2006-12-19_REVISION - M2001107

• Permit No: M2001107
• IBM Index Class Name: Revision
• Doc Date: 12/19/2006
• Doc Name: Adequacy Review Response
• From: J&T Consulting, Inc.
• To: DRMS
• Type & Sequence: TR3
• Media Type: D
• Archive: No

NCCI Pit #1, Technical Revision No. 3 Adequacy Review Response, File No. M-2001-107 12/1 R/2006
7iG'
for the remaining two wells. The waivers are attached for your reference.
The two remaining wells are the only groundwater users within the cone of depression that
results from full dewatering of the pit with no recharge activities. Although NCCI has waivers for
these two wells, NCCI proposes to install recharge ditches/ponds along the perimeter of the
mine in order to limit the extent of the cone of depression/radius of influence to that of condition
2 above (360 feet). This will minimize the affect on the two wells and ensure that no other
groundwater users are adversely affected by the dewatering activities at the mine. After the
implementation of the recharge ditches/ponds around the mine, NCCI will note what the
groundwater depths are in their monitoring wells and maintain those levels throughout the
course of the mining.
The following figure is a graphical representation of the estimated cone of depression/radius of
influence that results from the dewatering activities:
CONE OF DEPRESSION
WITH NO RECHARGE
-3-
- 760' (
41
RECHARGE ~I~
DITCH/POND '=1zCC II
~i~
3'-5'
CONE OF DEPRESSION
WITH RECHARGE
E%I$TING GROUNDWATER
LEVEL
DEWATERING 27' DEPTH
TRENCH
2. Please discuss the mining phases jor the site, and the acreage of affected land at any given time.
In particular, NCCI is currently approved to mine no more than 10 acres that would cover one
section or portions ojtwo sections and with a total disturbance at any time of 25 acres.
NCCI plans to maintain the approved 10 acre active mining area at the site. The active mining
area will progress through the 7 approved phases as shown on the mining plan map. While the
10 acre active mining area will remain the same as the approved plan, NCCI proposed to
increase the allowable total area of disturbance from 25 acres to potentially the entire area
planned to be mined. The total area of disturbance would include, at any point in time, the
current active mining area, the previously mined areas, the overburden stockpile areas, and the
processing area.
NCCI's intent is to complete the reclamation of previously mined areas as soon as possible after
they are mined in order to minimized the total area of disturbance at the site. Because NCCI is
currently in negotiations with an end use buyer for the pit, and is in the process of determining
what they will require the pit liner system to be, they have not started the reclamation process.
NCCI does not want to construct a liner that may need to be removed and/or re-constructed to
meet the buyer's requirements. Once the pit liner requirements have been finalized, it is NCCI's
intent to reclaim all previously mined areas concurrently with the mining activities.
NCCI will ensure that the Division will have sufficient bond to cover the cost of completing the
reclamation of the site. See response to item number 6 below for bonding details.
1400 W 122"° Avenue -Suite 120 • Westminster CO 80234 • Ph: 303-457-0735 • Fax: [phone]