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PERMFILE118853
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PERMFILE118853
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Last modified
8/24/2016 10:14:33 PM
Creation date
11/25/2007 6:01:44 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2000087
IBM Index Class Name
Permit File
Doc Date
8/24/2000
Doc Name
MEMO STABILITY ANALYSIS FOR MILLIKEN PIT APPLICATION M-2000-087
From
DMG
To
TOM SCHREINER
Media Type
D
Archive
No
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• <br />STABILITY ANALYSIS <br />We performed a stability analysis for the proposed maximum mine slope section using the XSTABL <br />slope stability analysis program. The analysis was performed using the Bishop Method on <br />randomly generated slip circles. <br />The section analyzed was based on the boring data provided by Aggregate Industries and the mine <br />plan. The section assumes a mine depth of 6 a rpine slooe of 2:1 (horizontal to vertical), a <br />slurry wall located 20 feet behind the top oft a mine slope, dewatered conditions on the mine side <br />of the slurry wall, and saturated conditions on the backside of the slurry wall. The soil profile in the <br />cross-section consisted of tive feet of overburden clay overlying 37 feet of upper sand and gravel <br />over a two-foot thick "mud lens," overlying 16 feet of lower sand and gravel, on top 5 feet of fully <br />softened (weathered) claystone bedrock over peak strength claystone. No laboratory analyses were <br />performed on soils at the site. The soil strength parameters that were input were base on typical <br />values based on our experience, and are listed in the following table: <br />S <br />;~, 51 <br />~'-4 ~ <br /> Total Unit Saturated Unit Effective Effective <br />Material Weight (pd) Weight (pct) Cohesion friction Angle <br /> (pcfl (degrees) <br />Overburden Clay 6 114 126 200 2$ <br />Upper and LowerS~d ~ <br />l 130 137 0 35 <br />and Grave <br />/ <br />Mud Lens 114 126 200 26 <br />Fully Softened claystone ". 124 134 50 20 <br />Peak Strength claystone 124 134 500 28 <br />Slurry Wall 100 105 50 14 <br /> fC. •- <br /> ~ <br />J <br />~) ~ ~ r-d•.~•- r-~ <br /> ~~.~ <br />%~ r <br /> <br />•, e_ f ~• <br />~ ,, i!.> <br /> . <br />d~ <br />The factor of safety was 1.55, indicating the mine slopes should be stable. A copy of the stability <br />analysis cross-section is attached to this letter. <br />STRUCTURES WITHIN 200 FEET OF DISTURBED ARfAS <br />The proposed mine site is in an agricultural area with relatively few above-ground structures. <br />Structures within 200 feet of the proposed mine include State Highway 60; a short length of Union <br />Pacific Railroad tracks; a barn and farm buildings; an irrigation ditch; and several gas wells and their <br />associated separators, tank batteries, and pipelines. All known man-made structures and their <br />approximate distances from the proposed mine areas are listed below: <br />State Highway 60 located approximately 70 feet west of the proposed mine at its closest <br />point; <br />
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