The PGA Superfund Site covers approximately 35 square miles in the City of
The U.S. Environmental Protection Agency (EPA) and the Arizona Department of Environmental Quality (ADEQ) have been investigating the contamination to the soils at and groundwater below the PGA South Superfund Site and attempting to remediate it since 1981. In 1983, EPA added both the PGA South and the PGA North sites to its National Priorities List, which is a list of sites across the nation that pose a risk to human health, welfare, or the environment that need to be cleaned up to eliminate or reduce such risks. Soil and groundwater cleanup efforts began at PGA North in 1994. Groundwater occurs in unconsolidated alluvial sediments at the Site generally consisting of silts and sands with some gravels and clays. Groundwater at the PGA North site is deep below the ground surface, ranging from approximately 60 feet below ground surface (bgs) in the south to 120 feet bgs in the northern portion of the site. Although there is currently no exposure to TCE impacted water, historically several City of
* EPA classifies TCE as a probable cancer-causing agent and at elevated concentrations TCE may cause damage to the liver and central nervous system. Potassium perchlorate interrupts the thyroid’s ability to properly utilize iodine to produce thyroid hormones.