My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2020-03-06_REPORT - C1980007
DRMS
>
Day Forward
>
Report
>
Coal
>
C1980007
>
2020-03-06_REPORT - C1980007
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/7/2025 4:13:13 AM
Creation date
3/6/2020 12:22:40 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980007
IBM Index Class Name
Report
Doc Date
3/6/2020
Doc Name
Subsidence Monitoring Report
From
Wright Water Engineers, Inc
To
DRMS
Annual Report Year
2019
Permit Index Doc Type
Subsidence Report
Email Name
LDS
JDM
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
73
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
Fall 2019 Subsidence and Geologic Field Observations <br /> Southern Panels Mining Area <br /> Previously observed differential settlement cracks on the E8-5 MVB pad were still present but <br /> showed continued signs of weathering and healing. No new subsidence features were observed <br /> during our fall 2019 field visit. <br /> During our spring 2019 field visit,the E-seam longwall mining face was located immediately west <br /> of the E8-5 MVB pad. Observations made at the other MVB pads along the remainder of the <br /> traverse (i.e., E8-6 through E8-8) represented baseline visits because the longwall face had not <br /> passed beneath this area. Differential settlement cracks were observed along the road and on the <br /> largest fill portions of the MVB E8-6 pad (Location 3) and MVB E8-7 pad (Location 4). Also <br /> noted was a small slump on the north side of the MVB E8-8 pad that included a large boulder <br /> (Location 5). <br /> Observations made during our fall 2019 field visit at these locations found that there had been <br /> some changes on or near the pads as discussed below. The most significant observed changes <br /> were a parallel series of subsidence cracks located along the road near the fork leading to the E8- <br /> 7 and E8-8 pads (Location 6). Details associated with Locations 3 through 6 are provided below. <br /> 4.5.1 Location 3 <br /> Differential settlement cracks were observed during our spring 2019 field visit along the southern <br /> edge of the MVB E8-6 pad where the largest portion of fill had been placed during pad construction <br /> (Figure 6). These observations pre-dated longwall mining beneath the area. Observations made <br /> during the fall 2019, after longwall mining had occurred, found that the differential settlement <br /> cracks were somewhat widened and lengthened but in the same locations(Figure 7). No additional <br /> subsidence features were observed on the MVB E8-6 pad. <br /> 4.5.2 Location 4 <br /> Some differential settlement cracks were observed on the MVB E8-7 pad during our spring 2019 <br /> field visit(Figure 8) and prior to mining beneath the site (Figure 8). While still present during our <br /> fall 2019 field visit, additional cracks were observed on the pad near the MVB wellhead (Figures <br /> 9 and 10). These cracks are subsidence related as they appeared after mining had passed through <br /> the area and have an orientation perpendicular to the differential settlement cracks. The maximum <br /> dimension observed at these various crack locations was 1 inch in width and 0.5 inch in depth. <br /> 831-032.910 Wright Water Engineers, Inc. Page 17 <br /> February 2020 <br />
The URL can be used to link to this page
Your browser does not support the video tag.