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Appendix H - Detailed Description of Alternative 6: DOEIltl:2001-11 Close in Place - Collapsed Structure Rev. le Draft e tLedlinelStri •eout 1 Before leaving the complex, the demolition contractor would clear the site of all equipment and 2 3 materials. 4 111.3,4 Sustain Post-Closure 5 6 This alternative would require institutional controls and maintenance of a monitoring system. 7 8 Institutional controls could consist of both physical and legal barriers to prevent access to contaminants. In addition, certain activities would need to be prohibited so that the groundwater 9 and Columbia River water quality are protected. Post-closure care would consist of periodic 10 11 inspections and maintenance to verify the success of the revegetation effort. 12 113.4.1 Establish Institutional Controls. Specific institutional controls associated with this 13 alternative would be developed as the remedy is further defined in the remedial design report and 14 implemented through an update to the <strong>Site</strong>wide Institutional Controls Plan for <strong>Hanford</strong> CERCIlI 15 Response Actions (DOE-RL 2002). Generally, these activities would include physical and legal 16 methods of controlling land use. Physical methods of controlling access to waste sites would 17 include signs, entry control, excavation permits, artificial or natural barriers, and active 18 surveillance. Physical access controls would be designed to preclude unintentional trespassing 19 and minimize wildlife access. Physical restrictions would be effective in protecting human 20 health by reducing the potential for contact with contaminated media and avoiding adverse (0*^121 environmental, worker safety, and community safety impacts that arise from the potential release 22 of contaminants. They would require ongoing monitoring and maintenance. Public notices and 23 community relation efforts would supplement site surveillance efforts. The DOE, or subsequent 24 land managers, could enforce land-use restrictions as long as risks were above unrestricted land- 25 use levels. The DOE would continue to use fencing, excavation permits, and the badging 26 program to control access to the area for as long as it maintains control over the land. Signs 27 28 would be maintained prohibiting public access. 29 Legal restrictions would include both administrative and real-property actions intended to reduce 30 or prevent future human exposure to contaminants remaining on site by restricting the use of the 31 32 33 34 land, including groundwater use for drinking water or irrigation. Land-use restrictions and controls on real-property development are effective in providing a degree of human health protection by minimizing the potential for contact with contaminated media. Land-use restrictions will be put in place, as necessary, until such time as the federal government ceases 35 36 37 ownership of the property. The DOE, or subsequent land managers, would enforce land-use restrictions as long as risks were above acceptable levels. 38 Groundwater-use restrictions would be required so that groundwater is not used as a drinking 39 water source as long as contaminant concentrations are above federal and state drinking water 40 41 ^ standards and WAC 173-340 #4T6,4 B groundwater protection standards. Irrigation would also need to be restricted on the footprint of the environmental cap. Well drilling, except for the 42 purposes of monitoring, research, or other uses authorized by the Tri-Parties, would be (00N•43 44 prohibited untii groundwater cleanup levels comply with these drinking water standards. Final Feasibility Study for the Canyon Disposition Initiative (221 •U Facility) „ 100 .1 11-21
^. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ^21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ('^43 Appendix H-- Detailed Description of Alternative 6: DOEIRL-2001-11 Close in Place - Collapsed Structure Rev. 1o nratl B 8s'dt IIIaLSiulp-cw H3.4.2 Maintaln Monitoring System. Alooisture measuring system or a detection method to Long-term site-specific monitoring requirements for Alternative 6 would not be determined until post-ROD activities (e.g., during final design in preparation of the remedial design report/remedial action work plan). It is expected that long-term monitoring would occur over the 1,000-year performance period and consist of either groundwater monitoring or vadose zone monitoring, but it is not expected that both monitoring efforts would be required at the 221-U Facility. The specific monitoring system design and its requirements would be established as part of the operations and maintenance plan for the 200 Area-wide groundwater operable unit remediation activities associated with the 200-UP-I Operable Unit. Post-closure care would comply with the following functions as defined in Washington Adminisrrative Code 173-303-665(6). The functions were selected as being representative of the post-closure requirements of other applicable regulations: • Limit access to the environmental cap • Maintain the integrity and effectiveness of the final cover (engineered batrier), including making repairs to the barrier, as necessary, to correct the effects of settling, subsidence, erosion, or other events • Maintain and monitor the groundwater monitoring systems • Prevent nmon and runoff from eroding or otherwise damaging the final cover (engineered barrier) • Protect and maintain surveyed benchmarks. Post-closure care would consist mainly of periodic inspections to idontify erosion or settling. Either of these items could lead to infiltration of the barrier. If settling Is identified, the resultant depressions would be filled and reseeded. The post-closure cost estimate includes replacement of the engineered barrier after 500 years. Monitoring of the barrier and the vadose zone or groundwater would be performed over the 1,000-year performance period to verify the effectiveness of the Final Feasibifiry Study jor the Canyon Disposition lnidative (221•U FacUiry) iues =00 11-22
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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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f,^N Appendix E - Detailed Descript
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(0^s 1,^N Appendix E - Detailed Des
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^ ^ t^ 2 DOEIRL-2001-11 Rev. H Ihaf
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Appendix F - Detailed Description o
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Appendix F -Detailed Description of
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Appendix T- Detailed Description of
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Appendix F -Detailed Description of
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(O^N Appendix F - Detailed Descript
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Appendix E- Detailed Description of
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..^•. , Appendix F- Detailed Desc
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(^, Appendix F - Detailed Descripti
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(^N f ` Appendix F - Detailed Descr
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Appendix F-Detailerl Description of
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^`} Appendix F - Detailed Descripti
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^ (10^' (^N DOF/RL-2001-11 Rev. AjD
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^N r^ 1 n DOF/RLr2061-1 l ' Rev. I
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1 ^ (^N ^ DoFJRL-M-t t ^ Rev. I Dnf
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Appendix G -Detailed Description of
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Appendix G - Detailed Description o
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Appendix G - Detailed Description o
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Page 167 and 168: t^N (M"N Final Feasibifity Stady ja
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