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Appendix G - Detailed Description of Alternative 4: noFJRI.-2oo1-1I<br />
Entombment with Internal and External Waste Disposal Rev. I DraftJ3_<br />
Redline/Strikeout<br />
1 14. Waste received for placement would arrive at the site containerized in the cargo containers<br />
2 complete with an application of fixative to the container interior. Costs associated with<br />
3 placing waste into the containers and application of the fixative would be incurred by the<br />
4 waste generators and are not includcd in this alternative.<br />
5<br />
6 15. Backfill around the exterior of 221-U and waste inside the canyon would be placed evenly as<br />
7 the building is gradually filled with waste to prevent a large differential load on the canyon<br />
$ wall. Waste would be placed in lifts along the full length of 221-U to eliminate the potential<br />
9 of a large load difference between adjacent sections of the building.<br />
10<br />
11 16. Due to the uncertainties associated with both the volume of contaminated equipment<br />
12 currently located on the eenyettepeFatingdeekcanyon deck and inside of the process cells<br />
13 and the degree of equipment volume reduction that is achievable, it is assumed that only this<br />
14 contaminated equipment would be disposed in the 221-U process cells. It is further assumed<br />
15 that there is not sufficient space to accept additional waste from other sites for placement<br />
16 inside the process cells. The exception is cell 3, which is expected to have room for<br />
17 placement of waste in addition to that from the anvon dcck .<br />
18<br />
19 17. The existing 0.6-m (24-in.)-diameter cell drain header located beneath 221-U would be<br />
20 grouted to immobilize contamination in this pipe.<br />
("21<br />
22 18. A new ventilation system with replaceable high-efficiency particulate air (IEPA) filter banks<br />
23 would be installed on the northeast end of the 221-U roof. It would replace the existing<br />
24 ventilation tunnel and stack ventilation system. The new ventilation system would remain in<br />
25 operation until the canyon is filled with waste and grouted.<br />
26<br />
27 19. Internal void spaces associated with wastes disposed inside of 221-U would be filled with<br />
28 grout and pressure grouted. Where large voids are grouted (such as around the cargo<br />
29 containers and inside the cells), a low-cement-content grout would be used. This grout has a<br />
30 limited potential for heat buildup due to a low heat of hydration, yet would provide sufficient<br />
31 compressive strength for the intended service.<br />
32<br />
33 20. While sources for some materials required for construction of an environmental cap have not<br />
34 yet been identified, it is assumed that sufficient quantities of materials necessary for the clean<br />
35 fill and construction of the environmental cap are available locally.<br />
36<br />
37 21. A modified Resource Conservation and Recovery Act oj1976 (RCRA) Subtitle C engineered<br />
38 barrier would be constructed to protect the 221-U Facility and its contents from infiltration<br />
39 and intrusion.<br />
40<br />
41<br />
42 G.1 PREPARE EXISTING COMPLEX<br />
(^\43<br />
44 This function provides for the necessary physical modifications to the existing 221-U complex,<br />
45 including related programs, administrative and physical controls, safeguards, and infrastructure<br />
Final Feasi6ifiry Study jor the Canyon Disposition Initiative (221-U FaeiGty)<br />
ne1<br />
G-4