_INSPECTION - C1981019 ‎(55)‎

• Permit No: C1981019
• IBM Index Class Name: INSPECTION
• Doc Name: Inspection Report
• Inspection Date: 8/13/2008
• Email Name: JRS
• Media Type: D
• Archive: No

IV. ENFORCEMENT ACTIONS
Colowyo C-1981-019
13 August 2008
Page 3/5 ��
to be more than 15 feet deep and 15 feet wide. The gully is in unconsolidated spoil
material and the material appeared to have a similar composition to the material
that is in the inlet of the Prospect Pond. This gully will need to be repaired.
The second gully was on the north side of the Prospect Ditch and it, too, went from
the top of its respective slope to the boundary with the undisturbed drainage. This
gully varied in width and depth from approximately five feet deep and three feet
wide to approximately ten feet deep and ten feet wide. There was some large rock
that was dumped in the top portion of this gully in what was either an attempt to fix
the gully or to make it into a more stable drainage. Again, this gully is in
unconsolidated spoil material and the material appears to be similar to the material
at the inlet of the Prospect Pond. This gully will also need to be repaired.
Based on the above information, the Division believes that Colowyo is in violation of
the following Rules:
Rule 4.01 .1 (7) "Minimum disturbance to the prevailing hydrologic balance at the
mine site and in associated off-site areas, and to quality and quantity of water in
surface and ground water systems"
Rule 4.05.3(1)(d) "Diversions and collection drains that are used to transport water
into water-treatment facilities... Be designed, located, constructed, maintained and
used so as not to increase the potential for downstream flooding, or otherwise
endanger property or public safety"
Rule4.05.3(1)(e) "Diversions and collection drains that are used to transport water into
water-treatment facilities... Be designed, located, constructed, maintained and used
to minimize adverse impacts to the hydrologic balance, and to be stable"
Rule 4.05.3(3) "...permanent diversions shall be constructed to pass safely the peak
runoff from a precipitation event with a 10-year, recurrent interval, or a larger event
as specified by the Division for good cause shown. Permanent diversions shall be
constructed with gently sloping banks that are stabilized by vegetation. Asphalt,
concrete, or other similar linings shall be used only when approved by the Division to
prevent seepage or to provide stability"
Rule 4.05.3 (4) "Diversions shall be designed, constructed, and maintained in a
manner which prevents additional contributions of suspended solids to streamflow
and to runoff outside the permit area, to the extent possible using the best
technology currently available..."
Rule 4.05.3 (7)(a) "Diversion design shall incorporate the following... Channel linings,
including channel riprap, shall be designed using standard engineering practices to
pass safely the design velocities"