2024-06-25_PERMIT FILE - C1980007 ‎(6)‎

• Permit No: C1980007
• IBM Index Class Name: Permit File
• Doc Date: 6/25/2024
• Doc Name: STREAM CHANNEL PARAMETERS
• Section_Exhibit Name: Exhibit 55B Stream Channel Parameters and Changes Due to Mining-Induced Subsidence
• Media Type: D
• Archive: No

Average Lower
Reach (1)
Maximum
Negative
Maximum
Positive Minimum Maximum
3 11.1%15.5%8.3 -2.9%10.6%4.8%18.3%
29 9.7%4.8%14.7 -5.1%2.0%2.8%9.9%
32 8.5%4.0%14.3 -3.5%2.4%1.6%7.5%
35 5.3%5.6%15.2 -2.1%3.5%2.1%7.7%
36 7.1%5.9%6.5 -4.4%2.3%3.7%10.3%
37 8.3%5.4%13.4 -3.0%1.7%3.7%8.4%
39 15.9%8.6%9.2 -6.6%1.5%7.0%15.2%
41 30.0%25.3%9.2 -3.0%1.8%23.5%28.3%
(1)
(2)
(3)
This refers to the lowest reach potentially impacted by mining.
Slope range given for lowest reach potentially impacted by mining.
TABLE 4
EFFECTS OF SUBSIDENCE ON STREAM CHANNELS
Basin
Number
Pre-Mining Slope (%)Maximum Subsidence
(E-seam + B-seam)(2)
(ft)
Change in Slope Post-Mining Slope (3)
Basins 3, 36, 39, and 41 are only affected by E-seam mining.
G:\WWE\831-032\921\Engr\Exhibit 55B\
MCC_subsidence_55B_2020_Tables.xlsx\Table 4
Wright Water Engineers, Inc.
December 23, 2020
Prprd By: AWP
Chkd By: JMK