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Appendix G- Detailed Description of Alternative 4: DOEIRI.-2001-1l<br />

^ Entombment with Internal and Extertial Waste Disposal Rev. I Drrft B<br />

RedlindStrikeout<br />

2 • Limit access to the environmental cap<br />

3<br />

4 • Maintain the integrity and effectiveness of the final cover (engineered barrier), including<br />

5 making repairs to the barrier, as necessary, to correct the effects of settling, subsidence,<br />

6 erosion, or other events<br />

8 • Maintain and monitor the groundwater monitoring systems<br />

9<br />

10 • Prevent runon and runoff from eroding or otherwise damaging the final cover (engineered<br />

11 barrier)<br />

12<br />

13 • Protect and maintain surveyed benchmarks.<br />

14<br />

15 Post-closure care would consist mainly of periodic inspections to identify erosion or settling.<br />

16 Either of these items could lead to infiltration of the barrier. If settling is identified, the resultant<br />

17 depressions would be filled and reseeded. The post-closure cost estimate includes replacement<br />

18 of the engineered barrier after 500 years.<br />

19<br />

20 Monitoring of the barrier and the vadose zone or groundwater would be performed over the<br />

^21 1,000-year performance period to verify the effectiveness of the waste placement activities and<br />

22 containment provided by the engineered batrier. Periodic sampling of monitoring stations would<br />

23 be performed followed by comprehensive laboratory analyses.<br />

24<br />

25<br />

26 GA REFERENCES<br />

27<br />

28 10 CFR 835, "Occupational Radiation Protection," Code ojFederal Regulations, as amended.<br />

29<br />

30 64 FR 61615, 1999, "<strong>Hanford</strong> Comprehensive Land-Use Plan Environmental Impact Statement<br />

31 (HCP EIS), <strong>Hanford</strong> <strong>Site</strong>, Richland, Washington; Record of Decision (ROD)," Federal<br />

32 Register, Vol. 64, No. 218, pg. 61615 (November 12).<br />

33<br />

34 BIB, 1998, Environmental Restoration Disposal Facility Waste Acceptance Criteria,<br />

35 BHI-00139, Rev. 3, Bechtel <strong>Hanford</strong>, Inc., Richland, Washington.<br />

36<br />

37 BHI, 2001a, Canyon Disposition Initiative: Preliminary AIARA Evaluation for Final Feasibility<br />

38 Study Alternatives 1, 3, 4, and 6 (CCN 089828 to G. M. MacFarlan, Bechtel <strong>Hanford</strong>,<br />

39 Inc. from J. C. Wiles and It. C. Free, Jr., May 31), Bechtel <strong>Hanford</strong>, Inc., Richland,<br />

40 Washington.<br />

41<br />

42 BHI, 2001b, Supplemental Waste Acceptance Criteria for Bulk Shipments to the Environmental<br />

("*N43 Restoration Disposal Facility, 000oX-DC-W0001, Rev. 2, Bechtel <strong>Hanford</strong>, Inc.,<br />

44 Richland, Washington.<br />

Final Feasibility Smdy jor the Canyon Disposition initiatPve (221-U Facility)<br />

J une IOn^<br />

G-25

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