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CHIAs

Kayenta Complex 2011

2011 CHIA Update for the Kayenta Complex

As the regulatory authority for Peabody Western Coal Company (PWCC) surface coal mining and reclamation operations at the Kayenta Complex, the Office of Surface Mining Reclamation and Enforcement (OSM) is required by regulation 30 CFR 780.21(g) to complete a cumulative hydrologic impact assessment (CHIA). The CHIA assesses whether the mining operation has been designed to prevent material damage to the hydrologic balance outside the permit area. The CHIA is not updated at a specified interval. 30 CFR 780.21(g)(2) states "an application for permit revision shall be reviewed by the regulatory authority to determine whether a new or updated CHIA shall be required." A revision to PWCC's permit application package was submitted to OSM in September, 2010, and OSM subsequently determined the CHIA should be updated. This most current update to the CHIA (2011) replaces the 2008 updated CHIA and the original CHIA written in 1989.

Kayenta Complex 2011 (entire document) [ (21.3 MB)]

Individual Chapters

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)]

FOR MORE INFORMATION

Contact Mr. Paul Clark at pclark@osmre.gov or by telephone at 303-293-5065.

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