16 Tex. Admin. Code § 12.570 - Primary Roads
Primary roads shall meet the requirements of § 12.569 of this title (relating to Roads: General) and the additional requirements of this section.
(1) Certification. The construction or
reconstruction of primary roads shall be certified in a report to the
Commission by a qualified professional engineer with experience in the design
and construction of roads. The report shall indicate that the primary road has
been constructed or reconstructed as designed and in accordance with the
approved plan.
(2) Safety Factor.
Each primary road embankment shall have a minimum static factor of
1.3.
(3) Location.
(A) To minimize erosion, a primary road shall
be located, insofar as is practicable, on the most stable available
surface.
(B) Fords of perennial or
intermittent streams by primary roads are prohibited unless they are
specifically approved by the Commission as temporary routes during periods of
road construction.
(4)
Drainage control. In accordance with the approved plan:
(A) 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 Commission;
(B) 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;
(C) drainage ditches shall be constructed and
maintained to prevent uncontrolled drainage over the road surface and
embankment;
(D) 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;
(E) natural stream channels
shall not be altered or relocated without the prior approval of the Commission
in accordance with applicable §§12.509-12.511 and §§
12.513-12.524 of this title (relating to
Hydrologic Balance: General Requirements, to Hydrologic Balance: Water-Quality
Standards and Effluent Limitations, to Hydrologic Balance: Diversions, to
Hydrologic Balance: Sediment Control Measures, to Hydrologic Balance: Siltation
Structures, to Hydrologic Balance: Discharge Structures, to Hydrologic Balance:
Acid-Forming and Toxic-Forming Materials, to Hydrologic Balance: Permanent and
Temporary Impoundments, to Hydrologic Balance: Underground Mine Entry and
Access Discharges, to Hydrologic Balance: Surface- and Ground-Water Monitoring,
to Hydrologic Balance: Transfer of Wells, to Hydrologic Balance: Water Rights
and Replacement, to Hydrologic Balance: Discharge of Water Into an Underground
Mine, to Hydrologic Balance: Postmining Rehabilitation of Sedimentation Ponds,
Diversions, Impoundments, and Treatment Facilities, and to Hydrologic Balance:
Stream Buffer Zones); and
(F)
except as provided in paragraph (3)(B) of this section, 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 Commission shall
ensure that low-water crossings are designed, constructed, and maintained to
prevent erosion of the structure or stream bed and additional contributions of
suspended solids to streamflow.
(5) Surfacing. Primary roads shall be
surfaced with material approved by the Commission as being sufficiently durable
for the anticipated volume of traffic and the weight and speed of vehicles
using the road.
Notes
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