HYDRO25622

• Permit No: M1978210
• IBM Index Class Name: Hydrology
• Doc Date: 3/26/2007
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Clear Water Solutions
• 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]
http://www.water.state.w.us /
Mr. Steve Nguyen, P.E. /
Clear Water Solutions VVV
13228 Shadow Canyon Trail
Broomfield Co 80020
March 21, 2007

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RECEIVED Bill Ritter, Jr.
Governor
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~~~~ Harris D. Sherman
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1IIIXXXXIIIISSSS U / Executive Director
Division of Reclamation Hal D. Simpson, P.E.
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Mining and Safety State Engineer
/ /
RE: Substitute Water Supply Plan, Geisert Pit, M-78-210
Section 31, T6N, R85W, 8th P.M.
Water Division 1, Water District 3
Approval Period: April 1, 2007 through March 31, 2008
Contact Phone Number for Mr. Steve Nguyen: 303-929-0758
Dear Mr. Nguyen:
We have reviewed your letter of January 8, 2007, requesting renewal ofthe above referenced substitute
water supply plan to cover depletions caused by an existing mining operation. Weld County operates this site to
produce aggregate for road base and public works construction projects. The required fee of $257.00 for the
renewal of this substitute supply plan has been submitted. The original supply plan was approved on March 25,
1994 and it was most recently renewed on March 9, 2006.
Weld County continues to mine the remaining cell (14.6 acres) deeper. The gravel reserve is
approximately 50 feet deep. No additional water surface area will be disturbed in 2007 therefore the total
exposed surface area at this site remains 42.6 acres. According to the information submitted, 6 acres of water
surface was exposed within the reclamation permit boundary prior to January 1, 1981. This results in 36.6
acres of exposed surface area requiring, replacement of depletions from evaporation. The anticipated net
depletion for this plan is 112.2 acre-feet per year. No dewatering is provided or sought under this plan.
You have provided a monthly breakdown of the annual depletions totaling 107.3 acre-feet of
evaporative loss, 2.00 acre-feet of water used and consumed for dust control, and 2.9 acre-feet of water lost
with the mined product (100,000 tons of aggregate). Precipitation data used for the calculation of the
evaporative loss has been updated for this site. The average precipitation from the Greeley UNC weather
station for the years 1967 to 2005 was used to determine the consumptive use from evaporation. The
average precipitation for this time period is 14.1 inches. No phreatophyte credit has been applied to this plan.
A stream depletion model was used to determine the lagged depletions to the Cache La Poudre River. The
following parameters were used in the model: transmissivity (T)=120,000 gallons per day per foot, specific
yield (SY)= 0.2 (which is typical for an alluvial aquifer), the distance of the exposed ground water to the
river=300 feet, and the location of the parallel impermeable boundary was estimated to be 2,700 feet
from the stream (based on the USGS Geologic Map of the Boulder-Fort Collins-Greeley Area, Colorado).
The source of replacement water to be used for this plan is a lease of 112.2 acre-feet of reusable
effluent from the City of Greeley. Weld County has a perpetual lease with the City of Greeley for the right to
use up to 300 acre-feet per year of the Greeley's reusable effluent. A copy of the lease agreement with the
City of Greeley for 112.2 acre-feet of fully consumable effluent from Greeley's wastewater treatment plant