2015-12-30_HYDROLOGY - M1978327

• Permit No: M1978327
• IBM Index Class Name: Hydrology
• Doc Date: 12/30/2015
• Doc Name: Substitute Water Supply Plan
• From: DNR
• To: DRMS
• Email Name: LJW
• Media Type: D
• Archive: No

Kauffman No. 1 SWSP Page 2 of 6
December 21, 2015
January 1, 2011. The applicant has provided a map showing the specific location of the pre-81 credit
(see Map 3). Because the pre-81 credit associated with the Kauffman No. 1 Pit (36.2 acres) is greater
than the current surface area of the Kauffman No. 1 Pit (34.9 acres), and the location of the currently
exposed surface area is entirely within the boundaries of the pre-81 area shown in Map 3, there are no
evaporative depletions associated with the Kauffman No. 1 Pit that require replacement under this
SWSP. Please note that the credits for the pre-81 areas are tied to the locations identified on Map 3 and
may not be re-allocated to other areas of ground water exposure within the gravel pit boundaries. Any
pre-81 area that is backfilled will lose the pre-81 exemption should it be excavated in the future.
Additionally the backfilling of a pre-81 area shall not create a credit to be used elsewhere.
Depletions
The Applicant projects using up to 5.35 acre-feet of groundwater at the site for dust control
purposes during this plan period, as shown in the attached Table 1. Dust control use is assumed to be
100% consumptive. No other use of ground water at the site is anticipated during this plan period.
The monthly depletions to the Big Thompson River due to past and projected use were lagged
from the pit site using the AWAS program developed by the IDS Group at Colorado State University.
The parameters used in the model were: a distance from the site to the river (X) which varied as
described below; a distance from the river through the site to the no flow aquifer boundary (W) of
4,000 ft; an aquifer transmissivity (T) of 50,000 gallons/ft/day; and a specific yield (S) of 0.2. The
distance from the exposed water surface area to the river (X value) varied over the years as
described in the table below.
Years X (ft) Justification
2000- 250 Distance used by Applegate Group (previous consultant) for this time
2011 period
2012 1,700 Distance from the river to the pump used to provide water to the City of
Loveland property
2013- 550 Distance from the river to the point water is being pumped for dust
2014 control purposes
2015- 1,450 Distance from the river to the point water is being pumped for dust
2016 control purposes
Kauffmann No. 1 Pit is adjacent to the Big Thompson River. Depletions impact the stream in
the E1/2 of section 20, Township 5 North, Range 68 West of the 6th P.M. The consumptive use for
years prior to 2015 and 2016 was obtained from prior SWSP submittals and records of actual dust
control at the site provided by the applicant. The lagged stream depletions due to past and
projected use at the site are estimated to total 4.54 acre-feet during this plan period, as shown on
the attached Table 3.
Replacements
Replacement water for this pit will continue to be made available throughout the year from a
lease of 65.0 acre-feet of fully consumable water from the City of Loveland ("Loveland"). A copy of
the lease is attached to this letter. This leased water is also used to replace depletions at the
Wagner/Kauffman Pit #3 (M-1999-069, WDID 0403008). A total of 0.114 acre-feet of water has been
dedicated to the Wagner/Kauffman Pit #3 SWSP (WDID 0402529) during this plan period. The
duration of the lease is from January 1, 2016 through December 31, 2018.