GENERAL47069

• Permit No: C1980005
• IBM Index Class Name: General Documents
• Doc Date: 12/31/1986
• Doc Name: PROPOSED DECISION AND FINDINGS OF COMPLIANCE FOR RN1
• Permit Index Doc Type: FINDINGS
• Media Type: D
• Archive: No

XX. Roads - Rules 2.03 and 4.03.
A complete discussion of roads is found in Volume II, Tab 12 of the permit
renewal application and Volume VI, Tab 12 of the original permit application,
with references to associated maps and calculations.
The Seneca II Mine site will eventually contain about 16 miles of roads as the
mine expands into unmined areas. The design of haul roads has been based upon
the anticipated volume of traffic, weight and speed of the vehicles using them.
All culverts were designed to pass the 10 year, 24 hour design flow at
acceptable headwater conditions. Erosion control treatments at the outlet and
inlet free ends of culverts will be used and, as described, are acceptable
methods. All roadside ditches have been designed to safely pass design flows.
Peabody Coal Company has proposed to use alternate culvert spacing
specifications as per Rule 4.03.2(4)(c)(v). Peabody Coal Company contends,
and the Division concurs, that this practice will limit erosion at the mine
site. The Division finds that the design presented by Peabody Coal Company
will more effectively control and minimize erosion. Therefore, the Division
approves this variance.
A discussion pertaining to the 110 foot fill embankment on the main haul road
may be found in the original findings document (1981). Due to stability
concerns, annual certifications of this structure were required. As no
information has been submitted to the Division to warrant eliminating the
stipulation, the following stipulation remains in effect.
STIPULATION N0. 5
THE 110 FOOT FILL EMBANKMENT ON THE MAIN HAUL ROAD MUST BE INSPECTED ANNUALLY,
OR WITHIN 10 DAYS FOLLOWING ANY STORM WHOSE BACKWATER ELEVATION EXCEEDS THE
ELEVATION OF 6941.1 FEET ABOVE SEA LEVEL (10-YEAR, 24-HOUR MAXIMUM STORM
EVENT'S PROJECTED BACKWATER ELEVATION) BY A QUALIFIED GEOTECHNICAL ENGINEER OR
ENGINEERING GEOLOGIST. A LETTER OF CERTIFICATION CONTAINING THE RESULTS MUST
BE SUBMITTED TO THE DIVISION WITHIN 2 WEEKS FOLLOWING THE INSPECTIONS.
With the continued acceptance of the above stipulation, the operation is in
compliance with the requirements of this section.
XXI. Bondin -Rule 2.05.4(2)(b), Rule 3
Information pertaining to performance bonding and reclamation cost estimates
for the Seneca II Mine is presented in Volume II, Tab 13, Post-Mining Land
Use Plan, pages 13-39 to 13-63 of the permit renewal application. Spoil
volume and disturbed area acreage calculations are presented in Attachment
13-1 of Volume 2 of the permit renewal application.
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