HYDRO27690

• Permit No: M1978056
• IBM Index Class Name: Hydrology
• Doc Date: 3/7/2006
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: DMG
• Permit Index Doc Type: Correspondence
• Media Type: D
• Archive: No

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STATE OF COLORADO
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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]
wwwwatecstate.co.us
Re: Durham Pit, ubstitute er Su I Pla
DMG Fife No. M-78-056 ~
Sections 3, 9, and 10, T5N, R65W, 6`" P.M.
Water Division 1, Water District 3, Weld County, Colorado
March 2, 2005
RECEIVE®
Cheryl Signs, P.E. / ~AR 01 20U6
Cheryl Signs Engineering `~
109 East Fourth Avenue Division of Minerals and Geology
Denver, CO 80203
Approval Period: January 1, 2006 through December 31, 2006
Contact Phone Number for Ms. Cheryl Signs: 303-778-7653
Dear Ms. Signs:
Bill Owens
Governor
Russell George
Executive Diretmr
Hal D. Simpson, P.E.
State Engineer
We have reviewed your letter dated November 15, 2005, requesting renewal of the above
referenced substitute water supply plan to cover depletions caused by an existing gravel mining operation.
The required fee of $217 for the renewal of this substitute water supply plan has been submitted. The.
original plan was approved on May 24, 2004.
The anticipated net depletion for this plan, based on the numbers provided in the substitute water
supply plan report, is 214.11 acre-feet per year. The currently exposed groundwater at the site totals 41
acres. According to the information submitted, 44.6 acres of water surface was exposed within the
reclamation permit boundary prior to January 1, 1981. The plan anticipates that a total of 123.8 acres of
water surface will be exposed at the site if dewatering ceases. This results in 79.2 acres of exposed
surface area requiring replacement of depletions from evaporation (if dewatering ceases).
You have provided a monthly breakdown of the annual depletions made up of 187.85 acre-feei of
net evaporative loss, 20.14 acre-feet of water lost with the mined product (which represents 684,932 tons
of mined product), 2.8 acre-feet of water used for dust control, and 3.32 acre-feet used for concrete
hatching. Annual evaporation on 79.2 acres was estimated to be 212 acre-feet; however, phreatophyte
credits of 24.2 acre-feet per year have been applied to this plan, which reduced the net evaporation
depletions to 187.85 acre-feet per year.
The proposed source of replacement for this pit is 48.7 acre-feet (93.18 acre-feet of headgate
deliveries and 44.5 acre-feet of return flow obligations) of historic stream depletions from the dry-up of 33.7
acres of land historically irrigated with five shares of Greeley Irrigation Company's interests in Greeley
Canal No. 3 and 2.9 acre-feet (4.9 acre-feet of deliveries and 2 acre-feet of return flow obligations) of
historic stream depletions in the applicant's interest in the Fossil Creek Reservoir diverted from the Cache
la Poudre River and previously used for irrigation of the mined property. The values for the historical use
credits of the five shares of Greeley Canal No. 3 were prorated from the historical use analysis values
decreed for the Greeley Irrigation Company in Case No. 96CW658. Based on the 2006 mining production
and the proposed expansion of use of the mining area, there will be a total demand of 260.63 acre-feet per
year if dewatering ceased (The 260.63 acre-feet amount includes the return flow obligations of 2 acre-feet
per year from Fossil Creek Reservoir and 44.5 acre-feet per year from the Greeley Canal No. 3). After