2016-08-19_REVISION - M1977559

• Permit No: M1977559
• IBM Index Class Name: Revision
• Doc Date: 8/19/2016
• Doc Name: Request for Technical Revision
• From: Valco, Inc.
• To: DRMS
• Type & Sequence: TR4
• Email Name: TC1
• Email Name: WHE
• Media Type: D
• Archive: No

.AMCASTLE ROCK
CONSULTING
ENIIANCiNG TRADITIONAL SOLUTIONS WITII INNOVATION
• No additional Russian olive trees will be planted, and those existing and other noxious
trees will be removed in accordance with state and county recommendations. Per our
visit with the DRMS, sufficient numbers of volunteer trees have been established on-site
to fulfill the needs of tree planting for wildlife habitat.
• Dead trees stockpiled in the plant area will be mulched and distributed with the
reclamation process. The larger logs, will be properly weighted with concrete rubble and
placed beneath the water surface to increase fish habitat for small species.
• The hardened concrete slope backfill will be drilled with a quarry/blasting drill from the
top of the slope to the water's edge, to facilitate soil drainage from the surface soils to the
un-mined alluvial materials below the concrete. The drill pattern will be approximately
ten feet on centers,both directions. After drilling, top soil will be stripped from the area
of un-mined sand and gravel materials south of the plant area and stockpiled for reuse.
Exposed sand and gravel materials will be excavated, and spread for a drainage soil layer,
between the topsoil and drilled concrete slope backfill below. Backhoe test pits revealed
that sufficient materials exist to accomplish covering the concrete areas with this sand
and gravel material. Holes drilled in the concrete areas will facilitate proper subsurface
soil drainage of the seeded topsoil.
• Some of the concrete rubble produced in demolishing fuel storage structures will be
placed below water, at the toe of the hardened concrete slopes. This concrete rubble will
act as a"shelf' for the drainabe soil materials to rest on near the water's edge, to achieve
3:1 slopes and underwater fish habitat
• After all slope work has been achieved, the topsoil stripped and stockpiled will be spread
to a depth of approximately six inches over the drainage soil layer, using equipment as
necessary. All areas will be graded to gently drain towards the pond, and not off-site.
Well-aged manure from the nearby prison working farm may be spread at a rate of
3CY/1000sf or approximately 130CY/per acre to improve the topsoil.
• The area from the former shop parking area to the fuel storage areas will remain
"graveled"with on-site materials or concrete paved for use as parking areas associated
with recreational uses. Recreational uses will include boating, fishing, hunting, picnic
areas and tables. Similarly, the concrete slabs and graveled area near the aggregate
bunkers will not be topsoiled, to allow for parking and access to this area. These existing
locations are shown on the attached map, and are approximate in final dimensions. Reuse
of these remaining slabs and graveled areas will reduce the acreage of reseeding by
approximately 1.9 acres.
• Access trails around the perimeter of the two ponds will remain graveled to facilitate use
by all-terrain or four-wheel-drive vehicles.
• The alluvial well (Permit#22830F)will be abandoned per the State Engineer's Office
(SEO)guidelines, and the concrete well structure will be removed during reclamation, to
allow final grading.
• Locations described above are illustrated on the attached Area Map and Detailed
Reclamation Area Map.
536EAST2ADAVMVUE CAST7.EROC14 CO80108 [phone] [phone]FAX STAAFE7B?5PE9A0,LC0M