2012-01-23_HYDROLOGY - M1977439

• Permit No: M1977439
• IBM Index Class Name: HYDROLOGY
• Doc Date: 1/23/2012
• Doc Name: Combined SWSP
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: ECS
• Media Type: D
• Archive: No

Site Name
Evaporation
Losses
(ac -ft)
Lost in
Product
(ac -ft)
Dust
Control
(ac -ft)
Total
(ac -ft)
Total
Lagged
Stream
Depletions
(ac -ft)
Home Office Pit
32.04
0.00
2.00
34.04
33.72
Overland Ponds
Site
23.06
14.72
2.00
39.78
38.92
North Taft Hill
Expansion Site
4.69
0.00
0.00
4.69
4.70
Total
59.79
14.72
4.00
78.51
77.34
Mr. Jared Dains
Lafarge Upper Poudre Combined SWSP
January 11, 2012
City of Greeley ( "Partners ") through a separate SWSP for the Home Office Pit (WDID 0302556)
and are removed from this SWSP. The exposed surface area at the Overland Ponds is from the
dewatering trenches around the pit which total to 11.3 acres based on estimated width of 10 feet.
According to the information provided the current exposed surface area at the North Taft Hill
Expansion site continues to be 2.3 acres.
During the term of this plan, the only consumptive use at the Home Office Pit is the
evaporation of exposed ground water and water pumped for dust control. The North Taft Hill
Expansion Site consumptive use will only be from evaporation of exposed ground water. The
consumptive use at the Overland Ponds Site will be from water lost with mined product, from dust
control, and from evaporation of exposed ground water.
Depletions
The total losses for the sites are shown in the following table:
TABLE B - DEPLETIONS
Page 2
The estimate of evaporative losses under this combined plan was reduced during the ice
covered period. You have assumed the ice covered period occurs from December through
February, based on the average temperatures of 29 °F for December, 27 °F for January and 31 °F
for February; taken from the Fort Collins weather station (053005) using available data through
2005. The ice covered periods may be used to reduce the amount of evaporative losses that need
to be replaced; however, for the purpose of this SWSP, the Applicant shall replace the net
evaporation depletions from the exposed ground water surface area that may occur during the
assumed ice covered period (December through February) for any time that the pits are not
completely covered by ice.
Computation of the net evaporation during any time that the pits are not completely
covered by ice shall be determined as the pro -rata amount of the monthly gross evaporation rate
distribution amount identified in the State Engineer's General Guidelines for Substitute Supply
Plans for Sand and Gravel Pits, subtracting the pro -rata amount of the effective precipitation for
that period.
Pursuant to § 37- 90- 137(11)(b), C.R.S. and 2009CW49, a gravel pit operator or property owner
does not need to replace depletions that occur due to evaporation from ground water exposed prior to
January 1, 1981 (Pre -81) as a result of open mining of sand and gravel, regardless of whether mining
continued after December 31, 1980 (Post -80). This SWSP recognizes a total of 100.0 acres at the