PERMFILE107565

• Permit No: C1981039
• IBM Index Class Name: Permit File
• Doc Name: MLRD 11/22/91
• Section_Exhibit Name: Reclamation Project Binder
• Media Type: D
• Archive: No

C. The reclamation seed mix differed slightly from the proposed
seed mix in that a number of forbs were dropped from the list
and an extraordinarily large quantity of winter rye was added.
It was noted that the forbs which were dropped had a
comparatively higher cost. Winter rye was apparently
drill-seeded at a rate of 27 pls/acre while all other species
combined were applied at 18 pls/acre. Winter rye can be a
competitive threat to the establishment of a diversified stand
of perennials. Staff vegetation specialists suggest that the
use of this quantity of winter rye is marginally acceptable
without employment of haying prior to the setting of seeds.
D. Vegetative cover values on newly reclaimed sites must be
documented with field sampling when preparing hydraulics
designs. It is unjustified to indicate that the canopy cover
of the reclaim is 507 while the ground cover is 807 without
empirical data.
Revision Adequacy Concerns
1. The inslopes of Pond No. 4 are extraordinarily steep along the
top 9 feet of the pond (447-507.). This will be a problem if
the pond is retained on a permanent basis, and contradicts the
recommendation found in the October 18, 1990 ACZ submittal that
-~ the pond should have 3:1 slopes. The aforementioned submittal
also recommended that Oitch 4-1 enter the pond on a 4:1
• livestock ramp. While the Division understands that Rockcastle
is withdrawing from their request to leave Pond No. 4 as
permanent at this time, I believe that the company could
accommodate re-configuration concerns quite easily while
re-grading the overlying slope. Please modify the plan view,
capacity table, and stage/storage curve on the Pond No. 4
Design Plate accordingly.
2. Rule 4.05.6(11)(f) indicates that the combined upstream and
downstream side slopes of the embankment shall be no steeper
than 5:1. I measure both the inslope and outslope at 2:1.
Please modify the upslope portion of the embankment to
accommodate this regulatory requirement. When modifying the
design ensure that Rule 4.0.5.6(il)(h), the regulation on
minimum top width, is in compliance.
3. Please commit to providing a post-grading certification of the
pond and the overlying slope upon completion of the project.
4. The open channel emergency spill~aay shows rip-rap along the
crest. The operator must provide documentation that flow from
the 25 year-24 hour event on the outslope is non-erosive, or
submit designs to armor the spillway to protect the integrity
of the embankment during a flood. (Rule 4.05.6(3)(d)>.
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