2024-02-02_REVISION - M1982121 ‎(6)‎

• Permit No: M1982121
• IBM Index Class Name: Revision
• Doc Date: 2/2/2024
• Doc Name: Adequacy Review Response
• From: RMR Aggregates, Inc
• To: DRMS
• Type & Sequence: TR6
• Email Name: ACY
• Media Type: D
• Archive: No

KILDUFF RMR Aggregates, Inc.
U N Q E R 3 R G U V E Rock Failure Analyses and Stabilization Report
ENGINEERING. NC_ Mid Continent Limestone Quarry
considered and has been effectively used locally. However, the concrete bollard would require either
pumping concrete from the base or gravity feed from above. Neither are logistically realistic for the
as-needed local stabilization approach.The 6-inch hole could only be reduced in diameter if the
number of strands was reduced, requiring much longer bond lengths per strand, much longer strands
and therefore a much longer drill hole.The longer drill hole would require a much larger drill rig.
Due to the 6-inch hole diameter and depths required, a berm is needed to resist the upper and/or
lower limestone beds from failing and to be used as a work bench to install the required anchors.
Table 7 below provides details of the necessary anchorage, hole diameter and lengths.
Table 7a. Summary of Required Anchor Stabilization 1,3
Upper& Lower Vertical Horizontal Hole
Limestone Anchorage Spacing Spacing Diameter
Height (ft) (ft) (ft) (in)
10-15 8 strand 10 1 10 6
5-10 6 strand - 10 6
0-5 4 strand - 30 6
Table 71b.Summary of Required Anchor Stabilization 1,3
Upper& Lower Bond Free Tail Total Lock off
Limestone Length Length Length length Load
Height(ft) (ft) (ft)2 (ft) (ft) (kips)
10-15 1 18 1 15 1 2 1 35 1 345
5-10 13 15 2 30 250
0-5 8 15 2 25 185
Notes:
1.Lengths shown are the minimum lengths required.
2. Minimum free length per PTI is 15 feet.
3. Data presented is a preliminary design. Final design of the anchorage system will need
to be performed if required on site.
In order to achieve a higher factor of safety, K U E recommends horizontal drains to be installed
through the joint of the upper and lower limestone if active support is required onsite.
1011MITATIONS
This report has been prepared for RMRA far specific application to the Mid Continent Limestone
Quarry project as understood at this time, in accordance with generally accepted geotechnicaI
engineering practices common to the local area. No other warranty, express or implied, is made. In
the event that changes in the nature, design, or location of the planned construction are made,the
conclusions and recommendations contained in this report should not be considered valid, unless the
changes are reviewed by KUE and the conclusions of this report are modified or verified in writing.
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