|
LEGEND
<br />ORIGINAL GROUND (PREMINE TOPO)
<br />COLLOM HAUL ROAD DESIGN
<br />CULVERT LOCATIONS
<br />Construction Notes:
<br />This road has been designed to meet the applicable portions of Colorado DRMS Rule 4,03.1 for Haul Roads. It is specifically
<br />designed to meet the applicable regulations as well as Rio Tinto internal road design guidelines while minimizing additional
<br />disturbed area and preventing environmental damage. Other design requirements are shown below.
<br />1. The field engineer shall have the discretion to move the road centerfine horizontally a distance of up to 200 feet in any direction
<br />as necessary to meet field conditions as long as the slopes and widths are maintained,
<br />2. Maximum road grade is generally less than 5.1 % as shown on the profile.
<br />3. Cross fall slopes between centerline and road shoulders shall be between 1 and 2 percent as directed by the field engineer,
<br />4. Design width shall be as shown on the cross - section.
<br />5. Asphalt pavement specifications shall be per Thyssen Krupp Robins report recommendations based on a 30 year design life with a
<br />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
<br />specification assumes an R -20 silty sand subgrade material. Base course shall be CDOT Class 6 aggregate.
<br />6. A 6 foot high berm shall be used at all locations where the roadway is elevated.
<br />7. Roadway signage shall be added as appropriate.
<br />8_ Reflectors and Guideposts shall be installed as appropriate per Rio Tinto road standards.
<br />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
<br />or less as directed by the field engineer.
<br />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
<br />are summarized below.
<br />All vegetation material and topsoil shall be removed from the embankment foundation during construction. In addition, in areas where the existing ground slope
<br />is 5h:1 v (20 percent) or steeper and the first lift of the embankment will be in soil material, the existing ground below the stripped and removed
<br />vegetation /topsoil layer shall be plowed or stepped before placing the first lift of embankment fill. In areas where the existung slope is steeper that 5h :1v
<br />and the first lift of the embankment will be in bedrock, prior to placing the first lift of embankment fill a keyway shall be excavated into bedrock at least 2
<br />feet in depth and at least 10 feet in width under the proposed embankment toe and continuing along under the embankment toe for as long as these
<br />conditions exist.
<br />The material for embankments shall be reasonably free of organic material, coal, frozen materials, wet or peat material, natuiral soils containing organic matter,
<br />or any other acid - producing or other material considered unsuitable for use. Material containing by volume less than 25 perrcent of rock larger than 6 inches in greatest
<br />dimension shall be spread in successive uniform layers not exceeding 12 inches in thickness before compaction. Where the material for an embankment consists of large -size
<br />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
<br />in thickness the approximate average size of the rock used. Each layer of the embankment shall be completed, leveled, and compacted before the succeeding
<br />layer is placed. Embankment layers shall be compacted as necessary to ensure that the embankment is adequate to support the anticipated use. Material
<br />shall be placed in an embankment only when its moisture content is within acceptable levels to achieve design compaction.. Embankment slopes shall not be
<br />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.
<br />11_ Drainage from haul road shall be directed to the pit(s) wherever possible. All culvert outlets shall have riprap erosion protection installed.
<br />12. A ditch shall be installed at toe of all cut slopes.
<br />13. If needed, temporary erosion control measures shall be implemented during construction to minimize sedimentation and erosiom until permanent control measures
<br />can be established. The field engineer shall determine the need for control measures during construction. Such temporary amd permanet control measures
<br />would include silt fences, straw bales, straw wattles, rock check dams, or other measures such as downstream sediment conttrol.
