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PERMFILE42472
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PERMFILE42472
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Entry Properties
Last modified
8/24/2016 10:44:56 PM
Creation date
11/20/2007 11:11:27 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
X198816822
IBM Index Class Name
Permit File
Doc Date
8/8/1988
Doc Name
NOI Amendment Application
From
PEABODY COAL
To
MLRD
Media Type
D
Archive
No
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• ENVIRONMENTAL SETTING <br />The study area is located on the northern edge of the Williams Fork Mountain, just to the <br />south of Hayden, Colorado. Elevation ranges from just less than 6800 feet to just over <br />7800 feet and slopes generally from southeast to northwest. The area can be charac- <br />terized as one of high relief, from big sage covered alluvial floors to scrub oak covered <br />ridgetops. Drainage is generally southeast to northwest, by many small, seasonal drain- <br />ages running into Hubberson Gulch and then Dry Creek and ultimately, The Yampa River. <br />The area is underlain by the Williams Fork Formation, Upper Cretaceous in age, consist- <br />ing of sandstone, shale, and coal. Soils will not be discussed in detail, see Tab 9, Soil <br />Survey for information on the Seneca II-W soils. The soil scientists told the field crew <br />That the alluviation rate was quite rapid (surface deposits 5-10 years in age), that ridge- <br />tops were quite stable, with soil development about 24 inches and 10-100,000 years old, <br />and that a talus slope could be quite stable for the 10-100,000 year time range.) <br />• The climate of western Colorado can be characterized as highland, with generally cool <br />~ ~ temperatures (Berry 1968). Topography is the most complex factor in mountain climates, <br />with western and southern slopes being generally warmer than eastern and northern <br />slopes (Armstrong 1972). Craig receives 15.51 inches of precipitation per year, while <br />Steamboat Springs receives 23.67 inches (U.S. Weather Bureau 1964). The annual precipi- <br />tation for Hayden which is the closest station to Seneca II-W is 16.1 I inches per year. <br />The average annual Temperature is 41.9°F for Hayden (Climatological Data; Annual Sum- <br />mary; Colorado 1980). See Tab 8, Climatology, for more information. <br />Vegetation varies with the elevation and topography of the study area. Alluvial bottoms <br />and the lower south to west facing slopes contain the sagebrush grassland community, <br />with wheatgrasses, native and introduced bluegrass species, needlegrasses, and a variety <br />of fortis as component species. Basin big sage occurs in the lower elevations and alluvial <br />areas while mountain big sage occurs at higher elevations. The mountain shrub com- <br />munity is found on steep slopes and ridgetops at generally higher elevations. Choke- <br />cherry, mountain mahogany, serviceberry, Gambel's oak, and snowberry are found in this <br />community. Aspen stands are occasionally found on north to northwest facing slopes, and <br />• in drainage bottoms of the eastern to southeastern side of the study area, where eleva- <br />tion is somewhat higher than the western area. <br />5-3 <br />
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