Ambient Water Quality Criteria For the Protection of Human Health.'Hexachlorobutadiene (HCBD)'. Draft

摘要

This criteria document updates the criteria for hexachlorobutadiene using newmethods and new information described in the Federal Register notice (PB99-101644) to calculate ambient water quality criteria. These include new methods to determine toxicity dose-response relationships for both carcinogenic and noncarcinogenci effects, updated exposure factors (e.g., values for fish consumption), new exposure assumptions used in the calculation, and new procedures to determine bioaccumulation factors. The Technical Support Document (TSD) (PB99-101297) accompanying the Federal Register notice describes these methods in greater detail. In additional to the new methods and information described above, new information on toxicity, exposure, and bioaccumulation of hexachlorobutadiene is also included in this update.