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2011-02-15_REVISION - C1980004 (2)
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2011-02-15_REVISION - C1980004 (2)
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Entry Properties
Last modified
8/24/2016 4:31:02 PM
Creation date
3/7/2011 2:06:12 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980004
IBM Index Class Name
Revision
Doc Date
2/15/2011
Doc Name
Preliminary Adequacy Review
From
DRMS
To
McClane Canyon Mining, LLC
Type & Sequence
PR2
Email Name
MPB
SB1
Media Type
D
Archive
No
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Corey Heaps <br />McClane Canyon Mining, LLC <br />February 15, 2011 <br />Page 22 <br />information was used to conclude that surface cracking will be limited to a few inches in <br />width? <br />116. Subsidence cracking of ephemeral drainages could interfere with runoff from over 2000 acres <br />of land directly and indirectly. What monitoring and/or mitigation measures are proposed for <br />potential impacts to runoff and to downstream water users? <br />117. On page 2.05 -73 under Rule 2.05.6(6)(c) Subsidence Monitoring, please be more specific about <br />when monitoring will begin, how long it will continue, the frequency of monitoring, what will <br />be monitored, when can it end, and what, if any, mitigation is proposed should monitoring <br />indicate the need. <br />118. Please correct the typo on page 2.05 -70 "both steams ". <br />119. The permit boundary is incorrect on Figure 2.1- -3 in the southern area. Please correct this <br />figure. <br />Rule 2.06.8 (3) Alluvial Valley Floor Determination <br />An Alluvial Valley Floor (AVF) report prepared by ERO Resources Corporation dated <br />December 17, 2009 is found in Volume 1 Appendix W of the Permit Revision No. 2 <br />application package. <br />A thorough investigation of the proposed coal mine waste pile south of the McClane Canyon <br />Mine surface facilities has been deemed adequate in accordance with Rule 2.06.08(3). There is <br />an appropriate combination of studies concluding a negative AVF determination by the <br />Division. <br />Nearly 95 percent of the investigation area is covered by various deposits that resulted from <br />unconsolidated runoff or slope wash, talus, and landslide deposits. Therefore, Rules <br />2.06.8(3)(c)(ii)( A and C) are met. <br />The two areas with exposed older alluvium total slightly more than one acre which is <br />considerably smaller than the smallest currently cultivated parcel along East Salt Creek (9.1 <br />acres). Therefore, these alluvial areas do not meet the regional practices criterion, as required <br />by Rule 2.06.8(3)(c)(ii)(B). <br />In summary, the Division finds that the area for the proposed coal waste pile is not an alluvial <br />valley floor and this negative finding has been reached in accordance with 2.06.8(3). <br />120. On page 2.06 -2 please remove the reference to the February 5, 2010 letter and "the Division's <br />informal opinion" and replace this discussion with our determination that the proposed new <br />disturbance associated with PR -2 is not in an alluvial valley floor. Likewise, in paragraph 3 of <br />the same page the reference to "the Division preliminarily concurs" should be removed and <br />replaced with an appropriate discussion. <br />
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