REV05698

• Permit No: M1985029
• IBM Index Class Name: Revision
• Doc Name: FAX COVER
• From: DOW
• To: LARRY OEHLER
• Type & Sequence: AM3
• Media Type: D
• Archive: No

DOW COLD SPRINGS

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TEL [phone]
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r~~y 23,90 I11~47 No.006 P.03

Hydraulic calculations and cross-sections
the designs;
to derive
The measures outlined in options 1 and 2 will inimize the
potential for flooding to occur in the disturbed rea as well
as to help ensure compliance with other applicab a State and
Federal requirements.
Please see the discussion in Exhibit D under the {yew heading
"Discharge/Flood Protection".
13. Site Stability - Excavation
It appears from the contours on Plate 4 that all xcavations
will be flooded. The Division recommends that eclamation
Resources predict the feasible depth oP excava ion. This
limit may be determined by a number of factors su h as depth
of groundwater, equipment limitations, and stora a Capacity
for ground water inflows in the recirculation pon s.

It is unclear in the application what the maxi um area of
excavation will be at any one time during the oper ion. This
information is necessary for determining the vo ume oP pit
inflows. Please Clarify.
The placement of fill into excavations within he permit
boundary may constitute placement of fill mat rial into
wetlands and/or waters of the United States. Th applicant
should contact the Corps of Engineers regarding t e need for
a 404 Permit, and submit copies of all correspond nce to our
office.
Please see the variety changes in Exhibit E, and c mments in
Exhibit G, 8evised Hydrology. A site inspection by an Army Corps
of Engineers representative was performed, and as a result
Reclamation Resources has. committed to mapping all wetl nds in the
southern part of the permit area. ,~~ ~h~Q
14. Water Management System - Impoundment Design ,~+ ~cY ~ ;
Reclamatien Resources has proposed the const
impoundments for Water management purgoses. The C
concerns regarding the design of these ponds. To
impacts to the surrounding hydrologic balanc
minimized, the Division requests that water balan
phase of the mining operation be Included in the a
Each water balance should include all hydrologic
outputs for that particular phase Of the operati
result for each phase is a net excess, then
Resources should specify how the excess water will
If the net result for each phase is a water defi
specify where the make-up will come from.
otion of
ision has
rift' that
will be
for each
lication.
nputs and
If the
s handled.
.t, please