<br />TYPICAL COLLOM HAUL ROAD TEMPLATE
<br />ti
<br />W W
<br />a a
<br />0 0
<br />W W
<br />0 0
<br />3' 12' 12' W 73' 6'
<br />9�
<br />> Z1"
<br />21 N�� ' gEFM
<br />Centerline of GRAVEL ACCESS
<br />Pavement �b ,
<br />10'
<br />s'
<br />()%
<br />2%
<br />COLLOM
<br />HAUL
<br />ROAD
<br />PROFILE
<br />A
<br />WILSON CREEK
<br />B
<br />C
<br />JUBB CREEK
<br />CULVERT
<br />D
<br />E
<br />F
<br />G
<br />H
<br />I
<br />J
<br />K
<br />CULVERT
<br />PROFILE BREAK
<br />9 +06.6
<br />28 +59.49
<br />35 +88.9
<br />49 +37.7
<br />66 +85.8
<br />78 +04.8
<br />91 +84.0
<br />107 +58.4
<br />114 +27
<br />118 +97
<br />123 +86
<br />132 +53
<br />136 +31
<br />7300
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />2
<br />6,
<br />2
<br />7300
<br />7200
<br />O
<br />O
<br />O
<br />O
<br />O =
<br />O
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<br />7200
<br />7100
<br />O
<br />4
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />UU
<br />7100
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />O
<br />J
<br />J
<br />J
<br />J
<br />O
<br />J
<br />J
<br />7000
<br />W Q
<br />Q W
<br />R
<br />W
<br />4
<br />Q W
<br />W Q
<br />R W
<br />Q W
<br />L
<br />Q W
<br />W L
<br />W
<br />W
<br />7000
<br />690
<br />>
<br />>
<br />>
<br />>
<br />6900
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />6800
<br />U
<br />Cl)
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />6800
<br />6700
<br />6700
<br />6600
<br />12. 88%
<br />6600
<br />6500
<br />ROAD DESIGN
<br />3.50%
<br />6500
<br />6400 0.24%
<br />-4.85%
<br />-1.12%
<br />-0.12%
<br />-0.23%
<br />O.Y2%
<br />i.84%
<br />1.17%
<br />6400
<br />6300
<br />ORIGINAL GROUND
<br />6300
<br />0 +00
<br />10+00
<br />20 +00
<br />30 +00
<br />40 +00
<br />50 +00
<br />60 +00
<br />70 +00
<br />80 +00 90 +00
<br />100 +00
<br />110 +00
<br />120 +00
<br />130+00
<br />140 +00
<br />145 +00
<br />PROFILE BREAK
<br />L
<br />M
<br />N
<br />O
<br />P
<br />O
<br />R
<br />S
<br />T
<br />148 +39 151 +13
<br />160 +10
<br />175 +74
<br />179 +65.1
<br />187 +36
<br />193 +92
<br />199 +60.3
<br />246 +73
<br />275 +58.9
<br />7300
<br />7300
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />7200
<br />Y'
<br />7200
<br />V
<br />U
<br />U
<br />(�.
<br />Z5
<br />C5
<br />U
<br />U
<br />¢
<br />7100
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />O
<br />7100
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />J
<br />7000
<br />¢
<br />¢
<br />¢
<br />¢
<br />¢
<br />¢
<br />¢
<br />¢
<br />"'
<br />4.96%
<br />¢
<br />7000
<br />8900
<br />>
<br />j
<br />ORIGINAL GROUND
<br />>
<br />?
<br />>
<br />>
<br />6900
<br />6800
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />U
<br />6800
<br />6700
<br />5.12%
<br />6700
<br />6600
<br />ROAD DESIGN
<br />6600
<br />6500
<br />6500
<br />6400
<br />6400
<br />6300
<br />6300
<br />145 +00
<br />150 +00
<br />160 +00
<br />170 +00
<br />180 +00
<br />190 +00
<br />200 +00 210
<br />+00
<br />220 +00
<br />230 +00
<br />240 +00
<br />250 +00
<br />260 +00
<br />270 +00
<br />280 +00
<br />290 +00
<br />111 =500'
<br />LEGEND
<br />ORIGINAL GROUND (PREMINE TOPO)
<br />COLLOM HAUL ROAD DESIGN
<br />CULVERT LOCATIONS
<br />Construction Notes:
<br />This road has been designed to meet the applicable portions of Colorado DRMS Rule 4,03.1 for Haul Roads. It is specifically
<br />designed to meet the applicable regulations as well as Rio Tinto internal road design guidelines while minimizing additional
<br />disturbed area and preventing environmental damage. Other design requirements are shown below.
