2015-09-30_PERMIT FILE - M1985112

• Permit No: M1985112
• IBM Index Class Name: PERMIT FILE
• Doc Date: 9/30/2015
• Doc Name: Application AM01
• From: Loloff Construction
• To: DRMS
• Type & Sequence: AM1
• Email Name: PSH
• Email Name: WHE
• Media Type: D
• Archive: No

Table 1 - Soil Properties
Description
Max dry
density
cf
Saturated
Density
c
Cohesion
(psf)
Internal
Friction
An le
Overburden
110
131
150
22
Sand and Gravel
110
125
0
35
Weathered
Bedrock
125
141
100
18
Stable Bedrock
125
141
2000
20
Slurry Wall
100
110
0
45
DESIGN ANALYSIS AND CRITERIA
The proposed mining slopes were analyzed using the XSTABL v5.105a computer
program. XSTABL was designed to analyze the slope stability of earth embankments
subjected to several critical situations that may occur during the life of the embankment.
For this project, four cases were identified as critical during the mining operation. Static
and pseudo -static conditions were analyzed in each case.
Pseudo -static peak acceleration factors were taken from USGS information for the
western United States. The 2% probability of exceedance in 50 years (the most
conservative) was used.
Surface loading equivalent to an HS 20 highway load was applied adjacent to each area
to simulate heavy equipment loading that could be present at that location for
maintenance or construction activities.
All mining side slopes will be 3H:1 V.
Case North — North Property Line (NORTH). The mining operation is adjacent
to a private property with a permanent structure near the north property line of
the site. The proposed setback for mining is 50 feet from the property line. The
mining depth was assumed to be 59 feet in this area based on bore log
information in the geotechnical report.
Case South — South Property Line (SOUTH). The mining operation is adjacent
to private property with several permanent structures near south property line of
the site. The mining depth was assumed to be 44 feet in this area based on bore
log information in the geotechnical report. The proposed mining setback was set
50 feet from the property line
Case East — Existing Balsam Avenue ROW (EAST). The mining operation is
bounded by Balsam Avenue on the east with a 60' ROW. The mining depth was
assumed to be 59 feet in this area based, on bore log information in the
Loloff Construction, Inc. - Loloff Pit
Slop
J&T Consulting, Inc. e Stability Analysis