The concentration of PM10 in the air in Hayden has been below federal standards for several years. ADEQ is developing a redesignation request so that EPA will reclassify the area as an attainment area.
This list contains assessment units that were assessed as impaired (Category 5) by ADEQ or EPA during the current and previous assessment listing cycles.
The goal of the Queen Creek TMDL project was to develop the site characterization and water quality data set needed to calculate the TMDLs for dissolved copper in the listed reaches of Queen Creek, Arnett Creek, and the unnamed drainages.
This guidance document has been developed by the Air Quality Division (AQD) of the Arizona Department of Environmental Quality (ADEQ) to document air quality modeling procedures for air quality permit applications for sources located in Arizona under ADEQ jurisdiction.
Located in southeastern Arizona, this semiarid basin is drained by the San Pedro and Gila Rivers. The Lower San Pedro is a rural landscape with scattered towns and two extensive copper mining and processing operations. Groundwater from three aquifers (floodplain, unconfined basin-fill, and confined basin-fill or artesian) and fractured mountain hardrock is the principle source of water supply.
Every two years, the Arizona Department of Environmental Quality (ADEQ) is required by the federal Clean Water Act to conduct a comprehensive analysis of water quality data associated with Arizona’s surface waters to determine whether surface water quality standards are being attained and designated uses are being supported.
Resolution Copper Mining (RCML) is hereby authorized to close the facilities within this permit at the Superior Mine, West Plant Site, located in the Town of Superior, Arizona, over the groundwater of the Phoenix Active Management Area.
Every two years, the Arizona Department of Environmental Quality (ADEQ) is required by the federal Clean Water Act to conduct a comprehensive analysis of water quality data associated with Arizona’s surface waters to determine whether state water quality standards are being met and designated uses are being supported. This integrated surface water assessment and impaired waters listing report (2010 Assessment Report) serves three functions.
Good visibility is important to the enjoyment of national parks and scenic areas. Across the country, regional haze has decreased the visual range from 140 miles to 35-90 miles in the West, and from 90 miles to 15 -25 miles in the East. Regional haze is air pollution that is transported long distances, causing reduced visibility in national parks and wilderness areas.
