PERMFILE53799

• Permit No: M2004078
• IBM Index Class Name: Permit File
• Doc Date: 3/30/2005
• Doc Name: Response to First Adequacy Review Hydrology Comments
• From: Civil Resources LLC
• To: DMG
• Media Type: D
• Archive: No

Mr. Tom Schreiner, Division of Minerals and Geology
March 23, 2005
Page 8
~~
CIVIL RES'JU RCES,LLC
requiring that lagged depletions to the river that result from mining be replaced. The applicant will submit
the required information to the OSE for their approval prior to exposing or pumping groundwater.
Lupton Lakes Sand & Gnvel Mine
Operaional Losses
Month P¢reent of
Annual
Aggregate
Production Amount of
Aggregate
Production

(m:1 tarter LOS/
WiN Minetl
Aggregate

IrrxaO Amount of
Concrete
Production

bB1 tarter LOS/
In LoncrMe
Botching

I~+aW Water Used
for Oust
LonVal

1~>~0 Total
Operational
Losses

(~xra Lagging
Factors

(xl Lagged
Operational
Losses

I~~enO
January 3.8% 57,427 1.69 5743 0.59 007 2.35 6.8% 4.19
February 4.6% 69,142 203 fi914 0.71 O.W 2.84 6.4% 3.93
March 55% 82,695 243 8270 085 0.70 338 6.3% 387
April 9.6% 144,257 4.24 14426 1.49 0.18 591 66% 408
May 12.5% 187443 551 18744 1.93 023 L68 U% 4.75
June 13.9% 209,035 6.15 20904 2.15 0.26 8.56 9.0% 553
July 139% 209,035 6.15 20904 2.75 11.26 B56 10.0% fi.17
August 125% 187,443 5,51 18744 1.93 0.23 768 10.6% 652
September 9.6% 144,257 424 14426 149 0.18 5.91 106% 648
Otlober 5.5% 82,695 2,43 8270 0.85 0.10 338 g8% 600
November 46% 69,142 203 fi914 071 0.09 2.84 B.5% 525
December 3.8% 57,/27 1.69 5743 059 007 235 76% 467
ialal I00% 7,500,(100 N.I 750,OW 75.5 7.9 fif.4 7lW% 67.1
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19. The applicant states on page 20 that they will appty for an NPDES Water Discharge Permit with
the Water Quality Control Division prior to discharging water from the site. Please commit to
securing the approval of such permit from the Water Quality Control Division prior to any water
discharge oHsite, and providing written verification of such approval to the Division of Minerals and
Geology prior to any water discharge offsite.
As mentioned in the Reclamation Permit application, the applicant commits to obtaining a CDPS permit prior
to off-site discharge. The applicant will submit a copy of the approved permit to the Division.
Groundwater Model -Lupton Lakes Project :Civil Resources LLC, February 2005
20. The applicant states on page 6 of the report that the monthly groundwater data collected
indicates a slight hydraulic gradient of approximately 0.17 percent toward the South Platte River to
the northwest. Please explain or clarify what is meant by a gradient of 0.17 percent toward the
South Platte River.
As discussed in Section 3.11 of the Groundwater Model Report and as presented in Appendix B of the
Groundwater Model Report, Civil Resources performed a slope calculation to detennine the groundwater
gradient (slope of the groundwater). We calculated a drop of 0.0017 feet per foot. The gradient vector for