HYDRO24666

• Permit No: M1998013
• IBM Index Class Name: Hydrology
• Doc Date: 5/13/2004
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Leaf Engineering
• Media Type: D
• Archive: No

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STATE OF COLORADO
OFFICE OF THE STATE ENGINEER I/
Division of Water Resources
Department of Natural Resources
1313 Sherman Street, Room 818
Denver, Colorado 80203
Phone [phone]
FA% [phone]
www.waterstare.w.us
Mr. Forrest Leaf, P.E.
Leaf Engineering.
13946 County Road 56
Hillrose, Colorado 80733
May 4, 2004 'RECEIVED
Re: Shores Gravel Pit, Substitute Water Supply Plan
DMG File No. M-1998-013 /
Section 1 and 2, T2N, R68W, 6"' P.M.
Water Division 1, Water District 5
Dear Mr. Leaf:
MAY 13 2004
Division of Minerals & Geology
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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 of December 3, 2001 requesting a substitute
water supply plan for a sand and gravel pit to be operated by Hall-Irwin Corporation in accordance
with 37-80-120 C.R.S. The Applicants shall be responsible for compliance with this plan, but the
State Engineer's Office may also pursue the landowner, for eventual compliance. The required
fee of $1,343 for the substitute water supply plan has been paid.
This plan describes the proposed water uses for 2004. The proposed plan anticipates a
maximum annual consumptive use of 119.8 acre-feet for up to 28.4 acres of exposed
groundwater. The mining operation is located approximately 5,100 feet from the river,
therefore, the depletions to the stream system are not instantaneous. According to the plan,
86.7 acre-feet of depletions hit the river in 2004 due to the mining operation. No groundwater
was exposed within the permit boundary prior to January 1, 1981.
You have provided a monthly breakdown of the maximum annual depletions totaling
76.22 acre-feet of evaporative loss from a maximum of 28.4 acres of exposed groundwater,
3.68 acre-feet of water used and consumed for dust control, 22.06 acre-feet of water lost with
750,000 tons of mined product and 17.8 acre-feet consumed in the production of 145,000 cubic
yards of concrete. No phreatophyte credit has been applied to this plan.
The source of replacement water is 3.5 shares of Rural Ditch, 10 shares of Boulder &
Weld reservoir and 3 shares of Six Mile No. 2 Reservoir. The 3.5 shares of Rural Ditch was
historically used to irrigate 125 acres, in combination with the Mayfield Seep. Historicaify the
125 acres supported alfalfa, corn, sugar beets and pasture grass. Assuming a 20% ditch loss
and a 55% irrigation efficiency, the dry-year consumptive use of the 3.5 shares of Rural Ditch
was determined to be 159.9 acre-feet. The 10 shares of Boulder & Weld reservoir and 3
shares of Six Mile No. 2 Reservoir were historically used to irrigate 77.5 acres in combination
with the Godding Ditch and Cole Seep. According to Scott Smith, Panama Reservoir
Superintendent, one share of Boulder and Weld Reservoir delivers 65 inches with 20 inches per