2012-05-15_HYDROLOGY - M1981022

• Permit No: M1981022
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/15/2012
• Doc Name: SUBSTITUTE WATER PLAN
• From: OSE
• To: APPLEGATE GROUP
• Email Name: MAC
• Media Type: D
• Archive: No

•
9 DEPARTMENT OF NATURAL RESOURCES
°'1 DIVISION OF WATER RESOURCES
May 15, 2012
Mr. Jared Dains
Applegate Group, Inc.
1499 West 120 Avenue, Suite 200
Denver Co 80234 -2728
RE: G.L. Substitute Watef Supply Plan (WDID 0302518)
G.L. Pit, DRMS No.kM -1981 -022 (WDID 0303008)
NW1 /4 Section 3, T7N, R69W, 6th P.M.
Water Division 1, Water District 3, Larimer County
Approval Period: June 1, 2012 through May 31, 2013
Contact Phone Number for Mr. Jared Dains: 303 - 452 -6611
Dear Mr. Dains:
John W. Hickenlooper
Governor
Mike King
Executive Director
Dick Wolfe, P.E.
Director /State Engineer
RECEIVED
' MAY 15 2012
Division of Reclamation,
Mining & Safety
Your letter dated April 12, 2012, requesting renewal of the above referenced substitute
water supply plan to cover depletions caused by an existing gravel mining operation has been
reviewed. The required fee of $257 for the renewal of this substitute water supply plan has
been submitted (receipt no. 3654847). The original plan was approved on March 26, 1993 and
was most recently renewed on August 16, 2011.
Plan Operation
Mining at the G.L. Pit has been complete since 2002. The original reclamation plan
included constructing a lined water storage reservoir. In February 2011, the Division of Mining,
Reclamation, and Safety (DRMS) approved Technical Revision 02 (TR -02) changing the
reclamation plan to eliminate the lined reservoir and instead backfill all ground water exposure.
The previous SWSP request stated that the backfilling of the site in 2010 reduced the exposed
surface area from 4.2 acres to 1.0 acre. According to the Applicant, a more recent survey
shows that the exposed area is actually 2.3 acres in size. This SWSP assumes the acreage to
be 2.3 acres for the entire plan period. Additionally, the lagged depletion model updated the
2011 information to reflect 2.3 acres of exposed ground water. Note that all ground water at this
site was exposed after December 31, 1980.
Depletions
The only consumptive use associated with the G.L. Pit site will be from evaporation of
exposed groundwater. As mentioned above the current exposed surface area at the G.L. Pit is
2.3 acres. Using the previously documented net evaporation rate of 16.76 inches per acre, the
total estimated annual consumptive use for this plan is 3.2 acre -feet of evaporation. The
evaporation rate accounts for phreatophyte credit.
The centroid of the G. L. Pit ground water exposure is located approximately 2,000 feet
from the Cache La Poudre River, thus depletions were not assumed to be instantaneous and
have been lagged back to the Cache La Poudre River. The lagged depletions were estimated
by the Applicant's consultant using the Alluvial Water Accounting System (AWAS) stream
/
Office of the State Engineer Y'1'' , 0 5 6
1313 Sherman Street, Suite 818 • Denver, CO 80203 • Phone: 303 - 866 -3581 • Fax: 303 - 866 -3589
www.water.state.co.us