2008-02-28_HYDROLOGY - M1978210

• Permit No: M1978210
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/28/2008
• Doc Name: Substitute water supply plan
• From: DWR
• To: Clear Water Solutons, Inc.
• Media Type: D
• Archive: No

DEPARTMENT OF NATURAL RESOURCES
DIVISION OF WATER RESOURCES
Ms. Rachel Kullman, P.E.
Clear Water Solutions, Inc.
8010 S. County Road 5, Suite 105
Windsor, Co 80528
February 21, 2008
RE: Substitute Water Supply Plan, Geisert Pit, M-78-210
Section 31, T6N, R65W, 6th P.M.
Water Division 1, Water District 3
Approval Period: April 1, 2008 through March 31, 2009
Contact Phone Number for Ms. Rachel Kullman: 970-631-6070
Dear Ms. Kullman:
Bill Ritter, Jr.
Governor
Harris D. Sherman
Executive Director
Dick Wolfe, P.E.
Director
We have reviewed your letter of January 23, 2008, requesting renewal of the 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 21, 2007.
Weld County has completed mining in all the cells except the southeastern cell of the mining site. At
build-out, the southeastern cell will expose 14.8 acres. Weld County continues to mine the remaining cell
deeper. The gravel reserve is approximately 50~~~~,.~C.~v~ y.~a[.~,~~l~i~4se.-1 acres
in the southeastern cell. In 2008, Weld County anticipates exposing an additional one acre therefore the total
exposed surface area at this site will be 43.6 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 37.6
acres of exposed surface area requiring replacement of depletions from evaporation. The anticipated net
depletion for this plan is 116.7 acre-feet per year. No dewatering is provided or sought under this plan.
You have provided a monthly breakdown of the annual depletions totaling 110.3 acre-feet of
evaporative loss, 2.00 acre-feet of water used and consumed for dust control, and 4.4 acre-feet of water lost
with the mined product (150,000 tons of aggregate). 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, 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 116.7 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
Office of the State Engineer
1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: [phone] • Fax: [phone]
www.water.state. co.us