Drinking water is currently supplied to surrounding residents via the Elyria municipal water supply system. This site was addressed through Federal and State actions. Threats and Contaminants Groundwater and quarry surface water were contaminated with heavy metals, such as beryllium, cadmium, and manganese. Other metals in the ground and surface water included barium, iron and copper. Heavy metals and PNAs were also contaminants of concern in the site soils.
Physical hazards exist at the site as well due to the sheer quarry walls and deep water.
Cleanup Progress U.S. EPA conducted a streamlined remedy selection and removal action. The contaminated quarry sediments were to be left in place because these contaminants lay below the mixing zone and fish are not likely to come in contact with the contaminants. U.S. EPA concluded that remediation would likely entrain contaminated sediments in the water, thereby increasing the likelihood of exposure to contaminants by fish. The studies confirmed that no unacceptable risks were present at the time, however, during the time period between the baseline risk assessment and a post-ROD risk assessment, some contaminants were reassigned higher cancer potency factors by U.S. EPA, thereby increasing the carcinogenic risk. The Preliminary Close Out Report was issued on December 31, 1992.