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Appendix G - Detailed Description of Alternative 4: DOEIRI.2001-11
^ Entombment with Internal and External Waste Disposal Rev. t Draft_8
Redline/Strikeout
1 prior to the start of Alternative 4. The wells are 299-W 19-8, 299-W 19-55, and 299-W 19-98.
2 Their prior removal would be confirmed as part of Alternative 4.
3
4 G.1.4S Earthwork to Prepare Working Area Adjacent to 221-U. Following removal of
5 aboveground structures and associated buried piping, the area surrounding 221-U would be
6 leveled and compacted in preparation for placement of the engineered fill. The subgrade
7 compaction and fill placement are the first steps for construction of the environmental cap.
9 G.1.5 Manage Hazardous Materials
10
11 Dangerous waste, asbestos, polychlorinated biphenyls, and other hazardous materials would be
12 removed from all areas of the complex and managed in accordance with ARARs. All avaete
13 materialsw s would be sampled, tested, and designated as required by ARARs, and treated
14 prior to disposal. Products consisting of or containing hazardous materials would be used and
15 ^ managed in accordance with their respective Material Safety Data Sheets. Waste meterie{sWa.cte
16 would be treated as required.
17
18 A temporary waste accumulation laydown area would be established to facilitate shipment and
19 disposal activities. This area would conform to established requirements for the maintenance,
20 accountability, inventory, labeling, and transportation of waste to approved disposal facilities.
^21
22
23 C.2 OPERATE THE COMPLEX
24
25 Operation of the complex for Alternative 4 refets spccifically to waste placement and entombment
26 in the 221-U Facility. Waste would be emplaced in the three galleries and on the main fanyen
27 epeming n on d k. Engineered fill would be installed around the exterior of 221-U as
28 waste is placed inside it. As a final step of the operation function, waste would be placed around the
29 exterior of 221-U.
30
31 In the preceding functions, the area surrounding 221-U has been prepared to support construction
32 of the environmental cap, all equipment that would interfere with placement of containerized
33 waste has been placed in the process cells or removed, and exposed surfaces inside the canyon
34 have been decontaminated or a fixative applied. The roofing system on 221-U has also been
35 replaced to minimize the potential for precipitation entering the building during the operational
36 phase of this alternative. The steps to operate the complex are discussed below.
37
38 The total volume of waste placed inside and outside of the 221-U Building in Alternative 4 is
39 estimated as 63,600 ms (83,063 yd). The waste volume inside 221-U (13,500 ms [17,600 Ids])
40 Includes 3,400 m3 (4,400 yd^) of legacy equipment placed inside the process cells,1,5tx1 m
41 (2,000 yd3) of waste inside containers in the three galleries, and 8,600 m3 (11,200 yd) of waste
42 ^ placed on the n k and craneway. An estimated 51,200 tnO
^ 43 (67,000 yd) of grout would be used inside 221-U in this alternative to surround the waste and
44 fill voids in the process cells, hot pipe trench, galleries, canyon deckicraneway, and the
Final Feaiibifiry Srudyjor the Canyon Disposition lnitiarive (221-U Facility)
June 2003 G-15