Fine grading was considered to spread the material properly. Fine grading is based on
Appendix G of the WDEQ/LQD Guideline 12. The equipment selected is a caterpillar 16M Motor
Grader.
8.3.11 Soil and Erosion Protection
Until revegetation has been fully established the use of soil and erosion protection is necessary
to ensure slope stability. The use of fiber rolls as a best management practice will be observed
along the TSF western tailings edge, at the crest, along the toe and slope face of the
embankment.
8.3.12 Revegetation
The goal of the reclamation program is to return disturbed lands to a condition similar to clayey
upland habitat. Revegetation will consist of placing topsoil/growth media over the affected areas
and amending with additional pure live seed (purchased by a local vendor) applied with a tractor
spreader. Mulch will then be applied using a large power mulcher.
The revegetation of groundwater monitoring wells and surface water sampling sites is based on
Appendix L of WDEQ/LQD Guideline 12.
Seeding – Mixtures and Methods.
Two seed mixes are proposed; Seed Mix #1 is to be used
for final revegetation while Seed Mix #2 is a hybrid nurse cover crop to be used for
miscellaneous temporary disturbances. The basic seeding technique used for reclaiming the
disturbance at the Site will be tractor seeding with application of mulch.
Plant Propagation and Tree and Shrub Planting.
Plant propagation and planting trees and
shrubs are not recommended due to the arid climate and to avoid not blending in with nearby
natural habitat.
Fertilizer.
The revegetated areas will not receive fertilizer, only the application of mulch.
Revegetation Alternatives.
RER may consider alternative revegetation techniques to be
presented in future updates of the closure plan.
Irrigation.
The revegetated areas will receive only natural precipitation as the primary form of
irrigation.
Miscellaneous Closure.
The miscellaneous closure items include cutting and folding the pond
liner in place, excavating the Underdrain Pond pipe from the TSF and grouting and installing a
pipe cap, hauling hazardous waste if needed, supplying and installing a geotextile on the TSF to
support cover installation, and laboratory testing costs.
It is estimated to take about 2 days to complete this work. The pond liner will be buried in place
as part of the cut to fill backfilling.
It is assumed the pipe from the TSF to the Underdrain Pond will not be buried deep and only a
small excavation will be required at the southeast side of the TSF in order to expose, cut, and
cap the pipe.
The installation of the geotextile will require a site-specific plan developed by the manufacturer
and the construction team. In general, the geotextile rolls are laid out by hand in an overlapping
configuration. The panels are secured together with plastic ties. The soil cover is advanced over
the geotextile from plug-dumped piles using a Caterpillar D4C-LPG.
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