HYDRO28824

• Permit No: M2001051
• IBM Index Class Name: Hydrology
• Doc Date: 6/17/2004
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Applegate Group
• Media Type: D
• Archive: No

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OFFICE OF THE STATE ENGINEER
Division of Wa[er Resources
Department of Natural Resources
1313 Sherman Street, Room 818
Denver, Colorado 80203
Phone [phone]
FAX [phone]
www.watecsta[e.w.us
From:
Doc. Name:...S L~
Doc. Date (if no date stamp): __
June 17,2004
Mr. Richard T. Raines
Applegate Group, Inc.
1499 W. 120"' Avenue, Suite 200
Denver, CO 80234-2728
Re: Substitute Water Supply Plan, North Taft Hill Expansion Site (DMG #M-01-051)
Sections 33, TBN, R69W, 6th P.M.
Water Division 1, Water District 3, Lorimer County
Dear Mr. Raines:
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Bill Owens
Governor
Russell George
Executive Director
Hal D. Simpson, P.E.
State Engineer
This letter is in response to your application for a substitute water supply plan for the North
Taft Hill Expansion Site. The required fee of $1,343 forthe substitute water supply plan has been
submitted.
This plan describes the proposed water uses for the period of June 2004 through January
31, 2005 for this new mining operation. Mining will occur in a 13-acre cell. The site will be
continuously dewatered therefore the proposed plan anticipates the net depletions associated with
the groundwater exposed in the dewatering trenches (0.4 acres) and a sediment pond (0.1 acres).
Because this is a new mining operation, no groundwaterwas exposed within the permit boundary
prior to January 1,1981. After the nine months the lake will be allowed to fill, as the mining operation
will begin at the nearby Overland Pond site. Although a substitute water supply plan for the Overland
Ponds site was approved through October 31, 2004, no mining operation began at this site and is
not expected to begin until February 2005.
You have provided a monthly breakdown of the depletions for the nine months of operation,
made up of 0.97 acre-feet of evaporative loss for up to a maximum of 0.5 acres of exposed
groundwater in the dewatering trenches and a sediment pond. Material mined at the North Taft Hill
Expansion Site (previously proposed to be mined at the Overland Ponds site) will be processed at
the adjacent Home Office Pit (M-77-439). Depletions associated with mining of up to 500,000 tons of
aggregate per year (14.7 acre-feet) and 2 acre-feet per year of water used for dust control will be
replaced underthe Home Office Pit Substitute Water Supply Plan. The substitute water supply plan
for the Home Office site is currently valid through October 31, 2004. No phreatophyte credit has
been applied to this plan.
The proposed source of replacement for this pit is net accretion credits at the river that occur
due to the dewatering operation. Based on the information provided the dewatering rate was
assumed to be 1,200 gallons per minute. The timing of the lagged depletions from the dewatering
operations was determined through a stream depletion model for the North Taft Hill site. The model
accounts for the accretions and depletions when the site is being dewatered and the lagged
depletions after the dewatering stops in February 2005.