Apache Station has 8 groundwater monitoring wells, 1 of which have been polluted above federal advisory levels based on samples collected between April 13, 2016 and September 06, 2019. Groundwater at this site contains unsafe levels of lithium.Site description
Apache Station is a 625-MW facility located in Sulphur Springs Valley, Arizona in Cochise County. The station is owned and operated by the Arizona Electric Power Cooperative (AEPCO), which began operating in 1979. It has three units, two that burn natural gas and one that can burn either coal or natural gas (or both in combination). Up until 2017, both the second and third units burned coal solely. Apache Station handles coal ash in four different ash ponds regulated under the CCR rule, a coal pile retention basin, a cooling tower blowdown pond, an evaporation pond, a low volume wastewater pond, and two scrubber ponds. Seven of its coal ash surface impoundments are on the EPA's 2009 list of high hazard potential sites. Nine of the ponds are lined.