2021-07-21_PERMIT FILE - C1981019 ‎(5)‎

• Permit No: C1981019
• IBM Index Class Name: Permit File
• Doc Date: 7/21/2021
• Doc Name: Point of Compliance Well Investigation Report
• Section_Exhibit Name: Exhibit 07 Item19 Point of Compliance Well Investigation Report
• Media Type: D
• Archive: No

Point of Compliance Well Investigation

AECOM
ii

Figures
Figure 1 Colowyo Mine Monitoring Well Network
Figure 2 Colowyo Mine Temporary Monitoring Wells, Dissolved Arsenic Statistics
Figure 3 Colowyo Mine Temporary Monitoring Wells, Field pH Statistics
Figure 4 Colowyo Mine Temporary Monitoring Wells, Dissolved Iron Statistics (Regulation
41 Comparison)
Figure 5 Colowyo Mine Temporary Monitoring Wells, Dissolved Iron Statistics (Upgradient
Background)
Figure 6 Colowyo Mine Temporary Monitoring Wells, Dissolved Manganese Statistics
(Regulation 41 Comparison)
Figure 7a Colowyo Mine Temporary Monitoring Wells, Dissolved Manganese Statistics
(Upgradient Background)
Figure 7b Colowyo Mine Temporary Monitoring Wells, Dissolved Manganese Statistics
(Pre-1994 Background)
Figure 8 Colowyo Mine Temporary Monitoring Wells, Nitrite (as N) Statistics
Figure 9 Colowyo Mine Temporary Monitoring Wells, Dissolved Selenium Statistics
Figure 10 Colowyo Mine Temporary Monitoring Wells, Sulfate Statistics (Regulation 41
Comparison)
Figure 11a Colowyo Mine Temporary Monitoring Wells, Sulfate Statistics (Upgradient
Background)
Figure 11b Colowyo Mine Temporary Monitoring Wells, Sulfate Statistics (Pre-1994
Background)
Figure 12a Colowyo Mine Temporary Monitoring Wells, Total Dissolved Solids Statistics
(Regulation 41 Comparison)
Figure 12b Colowyo Mine Temporary Monitoring Wells, Total Dissolved Solids Statistics (Pre-
1994 Background)
Figure 13 Colowyo Mine Proposed Point of Compliance Well Locations
Appendices
Appendix A Temporary Monitoring Well Construction Reports
Appendix B October 2019 Well Development and Sampling Forms
Appendix C Temporary Monitoring Well Abandonment Forms