What are some of the general assumptions for a site-specific vapor intrusion risk assessment/analysis at an SRS site?
• For initial screening of contaminants of concern, please refer to other Frequently Asked Questions (FAQs) for guidance. • If volatile compounds are contaminants of concern at a facility: • Evaluate indoor air (inside habitable structure) and sub-slab (underneath the building foundation/basement) conditions to determine if sampling is necessary. • If no buildings exist at the facility, soil gas sampling will likely be necessary and institutional controls may be necessary to limit future exposure. • DEQ will consider alternative assumptions on a site-specific basis. • Exposure to outdoor vapors is addressed under the FAQ regarding general assumptions for a site-specific soil risk assessment/analysis. Specific Scenarios: While each facility is different based on its site-specific conditions, the following typical assumptions have been used and approved by DEQ.
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