Can I do a risk assessment to close a site when the site has an exceedance of Montana numeric water quality (DEQ-7) standards?
No. DEQ-7 standards were developed to comply with requirements under the Montana Water Quality Act, the Federal Clean Water Act, and the Montana Agricultural Chemical Ground Water Protection Act and must be used. A risk assessment that provides site-specific cleanup levels may be appropriate for contaminants in soil, but not in groundwater.
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