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2015-11-07_REVISION - M2010049
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2015-11-07_REVISION - M2010049
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Last modified
6/15/2021 2:33:17 PM
Creation date
12/9/2015 7:46:41 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M2010049
IBM Index Class Name
REVISION
Doc Date
11/7/2015
Doc Name
Application AM01
From
Varra Companies, Inc.
To
DRMS
Type & Sequence
AM1
Email Name
PSH
WHE
Media Type
D
Archive
No
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Exhibit G - Water Information <br /> '...that lining mined gravel pits has almost unmeasurable influences to the <br /> surrounding groundwater hydrology and does not change hydraulic gradients <br /> beyond the variations that would normally be expected in the geologic settings <br /> associated with the operation.' <br /> We anticipate the OMLR will concur with this analysis. Once operations near completion <br /> of any lined basin, the Colorado Department of Water Resources Office of the State <br /> Engineer (OSE) will be contacted and the lined basins will be approved prior to use. <br /> The OSE approval letter will be provided to the OMLR as a condition of the permit and <br /> satisfaction that the lined basin has met the specifications necessary to pass a liner test <br /> as part of the OSE approval process. <br /> (1) Operations will not adversely affect surface and groundwater systems. The <br /> manner and method of extraction is detailed under Exhibit D — Extraction Plan. <br /> Anticipated effects on surface flows are anticipated to be minor to none. <br /> Essentially, the flood plain covers the property and unless under flood <br /> conditions, upland overland flows are generally diverted by existing access roads <br /> or grassed drainage channels, or drain internally into existing or planned basins. <br /> (2) (a) Please refer to Exhibit C-1: Existing Conditions Map. <br /> (b) The known aquifer under the site is the stream alluvium. <br /> (c) Discharge water will be dissipated with hard surface riprap or established <br /> grassed waterways. Other waters are retained by internal pit drainage, directed <br /> by vegetated berms or established waterways or through the maintenance or <br /> establishment of a stabilizing cover of vegetation, or as otherwise established <br /> under an approved Colorado Department of Health stormwater permit and/or <br /> stormwater discharge permit. <br /> (3) The three components of the project water requirements are water removed with <br /> the product, dust control, and evaporation from exposed ground water. Dust will <br /> be controlled using truck sprinklers, and the estimated frequency is one load per <br /> day. At 2,500 gallons of truck capacity, the annual demand is 2.80 acre-feet. <br /> After the water table is encountered, the water removed with the estimated <br /> 800,000 tons of product is 23.55 acre-feet per year. The estimated net <br /> evaporation is 1.419 feet per year. At the maximum potentially exposed ground <br /> water of 62.81 acres, the annual evaporation is 89.13 acre-feet. The monthly <br /> distribution of these estimates is shown in the following table. The reclamation <br /> plan provides that the pits will be lined after being mined. The lined pits will not <br /> require replacement water and will be used for storage. There may be incidental <br /> demand for water to establish vegetation on the site after lining is completed. <br /> However, the ultimate demand for water will be zero. <br /> Varra Companies, Inc. Permit M-2010-049 2 <br /> Western Sugar Reclamation Land Development Project OMLR 112 Permit Amendment 2015 <br />
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