2010-05-20_HYDROLOGY - M1978052

• Permit No: M1978052
• IBM Index Class Name: HYDROLOGY
• Doc Date: 5/20/2010
• Doc Name: Combined Replacement Plan- Amendment
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: DB2
• Media Type: D
• Archive: No

Sira W. Sartori Page 2
May 17, 2010
September 5.0 59.9 64.9
October 5.0 0.0 5.0
TOTAL 33 167 200
The water pumped for dust control is considered to be 100% consumptive, thus the
consumptive use for dust control is 33 acre-feet. For the purpose of this SWSP a 4% moisture loss
was calculated to account for the resulting moisture content of aggregate. The estimate of the total
moisture losses was based upon the projected washing schedule associated with the projected
aggregate sales. The consumptive use for the washing is 30.4 acre-feet (Appendix A). Return flows
from the aggregates washing is delivered back to a settling pond on the Riverbend East site. The
evaporation from the settling pond is accounted for in the original SWSP approved on October 27,
2009. The total lagged depletions from April 2010 through October 2010 are 69.5 acre-feet.
The lagged mining depletions for the combined SWSP are shown on attached Table 1.
Replacements
The proposed source of replacement water is fully consumable water leased from the City of
Aurora. The Applicant has an agreement with the City of Aurora ("Aurora") whereby Aurora will
continue to make releases of reusable effluent up to a maximum volume of 249 acre-feet for the
Lafarge SWSPs. The applicant will account for a transit loss of 0.5% per mile from the Metropolitan
Waste Water Treatment Plant to the gravel pit sites. The transit losses for each site are shown in the
table below. For purposes of the SWSP request, an average 5% transit loss was used, which is
conservative given the estimated depletions at each site.
Point of
Replacement Distance From
Replacement Source mi Transit Loss From Replacement Source
Howe Pit 7 3.5%
Mann Lakes 8 4%
Ft. Lupton Pit 19 9.5%
Lupton Lakes 14 7%
The total lagged mining depletions and replacements are shown on attached Table no. 2.
Conditions of Approval
I hereby approve this substitute water supply plan, in accordance with Section 37-90-137(11),
C.R.S., subject to the following conditions:
1. All conditions listed in the original SWSP approved for the Lafarge South Platte Combined
SWSP on October 27, 2009 remain in effect except as modified herein. A copy of the original
approval is attached for your reference. This amendment does not alter the approval period of
this plan, which is April 1, 2010 through October 31, 2010 unless otherwise revoked or modified.
If this plan will not be made absolute by a water court action by the plan's expiration date, a
renewal request must be submitted to this office with the statutory fee (currently $257/pit) for
each gravel pit no later than August 31, 2010.
2. A well permit for industrial use must be obtained for well nos. 1657-RR, 2819-F, 19944-FR,
20317-R and 20583-R in accordance with §37-90-137(2). The provisions of §37-90-137(2)
prohibit the issuance of a permit for a well to be located within 600 feet of any existing well,
unless the State Engineer finds that circumstances so warrant after a hearing in accordance