2012-04-30_HYDROLOGY - M1986015

• Permit No: M1986015
• IBM Index Class Name: HYDROLOGY
• Doc Date: 4/30/2012
• Doc Name: SWSP
• From: OSE
• To: Bishop-Brogden Associates, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: TC1
• Media Type: D
• Archive: No

Location
Transmissivity
(gpd /ft)
Specific Yield
Distance to
River (ft)
Distance to
Alluvial
Boundary (ft)
Phase 1
97,100
0.15
1,032
2,647
Phase 2
97,100
0.15
964
2,206
Phase 7
97,100
0.15
420
2,250
Month
Phase 1
Phase 2
Phase 7
1
49.15%
54.46%
76.62%
2
34.43%
36.62%
19.16%
3
11.76%
8.92%
4.22%
4
4.65%
-
-
Mr. Paul Bruss, E.I.
April 30, 2012
DEPLETIONS
Page 2
Annual site depletions consist of 44.9 acre -feet of evaporation losses, 21.4 acre -feet of
pumping for dust control, and 29.4 acre -feet of water removed in the mining product, for a total
depletion of 95.7 acre -feet for each of the plan years (February 1, 2012 — January 31, 2013 and
February 1, 2013 — January 31, 2014). The monthly distribution of the values and the lagged
effects on the Arkansas River, are detailed on your Tables 1 -4, which are attached. The lagged
depletions were calculated individually for each Phase of the operation based on the
characteristics below.
Lagging factors for each of the Phases were calculated using the Glover Method,
normalized to the number of months required for 95% of depletions to affect the river, and are
provided in the following table.
Historical phreatophyte and effective precipitation were determined to partially offset
gross evaporation at the site. The credit from historical phreatophyte consumptive use was
calculated to be 3.83 acre -feet per year from 5.6 acres of equivalent 100% canopy cover native
vegetation in Phase 1, and 4.68 acre -feet per year from 3 acres of 100% canopy cover native
vegetation in Phase 7. Effective precipitation was claimed on the remaining exposed surface
area, and was calculated as 70% of total precipitation.
REPLACEMENT
The replacement water is proposed to be from 3 sources. The first is Transit Mix's
ownership of 2.92 cfs of the Hamp -Bell ditch that historically irrigated 67 acres and is estimated
to yield 170.3 acre -feet annually in an average year and 153.9 acre -feet annually in a dry year.
The second is consumable water leased from the Pueblo Board of Water Works (PBWW).
Transit Mix currently has a lease with Pueblo that will provide 106 acre -feet of totally
consumable water annually through September 30, 2012. Transit Mix plans to extend the lease
through January 2014. The third is 32.88 ac -feet (of the 65.88 acre -feet from 60 shares) from
Transit Mix's owner ship of Twin Lakes Reservoir water.
The excess credits from the Hamp -Bell Ditch water rights were changed in Case No.
03CW8 to commercial and augmentation uses. Depletions at the site that cannot be covered
by ditch credits, and depletions caused by elimination of return flows due to dry -up under the