GENERAL38933

• Permit No: C1981037
• IBM Index Class Name: General Documents
• Doc Name: DISCUSSION AND DESIGN GUIDELINES
• Permit Index Doc Type: RECLAMATION PROJECTS
• Media Type: D
• Archive: No

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MAXIMUM GRADES FOR HAUL ROADS
Overall Pitch Permissable Length
Road Class Grade % Grade % of Pitch Grade
Class 1 10 15 300 (Maximum
length within
100 feet)
Class 2 10 15 300 (length)
Llass 3 ~10 20 1.000 (consecutively
fil. TRANSVERSE GEOMETRY
fhe transverse geometry, the cross section of the road are
~f great importance especially in ensuring good drainage
~f the road and stable construction.
fhe Regulations specify the width of haul roads re-
luired. Skelly and Loy's report gives the following
iesign guide for vehicles up to 100,000 pounds gvw.
fhe width for 1-lane (23 ft.) and 2-lane (40 ft.) haul
roads on curves are shown in Table 2.
TABLE 2
RECOMMENDED WIDTHS FOR HAUL ROADS
(Curve Radius One-Lane Two-Lane
(Ft.*) Haul Way Haul Way
25 21 48
50 25 44
100 24 42
200 23 41
tan ent 23 40
Source: 9
*On the inner edge of the pavement.
If the area upstream of the haul road is also disturbed,
all runoff from the road must be passed through a sedi-
ment basin [816.42]. Therefore it is clearly best to
try to concentrate road era inage at a few selected
points. This will mean the use of roadside ditches,
usually located on the upslope side of the road, with a
reverse fall on the whole roadbed so that all drainage
flows to the ditch (Fig. 2). This will mean a culvert
under the road at each sag in the vertical profile.
In steep terrain where most haul roads will be on cut
and fill. a down slope ditch would have to be located
on fill (Fig. 3) and would be liable to washout unless
lined. The reverse fall also prevents overland flow
from upslope areas flowing onto the road. Lross-slope
to give rapid drainage of surface water should be :-V,"/
ft (10). However in flatter terrain such an arrange-
ment or a cambered road with a ditch on both sides fs
possible when road is in total cut
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Curves on haul roads should normally be supe relevated
(banked) for greater safe-operating speeds. Super-
elevations will normally be banked into the slope of
the land at crests and away at sags which allows most
drainage to be handled in upslope ditches as suggested
above. The Regulations do not specify supe relevat ions,
but Skelly and Loy's report gives criteria for calcula-
ting supe relevations necessary on high-speed haul roads.
The Regulations specify maximum slopes for cuttings
and embankments on haul roads for Class I and II roads.
These are shown in Tables 3 and 4.
TABLE 3
MAXIMUM CUT SLOPES FOR NAUL ROADS
Road Class Unconsolidated Material Rock
Class I 1v:1.5h 1v:0.25h
Class II 1v:1.5h 1v:0.25h
Class III no standards soecified
TABLE 4
MAXIMUM SLOPES FOR EMBANKMENTS IN HAUL ROADS
Road Class Unconsolidated Fill Rock
Class I lv:2h 1v:1.35h
Class II 1v:1.5h lv:l .35h
Class II1 no standards soecified
Topsoil in9 and temporary erosion control measures are
required for Class 1 and II roads in the perfo nuance
standards for slopes of 1v:1.5h or flatter (i.e. those
slopes not in rock or con strutted of rock fill).
IV. DRAINAGE [816.153, 816.163 AND 816.173]
On Class 1 roads the drainage system must be designed
fora 10-yr, 24-hr precipitation event. Sedimentation
control for all classes of roads must comply with
Sections 816.42 and 816.45 requiring that all runoff
from "disturbed areas" be passed through sedimentation
ponds; however, Section 816.42 (a)(4) notes that "dis-
turbed areas" do not include those areas in which
only roads are installed if the area upstream of the
road is not "otherr/ise disturbed." Natural drainage
channels may not be altered without the approval of
the RA and may not be altered at all in the case of
Class 1[I roads. Drainage structures are required
for all stream crossings.
4:1 Ditches are required for Class i road (on both
sides of a throughout and on the inside shoulder of
a cut-and-fill section). Ditches are not necessar-
ily required for Class II roads where ditches,
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GROUP MOBILIZATION AND MINING OPERATIONS HANDBOOK ~ •
FOR
MEASURES HAUL ROADS SMALL MINE
OPERATORS
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