What is a CHIA?

A Cumulative Hydrologic Impact Assessment (CHIA) assesses whether the mining operation has been designed to prevent material damage to the hydrologic balance outside the permit area. Read more...

Kayenta Mine Complex 2016

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 (OSMRE) is required by regulation 30 CFR 780.21(g) to complete a cumulative hydrologic impact assessment (CHIA). Read more...

Navajo Mine 2015

As the regulatory authority for the Navajo Transitional Energy Company (NTEC), a Navajo Nation owned Limited Liability Company (LLC), the Office of Surface Mining Reclamation and Enforcement (OSMRE) is required by 30 Code of Federal Regulations (CFR) § 780.21(g) to complete a cumulative hydrologic impact assessment (CHIA). Read more...

John Henry No 1 Mine 2014

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 (OSMRE) is required by regulation 30 CFR 780.21(g) to complete a cumulative hydrologic impact assessment (CHIA). Read more...