PERMFILE137965

• Permit No: C1981029
• IBM Index Class Name: Permit File
• Doc Date: 7/20/1993
• Doc Name: AS FUNCTIONING EXPLOSIVE STORAGE AREA SEDIMENTATION POND
• Section_Exhibit Name: MAP 11A
• Media Type: M
• Archive: No

Level reference line
for X section C -C' —
C
D
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06 B
I
1
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2.3
D'
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3 0
GD tP
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:w -
N
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45 A SOO'Na'I glade 213:45 %
4 ; 4.T
�met9encY i
- -_Q GOAD,
oppQs
The area inbetween the + 0.5 foot thick flagstone
(sandstone) riprap units is filled with + 0.1 foot gravel
103.0
A'
/ -
1 Approximate waterline location�Z
o Ir - --- -=---- --T - -- - - - - -- `\
D
r
The low point on the south embankment is 2.1 feet above the excavated spillway base at cross- section D-
D'. Riprap 0.5 feet thick and water depth of 0.6 feet at maximum outflow total 1.1 feet which leaves a 1.0
foot free -board with the primary dewatering device dysfunctional as required in Section 4.05.6 (11)(e),
Regulations of the Colorado Mined Land Reclamation Board
�o�a -� - --
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1•.:' _ ...� 17Q. 0 000 o
I N I O I i'
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lei
r Projected configuration i
of pond bottom
I
�._..
Approximate -high waterline location- _ _ -o - -o,
2.79
52.5
Pipe grade 2.79;-52.5'-5.3%
Screen mesh 0.05'X 0.
-2.2'
\ Approximate embankment
/T break-in -slope t �
------------------- ----------- - - - - -- - - - --'-
estimated
- - -- 672
projected
Riser slots are O.I'X 0.25'
and 0.2 X 0.3' in size. There
r e' are a total of 37 slots.
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A
a
B'
000
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At the Explosive Storage Area Sedimentation Pond measure -
manta are established on the high waterline mark- Distances
are measured from this reference to embankment breaks -In-
o
E slope and water level as of 7 June 90. Pond bottom Is a pro -
)action. Inasmuch as embankment breaks -in -slope and water-
s
lines are slightly Irregular on this pond, volume calculations are
t based on measurements that define polygonal expressions of
a these boundaries- Therefore, area calculations based on these
' geometric configurations are diminished 5 percent to accom-
modate these irregularities.
a
7 =
o
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palowiisa S'-I
SEDIMENT POND DESIGN SPECIFICATIONS*
Total volume = 0.27 acre feet
Depth= 3 feet
Embankment square length =65 feet
Dewatering device 2.0 foot pipe
SEDIMENT POND 'AS FUNCTIONING' STATISTICS
Total volume = 0.366 acre feet "
Death= 5.5 fee4
Sideslopes, variable 1.6 to 2.3 feet horizontal: 1 foot vertical
Embankment polygonal area (nearly rectangular)
4220 square feet*
Dewatering device 2.0 foot pipe
*Refer to report
RECEIVED
*SOURCE: JUL 2 0 1993
Colorado Mined Land Reclamatloq Boer
Meadows Nc.1 Mine DDlvislon 0 Minerais a 6e,
Permint No. C-81-029
Sun Coal Company, Inc.
Revised June 30, 1986
7480
0
F
%i�SSrONAl-
RECEIVED
JUN 71993
SEP 2 8 1992
000556112 2
a