2012-07-03_HYDROLOGY - M1977023

• Permit No: M1977023
• IBM Index Class Name: HYDROLOGY
• Doc Date: 7/3/2012
• Doc Name: SUBSTITUTE WATER SUPPLY PLAN
• From: DWR
• To: DRMS
• Email Name: GRM
• Media Type: D
• Archive: No

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%
Mr. Peter Foster, P.E.
June 28, 2012
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 Tess 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.
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 nos. 1 and 3, you have indicated that a bond has
been obtained for $155,814 through the Division of Reclamation, Mining, and
Safety ( "DRMS "). This bond is for reclamation requirements under the current
mining permit but may not be sufficient for lining or backfilling the pit to ensure
that depletions from groundwater evaporation do not occur in the unforeseen
event, or events, that would lead to the abandonment of the Pit. Future SWSPs for
this site will not authorize any expansion of the area of exposed ground water until
the Applicant provides documentation that a bond sufficient to cover lining or
backfilling of the pit has been obtained.
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
revoked prior to adjudication of a permanent plan for augmentation all use of water
at the pit must cease immediately.