HYDRO27975

• Permit No: M1990098
• IBM Index Class Name: Hydrology
• Doc Date: 6/27/2005
• Doc Name: substitute water supply plan
• From: office of the state engineer
• To: dmg
• Media Type: D
• Archive: No

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STATE OF COLORADO
OFFICE OF THE STATE ENGINEER
Division of Wa[er Resources
Department of Natural Resources
1313 Sherman Stree4 Room 818
Denver, Colorado 80203
Phone [phone]
FAX [phone] June 21, 2005
vvww.water.state.co. us
RECEIVED
Donald E. Frick
Applegate Group, Inc. JUN 21 2005
1499 West 120"' Avenue, Suite 200
Denver, CO 80234-2728 / Division of Minerals and Geology
Re: Perry Pit Substitute Water Supply Plan, M-90-098
Section 25, TIN R67W, 6`h P. M.
Water Division 1, Water District 2
Dear Mr. Frick:
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Bill pwens
Governor
Russell George
Executive Direc[or
Hal D. Simpson, P.E.
State Engineer
We have received your request of February 8, 2005 and payment of $217 for the renewal
of the referenced substitute water supply plan that expired December 31, 2004.
The substitute supply plan accounts for a variable amount of exposed lake surface that
increases from 6.6 acres in April 1998 to an anticipated 16 acres in December 2005. The entire
lake surface was first exposed after December 31, 1980. Consumptive use of water at the
property consists of evaporation from the pond surface area and water lost in product as shown
in the attached table entitled Glover Analysis Input. No water is needed for dust suppression
associated with the wet mining operation. The delayed impacts to the river are determined
using a Stream Depletion Factor of 30 days. We agree with the calculations in this table.
The ultimate plan for the source of replacement water is recharge ponds that will be
operated through an agreement with the Brighton Ditch Company. The recharge ponds, or
sumps, were used to recharge water during 1998 and 1999 using water diverted when there
was no call on the river. The accretions to the river that resulted from the recharge were
calculated using a Stream Depletion Factor of 280 days. Those accretions are shown in the
attached table entitled Stream Depletion Analysis Using Stream Depletion Factors, dated
February 2, 2005. We agree with the calculations in this table..
Currently, the recharge ponds are not being utilized pending a final agreement with the
Brighton Ditch Company. Until the agreement is finalized reusable effluent will be leased from
Consolidated Mutual Water Company {Consolidated) and the St. Vrain Left Hand Water
Conservancy District (Left Hand). Water leased from Consolidated, in the amount of 34.72
acre-feet, will be used to replace depletions during the months of April 2005 through October
2005. Of the 34.72 acre-feet of lease water from Consolidated, approximately 3.02 acre-feet
will cover transit losses {9.5% based on 0.5% per mile for 19 miles). Water leased from Left
Hand, in the amount of 11.69 acre-feet, will be used to replace depletions during the months of
January 2005 through March 2005 and November 2005 through December 2005.
I hereby approve this substitute water supply plan, in accordance with Section 37-90-
137(11), C.R.S., subject to the following conditions: