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Appendix G - Detailed Description of Alternative 4: noFJRL-2ool-1i.<br />
Entombment with Internal and External Waste Disposal Rev. p Dra<br />
^diine/Strikcout<br />
ATTACHMENT Gl - FUNCTIONAL HIERARCHY<br />
1 G.23.2 Complete engineered fiil to dimensions ready for placement of<br />
2 engineered barrier and erosion protection.<br />
3 G.2.4 Place External Waste at 221-U<br />
4 G.2.4.1 Install double liner/leachate collection system<br />
5 G.2.4.2 Prepare infiltration barrier for exterior wall surface of 221-U which is<br />
6 above double liner<br />
7 0.2.4.3 Place external waste (soil remediation type waste) and compact in lifts<br />
8 G.2.4.4 Place interim cap over waste<br />
9<br />
10<br />
1 l G3 CLOSE THE COMPLEX<br />
12 G3.1 Construct Environmental Cap<br />
13 0.3.1.1 Incorporate interim cap material into engineered barrier<br />
14 G.3.1.2 Construct engineered barrier<br />
15 G.3.13 Place erosion protection layer on 3:1 fill slopes<br />
16 G.3.1.4 Stability Analysis of Environmental Cap<br />
17 G3.2 Revegetate site<br />
18 09.2.1 Prepare all disturbed areas and engineered barrier for seeding<br />
19 G.3.2.2 Apply approved seed mix and soil fixative<br />
20 G33 Pick up and clean the complex<br />
21 G.3.3.1 Remove excess equipment and materials<br />
22 G.3.3.2 Conduct final walkdown<br />
23 G3.4 Sustain Post Closure<br />
24 G.3.4.1 Establish institutional controls<br />
25 0.3.4.1.1 Establish access restrictions<br />
26 G.3.4.1.2 Establish deed restrictions<br />
27 G.3.4.1.3 Establish restrictions on use of the complex<br />
28 0.3.4.2 Maintain monitoring system<br />
29 0.3.4.2.1 Monitorgroundwatcr<br />
30 G.3.4.2.2 Monitor neutron probes below engineered barrier<br />
31 G.3.4.2.3 Periodically inspect barrier for erosion & settlement<br />
32<br />
Final Ftasibility StudyJor the Canyon Disposiliai iniriatlve (221-U Facility)<br />
^ itme 2003 G-33