2011-11-16_HYDROLOGY - M1978052

• Permit No: M1978052
• IBM Index Class Name: HYDROLOGY
• Doc Date: 11/16/2011
• Doc Name: CRP
• From: OSE
• To: Applegate Group, Inc.
• Permit Index Doc Type: Hydrology Report
• Email Name: BMK
• Media Type: D
• Archive: No

Site Name
X (ft)
W (ft)
T (gpd /ft)
Specific Yield
0.2
Howe Pit
2,400
5,900
45,000
Riverbend West
4,500
4,700
170,000
0.2
Riverbend East
2,700
6,600
80,000
0.2
Jared Dains
November 16, 2011
assumed flow rates of either 1000 gpm or 200 gpm. This will no longer be acceptable to determine
monthly volumes pumped. A totalizing flow meter (TFM) capable of accurately recording the monthly
volume pumped must be installed by December 31, 2011.
Due to water quality issues, Lafarge uses water from five wells at the Riverbend East site for
washing material and dust control of road and stock piles. Lafarge will pump water for industrial uses
from the following wells: 1657 -RR (WDID 0208500), 2819 -FR (WDID 0208639), 19944 -RR (WDID
0205187), 20317 -RR (WDID 0207417) and 20583 -R (WDID 0205190). All of the wells are located
within the gravel permit boundary in sections 18 and 19, Township 1 North, Range 66 West, 6 P.M.
All five wells are permitted for irrigation purposes and they are included in the Ground Water
Management Subdistrict of the Central Colorado Water Conservancy District ( "Central GMS ")
augmentation plan approved by the Division 1 Water Court in case no. 2002CW335. Lafarge obtained
new well permits to cover industrial uses at these wells as follows: 70135 -F (1657 -RR), 70136 -F
(20583 -R), 70137 -F (19944 -RR), 70138 -F (20317 -RR) and 70139 -F (2819 -FR).
For the duration of this SWSP all metered use will be accounted under this plan. The water
pumped for dust control is considered to be 100% consumptive, thus the consumptive use for dust
control is 18 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 22.1 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 SWSP.
The mining sites are set back from the river, therefore, the depletions from the operations were
not assumed to be instantaneous. Operational and evaporative depletions at the site were lagged to
the stream system using a Glover analysis and the aquifer parameters shown below:
X- distance from well to river, measured from the cen o f expos a re a
W- distance from the aquifer boundary through the well to the river channel
T- transmissivity of the alluvial aquifer (in gallons per foot/day) between the well and the river
The lagged mining depletions are shown on attached Table 1.
Page 3
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 (WDID 0200700) 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 transit loss of 7% shall
be used.