2009-03-17_HYDROLOGY - M1977036

• Permit No: M1977036
• IBM Index Class Name: HYDROLOGY
• Doc Date: 3/17/2009
• Doc Name: Substitute Water Supply Plan
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: JLE
• Media Type: D
• Archive: No

Mr. Richard Raines
Middle Poudre Combined Plan - Lafarge West, Inc.
March 17, 2009
Page 2 of 9
Three Bells Pit M-79-191 06/17/2008 31.4 acres
all ost 1981
66.7 acres total
Weitzel Pit M-86-050 06/17/2008 57.5 acres-post 1981
9.2 acres-pre 1981
Kyger Pit M-99-088 06/17/2008 10 acres
all post 1981
Port of Entry Pit M-82-182 06/17/2008 26.9 acres
all ost 1981
Shields Mine M-06-064 11/08/2006 0.7 acres
all post 1981
The total exposed surface area at the Greeley 35th Avenue Pit is 72.3 acres. According to the
information submitted, 52 acres of water surface was exposed within the reclamation permit boundary
prior to January 1, 1981. This results in 20.3 acres of exposed surface area requiring replacement of
depletions from evaporation. Lafarge West, Inc. filed for water storage right for this site in Case no.
98CW476 and this case is currently pending. The site has been continuously dewatered at a rate of
approximately 1200 gallons per minute.
Mining at the East Rigden Pit has been completed and construction of a clay reservoir liner is in
process on the property. The total exposed surface area at this site is 23.2 acres. According to the
information submitted, 25 acres of water surface was exposed within the reclamation permit boundary
prior to January 1, 1981. Since the current exposed area is less than the area exposed prior to January
1, 1981, there is no evaporation augmentation requirement at this site, for this approval period.
However, lagged depletions from past water use total 1.24 acre-feet for this approval period. A storage
water right for the East Rigden Pit is pending in Division 1, Water Court case no. 2001 CW202.
The Three Bells Pit will include evaporation, water retained in the product and dust control.
Mining was re-started at the Three Bells Pit in February 2006 in an area of approximately 20 acres. This
site'hgs been continuously dewatered at a rate of 1,200 gallons per minute.
The Kyger Pit is an active mining site and will continue to include evaporation, water retained in
the, product and dust control. The mining operation at the Kyger Pit has continuously dewatered directly
back to the Cache la Poudre River since 2000. The estimated dewatering rate at the Kyger Pit site is
approximately 1,200 gallons per minute.
The only consumptive use at the Port of Entry Pit and Weitzel Pit sites is the evaporation of
exposed ground water. Mining is complete at the Weizel Pit site. The Port of Entry Pit site is currently
undergoing reclamation. Lafarge West, Inc. filed for a plan for augmentation for the Port of Entry Pit site
in case no. 2004CW111 and this case is currently pending. Lafarge West, Inc. also filed for a plan for
augmentation for the Weitzel Pit site in case no. 2002CW205 and this case is currently pending.
Shields Mine will include evaporation, water retained in the product and dust control. This site will
also be dewatered at a rate of 1,200 gallons per minute. Based on the information from the DRMS file,
the Shield Mine will be dewatered into the Fossil Creek Reservoir Inlet Ditch. This ditch lies directly to
the west of the Shields Mine. The discharge into the Fossil Creek Reservoir Inlet Ditch is the proposed
mitigation to address any drawdown impacts from mining in close proximity of the ditch. After subtracting
the transit losses (from the Fossil Creek Reservoir Inlet Ditch to the Fossil Creek Reservoir) the
dewatering water is measured and returned to the river from the Fossil Creek Reservoir outlet. The
releases shall be measured in a manner acceptable to the water commissioner and the division
engineer. Within 30 days of your receipt of this letter, the Applicant is required to update the