Ill. Admin. Code tit. 62, § 1816.151 - Primary Roads
Primary roads shall meet the requirements of Section 1816.150 and the additional requirements of this Section.
a) Certification. The construction or
reconstruction of primary roads shall be certified in a report submitted to the
Department by a qualified registered professional engineer within thirty (30)
days after completion of construction. For purposes of this Section, completion
of construction shall mean the road is being used for its intended purpose as
determined by the Department. The professional engineer shall be experienced in
the design and construction of roads, as evidenced by the placement of a
registered professional engineer's seal on the report. The report shall
indicate that the primary road has been constructed or reconstructed as
designed and in accordance with the approved plan.
b) Safety Factor. Each primary road
embankment shall be shown to have a minimum static factor of safety of
1.3, or shall be
designed in compliance with the following design standards:
1) The embankment foundation area shall be
cleared of all organic material and the entire foundation surface shall be
scarified;
2) If the natural slope
of the foundation as measured at right angles to the roadway center line is
steeper than 8H:1V, the embankment shall be benched into the existing slope
beginning at the embankment toe and then filled with compacted level
lifts;
3) The embankment fill
material shall be free of sod, large roots and other large vegetative
matter;
4) The fill shall be
brought up in horizontal layers of such thickness as required to facilitate
compaction in accordance with prudent construction standards;
5) The moisture content of the fill material
shall be sufficient to secure proper compaction;
6) The side slopes of the embankment shall be
no steeper than 2H:1V;
7) Maximum
fill height shall be twenty-five (25) feet as measured from natural ground at
the downstream toe to the top of the embankment;
8) Embankments shall have a minimum top width
of (H + 35)/5, where "H" is the embankment height as measured from natural
ground at the downstream toe to the top of the embankment, and shall be
adequate for the intended use.
c) Location.
1) To minimize erosion, a primary road shall
be located, insofar as is practicable, on the most stable available
surface.
2) Fords of perennial or
intermittent streams by primary roads are prohibited unless they are
specifically approved by the Department as temporary routes during periods of
road construction.
d)
Drainage control. In accordance with the approved plan:
1) Each primary road shall be constructed or
reconstructed, and maintained to have adequate drainage control, using
structures such as, but not limited to bridges, ditches, cross-drains and ditch
relief drains. The drainage control system shall be designed to safely pass the
peak runoff from a 10-year, 6-hour precipitation event, or greater event as
specified by the Department as necessary to ensure proper drainage control
design in accordance with prudent engineering practices;
2) Drainage pipes and culverts shall be
installed as designed, and maintained in a free and operating condition and to
prevent or control erosion at inlets and outlets;
3) Drainage ditches shall be constructed and
maintained to prevent uncontrolled drainage over the road surface and
embankment;
4) Culverts shall be
installed and maintained to sustain the vertical soil pressure, the passive
resistance of the foundation, and the weight of vehicles using the
road;
5) Natural stream channels
shall not be altered or relocated without the prior approval of the Department
in accordance with applicable sections of 62 Ill. Adm. Code
1816.41
through
1816.43 and
1816.57;
and
6) Except as provided in
subsection (c)(2) above, structures for perennial or intermittent stream
channel crossings shall be made using bridges, culverts, low-water crossings,
or other structures designed, constructed, and maintained using current,
prudent engineering practices. The Department shall ensure that low-water
crossings are designed, constructed and maintained to prevent erosion of the
structure or streambed and additional contributions of suspended solids to
streamflow.
e)
Surfacing. Primary roads shall be surfaced with material approved by the
Department as being sufficiently durable for the anticipated volume of traffic
and the weight and speed of vehicles using the road.
Notes
Amended at 20 Ill. Reg. 2027, effective January 19, 1996
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