2009-11-03_HYDROLOGY - M1978052

• Permit No: M1978052
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/3/2009
• Doc Name: Combined Replacement Plan
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: DB2
• Media Type: D
• Archive: No

t
Sira W. Sartori
October 27, 2009
Plan Operation
Page 2
According to the current SWSP request the Howe Pit, Mann Lakes Pit, and the Fort Lupton
Lakes are active mining sites and the Fort Lupton Pit is an inactive reserve sites which Lafanae will
resume mining once it is economically feasible. The gravel pits are located as shown on attached Figure
1.
This plan identifies replacement sources to cover depletions from the multiple mine sites. The
following table lists the sites that are involved in this combined replacement plan:
TABLE A - COMRINF11 RFPI ArFMFMT PI AM CITCC
Current

Site Name
DRMS # Previous
Well Permit New Permit Exposed Surface
Approval No Required (acres)
Howe Pit M-78-052 03/27/2009 67261-F No 26.6-pre-81

Mann Lakes
M-82-147
03/27/2009
56354-F
No _
0.0*

Ft. Lupton Pit
M-85-088
03/27/2009
55577-F
No _
4.0

Lupton Lakes
M-04-078
03/27/2009
66625-F
No _
10

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Depletions
The total annual losses resulting from evaporation, water lost in product, dust control and
concrete batching are shown in the following table:
TABLE B - LOSSFS

Site Name Evaporation
Losses
(ac-ft) Lost in
Product
(ac-ft) Dust
Control
(ac-ft) Concrete
Batching
(ac-ft) Total

(ac-ft) Total
Lagged
(ac-ft)
Howe Pit 0 0 0 25.0 25.0 25.9
Mann Lakes 0 0 0 0 0 1.1
Ft. Lupton Pit 11.7 0 0 0 11.7 11.7

Lupton Lakes
29.9
35.3
42.6
0
107.8 _
113.5

TOTAL
41.6
35.3
42.6
25.0
144.5 _
152.2
Lafarge does not anticipate dewatering any of the sites during the period of this SWSP. Lupton
Lakes site was dewatered from May 2008 through September 2008. The lagged dewatering depletions
after the dewatering stopped from November 2009 through October 2010 equal 7.5 acre-feet as shown
in the attached Table 2. To determine the delayed impact to the South Platte River you estimated that
the pond was dewatered at a rate of 1,200 gallons per minute and decreasing to 200 gallons per iminute
for 8 hours a day, 365 days a year.
As long as the pit is continuously dewatered, the water returned to the stream system should be
adequate to offset the depletions, however once dewatering at the site ceases, the river will experience
a net depletion as the pits gradually fill. At least three years prior to completion of mining, a plan must be
submitted that specifies how the post pumping dewatering depletions (including refilling the pit) will be