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2000-02-10_GENERAL DOCUMENTS - C1981041
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2000-02-10_GENERAL DOCUMENTS - C1981041
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Last modified
3/26/2021 5:46:02 PM
Creation date
11/23/2007 11:21:33 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981041
IBM Index Class Name
General Documents
Doc Date
2/10/2000
Doc Name
Proposed Decision and Findings of Compliance for RN3
Permit Index Doc Type
FINDINGS
Media Type
D
Archive
No
Tags
DRMS Re-OCR
Description:
Signifies Re-OCR Process Performed
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On the east side of the river, the Roadside Mine will undermine two additional canyons: Rapid Creek and <br /> Cottonwood Creek. Both creeks are intermittent during most years, but do Flow continuously during wet years. <br /> Flows in these creeks occur primarily in response to annual snowmelt and seasonal precipitation events. <br /> Intake structures are present in both Rapid Creek and Cottonwood Creek to divert water from those drainages <br /> into reservoirs for later release which, along with water from other storage structures, can artificially increase <br /> the duration of stream Flows. Several small unnamed drainages(washes)on the east side of the river will also <br /> be impacted by mining, either through surface disturbance or through undermining. <br /> The only other major surface water body within the permit area is the federally owned Highline Canal. This <br /> canal carries river water down the west side of DeBeque Canyon of the Colorado River, with siphons under <br /> the channels of Coal and Jerry Creeks. The Highline Canal is primarily used for agricultural purposes in the <br /> Grand Valley. <br /> Soils <br /> Soils in the general area are commonly high in sodium and,occasionally,saline. Soil mapping units identified <br /> within and adjacent to surface disturbed areas are Torriorthents-Warm Rock Outcrop Complex, Wrayha- <br /> Veatch-Rabbitex Complex, Barx-Clapper Complex,Cameo, Fluvaquents, and Uffens Loam. These consist <br /> primarily of gravelly to stony loams,often calcareous,with slight to moderate alkalinity. All tend to have low <br /> available water capacity,due to the stony to cobbly textures. Occasional clay loams are found with high water <br /> capacity. The stoniness limits their successful utilization. Low organic matter content and elevated SAR <br /> values also limit vegetative growth on soils in the area. <br /> Variability of the characteristics of the soils on the permit area is primarily due to slope and topography. The <br /> depth of the soils range from I inch to greater than 60 inches,with the shallower soils of 0 to 40 inches along <br /> the side slopes of the canyons and the deeper soils located in the valley floors. The deeper soils tend toward <br /> the sandy foams while the shallower soils tend to be stony loams. <br /> Further information on soils can be found in Tab 9 of the permit application document. <br /> Climatology <br /> The permit area receives less than nine inches of precipitation annually and is characterized by moderately cold <br /> winters and warm summers. Average temperatures range between 270F in the winter and 79oF in the summer, <br /> with relatively even distribution of precipitation during the year. <br /> The average speed and direction of the prevailing winds in the permit area is 8.0 mph from the southwest. <br /> Vegetation <br /> The mesas and the valley slopes at the canyon base support sparse salt desert vegetation, including grasses such <br /> as galleta Hilaria ' mesii), indian ricegrass O zo sis hvmenoides)and squirrel tail Sitanion h strix)and <br /> shrubs such as winterfat (Ceratoides lanata), shadscale (Atriplex confertifolia), big sagebrush Artemisia <br /> tridentata) and fourwing saltbrush (Atrivlex canescens). The riparian zone adjacent to the Colorado River <br /> supports a variety of grasses,shrubs and trees, including willows Salix gip.),cottonwoods Po ulus spp.),salt <br /> cedar(Tamarix arviflora ,and bluegrass(Poa spp). <br /> Further information on vegetation can be found in Tab 10 of the permit application. <br /> 15 <br />
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