<br />1. The field engineer shall have the discretion to move the road centerfine horizontally a distance of up to 200 feet in any direction
<br />as necessary to meet field conditions as long as the slopes and widths are maintained,
<br />2. Maximum road grade is generally less than 5.1 % as shown on the profile.
<br />3. Cross fall slopes between centerline and road shoulders shall be between 1 and 2 percent as directed by the field engineer,
<br />4. Design width shall be as shown on the cross - section.
<br />5. Asphalt pavement specifications shall be per Thyssen Krupp Robins report recommendations based on a 30 year design life with a
<br />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
<br />specification assumes an R -20 silty sand subgrade material. Base course shall be CDOT Class 6 aggregate.
<br />6. A 6 foot high berm shall be used at all locations where the roadway is elevated.
<br />7. Roadway signage shall be added as appropriate.
<br />8_ Reflectors and Guideposts shall be installed as appropriate per Rio Tinto road standards.
<br />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
<br />or less as directed by the field engineer.
<br />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
<br />are summarized below.
<br />All vegetation material and topsoil shall be removed from the embankment foundation during construction. In addition, in areas where the existing ground slope
<br />is 5h:1 v (20 percent) or steeper and the first lift of the embankment will be in soil material, the existing ground below the stripped and removed
<br />vegetation /topsoil layer shall be plowed or stepped before placing the first lift of embankment fill. In areas where the existung slope is steeper that 5h :1v
<br />and the first lift of the embankment will be in bedrock, prior to placing the first lift of embankment fill a keyway shall be excavated into bedrock at least 2
<br />feet in depth and at least 10 feet in width under the proposed embankment toe and continuing along under the embankment toe for as long as these
<br />conditions exist.
<br />The material for embankments shall be reasonably free of organic material, coal, frozen materials, wet or peat material, natuiral soils containing organic matter,
<br />or any other acid - producing or other material considered unsuitable for use. Material containing by volume less than 25 perrcent of rock larger than 6 inches in greatest
<br />dimension shall be spread in successive uniform layers not exceeding 12 inches in thickness before compaction. Where the material for an embankment consists of large -size
<br />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
<br />in thickness the approximate average size of the rock used. Each layer of the embankment shall be completed, leveled, and compacted before the succeeding
<br />layer is placed. Embankment layers shall be compacted as necessary to ensure that the embankment is adequate to support the anticipated use. Material
<br />shall be placed in an embankment only when its moisture content is within acceptable levels to achieve design compaction.. Embankment slopes shall not be
<br />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.
<br />11_ Drainage from haul road shall be directed to the pit(s) wherever possible. All culvert outlets shall have riprap erosion protection installed.
<br />12. A ditch shall be installed at toe of all cut slopes.
<br />13. If needed, temporary erosion control measures shall be implemented during construction to minimize sedimentation and erosiom until permanent control measures
<br />can be established. The field engineer shall determine the need for control measures during construction. Such temporary amd permanet control measures
<br />would include silt fences, straw bales, straw wattles, rock check dams, or other measures such as downstream sediment conttrol.
<br />TYPICAL COLLOM HAUL ROAD TEMPLATE
<br />ti
<br />W W
<br />a a
<br />0 0
<br />W W
<br />0 0
<br />3' 12' 12' W 73' 6'
<br />9�
<br />> Z1"
<br />21 N�� ' gEFM
<br />Centerline of GRAVEL ACCESS
<br />Pavement �b ,
<br />10'
<br />s'
<br />()%
<br />2%
<br />296
<br />1070
<br />ENGINEER'S CERTIFICATION
<br />1, THOMAS C. PETERSON, being a
<br />Licensed Professional Engineer in
<br />the State of Colorado, do hereby
<br />certify that this map has been prepared
<br />to meet the applicable portions of Colorado
<br />DRMS Rule 4.03.1 for Haul Roads.
<br />� SG•Pfp . iP i
<br />Cj
<br />32257
<br />' " d�Z°l /f • � �
<br />% 'S' /U
<br />THOMAS C PETERSON
<br />P.E. No. 32257
<br />3lz =//7
<br />ZATE
<br />i D
<br />3 2011
<br />
|