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2010-12-27_PERMIT FILE - C1981012
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2010-12-27_PERMIT FILE - C1981012
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Last modified
8/24/2016 4:28:18 PM
Creation date
1/5/2011 3:07:29 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981012
IBM Index Class Name
Permit File
Doc Date
12/27/2010
Doc Name
GEOTECHNICAL STUDY —NEW ELK MINE SITE FACILITIES
Section_Exhibit Name
Exhibit 38 Geotechnical Study - NEM Site Facilities
Media Type
D
Archive
No
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SUMMARY OF CONCLUSIONS AND RECOMMENDATIONS <br />A geotechnical investigation was conducted at the New Elk Mine near Trinidad, <br />Colorado. The project location is shown on Figure 1 — Site Location Map. The purpose of the <br />investigation was to evaluate the surface and subsurface conditions at the site with respect to <br />foundation design and earthwork for the proposed construction. This summary has been prepared <br />to include the information required by civil engineers, structural engineers, and contractors <br />involved in the project. <br />Subsurface Conditions (n. 2) <br />The subsurface investigation consisted of seven borings at the New Elk Mine and one <br />boring at the Jansen Yard, drilled on August 5 and 6' 2010. The borings at the New Elk Mine <br />generally encountered fill materials above native clay and silt soils extending to dense gravel <br />soils. Groundwater was encountered at depths of between 8.5 and 17.0 feet. The native clay soils <br />and fill materials were determined to be moderately plastic and may have a slight potential for <br />expansion. <br />At the Jansen Yard, the boring encountered clay and shale fill above native sand and <br />gravel soils. Groundwater was not encountered at the Jansen Yard boring location. The clay and <br />shale fill materials are moderately plastic and slightly expansive. The native sand soils are non- <br />plastic and may have a slight potential for collapse. <br />• Summary of Foundation Recommendations <br />Water Tanks <br />■ Foundation Type — Spread Footings or Monolithic (Turndown) Structural Slab. (p. 4) <br />■ Structural Fill — None required for foundations on bedrock. Minimum of 24- inches <br />below foundations or extending to native gravel soils, whichever is less. Where <br />structures are not sensitive to slight movements, the existing fill materials may be <br />reused as structural fill provided wood and other organic materials removed. <br />Imported structural fill should consist of pit -run, crusher fines, CDOT Class 6 base <br />course, or other granular material approved by the engineer. (p. 4) <br />■ JVavimum Allowable Bew-ing Capacity — 4,000 psf for foundations on rock. 1,500 <br />psf for foundations above structural fill. (p. 4) <br />■ Subgrade Modulus — 150 pci for existing fill materials. 250 pci for pit -run, crusher <br />fines, or CDOT Class 6 base course. (p. 4) <br />Pinup Station <br />• Foundation Type — Monolithic (Turndown) Structural Slab. (p. 5) <br />• Structural Fill — Minimum of 36- inches below foundations. The existing fill <br />materials are not suitable for reuse as structural fill. Imported structural fill should <br />consist of pit-run, crusher fines, CDOT Class 6 base course, or other granular <br />material approved by the engineer. (p. 5) <br />• Alavinurm Allowable Bearing Capacity-1,500 psf. (P-5) <br />• Subgrade Moduhus — 250 pci for pit -run, crusher fines, or CDOT Class 6 base course. <br />(p• 5) <br />• <br />
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