HYDRO25225

• Permit No: M2006080
• IBM Index Class Name: Hydrology
• Doc Date: 9/13/2007
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Bishop-Brogden Associates, Inc
• Media Type: D
• Archive: No

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TABLE 3 FEB ~ 9 207
Maximum Evaporation In the Event Dewatering is Discontinued Prematurely
Loveland Ready -Mix Concrete, Inc. - Bokehnan / Walters Pit
WAVER RESOURCES
STAVE ENAIWEER

onth
PICI Maximum

Surface Area
(acres)
I Gross

Evaporation
Ra[e
(ft)
2 Total

Precipitation
Rate
(ft)
3 Effective

Precipitation
Ra[e
(B)
4 Net

Evaporation
Rate
(ao-ft)
5
Net

Evaporation
(ac-ft)
6 Evapomtion

Lagging
pattern
(ac-fi)
7 Lagged eP-

Evaporation
Depletion
(ac-fQ
8
September 9.40 0.33 O.13 0.09 024 2.23 ', 1 L66% 2.55
October 9.40 0.23 0.09 0.06 O.I7 1.56 8.71°.6 1.90
November 9.40 0.13 0.06 0.04 0.09 0.83 '' 7.1096 L55
December 9.40 0.10 0.04 0.03 0.07 0.66 5.30% 1.16
January 9.40 0.10 0.04 0.03 0.07 0.68 4.84% 1.06
Febmary 9.40 0.11 0.04 0.03 0.09 0.82 ' 4.66°6 1.02
March 9.40 0.18 0.11 0.07 O.II 1.00 ', 5.12°6 1.12
April 9.40 0.29 0.16 0.11 0.18 1.73 6.59% 1.44
May 9.40 0.39 0.25 0.18 0.22 2.02 7.8496 1.71
June 9.40 0.47 O.I7 O.I2 0.36 3.35 ILI1% 2.43
July 9.40 0.49 0.14 0.10 0.39 3.69 13.28% 2.90
Au ust 9.40 0.44 0.14 0.10 0.35 3.25 13.79% 3.01
Total 3.27 1.35 0.45 2.32 21.84 100.00°.6 21.84
Notes:
[I ] Mazimum exposed surface area in the event that dewa[ering is discontinued prematurely.
[2] Based on NOAH Evapomtion AOas and distributed according to SEO Senate Bill 120 criteria for less than 650
[3] Based on average of 1949 to 2002. Waterdale Station (IDp6839).
[4] Effective precipitation equal [0 70~ of mtal precipitation, [3]. Based on guidelines of SEO Senate Bill 120.
[5] Equal to gross evaporation rate. [2], less effective precipitation rate, [4].
[6] Equal to total exposed surface area, [1], times net evaporaton rate, [6].
[7] Based on CSU A WAS Glover Analysis; T=50000 gpd/f[, S =0.20, D = 750 ft for net evaporation resulting from PI C 1, assuming steady slate
wndiuons.
[8] (7] times the total of column [6].
LRM requests that in the evem that dewatering of the Phase 1 pit is discontinued prematurely that they be able to reduce the amount of free water
surface and resulting depletion augmented as tue amount of water contained by the slurry wall decreases.
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