2013-07-26_REVISION - M2008078 ‎(4)‎

• Permit No: M2008078
• IBM Index Class Name: REVISION
• Doc Date: 7/26/2013
• Doc Name: TR Submittal
• From: GP Aggregates, LLC
• To: DRMS
• Type & Sequence: TR2
• Media Type: D
• Archive: No

A summary of the material properties used in our analysis is shown in Table 3.
TABLE 3. Material Properties Used
Hvdraulic Conductivity
ANALYSIS RESULTS
Friction
Cohesion
Unit
C
Weight
z c t
26
0
30
0
128E-09 2.83E-04
0.1
125
500
0 E - 0 6 3 . 2SE-08 2,83E-03
0,1
125
0
F
111" -02 3.28E-04 28.35
0.1
135
'V� e i t h r e a
3.53E-05 3.13E-06 2.70E-01
. .........
0.1
.... .. . . ......
130
2� :* t - 10 2.83E-05
0.01
130
',r�OE-06 3,28E-08 2.83E-03
1
115
1 ,)CE-07 i 3.28E-09 2.83E-04
I
115
ANALYSIS RESULTS
We performed seepage and slope stability analyses using SEEP/W and SLOPE/W software
published by Geo-Slope International and contained in the Geostudio 2007 suite of applications
(Version 7.20, Build 5033).
STEADY STATE SEEPAGE ANALYSIS
For the steady state seepage analysis of the reservoir when empty, we analyzed the cross section
we created at Station 31+52 (the thickest gravel layer encountered). We first evaluated a slurry
wall with a hydraulic conductivity lxlO-' cm/sec. The Seep/W analysis provided the total flux (i.e.,
flow) in a one-foot length of wall of 5.5804 fe/day. The Seep/W analysis results for the slurry wall
with a hydraulic conductivity of 1x10"' cm/sec are shown in Figure J. We multiplied the flux by the
total wall length (around the perimeter) to obtain an estimate of the total flow through the wall.
The total wall length was taken as the average of the perimeter of the pit at the top of the 3:1
slope and the perimeter of the base of the reservoir (4460 feet). For this case, we estimated total
inflow through the bottom and the perimeter of 24,888 ft3/day. The State Engineer's total
'A
maximum allowable inflow (bottom and perimeter) is 28,767 ft/day. Based on the material
properties used, for the section analyzed with the thickest gravel layer, the factor of safety is about
1.2 - between the actual calculated inflow and the total maximum allowable inflow.
Friction
Cohesion
Angle
C
100
26
0
30
0
3S
50
w.
500
0
30
0
33
We performed seepage and slope stability analyses using SEEP/W and SLOPE/W software
published by Geo-Slope International and contained in the Geostudio 2007 suite of applications
(Version 7.20, Build 5033).
STEADY STATE SEEPAGE ANALYSIS
For the steady state seepage analysis of the reservoir when empty, we analyzed the cross section
we created at Station 31+52 (the thickest gravel layer encountered). We first evaluated a slurry
wall with a hydraulic conductivity lxlO-' cm/sec. The Seep/W analysis provided the total flux (i.e.,
flow) in a one-foot length of wall of 5.5804 fe/day. The Seep/W analysis results for the slurry wall
with a hydraulic conductivity of 1x10"' cm/sec are shown in Figure J. We multiplied the flux by the
total wall length (around the perimeter) to obtain an estimate of the total flow through the wall.
The total wall length was taken as the average of the perimeter of the pit at the top of the 3:1
slope and the perimeter of the base of the reservoir (4460 feet). For this case, we estimated total
inflow through the bottom and the perimeter of 24,888 ft3/day. The State Engineer's total
'A
maximum allowable inflow (bottom and perimeter) is 28,767 ft/day. Based on the material
properties used, for the section analyzed with the thickest gravel layer, the factor of safety is about
1.2 - between the actual calculated inflow and the total maximum allowable inflow.