2009-08-18_HYDROLOGY - M2006080

• Permit No: M2006080
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/18/2009
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Bishop-Brogden Associates, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

RECEIVE
TABLE 3 FEB 0 9 2007
Maximum Evaporation In the Event Dewatering is Discontinued Prematurely
Loveland Ready - Mix Concrete, Inc. - Bokelman / Walters Pit

Month P1C1 Maximum
Surface Area

(acres)
1 Gross
Evaporation
Rate
(ft)
2 Total
Precipitation
Rate
(ft)
3 Effective
Precipitation
Rate
(ft)
4 Net
Evaporation
Rate
(ac-ft)
[5l
Net
Evaporation
(ac-ft)
6 Evaporation
Lagging
Pattern
(ac-ft)
[7 Lagged e'1
Evaporation
Depletion
(ac-ft)
8
September 9.40 0.33 0.13 0.09 0.24 2.23 11.66% 2.55
October 9.40 0.23 0.09 0.06 0.17 1.56 8.71% 1.90
November 9.40 0.13 0.06 0.04 0.09 0.83 7.10% 1.55
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
February 9.40 0.11 0.04 0.03 0.09 0.82 4.66% 1.02
March 9.40 0.18 0.11 0.07 0.11 1.00 5.12% 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 7.84% 1.71
June 9.40 0.47 0.17 0.12 0.36 3.35 11.11% 2.43
July 9.40 0.49 0.14 0.10 0.39 3.69 13.28% 2.90
August 9.40 0.44 0.14 0.10 0.35 3.25 13.79% 3.01
Total 3.27 1.35 0.95 2.32 21.84 100.00% 21.84
Notes:
[1] Maximum exposed surface area in the event that dewatering is discontinued prematurely.
[2] Based on NOAA Evaporation Atlas and distributed according to SEO Senate Bill 120 criteria for less than 650
[3] Based on average of 1949 to 2002. Waterdale Station (ID#8839).
[4] Effective precipitation equal to 70% of total 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 evaporation rate, [6].
[7] Based on CSU AWAS Glover Analysis; T=50000 gpd/ft, S =0.20, D = 750 ft for net evaporation resulting from P1C1, assuming steady state
conditions.
[8] [7] times the total of column [6].
LRM requests that in the event 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 the amount of water contained by the slurry wall decreases.
WATER RESOURCES
STATE ENGHMEER
H99641- Loveland Ready MWOI SSP12005 Analysi-ja
Worksheet: Table 3 Bishop-Brogden, Associates, Inc. 8:46 AM 218/2007