2014-11-25_REVISION - M1979191 ‎(22)‎

• Permit No: M1979191
• IBM Index Class Name: REVISION
• Doc Date: 11/25/2014
• Doc Name: Ex. G- Water Information
• From: Martin Marietta
• To: DRMS
• Type & Sequence: AM1
• Email Name: ECS
• Media Type: D
• Archive: No

August 2015
180,000
900,000
September 2015
180,000
850,000
October 2015
180,000
600,000
November 2015
168,000
250,000
December 2015
168,000
150,000
January 2016
72,000
75,000
February 2016
132,000
75,000
March 2016
132,000
800,000
April 2016
144,000
800,000
May 2016
180,000
800,000
June 2016
180,000
900,000
July 2016
180,000
900,000
August 2016
180,000
900,000
September 2016
1 82,800
850,000
Note: Future values are estimated.
Groundwater infiltrating into mine areas is the source for makeup water. Water used for dust
control is taken from water stored in onsite ponds.
MM has applied for and acquired a permit through the National Pollutant Discharge Elimination
System (NPDES) Water Quality Control Division (permit number COG00131).
1.2 Groundwater Modeling
1.2.1 Impacts to Groundwater
Adverse impacts to the local groundwater aquifer have not been observed or reported during past
or current mining phases on either the Veldman or Ditullio Properties within the Three Bells
Mine. Adverse impacts are not anticipated to develop as a result of current or future MM
reclamation in the mined out cells within the Three Bells Mine. GEI has modeled current and post
reclamation groundwater conditions at the Three Bells site utilizing Visual MODFLOW (Version
2011. 1, U.S. Geological Survey (USGS) 2014), and the results indicate that the Ditullio Property
will see less than 1 foot of groundwater impact adjacent to the cells, with impacts lessening as the
distance away from the cells increases. The Veldman Property will experience a 3.5 foot decrease
in ground water immediately south of the property, with impacts lessening as the distance awav
from the cells increases. It is predicted that between the Veldman Propertv and the neighborina
Ky eg_ r Property, the water table will decrease by approximately one foot. The MODFLOW results
are provided in Figures 1 through 316.
1.2.2 Modeling Methods
Groundwater elevations in the baseline (no- liner) model were estimated based on regional
topography and reported groundwater levels where available. Elevations are expressed as feet
above mean sea level.
Topographic elevations across the model area range from 4830 in the north, to 4807 in the
south. Model boundaries were assigned such that the water table matches the regional topographic
slope, with localized now generally toward the Poudre River and Greeley Canal. Head boundaries
of 4825 and 4800 were assigned to the north and south model boundaries, respectively, to