PERMFILE48218 - Laserfiche WebLink

Home Browse Search

~R~ ._,~R~s~~J APR 1 8 2006 Site Description Exhibit B Soils Information Division °t Minerals and Geology The Following information was obtained from United States Department of Agriculture Natural Resources Conservation Service Publication, Soil Survey of Douglas -Plateau area, Colorado, Parts of Garfield and Mesa Counties. The following soils information is made part of this application. Soil units are shown on an excerpt from the NRCS map, reproduced on page 7 following this text. The deposit of material is called the Happle Series. The series numbers of the soils is 45 and 46 in the Soil Survey of Douglas -Plateau area, Colorado, Parts of Garfield and Mesa Counties The Happle series consists of deep well drained soils on fans, toeslopes, and side slopes. These soils formed in colluvium and alluvium derived dominantly from the Green River Formation. Slope ranges from 3 to 65 percent. The typical surface layer is light gray very channery sandy loam about seven inches thick. The upper part of the substratum is very pale brown very channery sandy loam about seven inches thick. The next part is light gray very channery sandy clay loam about eighteen inches thick. The lower part of the substratum to a depth sixty inches or more is light grey extremely channery coarse sandy loam. By local observation of the site there is no major differentiation between 0-12 feet to the bed rock. The soil is very channery with more orange and less gray color to the soil. The material is dominantly channery talus from the decomposition of the cliffs. The channery material consists of approximately 70% of the material and gray soil makes up the remaining 30% of the sites composition. The deposit of interest lies on a slope that is approximately 25-35°. The vegetation is mainly sagebrush with some grasses. The site consists predominately of a talus slope. The material composition from 0-15 feet is soil with small shale fragments that increase in size as the depth approaches 15 feet. The material composition at a depth greater than 15 feet is predominately crushed shale rock with some pockets of fines and smaller fragments mixed in. Due to the nature of the site it will be used as a pull off for a private extension of Garfield County Road 211 as a place to stage equipment used for mineral resource development. The face of the slope after being mined will be re-contoured to the angle of repose stability. The pre mining slope is 3h to lv. The post mining slope is estimated to be lh to lv. NORTH CLEAR CREEK CONS7RUCIION MATERIALS MINE. CORDILLERAN COMPLIANCE SERVICES, ING E055]4 PAGE40r 21 GAANDJ~NCTION,COLOAADO