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Directory Results for RCRA Corrective Action Environmental Indicators Determinatrion for Bigard Oil Newton, IllinoisUS EPA ARCHIVE DOCUMENT. Environmental indicators (EI) indicate the quality of the environment in relation to current human exposures to contamination and to RCRA Corrective Action Environmental Indicators Determinatrion for Brush Wellman Incorporated Elmore, OH. Environmental indicators (EI) indicate the quality of the environment in relation to current human exposures to contamination and the