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Appendix D- Slope Stability Analysis for<br />
Environmental Cap<br />
Table D-1. Assumed Engineered Fiil,1'Vaste, and Subgrade Properties.<br />
DOFJR1^2001-11<br />
Rev.A l f)rart j_i<br />
Rcdlinc/Strikeout<br />
Moist Unit Drained Drained Angle of Undrained<br />
Material Weight, Cohesion, Internal Friction Cohesion, kg/mI<br />
Qg/m'(ib/ft') hglm'(Ib/ft') (degrees) t7bKt=)<br />
Engineered fill (uncontaminated. 1.220 (130) 0 40 0<br />
compacted)<br />
Compacted exterior waste fill 1,125 (130) 0 37 0<br />
(Alternative 4 only)<br />
Subgrade 1.060(113) 0 37 0<br />
Material<br />
Table D-2. Assumed Ceotechnicai Engineering Properties for<br />
Engineered Barrier Components<br />
Moist Unit<br />
kt: i ht,<br />
Drained<br />
Strength<br />
eD<br />
Undralned<br />
Strength<br />
^<br />
c<br />
(IhNt) (deg.) kg/ms<br />
(bJrl s)<br />
(deg.) kg/m3<br />
(Ib/ft ')<br />
Basis for Estimate<br />
Pea graveVsilt 985 30 0 30 0 Material gradation is 85% sandy silt.1596 pea<br />
mix (105) gravel by weight. Moisture-density relationships<br />
on McCrce Ranch material is basis for unit<br />
weight (S(celly et aa. 1994). No site-specific data<br />
for strength parameters are available. so estimate<br />
is based on material descriptions and<br />
professional judgement.<br />
Silt 985 30 0 30 0 Same material as above, but no pea gravel and<br />
(105) slightly greater compaction.<br />
Composite of 1,144 (122) 37 0 37 0 Values are typical for these types of materials.<br />
sand and<br />
gravel f Iters<br />
and drains<br />
Compacted 1.172 (125) 36 0 0 72 Native silty sand and gravel mixed with<br />
clay admixture (1700) bentonite. Unit weight and drained properties<br />
from Casbon (1995). Undrained from estimate<br />
for similar materials.<br />
Final Feasibility Study jortlu Canyon DUposltion lnitiative (221-U Facility)<br />
J une 100 ^ D-17