areas) to a grade consistent with the natural 11 surface topography. Closure of the complex for Alternative 3 would also require institutional 12 controls and maintenance of a monitoring system. Institutional controls could consist of both 13 physical and legal barriers to prevent access to contaminants. A closeout report would be 14 prepared for regulatory agency approval. 15 16 F3.1 Construct Environmental Cap 17 18 The environmental cap for Alternative 3 consists of three parts: engineered fill, engineered 19 barrier, and erosion protection (see Figure F-2). As discussed above, the engineered fill would 20 be placed during the operational function concurrent with waste placement inside of 221-U. ^21 When operational activities are complete, the engineered barrier and the erosion protection layer 22 would be constructed. This section discusses the completion of the environmental cap and 23 provides the results of analyses performed on stability of environmental cap. 1'he footprint of the 24 environmental can may be slightly modified to mnvidc containment for nearby CERCLA 25 remediation sites. The specific l a3mut wifl be nrovided in the rcmcdial desien document. 26 27 F3.1.1 Construct Engineered Barrier. The engineered barrier would be designed to prevent 28 unintentional human and biotic intrusion, minimize potential human and biotic exposures, and 29 control potential contaminant migration by preventing water infiltration into the waste 30 fnaterielswaste (221-U and demolition debris). The barrier thickness would be 5 m minimum. 31 which meets the requirement for protection against inadvertent intruders. 32 33 The barrier would be a modified RCRA Subtitle C-compliant barrier design to providc protection 34 against water infiltration and biotic intrusion for 500 years. The barrier would be vegetated to 35 control soil erosion and promote moisture evapotranspiration . A moisture measurine system or a 36 detection method to monitor for contaminalion movement 37 mav be installed- ui d in the barrier to monitor soil moisture and 38 verify that water is not infiltrating through the barrier into the waste. For the purposes of this 39 final FS, it is assumed that the engineered barrier would be replaced one time at the end of its 40 500-year design life. The result is that 221-U would have containment for at least 1,000 years. 41 42 The barrier consists of a loosely placed silt/pea gravel layer, which is a storage medium for soil /0^'43 moisture. It supports evapotranspiration and vegetation growth. This layer is underlain by a 44 compacted layer of silt. The compacted silt greatly reduces hydraulic conductivity and therefore Final Feasibility Studyfoi Nrt Canyon DisposUion lnh/ative (22/-U Facility) unc I l F-20
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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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^ ^ 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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Appendix G- Detailed Description of
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^• ^ Appendix G - Detailed Descri
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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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(^\ Appendix H - Detailed Descripti
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Appendix N- Detailed Description of
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Appendix It - Detailed Description
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(^N 5 6 7 8 9 to 11 12 13 14 15 16
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^N i ' (0-1% C Appendix H- Detailed
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Appendix H-Detailed Description of
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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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^ 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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