2023-07-14_PERMIT FILE - C1981010 ‎(16)‎

• Permit No: C1981010
• IBM Index Class Name: Permit File
• Doc Date: 7/14/2023
• Doc Name: Summary of Geotechnical Design andf Operational Cnsiderations for Highwall Mining-I,J,N, and L Pits
• Section_Exhibit Name: Appendix X
• Media Type: D
• Archive: No

January 2, 2020 Page 2-4
Agapito Associates, Inc.
barricade HWM holes to unintentional access; however, these berms do not normally achieve an
airtight seal. While the design curves presented in this report are intended to lower the risk of
subsidence to acceptable levels, the risk cannot be entirely eliminated, and Trapper should be
aware that associated spontaneous combustion is a risk as well.