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2010-04-29_REVISION - M1980178
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2010-04-29_REVISION - M1980178
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Entry Properties
Last modified
6/15/2021 5:55:56 PM
Creation date
5/20/2010 3:33:01 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1980178
IBM Index Class Name
REVISION
Doc Date
4/29/2010
Doc Name
Response to PAR
From
TAL
To
DRMS
Type & Sequence
CN1
Email Name
THM
Media Type
D
Archive
No
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<br />p % Huddleston-Berry <br />?;c2 Engineering & Testing, LLC <br />Moores Mining, LLC <br />32906 Highway 141 <br />Gateway, Colorado 81522 <br />Attention: Leon Moores <br />Subject: Moores Pit <br />Response to Comments <br />640 while Avenue <br />Grand Junction, CO 81501 <br />Phone: 970-255-8005 <br />Fax: 970-255-6818 <br />HuddlestonBerry@bresnan.net <br />www.HBET-GJ.coni <br />April 28, 2010 <br />Project#00966-0001 <br />Reference: Geotechnical Review, Moores Mining, LLC, kfoores Pit, Conversion Revision <br />CN-01, Permit No. M-1980-178, by the State of Colorado Division of <br />Reclamation, Mining, and Safety. <br />Dear Mr. Moores, <br />At your request, Huddleston-Berry Engineering & Testing, LLC (HBET) prepared the following <br />responses to comments by the State of Colorado regarding the Moores Pit in Gateway, Colorado. <br />Comment: The stability analyses provided for the slope dotivn to the highway are for <br />unsaturated conditions tivithin the main body of materials that make tip the slope. Worst case <br />conditions for stability may occur tivhen the detention ponds are frill, and seepage from the ponds <br />infiltrates the slope materials. This is particularly the case is seepage were to pool at a less <br />permeable interface i0thin the slope, such as may be caused by the stoney clay loam layer. The <br />Operator mist provide and evaluation of the potential for seepage from the ponds to destabilize <br />the slope. <br />Response: In general, HBET does not believe that seepage forces will be a concern at this <br />site and as-such were not considered in the analyses. This is primarily due to the fact that the <br />existing gravel soils are highly permeable. As a result, HBET does not believe that excess pore <br />water pressures will develop in the gravels. <br />In addition to the high permeability of the native gravel soils, .the bottom -of the larger pond <br />(Pond 1) is only fifteen feet above the flowline of the culvert under Highway 141. As a result, <br />the full pond elevation is only a few feet above the highway. In addition, Pond 1 is not located in <br />an area where steep slopes exist along Highway 141. Therefore, Pond 1 is not anticipated to <br />have any impact on Highway 141.
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