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2014-01-31_REPORT - C1980007
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2014-01-31_REPORT - C1980007
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Last modified
8/24/2016 5:39:27 PM
Creation date
2/4/2014 12:34:58 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
1/31/2014
Doc Name
Fall 2013 Subsidence Monitoring Report
From
Wright Water Engineers, Inc
To
DRMS
Permit Index Doc Type
Subsidence Report
Email Name
JRS
DIH
Media Type
D
Archive
No
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Fall 2013 Subsidence and Geologic Field Observations <br />South of Divide and Dry Fork Mining Areas (E -Seam) <br />subsidence - related features and the several sub - parallel cracks observed in fall 2013 along the road <br />leading to the MDW E4 -12 pad were no longer visible. <br />Obvious subsidence cracks were noted in the vicinity of the access road to MDW E4 -14 as it <br />climbed out of the Dry Fork drainage to the west (Location 1). This area was nearly above the <br />active longwall mining face at the time of our field visit. Additional subsidence cracks were noted <br />in the access road to MDW E4 -11 across Dry Fork from the MDWE4 -12 pad (Location 2) and in <br />the cut -slope above the access road where it meets the MDW E4 -11 pad (Location 3). Details <br />about these observations are provided below. <br />3.7.1 Location 1 <br />Location 1 is in the vicinity of the access road to MDW E4 -14 (Map 1). Numerous subsidence <br />cracks were noted in this area both crossing the access roads to this pad, along the west side of the <br />road leading to MDW E4 -13 prior to the turnoff to MDW E4 -14, and on the hillside to the west of <br />the MDW E4 -14 access road. Two of these cracks were large enough to block travel to the MDW <br />E4 -14 well pad itself (Figure 8a and 8b) with a maximum width and depth of 18 inches and 36 <br />inches, respectively. The orientation of both cracks was approximately NPE. Both cracks could <br />be followed discontinuously to the south onto the hillside with a similar general orientation <br />between the access road and the MDW E4 -14 pad for a distance of about 200 feet. <br />831 - 032.795 Wright Water Engineers, Inc. Page 12 <br />January 2014 <br />
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