2016-08-01_PERMIT FILE - C1981010A ‎(7)‎

• Permit No: C1981010A
• IBM Index Class Name: Permit File
• Doc Date: 8/1/2016
• Section_Exhibit Name: 1.0 Introduction
• Media Type: D
• Archive: Yes

Drainages affected by road fills include Far East Buzzard, Coyote, No -Name, Johnson, West
Pyeatt, Middle Pyeatt, East Pyeatt, Grouse, Sage, Oak, and Flume.
1.4.1.3 Impoundment Regrading
Calculation of regrade times for existing and future impoundments is shown in Table A-7.
Impoundment volume calculations are shown in Table A-7.(1-2) of Appendix A. Many of the
impoundments were approved as permanent structures by the Division. As a result, they
will be left in place. Impoundments requiring reclamation include Far East Buzzard, Coyote,
Middle Pyeatt, Sage, West Horse, and Deal.
The earthen impoundments would be graded with dozers, filling back the areas from which
the material had been previously removed. Caterpillar D10R dozers equipped with a semi -u
blade were used to develop cost data and productivity. This regrading would establish the
approximate original contours in the affected areas.
1.4.2 Retopsoiling
After regrading, topsoil from permanent stockpiles would be placed on all disturbed areas,
except for such minor disturbances as light duty access roads, where topsoil was never
removed. Topsoil replacement costs are summarized in Table A-9. Productivity and cost
values are for Caterpillar 637G scrapers, and a Caterpillar 5130 excavator with Caterpillar
777C trucks. These equipment types, and particular models, were selected as a cost
efficient means of loading, transporting, and uniformly spreading the topsoil. TALPAC
software was used to determine scraper and truck/trackhoe production per hour. The
capacity used for each scraper load was 27 bank cubic yards, and truck payloads were 75
bank cubic yards. These values reflect actual load factors used by Trapper Mining Inc.
based on historical production data. The areas requiring topsoil replacement would include
all active, inactive, and abandoned pits, and their associated roadways, impoundments, and
the industrial complex area.
Map M10B illustrates topsoil removal and replacement activities for each year of the permit
term, including the worst case year of 2014. This map is the basis for pit disturbance areas.
The industrial complex area, and other topsoil replacement areas were calculated from mine
workings maps.
A topsoil replacement area for roadways was calculated for roadways lengths as shown on
Map M9 and roadway disturbance widths.
For each of the topsoil replacement areas, a typical spread point location was established
from which average haul distances and grades were determined based upon their locations
and the permanent stockpile locations. Table A-10 summarizes the results of each haul
route. TALPAC software was used to calculate production rates. The total amount of
topsoil required to replace all disturbance during worst case bond year 2014 is 3,175,600
cubic yards. Output from TALPAC is included in Appendix A.
Map M6, Bond Worst Case Year, 2014 shows the disturbed area, topsoil pile locations, the
location of final cuts, and regrade cross-section locations.
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