2010-11-12_PERMIT FILE - C1981010A ‎(3)‎

• Permit No: C1981010A
• IBM Index Class Name: Permit File
• Doc Date: 11/12/2010
• Section_Exhibit Name: 1.0 Introduction
• Media Type: D
• Archive: Yes

• 1.4.1.3 impoundment Regradina
Calculation of regrade times for existing and future impoundments is shown in Table 1.4-
6. Impoundment volume calculations are shown in Table A -3 of Appendix A. Many of
the impoundments were assumed to be permanent structures. As a result, they were
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 Retopsoilina
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 1.4-6, while Table
1.4 -9 summarizes re- topsoil quantities and time. Productivity and cost values were
those of Caterpillar 637G scrapers. This equipment type, and particular model, was
selected as a cost efficient means of loading, transporting, and uniformly spreading the
topsoil. TALPAC software was used to determine scraper production per hour. The
• capacity used for each scraper load was 24 bank cubic yards. As a result, a 16% swell
is implied since the actual average capacity for a CAT 637G is 29 loose cubic yards (24
CY struck capacity, 34 CY heaped capacity).
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 2012. 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 1.4 -9 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 2012 is 3,274,300 cubic yards. Output from TALPAC is included in Appendix A.
Map M6, Bond Worst Case Year, 2012 shows the disturbed area, topsoil pile locations,
the location of final cuts, and regrade cross - section locations.
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Revision. Pe- (,-
1 -41 Approved: -- -