The Superfund program of the US Environmental Protection Agency (EPA) was created in the 1980s to address human-health and environmental risks posed by abandoned or uncontrolled hazardous-waste sites. Identification of Superfund sites and their remediation is an expensive multistep process. As part of this process, EPA attempts to identify parties that are responsible for the contamination and thus financially responsible for remediation. Identification of potentially responsible parties is complicated because Superfund sites can have a long history of use and involve contaminants that can have many sources. Such is often the case for mining sites that involve metal contamination; metals occur naturally in the environment, they can be contaminants in the wastes generated at or released from the sites, and they can be used in consumer products, which can degrade and release the metals back to the environment. This report examines the extent to which various sources contribute to environmental lead contamination at Superfund sites that are near lead-mining areas and focuses on sources that contribute to lead contamination at sites near the Southeast Missouri Lead Mining District. It recommends potential improvements in approaches used for assessing sources of lead contamination at or near Superfund sites. Table of ContentsFront MatterSummary1 Introduction2 Sources of Lead Contamination3 Environmental Dispersal of Lead4 Investigative Strategies for Lead-Source Attribution5 Implications for Southeast Missouri and Research NeedsAppendix A: Challenges to Obtaining Information about Lead Sources at Superfund Sites Associated with Lead-Mining DistrictsAppendix B: Biographic Information on the Committee on Sources of Lead Contamination at or near Superfund SitesAppendix C: Open Session Meeting Agendas
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