Prioritization for Interim Response Activities and Interim Response Activities Mitigation Decision Matrix. The primary objective of this IRA is to identify and mitigate potential human exposure to dioxins and furans that have been or may be found in soils prior to commencement of final response activities by Dow in accordance with an MDEQ approved Remedial Action Plan. Such final responses activities will be based on criteria established under Part 201 of Act 451. This IRA bases the need for interim response activities to mitigate exposure on an ATSDR action level described as “a concentration of dioxin in soil at which various actions may be considered to prevent or limit exposure.” That ATSDR action level is 1,000 ppt TEQ. Unless established otherwise through sampling, properties identified on Attachment A are presumed to exceed this action level and are designated as Priority 1. This initial IRA establishes mitigation options for Priority 1 properties to reduce exposure potential during the corrective action process before the final remedy is implemented.
Prioritization for Interim Response Activities and Interim Response Activities Mitigation Decision Matrix. The primary objective of this IRA is to identify and mitigate potential human exposure to dioxins and furans that have been or may be found in soils prior to commencement of final response activities by Dow in accordance with an MDEQ approved Remedial Action Plan. Such final responses activities will be based on criteria established under Part 201, Environmental Remediation, of the Natural Resources and Environmental Protection Action, 1994 PA 451, as amended. This IRA bases the need for interim response activities to mitigate exposure on an ATSDR action level described as “a concentration of dioxin in soil at which various actions may be considered to prevent or limit exposure.” That ATSDR action level is 1,000 ppt TEQ. Unless established otherwise through sampling, properties flooded by the March 2004 flood event are presumed to exceed this action level. Accordingly, this IRA establishes the following priorities for interim response activities:
