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2<br />

3<br />

4 5<br />

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

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