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PERMFILE51924
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PERMFILE51924
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Entry Properties
Last modified
8/24/2016 10:55:53 PM
Creation date
11/20/2007 3:07:44 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M2002046
IBM Index Class Name
Permit File
Doc Date
3/26/2002
Doc Name
Permit Application
From
Ephemeral Resources LLC
To
DMG
Media Type
D
Archive
No
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2 <br />Purpose <br />The purpose of this report is to conform to Section 6.4.19 (b) of the State's , <br />requirements for permitting a gravel pit (Exhibit 1). This section requires that an <br />engineering evaluation demonstrate that the mining operation will not adversly <br />affect any valuable or permanent man-made structure within 200 feet of the <br />affected land <br />Geology, Topography. and Drainage <br />This site is located on Quaternary alluvium eroded from the Bookcliffs monocline <br />and fluvial deposition from the Colorado River. The underlying bedrock is the <br />Cretaceous Mancos Shale Formation. Drilling tests indicate that the Mancos Shale <br />is nearly 30 feet below grade at this site. The local topography is flat with a half <br />percent and greater slopes. All area drainage runs to the South, towards the <br />Colorado River. <br />Site Evaluation <br />The site is located in Grand Junction, Colorado, south of D Road between 29 Road <br />and 29 '/z Road (Exhibit 2) and extends south to the Colorado River. The aerial <br />photograph shown in Exhibit 2 shows that the land is currently used for agricultural <br />purposes. The farmhouse and accessory buildings shown in the south at the center <br />of the site is proposed to be removed. Besides those structures, the only home that <br />is near the Permit Boundary is located on the south side of D Road. This home is <br />approximatey 30' from the Permit Boundary (1-1 on Exhibit 3). Exhibit 3 and Exhibit <br />4 locate all man-made structures shown proximal to the site. Exhibit 4 details those <br />features that are found on D Road. Of primary interest to this study is the protection <br />of the home (1-1 on Exhibit 3), public utilities, and roads from a potential mined <br />slope failure: These items if damaged could present a potential threat to safety or <br />the environment and/or economic hardship. Other. features such as fences and <br />mailboxes are not of primary importance. These items could be damaged and then <br />repaired with no substantial consequence. <br />The site was drilled to the top of the Mancos Shale in ten different locations which <br />encompass the entire area of the site (Exhibits 5 - 14). The shallowest depth to the <br />Mancos Shale is found near the Colorado River in borehole #7 at 16' below grade <br />or 4581' SL. The soil log for borehole #7 shows that there is 6 '/z' of overburden <br />and 9'/i of gravel on top of the Mancos Shale. The greatest depth to the Mancos <br />Shale is found near the Colorado River in borehole #5 at 38 '/z 'below grade or <br />4569' SL. The soil log for borehole #5 shows that there is 16' of overburden and 22 <br />'/2 of gravel on top of the Mancos Shale. The logs indicate that the mining <br />operation will be deepest at the north edge of the site, near D Road and will <br />become shallower as the mining operation extends to the south. The SCS 1940 <br />Series show that the overburden soils are primarily composed of the Billings Silty <br />Clay (Exhibit 15). This exhibit indicates there are three soils located on the surface <br />of this site. The Billings Silty Clay (Bc), the Green River very fine sandy loam (Gm), <br />
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