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Are wetlands included in the definition of "environmental receptors"?

No. EPA has defined environmental receptors as natural or state parks, forests, or monuments; officially designated wildlife sanctuaries, preserves, refuges, or areas; and Federal wilderness areas, that are easily identified on local U.S. Geological survey maps (40 CFR §68.3). Therefore, wetlands would not be reported in the hazard assessment under 40 CFR §68.33. However, under the five-year accident history at 40 CFR §68.42 any known damage to a wetland would be reported as environmental damage.