U.S. Environmental Protection Agency

In this action, the Environmental Protection Agency (EPA) promulgates revisions to the Guideline on Air Quality Models (‘‘Guideline’’). The Guideline provides EPA’s preferred models and other recommended techniques, as well as guidance for their use in estimating ambient concentrations of air pollutants.

Arizona’s climate is changing. The state has warmed about two degrees (F) in the last century.

Method 1312 is designed to determine the mobility of both organic and inorganic analytes present in liquids, soils, and wastes.

This guidance document is designed to assist the user in the evaluation of plume visual impact as required by the Prevention of Significant Deterioration (PSD) and visibility regulations of the U.S. Environmental Protection Agency (EPA).

This report represents a state-of-the-art synthesis of current knowledge of the ecology and hydrology of ephemeral (dry washes) and intermittent streams in the American Southwest.

This report provides chemical, physical, mineralogical, and microbiological procedures for the analysis of coal overburdens and the resultant minesoils. These step-by-step methods identify and measure rock and soil properties that influence advance planning, mining efficiency, post-mining land and water quality and long range land use.

This Executive Order is designed to focus the attention of federal agencies on the human health and environmental conditions in minority communities and low-income communities.

Comments from each of the six public hearings are available for viewing. Note that the public comment period is now closed.

Public Hearing Comments

Draft EIS

The draft EIS public comment period closed November 7, 2019. All 30,000+ comment submittals are now under review for consideration in the compilation of the final EIS.

Media & General Info

Point of Contact
John Scaggs
Tonto National Forest

Apache Leap Special Management Area
Apache Leap SMA website