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2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 ^20 .r ..1 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ("^13 44 Appendix C - Risk Modeling of an Engineered DoFARlr2001-11 Surface Barrier for the 221-U Facility Rev. ol raft Q Redlinc/Strikcout Cover-rclated inputs to RESRAD are predicated upon use of a Modified RCRA Subtitle C-type cover for the 221-U Facility or ERDF final cover, as mandated by the ERDF Record of Decision (EPA 1995). The Modified RCRA Subtitle C-typc cover includes a 0.6-m (2-ft)-thick compacted soil/bentonite admix with a geosynthetic membrane, a drainage layer, a vegetation layer, and a total thickness of 5 m(16.4 ft). The effect of the geosynthetic membrane to retard moisture penetration was ignored in the RESRAD evaluation. Two important cover modeling parameters are admix soil density and runoff coefficient. Runoff coefficient is related to drainage layer transmissivity, admix transmissivity, and annual inflow (precipitation). Values from the ERDF design analysis (Casbon 1995) for admixed soil density and the transmissivity (1 cmis) for 0.3 m(1 ft) of clean drainage gravel were used to model the cover. Drainage layer transmissivity is converted to a runoff coefficient value for different inflows as shown in Fi gure C- thc .-qhrrunoff coefficient increases as the transmissivity increases and as the precipitation increases. i u C- 1 shows coefficientc for 20.3 cm/yr and 127 cm/vr ( 8 in./vr and 50 in./yr1. The 26 cm/vr and 53.3 cm/yr (' linearrelationship. Because transmissivitv of 10'° cm/vr was assumed. Runoff coefficients approach 100% as liner transmissivity decreases to the transmissivity value of a clay liner of 10'8 cm/yr. Therefore, a single runoff coefficient of 0.98 was used for all precipitation levels. C.1.3 Results of Modeling a Disposal Facility with Clay Admix Liner The RESRAD runs for determination of preliminary remediation goals did not model the effects of the cover and predicted that only radionuclides with a distribution coefficient of less than one (carbon-14, technetium-99, and tritium (H-3]) had the potential to reach groundwater within ( 1,000 years. Uranium has a distribution coefficient.eRikreeereater than zem and was predicted not to reach groundwater within 1,000 years. With the clay admix cover included in the evaluation, RESRAD predicts that no radionuclides from the 221-U Facility or ERDF will reach groundwater within 1,000 years. ^As shown in Table C-2. this would hold true for current, double, and triple precipitation rates for the Hanford Site. C.2 REFERENCES 40 CFR 141, "National Primary Drinking Water Regulations;' Code of Federal Regulations, as amended. Final Feasibility Study for the Canyon Disposition Initiative (221-U Facility) June 100 C-3
n 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 r'%21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 Appendix C - Risk Modeling of an Engineered DOFJRL-2001-11 Surface Barrier for the 221-U Facility Rev. p t nn,ft L Redlinc/Strikcnut ANL,1993, Manual forlmplementing Residual Radioactive Material Guidelines Using RESRAD, Version 5.0, ANL/EAD/LD-2, September 1993, Environmental Assessment Division, Argonne National Laboratory, Argonne, Illinois. ANL, 2001, RESRADfor Windows, Version 6.1. Environmental Assessment Division, Argonne National Laboratory, Argonne, Illinois. BHI, 2001, ERDFCroundwater Modeling White Paper (CCN 088246 to A. R. Michael, Bechtel Hanford, Inc.. from Michael Casbon, April 4, 2001), Bechtel Hanford, Inc., Richland, Washington. Casbon, M. A., 1995, Design Analysis, Construction of W-296 Environmental Restoration Disposal Facility, BHI-00355, Rev. 00, Vol. 1, Bechtel Hanford, Inc., Richland, Washington. DOE, 1995, Benchmarking Analysis of Three Multimedia Models: RESRAD, MMSOILS, and MEPAS, DOE(ORO-2033, October 1995, U.S. Department of Energy and U.S. Environmental Protection Agency, Washington, D.C. DOE O 5400.5. Radiation Protection ofthe Public and the Environment, U.S. Department of Energy. Washington, D.C. DOE-R4 1992, Remedial Investigation Feasibility Study for tGe 1 t70-BC-1 Operable Unit, DOE/RLr90-07, Rev. 0, U.S. Department of Energy, Richland Operations Office, Richland, Washington. DOE-Rf., 2000, 200-CW-I Operable Unit Remedial Investigation Report, DOElRL2000-35, Rev. 0, U.S. Department of Energy, Richland Operations Office, Richland, Washington. Ecolo!rv. 2001. Model Toxios Control Act Clemrup Rerrdatinn. Chamer 173-340 WAC. Publication 94406. Amended Februar,yl2. 2001. Washinrton State Department of Ecolow. Ofvmpia. Washington. EPA.1995, Record of Decision: U.S. DOE Hanford Environmental Restoration Disposal Facility, flanford Site, Benton County, Washington, U.S, Environmental Protection Agency, Region 10, Seattle, Washington. EPA, 1997, Establishment of Cleanup Levels for CERCLA with Radioactive Contamination, OSWER No. 9200.4•18, U.S. Environmental Protection Agency, Washington, D.C. Pe yt on, R. L. and P. R. Schrocder. 1990. F,ttvironmetntd Enrineering, Vol. "Journal a Final Feasibility Study for the Canyon Disposition tnitiative (221-U Facility) J une 200'i C-4
Page 1 and 2: AR TARGET SHEET The following docum
Page 3 and 4: (^N r^ r Proposed Plan for the Cany
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Page 9 and 10: ^ (^N t^ the steHitFths+amedielaeti
Page 11 and 12: o"N DOF/RIr2001-29 Draft D Redline/
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Page 21 and 22: ! ' t^ Project Prepare the existing
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Page 25 and 26: ^ POINTS OF CONTA CP ^ U.S. Drnartm
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Page 29 and 30: noFIRL-2001-11 Rev. p 1 1)raft P ^
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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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(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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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 of
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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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(00^1 2 3 4 5 6 7 8 9 10 11 12 13 1
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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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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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^ 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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