2014-09-04_HYDROLOGY - M1977023

• Permit No: M1977023
• IBM Index Class Name: HYDROLOGY
• Doc Date: 9/4/2014
• Doc Name: Substitute water supply plan
• From: Division of Water Resources
• To: Wright Water Engineers, Inc.
• Email Name: RCO
• Media Type: D
• Archive: No

Mr. Peter Foster, P.E.
August 29, 2014
Page 6
(b) For fields not deep tilled or chemically treated to successfully kill alfalfa or native
grass, records of monthly monitoring of depth to ground water at existing irrigation
wells or existing or new monitoring wells or piezometers within % -mile of each
alfalfa or native grass field must be maintained. Credits will be reduced
according to the following table when depth to ground water is less than the depth
assumed to provide no significant contribution to native grass or alfalfa growth.
Measurements taken at the start of each month will determine the necessary
reduction in credit to be applied during the following month. The applicant may
use another methodology upon review and approval by the state engineer and
division engineer.
Depth to Ground Water
(Feet)
Percent Reduction in CU Credit'
Native Grass
Alfalfa
1
85%
100%
2
50%
90%
3
30%
75%
4
20%
50%
5
15%
35%
6
10%
20%
7
5%
15%
8
0%
10%
Adapted from EVAPOTRANSPIRATION AND AGRONOMIC RESPONSES IN FORMERLY IRRIGATED
MOUNTAIN MEADOWS, South Park, Colorado, March 1, 1990, Revised September 1, 1991
14. In accordance with the letter dated April 30, 2010 (copy attached) from the
Colorado Division of Reclamation, Mining, and Safety ( "DRMS "), all sand and
gravel mining operators must comply with the requirements of the Colorado
Reclamation Act and the Mineral Rules and Regulations for the protection of water
resources. The April 30, 2010 letter from DRMS requires that you provide
information to DRMS to demonstrate you can replace long term injurious stream
depletions that result from mining related exposure of ground water.
In accordance with approach no. 4, you have provided a letter dated April 30, 2013
that dedicates 3.125 cfs of the Applicant's 4.33 cfs in the Seventy Five Ditch water
as replacement water solely for this SWSP for as long as there are depletions at
this gravel pit site or until such time as another replacement source is obtained. A
copy of the April 30, 2013 letter is attached to this SWSP. For the purposes of this
SWSP, this letter will be accepted for the dedication of the shares; however, if the
State Engineer determines that a different affidavit or dedication process is
necessary to assure proper dedication of the shares, additional information may
be required prior to future SWSP approvals.
15. This substitute water supply plan may be revoked or modified at any time should it
be determined that injury to other vested water rights has or will occur as a result of
this plan. Should this substitute water supply plan expire without renewal or be