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APPCOR12300
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APPCOR12300
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Entry Properties
Last modified
8/24/2016 6:32:40 PM
Creation date
11/19/2007 2:29:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981034
IBM Index Class Name
Application Correspondence
Doc Date
12/28/1982
Doc Name
GRAND MESA ALLUVIAL VALLEY FLOOR FINDINGS
From
MLRD
To
DAN MATHEWS
Media Type
D
Archive
No
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.: <br />-2- <br />Flood irrigation is very prolific in these two valleys. Eleven major <br />irrigation ditches were identified in the Ward Creek valley, and six <br />major ditches were identified in the Williams Creek valley. (See Map 8 <br />of the addendum.) In addition to the main ditches identified, numerous <br />lateral ditches exist to distribute the water from the major ditches. <br />The principle source of water for these irrigation systems is the Granby <br />Ditch which transports irrigation water from reservoirs on Grand Mesa. <br />(An exact breakdown of how much water comes from each source, the <br />reservoirs or from the natural drainages has not been provided.) <br />The applicant has not provided an assessment of the capability of the <br />area for flood irrigation, since the only areas that meet the geomorphic <br />criteria were closely associated with existing flood irrigation systems. <br />The applicant has examined both vegetation infonnation and the ground <br />water studies with regard to the potential for subirrigation. The <br />vegetation survey indicates that the only vegetation species which <br />appears to take advantage of the alluvial ground water to any extend are <br />the hardwoods (which have limited agricultural signficance to the area). <br />The subirrigated hardwoods are found in areas immediately along Ward and <br />Williams Creek, the first and second terraces, and the lower fan surface <br />near the streams. The ground water data indicate that the alluvial water <br />levels are generally 10 to 15 feet below the land surface. The ground <br />water levels are highest immediately adjacent to the streams and near <br />irrigation ditches due to leakage. The capillary fringe may raise the <br />available water levels, but this was not indicated in the vegetation <br />survey. <br />Based on the information provided by the applicant, the areas designated <br />as Qaf, Qt 1, Qt 2, and Qt3 along the Ward Creek and Williams Creek valleys <br />are designated as alluvial valley floors because of flood irrigation <br />capability. <br />The applicant has indicated that the agricultural practices along the two <br />valleys are predominantly native pasture and hay for stock. There are <br />also some apple orchards in the area, and some fields in small grains <br />(e.g. wheat, oats, and barley). The applicant has provided no specific <br />information concerning the agricultural sign ifica~, of the alluvial <br />valley floor to farming. Therefore, the areas de~'t'gnated as alluvial <br />valley floor are assumed to be agriculturally signficiant, and the <br />Division will make all three alluvial valley floor findings for the Ward <br />Creek -Williams Creek alluvial valley floor. <br />Alluvial Vallev Floor Findings <br />1. The proposed mining operations would not interrupt, discontinue, or <br />preclude farming on the alluvial valley floor. The surface <br />facilities associated with the mine are located outside of the area <br />designated as alluvial valley floor. The proposed operation would <br />undermine portions of the area designated as alluvial valley floor <br />but this is not expected to affect farming activities. The <br />applicant has limited mining (the extraction ratio will be between <br />50 and 55 percent), and, therefore, no surface effects from <br />subsidence are expected. In addition, the applicant has proposed a <br />subsidence monitoring plan (Section 2.05.6(6)(f)(ii)(c) of the <br />permit application) to verify the predicted effect. <br />
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