Soil Gas and Vapor Intrusion Surveys
BASELINE has experience performing soil gas surveys to evaluate the potential for vapor intrusion impacts to existing or future buildings at sites that have been impacted by volatile organic compounds in the soil and/or groundwater. BASELINE follows current regulatory guidance documents from the Department of Toxic Substance Control and the Regional Water Quality Control Board when performing soil gas surveys. BASELINE has also experience performing both indoor air and sub-slab vapor sampling and evaluations. BASELINE typically evaluates the air sample results from soil gas surveys, indoor air or sub-slab vapor sampling by comparing the results against screening levels from the appropriate regulatory agency. If further evaluation is required, BASELINE has professional staff with experience in performing human health risk assessments based on appropriate land use scenarios. We have successfully implemented vapor intrusion mitigation measures such as land use restrictions or engineering controls to allow use of sites with potential vapor intrusion impacts, substantially reducing costs relative to active remediation approaches.