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DOE/RL-90-11, Rev. 2
05/99
I cement slurry) were removed as debris from the walls to a point 0.76 meter above the floor. The
2 decontamination and inspection to verify achievement of a'clean debris surface' were documented on a
3 WRRV (refer to Appendix 6A-5). The removed wall coverings and other decontamination debris were
4 collected, designated as low-level waste, and disposed at LLBG.
5
7 7.4.3 303-F Building
8 The 300 Area WATS portion of the 303-F Building included metal pumps P40 and 50, metal transfer
9 piping protruding above pipe trench grating in the building (including two in-line cartridge filters), and
10 the metal-lined catch basin.
11
12 Transfer piping, pumps, and cartridge filters were removed during closure as debris, designated as low-
13 level waste, and disposed at LLBG.
14
15 The catch basin housing the stainless steel liner is constructed of concrete covered with acid brick. The
16 acid brick was removed to achieve a clean debris surface for these areas. The acid brick removal activity
17 and the clean debris surface inspection are documented on a WRRV (refer to Appendix 6A-6). The acid
18 brick debris was collected, designated as low-level waste, and disposed at LLBG.
19
20 The surface of the metal catch basin liner and the lower 0.6 meter of the east and south coated concrete
21 block wall immediately adjacent to the catch basin were decontaminated of visible, white waste residues
22 by hand scrubbing to a'clean debris surface'. The decontamination and clean debris surface visual
23 acceptance were documented on a WRRV (refer to Appendix 6A-8). Decontamination solutions, rags,
24 etc., were collected, designated as low-level waste, and disposed at LLBG.
25
26
27 7.5 PHASE 3 CLOSURE ACTIVITIES
28 Phase 3 closure will include the activities necessary to clean close 300 Area WATS portions of the 334
29 and 311 Tank Farms, to complete clean closure activities for the 333 and 303-F Buildings by removing
30 300 Area WATS piping from these buildings, and to remove 300 Area WATS piping from the WATS
31 and U-Bearing Piping Trench. Phase 3 closure activities have begun in accordance with the Ecology-
32 approved DIP (HNF-2814) and tentatively are scheduled to be completed in September 1999.
33 Decontamination and clean debris'surface inspections will be documented on the appropriate
34 task-specific WRRV identified in the Phase 3 DIP.
35
36
37 7.5.1 333 Building
38 Phase 3 closure will complete clean closure activities for the 333 Building begun during Phase 2.
39 Phase 3 closure activities for the 333 Building will consist of removal and disposal of 300 Area WATS
40 PVC drain piping from 300 Area WATS tanks 7 and 11 and non-300 Area WATS tanks 5, 9,13, 15,19,
41 26, and 31 to the 334-A Building storage tanks. These drain lines are located in pipe trenches within the
42 333 Building and between the 333 and 334-A Buildings. The trench structure is a portion of the WATS
43 and U-Bearing Piping Trench that is outside the scope of 300 Area WATS closure.
44
45 Piping will be disconnected from the drain valves beneath these tanks and removed from the trench.
46 Trench grating will be removed to gain access to piping for removal and will be replaced. Piping debris
47 will be designated and managed as described in Section 7.2.2. Removal of this piping will be
48 documented in the field logbook. No VMV will be generated for this activity.
990525.1340 7-5