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2009-09-30_REVISION - M1996050
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2009-09-30_REVISION - M1996050
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Last modified
6/15/2021 2:20:34 PM
Creation date
10/1/2009 1:16:32 PM
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Template:
DRMS Permit Index
Permit No
M1996050
IBM Index Class Name
REVISION
Doc Date
9/30/2009
Doc Name
Submittal
From
Forrest Leaf, P.E.
To
DRMS
Type & Sequence
AM1
Media Type
D
Archive
No
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30 <br />SOIL SURVEY <br />of the county. It formed in calcareous, loamy materials <br />weathered from Brule Siltstone. The average annual <br />precipitation ranges from 13 to 17 inches. Slopes are <br />gently sloping to moderately sloping. <br />Included in this unit are small areas of Keota loam, 3 to <br />5 percent slopes. <br />Typically the surface layer is light brownish gray loam <br />about 3 inches thick. The underlying layer is very pale <br />brown and light gray, calcareous loam that is about 8 <br />inches thick and contains weathered fragments of silt- <br />stone. Below this is a very pale brown, calcareous Brule <br />Siltstone at a depth of 11 inches. <br />Permeability is moderate. Effective rooting depth is ' <br />to 20 inches. Available water c-,;!)acity is low. Surface ru- <br />noff is rapid, and the erosion hazard is high. <br />This soil is used almost entirely for grazing. It is not <br />suited for cultivation because of its shallow depth. Small <br />areas once used as nonirrigated cropland are now seeded <br />back to grass. <br />Rangeland vegetation on this soil consists mainly of <br />blue grama, western wheatgrass, winterfat, threadleaf <br />sedge, and sideoats grama. Proper grazing use and <br />planned grazing systems must be designed to limit <br />stocking and degree of use to maintain a protective plant <br />cover on this soil. Periodic deferment of grazing during <br />the-summer months benefits the vegetation by permitting <br />forage plants to complete growth and mature seed. <br />Mechanical rangeland treatment practices are not recom- <br />mended. Stock water is usually difficult to find in areas of <br />this soil. <br />Windbreak and environmental plantings are generally <br />.not suited to this soil because of the shallow depth. Onsite <br />investigation is needed to determine if plantings are <br />feasible. <br />Rangeland wildlife such as antelope and scaled quail <br />could best be encouraged by proper livestock grazing <br />management and installation of watering facilities. <br />Depth to bedrock is the primary limiting soil feature <br />for homesites or other urban developments. Special <br />sewage systems must be designed. Septic tank absorption <br />fields will not function properly because of the depth to <br />rock. Compensating building and road designs must be <br />utilized in order to offset the shallow bedrock condition. <br />Capability subclass VIe nonirrigated. <br />28-Fluvaquentic Haplaquolls. Fluvaquentic <br />Haplaquolls consist of deep, dark-colored, poorly drained <br />soils formed in recent alluvial deposits underlain by sand <br />and gravel at depths less than 20 inches. These nearly <br />level soils are on bottomlands along the South Platte <br />River and have a braided pattern of old meandering chan- <br />nels. They are extremely variable in texture within short <br />distances, ranging from sandy loam to clay. <br />Included are small areas of Westplain silty clay loam <br />and Alda loam. <br />These soils have a fluctuating water table during most <br />of the year and are subject to frequent flooding during <br />spring and summer months. A moderate saline condition <br />is also common. <br />These soils are used mainly for grazing (fig. 8). A few <br />small areas bordering areas of more productive soils are <br />used for irrigated cropland. These soils are best suited for <br />grazing. <br />Irrigated cropland areas require intensive management. <br />Special care is required on this soil in applying irrigation <br />water. Sprinkler irrigation is best suited, but border or <br />furrow methods can be used. Land leveling is difficult <br />because these soils may be shallow over sand and gravel. <br />Short irrigation runs and frequent light irrigations are <br />needed. Applications of manure and commercial fertilizer <br />containing nitrogen and phosphorus are important to <br />maintain fertilit%. <br />Rangeland vegetation consists mainly of alkali sacaton, <br />inland saltgrass, switchgrass, western wheatgrass, sedge, <br />and rush. Key forage grasses should be maintained by <br />proper grazing use and grazing management systems that <br />include deferment during the growing season at well- <br />timed intervals. These soils can be seeded to rangeland <br />species or adapted introduced grasses such as tall wheat- <br />grass. Fencing and livestock water developments are ef- <br />fective in obtaining more uniform distribution of grazing. <br />Windbreak and environmental plantings are generally <br />difficult to establish on these soils because of frequent <br />flooding and the high water table. Onsite investigation is <br />needed to determine feasibility of plantings and adapted <br />plants. <br />Wetland wildlife, especially waterfowl, utilize these <br />soils. The high water table allows production of wetland <br />plants that provide nesting and protective cover, as well <br />as some food for waterfowl. Because these soils provide <br />cover for wildlife and are near irrigated cropland where <br />the wildlife species obtain much of their food, they are <br />valuable for openland, wetland and rangeland wildlife. <br />Openland wildlife, especially pheasants, use these areas <br />for cover and nesting. They also provide excellent cover <br />for rangeland wildlife, especially deer. Management for <br />wildlife should include prevention of overgrazing by <br />livestock and protection from unplanned fire. Where <br />livestock are present, these valuable wildlife areas should <br />be fenced to prevent unwanted encroachment and <br />overuse. <br />Frequent flooding and a fluctuating water table at 10 <br />to 40 inches limit these soils for use as homesites or other <br />urban developments. Intensive and costly engineering <br />design and measures are needed in order to overcome <br />these limiting soil features. Capability subclass VIw <br />nonirrigated, IVw irrigated. <br />29-Fluvaquents. Fluvaquents are deep, somewhat <br />poorly drained and poorly drained soils formed in recent <br />alluvial deposits bordering the South Platte River Chan- <br />nel. They are nearly level. The area is dissected by old <br />river channels and by smaller intermittent streams. <br />This unit is extremely variable from place to place. The <br />surface layer ranges from loamy sand to clay overlying <br />sand and gravel at depths of 4 to 20 inches. <br />These soils have a fluctuating water table ranging from <br />10 to 60 inches during winter and summer months. They
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