2025-08-08_PERMIT FILE - C1994082

• Permit No: C1994082
• IBM Index Class Name: Permit File
• Doc Date: 8/8/2025
• Section_Exhibit Name: Tab 15 Hydrologic Monitoring Program
• Media Type: D
• Archive: No

TR-54 Revised 3/25 i
TAB 15
Table of Contents
Page
Introduction 1
Baseline Hydrologic Monitoring Program 1
Operational Hydrologic Monitoring Program 12
Water Monitoring Techniques 12
Site Descriptions 22
Surface Water 22
Ground Water 22
Monitoring Frequencies 22
Ground Water 23
Surface Water 23
Springs 23
NPDES Sites 29
Hydrologic Monitor Program Revisions 29
Technical Revision 16 (2001) 29
Technical Revision 22 (2002) 29
Technical Revision 28 (2005) 29
Technical Revision 34 (2007) 30
Technical Revision 39 (2009) 31
Technical Revision 47 (2010) 31
Technical Revision 54 (2025) 32
Literature Cited 33
List of Tables
Table No. Page
15-1 Hydrologic Monitoring Site Numbering System 2
15-2 Summary of Surface Water Monitoring Sites, Yoast Mine 4
15-3 Summary of Ground Water Monitoring Sites, Yoast Mine 7
15-4 Ground Water Long Parameter List, Yoast Mine 13
15-4a Ground Water Short Parameter List, Yoast Mine 15
15-5 Surface Water Long Parameter List, Yoast Mine 16
15-5a Surface Water Short Parameter List, Yoast Mine 18
15-6 Water Sample Bottle and Chemical Preservative Requirements 19
15-7 Ground Water Quality Monitoring Procedures, Yoast Mine 21
15-8 Ground Water Monitoring Frequencies, Yoast Mine 26
15-9 Surface Water Monitoring Frequencies, Yoast Mine 28
15-10 Comparison of 2005-2009 Surface Water Quality to CDPHE Standards 34
15-11 Comparison of 2005-2009 Ground Water Quality to CDPHE Standards 37