2010-12-17_REVISION - C1981019 ‎(29)‎

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 12/17/2010
• Doc Name: Map 25E Sheet 3 of 9 Collom Access Road Profile & Road Template
• Type & Sequence: PR3
• Media Type: M
• Archive: No

COLLOM ACCESS ROAD PROFILE
PROFILE BREAK
L M
N
O
P
JUBB CREEK
R
S
A
148 +39 151 +13
B
C
CULVERT
D
193 +92
9 +06.6
28 +59.49
35 +88.9
49 +37.7
66 +85.8
78 +04.8
7300
O
O
O
O
O
O
O
O
O
O
72001
U
7200
O
O
O
O
T
17100
J
J
J
J
O
O
O
7100
O
O
O
O
O
O
J
J
J
J
J
J
7000
7000.
U
1-
>
16800
69001
> j
ORIGINAL GROUND
>
>
6900
U
U
U
6800
U
U
U
68001
U U
U
6700
O
16400
67001
6600
16300
120 +00
6600'
6500
ROAD DESIGN
145 +00
0.24% -4.85%
-1.12% -0.12%
-0.23%
0.12%
1.94%
1.17%
6400
64001
6300
ORIGINAL GROUND
63001
0 +00
10 +00 20 +00
30 +00
40 +00
50 +00
60 +00 70 +00
80 +00
PROFILE BREAK
L M
N
O
P
O
R
S
132 +53
148 +39 151 +13
160 +10
175 +74
179 +65.1
187 +36
193 +92
199 +60.3
73001
17300
O
O
O
O
O
O
O
O O
O
O
O
17200
U
U
72001
U
U'
O
O
O
O
T
17100
J
J
J
J
710
O O
O
O
O
O
O
O
J J
J
J
J
J
J
J
7000.
U
U
>
16800
69001
> j
ORIGINAL GROUND
>
>
>
=
O
J
U
68001
U U
U
O
16400
67001
5.12%
16300
120 +00
6600'
ROAD DESIGN
145 +00
I
6500,
64001
63001
i
145 +00
150 +00
160 +00 170 +00
180 +00
190 +00
200 +00 210 +00 220 +00
LEGEND
— ORIGINAL GROUND (PREMINE TOPO)
— ROAD DESIGN
CULVERT LOCATIONS
Construction Notes:
This road has been designed to meet the applicable portions of Colorado DRMS Rule 4.03.1 for Haul Roads. It is specifically
designed to meet the applicable regulations as well as Rio Tinto internal road design guidelines while minimizing additional
disturbed area and preventing environmental damage. Other design requirements are shown below:
1. The field engineer shall have the discretion to move the road centerline horizontally a distance of up to 200 feet in any direction
as necessary to meet field conditions as long as the slopes and widths are maintained.
2. Maximum road grade is generally less than 5.1 % as shown on the profile.
3. Cross fall slopes between centerline and road shoulders shall be between 1 and 2 percent as directed by the field engineer.
4. Design width shall be as shown on the cross - section.
5. Asphalt pavement specifications shall be per Thyssen Krupp Robins report recommendations based on a 30 year design life with a
16" thick base course (gravel) and 8.5" asphalt thickness based on 50 ton coal haul trucks with axle loads of about 81 psi. This
specification assumes an R -20 silly sand subgrade material. Base course shall be CDOT Class 6 aggregate.
6. A 6 foot high berm shall be used at all locations where the roadway is elevated.
7. Roadway signage shall be added as appropriate.
8. Reflectors and Guideposts shall be installed as appropriate per Rio Tinto road standards.
9. Cut slopes shall be 0.5H:1V or less when completed incompetent rock. Cut slopes in unconsolidated materials shall be laid back at 2H.-1V
or less as directed by the field engineer.
10. Requirements for fill placement shall be as specifically described in Rule 4.03.1 Haul Roads (3) (e) "Road embankments ". Key elements of these requirements
are summarized below.
