What are some of the general assumptions for a site-specific groundwater risk assessment/analysis at an SRS site?
• For initial screening of contaminants of concern, please refer to other Frequently Asked Questions (FAQs) for guidance. • For compounds that have them, the Montana numeric water quality (DEQ-7) standards are the cleanup levels, and performance of a risk assessment/analysis for groundwater is not necessary. The DEQ-7 standards are equal to or are more protective than the EPA Safe Drinking Water Standards. • For compounds that do not have DEQ-7 standards, risk-based screening levels (RBSLs) from the Montana Tier 1 Risk-Based Corrective Action Guidance for Petroleum Releases (RBCA) document may be used as cleanup levels or site-specific cleanup levels may be calculated. • For compounds that do not have DEQ-7 standards or RBSLs, it may be possible to use the tapwater regional screening levels (RSLs) provided in the Regional Screening Levels for Chemical Contaminants at Superfund Sites document. Please note that the RSLs for carcinogenic compounds are based on a 1×10-6 cumulative risk, wh
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- What are some of the general assumptions for a site-specific groundwater risk assessment/analysis at an SRS site?
