OFFICE of SURFACE MINING
RECLAMATION and ENFORCEMENT

U.S. Department of the Interior

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Paul Clark
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2016 Kayenta Mine Complex CHIA

A CHIA is an assessment of the probable hydrologic consequences (PHC) of the proposed operation and all anticipated coal mining upon surface and groundwater systems in the cumulative impact area (CIA). The PHC is prepared by the applicant as required by 30 CFR § 780.21(f), and approved by the regulatory authority. Congress identified in the Surface Mining Coal and Reclamation Act (SMCRA) (U.S. Congress, 1977) that there is “a balance between protection of the environment and agricultural productivity and the Nation’s need for coal as an essential source of energy” (SMCRA, 1977 Sec 102(f)). The hydrologic reclamation plan required by the rules at 30 CFR § 780.21(h) recognizes that disturbances to the hydrologic balance within the permit and adjacent area should be minimized, material damage outside the permit area should be prevented, applicable Federal, Tribal, and State water quality laws should be met, and the rights of present water users protected. Additionally, 30 CFR § 816.42 states “discharges of water from areas disturbed by surface mining activities shall be made in compliance with all applicable State and Federal water quality laws and regulations and with the effluent limitations for coal mining promulgated by the United States Environmental Protection Agency (USEPA) set forth in 40 CFR part 434.” Discharges of disturbed area runoff at the Kayenta Mine Complex are conducted in accordance with the terms and conditions of National Pollutant Discharge Elimination System (NPDES) permits issued by the USEPA and certified by the Navajo Nation and Hopi Tribe under the Clean Water Act (CWA). The 2016 Kayenta Mine Complex CHIA assesses that; (1) the hydrologic monitoring program is adequate for OSMRE’s CHIA, (2) assesses if impacts within the permit area have been minimized, and (3) that the operation and reclamation plans are designed to prevent material damage outside the permit area. This 2016 Kayenta Mine Complex CHIA supersedes the previous Black Mesa Kayenta Mine Complex CHIA’s (OSMRE, 2011), (OSMRE, 2008), (OSMRE, 1989).

Title Size
2016 Kayenta Mine Complex
(all files are pdf)
2016 Kayenta Mine Complex CHIA (entire document) (25.4 MB)
Table of Contents (503 KB)
Chapter 1 - Introduction (289 KB)
Chapter 2 - Cumulative Impact Area (2.6 MB)
Chapter 3 - Water Resources Uses and Designations (206 KB)
Chapter 4 – Baseline Hydrologic Conditions (3.7 MB)
Chapter 5 – Hydrologic Impact Assessments (3.8 MB)
Chapter 6 – Works Cited (37 KB)
Appendix A - Material Damage Criteria: N Aquifier Water Levels (555 KB)
Appendix B - Regional d- and n-aquifer Baseflow and Spring Discharge Field Evaluation (14.0 MB)
For Reference: 2011 Kayenta Complex Documents
(all files are pdf)
Kayenta Complex 2011 (entire document) (21.3 MB)
Table of Contents (624 KB)
Chapter 1 - Introduction (2.18 MB)
Chapter 2 - Cumulative Impact Area (3.75 MB)
Chapter 3 - Water Resources Uses and Designations (175 KB)
Chapter 4 – Baseline Hydrologic Conditions (10.2 MB)
Chapter 5 – Hydrologic Impact Assessments (4.41 MB)
Chapter 6 – Works Cited (25.4 KB)

Page Last Modified/Reviewed: 12/22/16

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