2012-03-14_HYDROLOGY - M1978210

• Permit No: M1978210
• IBM Index Class Name: HYDROLOGY
• Doc Date: 3/14/2012
• Doc Name: SWSP
• From: DWR
• To: CLEAR WATER COLUTIONS
• Email Name: PSH
• Media Type: D
• Archive: No

Location
X (ft)
W (ft)
T (gpd /ft)
S.Y.
CeII 1
1,492
13,229
169,658
0.2
CeII 2
1,154
13,665
159,979
0.2
CeII 3
492
12,600
169,069
0.2
Cell 4
587
13,181
158,008
0.2
Ms. Michelle L. Hatcher
Geisert SWSP
March 14, 2012
Page3of5
volumes of water pumped. Submitted accounting must show the meter reading numbers and
lagging of post pumping depletions must use the metered volume instead of a volume based on
an assumed flow rate.
Ground water from the pits will not be used for dust control at the site. Instead, any
water for this purpose will be provided from Weld County Dust Control Well #1 (permit no.
50426 -F, WDID 0305714), which operates under a separate SWSP (WDID 0302567).
The total consumptive use of ground water at the Geisert Pit is estimated to be 841.9
acre -feet, consisting of 26.4 acre -feet of evaporative Toss from the post -1980 exposed surface
areas, and 815.8 acre -feet of water pumped in dewatering operations.
The Geisert Pit is set back from the river and thus the depletions from the operations are
not assumed to be instantaneous. Depletions at the site were lagged to the stream using a Glover
analysis with the aquifer parameters shown below:
X — Distance from well to river, measured from the centroid of the exposed area
W — Distance from the aquifer boundary through the well to the river channel
T — Transmissivity of the alluvial aquifer between the well and the river (source: Tgrid0309 GIS layer from SPDSS)
The total lagged stream depletions from the operation of the Geisert Pit during this plan
period are 815.9acre -feet. Dewatering operations provide a credit to these depletions as the
volume dewatered is returned to the river with no beneficial use. Subtracting this accretion from
the depletions results in a total lagged stream depletion that must be replaced of 135.4 acre -
feet. See Table 8 for the monthly summary of these values.
Replacements
The source of replacement water to be used for this plan period is a lease of 138.9 acre -
feet of reusable effluent from the City of Greeley's Wastewater Treatment Plant ( "WWTP ").
Weld County has a perpetual lease with the City of Greeley for the right to use up to 300 acre -
feet per year of Greeley's reusable effluent. A copy of the lease agreement dated December 5,
2011 with the City of Greeley for 138.9 acre -feet of fully consumable effluent from the WWTP
(WDID 0302312) to be used at the Geisert Pit from April 2012 through March 2013 is attached
to this letter. Greeley's WWTP discharge point is located approximately two miles downstream
of Weld County's Geisert Pit. There are no intervening water rights within this reach, thus the
replacement water from the WWTP is sufficient to replace the pit's out -of- priority depletions. The
monthly depletions and replacement requirements are found on the attached Table 8.
Conditions of Approval
I hereby approve the proposed substitute water supply plan in accordance with C.R.S. §
37 -90- 137(11), subject to the following conditions:
1. This plan shall be valid for the period of April 1, 2012 through March 31, 2013, unless
otherwise revoked or modified. If this plan will not be made absolute by a water court