HYDRO20305

• Permit No: M2002120
• IBM Index Class Name: Hydrology
• Doc Date: 3/13/2006
• Doc Name: Water Supply Plan
• From: OSE
• To: Leaf Engineering
• Permit Index Doc Type: Correspondence
• Media Type: D
• Archive: No

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D S F ~ STATE OF COLORADO
OFFICE OF THE STATE ENGINEER og cotfl
Division of Water Resources ~~','
Department of Natural Resources ~N< '
1373 Sherman Street, Room 818 I' ~. ~
Denver, Colorado 80203 ~ + fete + ~
Phone [phone] March 6, 2006
FAX [phone]
Bill avem
www.watecstate.co.us / RECEfVED Governor
/ Russell George
Executive Director
Mr. Forrest Leaf -~ VMAR t 3 ?006 Hal D. Simpson, P.E.
leaf Engineering State Engineer
820 13"' Street iivision rrf Minerals and Geelo~y
Greeley, CO 80631
Re: Bernhardt Pit, Substitute Water Supply Plan
DMG File No. M-2002-120/
Sections 1 and 12, T4N, R67W, 6'" P. M., Adams County
Water Division 1, Water District 2 and 4
Approval Period: January 1, 2005 through December 31, 2006
Dear Mr. Leaf:
We have received your letters of December 14, 2004 and August 22, 2005, requesting
renewal and amendment of the above referenced substitute water supply plan to cover depletions
caused by an existing gravel mining operation operated by Hall-Irwin. The required fee of
$217.00 for the renewal of this substitute water supply plan ("SWSP") has been submitted (receipt
no. 532970). The original supply plan was approved January 14, 2004.
Plan Operation
This plan seeks to replace depletions resulting from mining operations at the Bernhardt
pit. The depletions that result from the mining operation are evaporation, water lost in mined
product, concrete batching, dust suppression and dewatering. The proposed replacement
source is excess augmentation credits leased from the Town of Milliken. The leased water is
excess augmentation credits from Milliken's 2006 SWSP, filed under case no. 02CW339. That
plan is currently valid through December 31, 2006.
Depletions
An alluvial well has been constructed to provide water for concrete batching. This well
was constructed under permit no. 60729-F and is located outside the boundaries of the existing
slung wall. Total estimated annual consumptive use for the alluvial well is 24.55 acre-feet in
both 2005 and 2006. The water withdrawn from the alluvial well is considered 100%
consumptive. The depletions from the well were lagged to the stream system using a Glover
analysis and assuming the parameters specified in Table 1 below.
Ground water is exposed at the site in dewatering trenches and settling ponds. The
ground water exposed at this site during 2005 was 12.93 acres and the water exposed at the
site during 2006 is estimated to be 10.72 acres. The annual depletion due to evaporation from
the area exposed after December 31, 1980, is 37.26 acre-feet in 2005 and 30.89 acre-feet in
2006.
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