2012-03-30_HYDROLOGY - M2008006

• Permit No: M2008006
• IBM Index Class Name: HYDROLOGY
• Doc Date: 3/30/2012
• Doc Name: SWSP
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: MAC
• Media Type: D
• Archive: No

Mr. Jared Dains
' SerFer SWSP
March 30, 2012
Page 2
amount approved herein until compliance with the DRMS April 30, 2010 letter is documented, or if
DRMS specifically finds the existing bond is insufficient.
Depletions
It is estimated that 202,500 tons of aggregate will be mined during this approval period,
resulting in 2.98 acre -feet of water lost in the mined product, and 2.00 acre -feet of water to be
used for dust control. Gross evaporation at this site is estimated to be 40 inches per year with an
effective precipitation amount of 0.88 feet. For the 1 acre of ground water exposed at this site,
annual net evaporation is 2.45 acre -feet per year. (See attached Tables 1 and 2.)
The lagged depletions from the SerFer Pit were estimated by the Applicant's consultant
using the Alluvial Water Accounting System (AWAS) stream depletion model developed by the
Integrated Decision Support Group with the following assumptions:
• Distance from the gravel pit centroid to the river (X) = 600 ft
• Alluvial aquifer width (W) = 4,300 ft
• Specific yield (S) = 0.2
• Transmissivity (T) = 45,000 (gpd /ft)
The stream depletion model shows that the SerFer Pit's stream depletion will equal approximately
6.86 acre -feet during the approval period as shown in the attached Table 3.
Replacements
The source of replacement water for this plan is excess recharge credit from Connell
Resources Timnath - Connell Pit (M- 1999 -050, WDID 0303018) SWSP (WDID 0302526). As
outlined in the Timnath - Connell SWSP, 2.5 shares of the Box Elder Ditch, owned by Connell
Resources, will be diverted into a recharge site (WDID 0302059) at the Timnath - Connell Pit. The
evaporation losses and operation of the recharge site are covered by the Timnath - Connell Pit
SWSP. This recharge site is located approximately 4 miles upstream of the SerFer Pit location.
Both the recharge site and the SerFer Pit impact the Cache La Poudre River. As such, a transit
loss of 1.0% (0.25% per mile) is assessed to the recharge credits to be used to at the SerFer Pit
site.
Conditions of Approval
I hereby approve this substitute water supply plan, in accordance with § 37 -90- 137(11),
C.R.S., subject to the following conditions:
1. This SWSP shall be valid for the period of April 1, 2012 through March 31, 2013, unless
otherwise revoked, modified, or superseded by decree. If this plan will not be made
absolute by a water court action by the plan's expiration date, a renewal request must be
submitted to this office with the statutory fee (currently $257) no later than February 15,
2013.
2. Well permit 75825 -F was obtained for the current use and exposed pond surface area of
the gravel pit in accordance with § 37 -90- 137(2) and (11), C.R.S
3. The total surface area of the groundwater exposed at the SerFer Pit must not exceed 1.00
acre during the approval period of this SWSP resulting in an annual evaporative loss of
2.45 acre -feet.
4. The total amount of water used for mining operations at the SerFer Pit during the approval
period shall not exceed 2.00 acre -feet for dust control and the total product mined shall not
.A