Laserfiche WebLink
this unit are moderately deep and are well drained. They formed <br />in very calcareous alluvial and glacial outwash derived from <br />mixed sources. The surface layer is gravelly or cobbly loam, <br />clay loam, or sandy loam 2 to 5 inches thick. The underlying <br />material ranges from very gravelly sandy loam or cobbly sandy <br />loam to very gravelly loamy sand or cobbly loamy sand. Calcium <br />carbonate content is more than 15a. Depth to soft shale or <br />sandstone ranges from 20 to 60 inches or more. Permeability is <br />moderately rapid to rapid. Available water capacity is low. <br />Effective rooting depth is 20 to 60 inches or more. Runoff is <br />medium to rapid, and the hazard of water erosion is moderate to <br />high. The Guben portions of this map unit is deep and well <br />drained. It formed in thin eolian deposits over calcareous <br />alluvium and glacial outwash derived from mixed sources. The <br />surface layer is grayish brown loam 6 inches thick. The next <br />layer is brown loam 5 inches thick. The upper 4 inches of the <br />underlying material is pale brown gravelly loam, the next 8 <br />inches is white very gravelly loam, and the lower part to a depth <br />of 60 inches or more is mainly stratified very cobbly sandy loam <br />that is more than 15% calcium carbonate. In some areas the <br />surface layer is sandy loam that is as much as 20 % gravel and <br />cobbles. Permeability is moderate. Available water capacity is <br />low to moderate. Effective rooting depth is 60 inches or more. <br />Runoff is medium, and the hazard of water erosion is slight to <br />high. This unit is well suited as a source of roadfill and <br />gravel. The main limitations are the difficulty of reclamation, <br />steepness of slope, and droughtiness. If the soils are used as a <br />base for roads and streets, the upper part of the soils can be <br />mixed with the underlying sand and gravel to increase their <br />strength and stability. Suitable topsoil is available on this <br />site. Efforts need to be made to save all topsoil and stockpile <br />it for use during reclamation and of the site. <br />2) Vegetation - The site falls within the Rolling Loam and Stony <br />Foothills range sites. The dominate species found on this site <br />are big sagebrush, rabbit brush, cheatgrass, galleta, bluebunch <br />wheatgrass, sand drop seed, Indian ricegrass, needle and thread, <br />Nevada and Sandberg bluegrass, prairie junegrass, and bottlebrush <br />squirrel tail. The vegetative ground cover is approximately 30%. <br />The annual vegetative production is about 750 pounds/acre air dry <br />matter. <br />3) Reclamation Recommendations- The following reclamation <br />recommendations should be considered at the time the gravel pit <br />is closed, to insure a more successful revegetation of the site. <br />The site should be contoured and smoothed to slopes no <br />steeper than 2:1 and preferably flatter wherever practical. The <br />2 <br />