2009-05-26_REVISION - M1993041 ‎(3)‎

• Permit No: M1993041
• IBM Index Class Name: REVISION
• Doc Date: 5/26/2009
• Doc Name: Submittal
• From: CEMEX
• To: DRMS
• Type & Sequence: TR2
• Media Type: D
• Archive: No

The following chart shows the monthly expected evaporation rate based on a free water surface
evaporation rate of 40 inches per year, distributed among each month according to the
percentages provided in the State Engineer's "Guidelines for Substitute Water Supply Plans."
January 0.1'
February 0.117'
March 0.183'
April 0.3'
May 0.4'
June 0.483'
Jul 0.5'
August 0.45'
September 0.333'
October 0.233'
November 0.133'
December 0.1'
Cemex will store or replace by substitution as necessary the total volume of water
currently stored in the quarry pits; plus water pumped from the pits for use in dust suppression
from November 1, 2008 through April 1, 2009; plus evaporation loss from November 1, 2008
through April 1, 2009. During this time period, Cemex ptunped 6.7 acre-feet of water from the
quarry pits for use in dust suppression. The approximate evaporation loss, based on a surface
area of 2.78 acres, was 1.48 acre-feet. In total, since November (the start of the water year),
Cemex has stored or used out-of-priority approximately 25 acre-feet of runoff.
Cemex proposes to utilize the following water rights as sources for substitution water: (1)
Cemex's Dowe Flats Storage Right and (2) C-BT units owned by Cemex classified for
multipurpose use.
The decree in Case No. 83CW374 allows storage of 5,900 acre-feet of water at reservoir
sites located within the Dowe Flats property. The decreed source of the stored water is "St.
Vrain Creek and unnamed tributaries thereto, including run-off." The water rights are decreed
for: domestic, commercial, industrial, recreational piscatorial, irrigation, agricultural,
augmentation, replacement, and exchange purposes. When and if the Dowe Flats Storage Right
comes into priority this spring, Cemex requests that the water right be credited for the water that
Cemex had previously collected and stored out-of-priority in the Dowe Flats quarry pits pursuant
to § 37-80-120(1), C.R.S. (2008).
Any of the 25 acre-feet of substitution water that is not supplied by the exercise of
Cemex's Dowe Flats Storage Right as of June 15, 2009, Cemex will provide for with a
substitution of C-BT water on or before June 15. The requisite number of C-BT units will be
placed at the Water Conunissioner's disposal for release into the St. Vrain.