2010-02-24_HYDROLOGY - M2002120

• Permit No: M2002120
• IBM Index Class Name: HYDROLOGY
• Doc Date: 2/24/2010
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Civil Resources, LLC
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

i
Table 1
Bernhardt Pit
Evaporative and Operational Losses
Percent of Gross Average Effective Net Net Water Surface
Month Annual Evaporation Precipitation Precipitation Evaporation Evaporation for
Evaporation 6.23
(inches) (inches) (inches)
- (inches) (acre-feel)
[1j [2] fat [4] 151 (6]
January 3.0% 1.32 0.40 0.28 1.03 0.54
February 3.5% 1.53 0.39 0.28 1.26 0.65
March 5.5% 2.41 1.10 0.77 1.65 0.85
April 9.0% 3.95 1.60 1.12 2.82 1.47
May 12.0% 5.26 2.51 1.76 3.50 1.82
June 14.5% 6.36 1.68 1.18 5.18 2.69
July 15.0% 6.58 1.11 0.77 5.80 3.01
August 13.5% 5.92 1.24 0.87 5.05 2.62
September 10.0% 4.39 1.24 0.87 3.51 1.82
October 7.0% 3.07 0.85 0.59 2.48 1.29
November 4.0% 1.75 0.68 0.47 1.28 0.67
December 3.0% 1.32 0.47 0.33 0.99 0.51
Total 100.0% 43.86 13.27 9.29 34.57 17.94
Percent of Amount of Water Lost Percent of Amount of Water Used^ Water Used Total
Month Annual Aggregate With Mined Annual Concrete in Concrete for Dust Evaporative
Aggregate Production Aggregate & Concrete Production Batching Control' & Operational
Production Production Losses
(tons) (acre-feet) (cubic yards) .(acre-feet) (acre-feet)- (acre-feet)
)
[7) [8] 191 [ 01 [1l] (12
1 [13] [14]

January 0.0% 0 0.00 0.0% 0 0.00 0.00 0.54
February - 0.0% 0 0.00 0.0% 0 0.00 0.00 0.65
March 0.0% 0 0.00 5.5% 550 0.07 0.37 1.29
April 10.4% 0 0.00 9.0% 900 0.11 0.37 1.95
May 14.4% 0 0.00 13.0% 1,300 0.16 0.37 2.35
June 17.9% 0 0.00 16.5% 1,650 0.20 0.37 3.26
July 19.4% 0 0.00 18.0% 1,800 0.22 0.37 3.60
August 16.4% 0 0.00 15.0% 1,500 0.18 0.37 3.17
September 12.4% 0 0.00 11.0% 1,100 0.14 0.37 2.33
October 9.4% 0 0.00 8.0% 800 0.10 0.37 1.76
November 0.0% 0 0.00 4.0% 400 0.05 0.37 1.09
December 0.0% 0 0.00 0.0% 0 0.00 0.00 0.51
Total 100.0% 0 0.00 100.0% 10,000 1.23 3.33 22.50
Notes:
[l] From SB 120, the evaporation percentages are for gravel pits with elevations below 6,500 feet.
(2] Equals Percent of Annual Evaporation times 29.05 inches. '
[3) From Colorado Slate University's Colorado Climate Center web page, htiptl/eoc.atmos.celoslate.edu for Longmont Weather Station.
[4] Equals Column (3) times 70 percent 70 percent value was taken from SB 120.
[5] Equals Column (2) minus Column (4). If the resultant value is less than zero then a zero is substituted.
[6] Equals Column (5) divided by 12 times 11.11 acres. Includes Pond 1(4.97 ac), Pond 2 (5.43 ac), Processing pond (0,40 ac) and dewatering trench (0.31 ac).
M Based on intonation from Hall-Irwin.
[E] Equals Column (7) times 400,000 tons per year. Production based on information from Hall-Irwin. This is production from the 22 acres mining operation.
[9] Equals Column (2) times 2000 limes 4% divided by 62.4 divided by 43,560.
(10] Based on information from Hall-Irwin.
till Equals Column (10) times 100,000 cy per year. Production based on information from Hall-Irwin.
[12] Equals Column (11) times 40 gallons divided by 325851. Assume a use of 40 gallons per cubic yard of concrete production.
[f3] Equals 6000 gallons per day times number of operating days (20 days) In the month divided by 325a51, during production months (March thm November).
[14j Equals Column (6) plus Column (9).
BERN_SWSP2010.xis Civil Resources, LLC, 12/5/2009