REP43039

• Permit No: M1992069
• IBM Index Class Name: Report
• Doc Date: 2/22/1993
• Doc Name: LETTER OF TRANSMITTAL
• From: TUTTEL APPLEGATE INC
• To: DMG
• Media Type: D
• Archive: No

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Introduction
This slope stability analysis is a result of concerns raised
regarding the integrity of embankments housing gas transmission
pipelines and the proximity of railroad tracks overhead utility
line's, and a County road near the 83rd Joint Venture proposed
gravel pit mines. Since the utlity lines are located on the north
side of the railroad tracks and the south side of the County road,
they are not specifically addressed here. No specific location of
slope failure was identified therefore, this analysis has taken a
general approach to determine a "worst case" condition.
Design Parameters
The embankment housing the gas pipeline between the two major
phases (along a north-south orientation) of mining was determined
to be the most critical section on the site. The bank on the north
side of the pit is very similar to the north-south embankment with
the exception of the reservoir on the backside. A preliminary
analysis of the north bank produced results similar to the north-
south embankment analysis.
For modelling purposes, a cross-
section of this embankment was
taken during the phase of mining
w}~en the eastern phases had been
mined out and the western phase
was being dewatered into the
(riow reservoir) eastern phase
(Fig. 1). Per the reclamation
p]_an overburden is to be
backfilled and sloped 3:1 on the
sides of the vacated pits.
A mineral evaluation of the
site, performed by Empire
Laboratories, Inc., provided the
subsurface materials of the
natural soils on the site. Shear
strength tests were not
performed on the soil samples,
but conservative estimates of
the soil properties were
recommended by Neil Sherrod,
Senior Engineering Geologist of
analysis.
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Figure 1 Critical Section
Empire Laboratories, Inc., for this
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