HYDRO24529

• Permit No: M1996052
• IBM Index Class Name: Hydrology
• Doc Date: 10/21/2004
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Owens Brothers Concrete Company
• 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]
www.watecstate.w.us
Janet Owens White
Owens Bros. Concrete Co.
5550 Sheridan Blvd.
Arvada, CO 80002-7020
October 14, 2004
RECEIVEp
OCT p 12004
Division ~f Minerels and GeoloBY
RE: Del Camino Sand and Gravel P' M-96 052 j
Section 32, T3N, R67W, 6th P. M.
Water Division 1, Water District 5, Weld Count)r
Dear Janet
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Russell George
Executive Director
Hal D. Simpson, P.E.
State Engineer
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We have received your letter of September 14, 2004, 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 October 2, 2003.
The anticipated net depletion for this plan is 35.70 acre-feet per year for up to 6.45 acres of
water surface exposed after December 31,1980. According to t:he information submitted, no water
surface was exposed within the reclamation permit boundary prior to January 1, 1981.
You had previously provided a monthly breakdown of the annual depletions made up of
16.03 acre-feet of evaporation loss, 2.00 acre-feet of water used and consumed for dust control, and
17.67 acre-feet of water lost with 600,000 tons of mined product. No phreatophyte credit has been
applied to this plan, however, due to partial subirrigation of the historically irrigated acreage, a credit
of 1.31 acre-feet of consumptive use of groundwater has been applied. The subirrigation was
deterrnined to be approximately 9% over the entire mining area.
The sources of replacement water are O.i shares of the Last Chance Ditch and fully
consumable water from the City of Longmont. Replacements during the historical irrigation season
will be provided by the 0.1 shares of the Last Chance Ditch, which yields 9.17 acre-feet of
consumptive use credits. The consumptive use credit was adjusted to account for the historical
subirrigation of the irrigated lands. The lease with the City of Longmont will provide a total of 6.35
acre-feet of water from August through October. According to sl phone conversation between the
SEO and you in September 2004, Owens Bros. Concrete Co. is currently selling the gravel mining
operation and the new owners will file for a substitute water supply plan to cover depletions which
accrue to the river after October 2004. As of the date of this letter, no such plan request has been
received by the SEO. Of the 6.35 acre-feet of lease waterfrom the City of Longmont, approximately
0.33 acre-feet will cover transit losses (5.5% total based on 0.5°/~ per mile for the 11 miles from the
City of Longmont wastewater treatment plant to the Det Carriino Pit). The amount of City of
Longmont replacement water that reaches the Del Camino Pit i:> 6.02 acre-feet.
I hereby approve the proposed substitute water supply plan in accordance with §37-90-
137(11), C.R.S., subject to the fo{lowing conditions: