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APPCOR10897
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Last modified
8/24/2016 6:31:27 PM
Creation date
11/19/2007 2:14:31 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981053
IBM Index Class Name
Application Correspondence
Doc Date
9/28/1988
Doc Name
BLUE FLAME MINE PERMIT CORRESPONDENCE FN C-81-053
From
MLRD
To
ROBERT LOBATO
Media Type
D
Archive
No
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VIII. Alluvial Valley d oors - Rules 2.06.8, 2.07.6(2)(k) and 4.24. <br />The Hay Gulch area has previously been documented (see National King Coal, <br />Inc., findings, February 4, 1982) to be an Alluvial Valley Floor (AYF) and for <br />the purposes of this findings document is considered to be an AVF. <br />Field observations by Division staff and information contained in other permit <br />applications indicate that small areas of unconsolidated stream-laid materials <br />are present in adjacent drainages. However, these areas are not extensive <br />enough to meet the size criteria of AVF's. <br />It has been determined that Hay Gulch meets the criteria for an Alluvial <br />Valley Floor based upon the following: (1) The valley contains unconsolidated <br />stream-laid deposits; (2) The valley contains sufficient water to support <br />agricultural activities as evidenced by (a) The historical use of flood <br />irrigation in the area, (b) The demonstrated capability of the area to be <br />flood irrigated, and; (3) The demonstrated subirrigation of the area. <br />It should be noted that Hay Gulch does not presently contain a stream. It is <br />thought by the Division, however, that this is due to agricultural practices <br />which divert naturally occurring flow into the Hay Gulch Ditch. Furthermore, <br />it is thought that the original channel has been removed by local agricultural <br />activities. <br />The Hay Gulch irrigation ditch, which parallels La Plata County Road 120, is <br />used for flood irrigation purposes in the vicinity of the Blue Flame Coal <br />Mine. Furthermore, it has been demonstrated that the naturally occurring <br />water table of the AVF varies from above ground surface to about three feet <br />below the surface (see Section V of this document). This demonstrates that <br />sufficient water is available for subirrigation purposes. Furthermore, the <br />identified land use on the AVF is primarily pasture land with occasional hay <br />production. The essential hydrologic functions that supply water to the AVF <br />are both flood irrigation and subirrigation as described above. The applicant <br />has not presented any information regarding the significance of the AYF to the <br />individual farming units; therefore, the AYF must be considered significant <br />far purposes of this findings document. <br />The potential for impact to the AVF from the Blue Flame Loal Mine is minimal. <br />Two potential impacts have, however, been identified: <br />1) It is possible that water which has collected in the sediment <br />pond could infiltrate into the AVF near the mine site. Tne <br />potential for this leachate to adversely affect the AVF is small <br />due to the potential for dilution within the AVF (see Se=tion V <br />of this document). Furthermore, it is much more likely that the <br />Hay Gulch AVF would contribute water to the material in which the <br />pond is to be constructed rather than that material contributing <br />water to the unconfined alluvial aquifer. <br />-11- <br />
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