HYDRO28176

• Permit No: M1999120
• IBM Index Class Name: Hydrology
• Doc Date: 6/28/2004
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Wright Water Engineers Inc
• Media Type: D
• Archive: No

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OFFICE OF THE STATE ENGINEER
Division of Water Resources
Department of Natural Resources
1313 Sherman Street, Room 818
Denver, Colorado 80203
Phone [phone]
FAX [phone]
wvrw.waterstate.m.us
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STATE OF COLORADO
RECEIVED
June 23, 2004 JUN 2 8 2004
Rachel Peterson / Oiuision ~f Minerals and Geology
Wright Water Engineers, Inc. /
2490 West 26°i Ave., Suite 100A
Denver, CO 80211
Re: Substitute Water Supply Plan, Ft. Lupton Pit (M-99-120)
Section 30, T2N, R66W, 6'" P.M.
Water Division 1, Water District 2, Weld County
Dear Rachel:
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Bill Owens
Governor
Russell George
&ecutive Director
Hal D. Simpson, P.E.
Srate Engineer
We have received your letter of October 16, 2003, requesting renewal of the above
referenced substitute water supply plan to cover depletions caused by an existing gravel pit lake.
The required fee of $217.00 for_the,renewal of this substitute_supplyptan has been submitted. The
original supply plan was approved on September 12, 2001 and was most recently renewed on
January 14, 2002.
The anticipated net depletion for this plan is 41 acre-feet per year for up to 2.32 acres of
water surface exposed after December 31, 1980 from dewatering trenches, 3 lined settling
ponds and a sump pond. According to the information submitted, no water surface was exposed
within the reclamation permit boundary prior to January 1, 1981.
A slurry wall has been constructed around the perimeter of the site to hydraulically
disconnect the mine from the surrounding groundwater system. This slurry wall design has been
approved but the construction has not been approved. Once mining has been completed, the
site will consist of two lined ponds separated by the East Fork of the Lupton Bottom Ditch.
You have provided a monthly breakdown of the annual depletions totaling 6.86 acre-feet
of evaporative loss, 3 acre-feet of water used and consumed for dust control, 26.55 acre-feet of
water lost with 900,000 tons of the mined product, and 4.6 acre-feet of water used and
consumed in hatching concrete. No phreatophyte credit has been applied to this plan.
An existing well, permit no. 56746-F currently provides the process water for this
operation. Due to the fact that a slurry wall has been constructed around the entire site, all
consumption will originate at the site from the well providing water. This well will be located
between the slurry wall and the river.
The proposed sources of replacement for this pit are 14 acre-feet of reusable water
leased from the City of Greeley and 0.52 shares of Lupton Bottom Ditch. The 0.52 shares of the
Lupton Bottom Ditch are part of 2.25 shares that were historically used to irrigate 95 acres of
com and small vegetables. Assuming a 10% ditch loss and a 55% irrigation efficiency, the dry-
yearconsumptive use of the 2.25 shares was determined to be 138 acre-feet. The prorated
consumptive use for the 0.52 shares is 32.1 acre-feet.