HYDRO22703

• Permit No: M1977153
• IBM Index Class Name: Hydrology
• Doc Date: 2/5/2003
• Doc Name: Substitute Water Supply Plan
• From: SEO
• To: Environment Inc.
• Media Type: D
• Archive: No

STATE OF COLORADO
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]
wwn¢wa[ecsta[e.co.us
February 4, 2003
RECEIVED "~
Stevan L. O'Brian / FEB 0 5 2003
Environment, Inc.
7985 Vance Drive, Suite 205A Division of Minerals and Geology
Arvada, CO 80003
Re: Substitute Water Supply Plan, Hazeltine Pit (M-77-153)
Section 4, Township 2 South, Range 67 West, 6th P.M.
Water Division 1, Water District 2, Adams County
Dear Mr. O'Brian:
OF c~(p
yep ~~
~ 1876 ~
Bill Owens
Gavemor
Greg E. Walther
Executive Director
Hal D. Simpzoo, P,E.
State Engineer
This letter is in response to your application for a substitute water supply plan for the Hazeltine Pit
in accordance with Section §37-90-137(11), C.R.S. The required fee for the substitute water supply plan
has been submitted.
The anticipated net depletion for this plan is approximately 152 acre-feet for 56.6. acres of
groundwater exposed after December 31, 1980. According to your letter of December 3, 2001,
approximately 23.4 acres of groundwater was exposed prior to 1981. It is estimated that a total of 80
acres have been exposed at the site, leaving a balance of 56.6 acres exposed after 1980 that would
require augmentation for evaporation. All mining has ended at this time, thus there are no other uses of
water at this site. Presently, the pit is being dewatered to maintain an exposed pond area of approximately
6.5 acres, which is less than the amount of groundwater exposed prior to 1981. As long as the amount of
exposed groundwater at this site is less than the 23.4 acres exposed prior to 1981, no replacement of
depletions from evaporation is required. In the event that the dewatering pumps are stopped, and more
than 23.4 acres of groundwater are exposed, sufficient additional replacement water must be dedicated to
this plan to replace depletions from evaporation resulting from the area of groundwater exposed after
1980. The evaporative depletions resulting from 56.6 acres are estimated to be approximately 152 acre-
feet. The monthly depletion and replacement requirements are found on the attached table.
The source of replacement water for this plan consists of 25 shares of the Fulton Ditch owned by
Albert Frei and Sons, Inc and a commitment from Denver Water to lease any additional water needed in
the event that more than 23.4 acres of groundwater are exposed. The 25 shares of the Fulton Ditch haue
reportedly been used to irrigate approximately 41 acres in the eastern portion of this site. Diversion
records for Fulton Ditch for the dry years of 1954, 1963,1977, 1994, and 2002 indicate the average annual
diversions as 27,276 acre-feet for a total of 7,185 shares. The pro-rata diversions for the applicant's 25
shares equal 94.91 acre-feet. Assuming a 10% ditch loss and an irrigation efficiency of 50%, the amount
of water available for crop consumption is 42.71 acre-feet per year. As excess waterwas provided prior to
the growing season, the amount consumed by the crop is estimated to be 39.2 acre-feet. In the event the
dewatering pumps are stopped and the pit is allowed to fill with water, the annual amount of replacement
water to be obtained from Denver Water is approximately 113 acre-feet (152 acre-feet Tess 39.2 acre-feet
of consumptive use credit).