All vegetation material and topsoil shall be removed from the embankment foundation during construction. The existing giround shall be plowed, stepped, or
keyed in as required by this regulation. The material for embankments shall be reasonably free of organic material, coal, frozen materials, wet or peat material,
natural soils containing organic matter, or any other material considered unsuitable for use. Material containing by volume less than 25 percent of rock larger
than 6 inches in greatest dimension shall be spread in successive uniform layers not exceeding 12 inches in thickness beifore compaction. Where the material
for an embankment consists of large -size rock, broken stone, or fragmented material that makes placing it in 12 inch layers impossible, the embankment shall be
constructed in uniform layers not exceeding in thickness the approximate average size of the rock used. Each layer of the embankment shall be completed,
leveled, and compacted before the succeeding layer is placed. Embankment layers shall be compacted as necessary to lensure that the embankment is
adequate to support the anticipated use. Material shall be placed in an embankment only when its moisture content is within acceptable levels to achieve design
compaction. Embankment slopes shall not be steeper than 2H: 1V, except where the embankment material is a minimum 85 percent rock. In this case, slopes
shall not be steeper than 1.35H:1V.
11. Drainage from haul road shall be directed to the pit(s) wherever possible. All culvert outlets shall have djorap erosion protection installed.
12. A ditch shall be installed at toe of all cut slopes.
13. If needed, temporary erosion control measures shall be implemented during construction to minimize sedimentation and erosion until permanent control measures
can be established. The field engineer shall determine the need for control measures during construction. Such temporary and permanet control measures
would include silt fences, straw bales, straw wattles, rock check dams, or other measures such as downstream sediment control.
1 " =500'
i
230 +00
E
91 +84.0
240 +00
ii 0h
T
246 +73
250 +00
F G
107 +58.4 114 +27
e,
260 +00
H
I
J
K
PROFILE BREAK
118 +97
123 +86
132 +53
136
+31
,
2
Z
2
Z
a
17300
O
O
O
O
LL
O
O
W
17200
U
U
U
U
U'
O
O
O
O
T
17100
J
J
J
J
7000
16900
U
U
U
U
16800
16700
2.86%
6600
.6500
16400
16300
120 +00
130 +00
140 +00
145 +00
270 +00
275 +58.9
TYPICAL COLLOM ACCESS ROAD TEMPLATE
70
280 +00
\j
\
W
2%
2%
W
a
a
LL_
LL
O
O
W
W
U'
U'
O
O
T
19.
191
70
280 +00
Centerline of
Pavement
GRAVEL ACCESS
111 =10'
ENGINEER'S CERTIFICATION
7300
7200
7100
7000
6900
6800
6700
6600
6500
6400
6300
290 +00
1, THOMAS C. PETERSON, being a
Licensed Professional Engineer in
the State of Colorado, do hereby
certify that this map has been prepared
to meet the applicable portions of Colorado
DRMS Rule 4.03.1 for Haul Roads.
0 L f 0F,�GG
o i
)
32257 =
THOMAS C PETERSON
P.E. No. 32257
,31r— /0
DATE
(SAR 2 OMo
Division of i�eclarnatio
Mining and Safety
\j
\
0%
2%
2%
1%
Centerline of
Pavement
GRAVEL ACCESS
111 =10'
ENGINEER'S CERTIFICATION
7300
7200
7100
7000
6900
6800
6700
6600
6500
6400
6300
290 +00
1, THOMAS C. PETERSON, being a
Licensed Professional Engineer in
the State of Colorado, do hereby
certify that this map has been prepared
to meet the applicable portions of Colorado
DRMS Rule 4.03.1 for Haul Roads.
0 L f 0F,�GG
o i
)
32257 =
THOMAS C PETERSON
P.E. No. 32257
,31r— /0
DATE
(SAR 2 OMo
Division of i�eclarnatio
Mining and Safety