Protecting Alaska's Water Quality Through Relative Source Contribution Analysis
This document discusses the concept of Relative Source Contribution (RSC) in determining allowable exposure levels for water contaminants in Alaska. It explores the need for regional adjustments based on specific dietary information and consumption patterns of aquatic life. The debate centers on whether incorporating marine species and market fish in the Food Consumption Rate (FCR) justifies departing from EPA defaults and adopting a tailored RSC approach. Various viewpoints and next steps for implementing RSC protocols are also outlined.
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Presentation Transcript
Issue 5. Relative Source Contribution Generic definition: The Reference Dose is your total allowable exposure. RSC allows WQC to be adjusted downward so other sources of exposure than consumption of water & aquatic life can be accommodated. GA responses generally focus on what should be FCR v. RSC GA: Consider regional adjustments based on diet-specific information Adjust based on consumption of resident v. non-resident aquatic life consumption GA: Some data (e.g., tissue) may be available in certain regions GA: DEC may need to address data requirements before RSC to be adjusted on a regional/SSC basis Improving and Protecting Alaska's Water Quality 1
Questions to consider Question- If Alaska includes marine species and market fish as FCR, does this provide a basis for not adopting EPA defaults? Options Adopt an RSC of 1? Departure from EPA 2000 methodology Assumes WQ criteria account for entire reference dose Policy Statement: CWA should not be used to account for other sources than water Adopt EPA RSC (0.8-0.2) depending on the pollutant Improving and Protecting Alaska's Water Quality 2
Discussion Consensus Dissenting Opinion(s) Improving and Protecting Alaska's Water Quality 3
Next Steps Implementation Discussion DEC will review notes from today and create a draft for your review DEC will begin to draft a TWG Recommendations document Previous draft may be reformatted based on feedback Goal is to have a draft for your review by December 1 Improving and Protecting Alaska's Water Quality 4
