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PERMFILE54775
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PERMFILE54775
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Entry Properties
Last modified
8/24/2016 10:57:47 PM
Creation date
11/20/2007 4:19:27 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981018
IBM Index Class Name
Permit File
Doc Date
5/13/2002
Doc Name
Surface Operations on or Adjacent to Alluvial Valley Floors
Section_Exhibit Name
SECTION II.D ALLUVIAL VALLEY FLOOR REPORT
Media Type
D
Archive
No
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• poor to prevent subirrigation of agriculturally useful plants. <br />This conclusion is made based on the poor quality of the water <br />samples collected in the alluvium (see Attachment B in II.C) and <br />on the fact that alfalfa, which is considered a phreatophyte <br />(Robinson, 1958), requires artificial flood irrigation in the area <br />in order to maintain a productive crop. Although alfalfa has a <br />rooting depth which can commonly reach beyond 11.5 feet (Robinson, <br />1958), its moderate sensitivity to salinity (Maas and Hoffman, 1977) <br />minimizes its use of subsurface water in the area. <br />c. Alluvial Valley Floor Identification <br />Because the valley near the Deserado Mine occupied by the White <br />• River is underlain by unconsolidated streamlaid deposits and <br />floor irrigation currently takes place, this area can be classified <br />as an alluvial valley floor. It should be noted that subirrigation <br />of agriculturally useful species is lacking and cannot be expected <br />in the future due to the poor quality of water in the alluvium <br />relative to the salt tolerance of deep-rooted, agriculturally <br />useful vegetation. <br />d. Effect of Mining <br />Surface Disturbances <br />As noted previously, surface disturbances on the White River <br />alluvium associated with the proposed Deserado Mine will consist <br />of relocating the county road and installing a water supply pipeline <br />• from the alluvial well field west to the west portal area and <br />4/81 II.D-20 <br />
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