2009-11-20_PERMIT FILE - M2009064

Home Browse Search

EXHIBIT D MINING PLAN (CONT.) in this area, Grand County will contact the Division and submit a revised bond estimate for removal of the foundation and any permanent features of the building. GEOLOGIC SETTING The material to be mined is a terrace deposit of upper Pleistocene aged, Younger gravel bearing terrace alluvium (yg). It is deposited on benches or broad terraces of gravel that run approximately northwest to southeast in this part of the county. The thickness of the mineral deposit varies from 60 to 100+ feet and averages depth to be removed on this mine is approximately 70 feet deep. This site has a thin layer of topsoil, zero to 15 inches, consisting of a sandy silt, overlaying an overburden that varies from 8 to 20 feet deep. This alluvium is a well-sorted course gravel, sand and silt, predominantly granitic and quartz- ite material with minor amounts of gneiss, schist and sandstone. SOILS AND OVERBURDEN The SOILS MAP in EXHIBIT 1 shows the soil types as delineated by the National Resource Conservation Service (NRCS) obtained from the internet. The information contained in Exhibit I/J will provide background levels for the site as reclamation begins on the entire area. There are four types of soils found on the site. These soils, are typical throughout Grand County. They have no unusual qualities. The four types of natural soils on the parcel deter- mined by the Natural Resource Conservation Service as shown in the report are designated as map Units 39, 46, 83, and 93. See the soils map in the NRCS report for how the soils are distrib- uted on the permit area. More detail information including, the soils description and engineering qualities, can be found start- ing on page 24 in this application. Unit 3 9, Harsha Loam - 15 to 50% slopes, covers approximately 8.96 ac.± or 9.67% of the permit area. It lies along the steep slopes along both sides of the ephemeral drainage. This soil is described as a deep, well drained soils formed in alluvial sediments derived principally from sedimentary rock. It is a dark grayish brown loam with the surface layer averaging 5 inches. This soil type falls in the capability subclass VIIe nonirrigated'and ecological site classification as Dry Exposure. Unit 46, Leavitt Loam - 6 to 15% slopes covers 0. 06 acres ± or 0.70% of the permitted area. This soil crosses the very south- west corner of the permit area. The soil is a well-drained dark gray loam averaging 7 inches deep in Grand County. None of this soil will be affected by mining. It falls in the capability subclass VIe nonirrigated and ecological site classification is Mountain Loam. Unit 83, Tine cobbly sandy loam -15 to 55% slopes covers 17.44 acres; ± or 18.8% of the permitted area. The soil is a deep, some what excessively drained dark grayish brown deposit varying from 5 to 15 inches deep. According to the NRCS report, has a high 7 (revised 9/23/09)