While developing a site for a senior living facility, The Reynolds Group’s client encountered soil and groundwater impacted with gasoline. The contaminated groundwater was flowing from a gasoline station uphill from our clients construction site. Among the various issues presented by the migrating gasoline contamination was the concern of intrusion of benzene into the residences. Benzene is a component of gasoline and can off-gas from groundwater. In a vapor phase, benzene can then intrude into indoor environments.
Several options were available to address the concern, but the most cost-effective choice was to use the design of the proposed facility and not add to the cost of the project. The senior apartments were to be built over subterranean parking. Parking garages are required to have ventilation systems in place to mitigate carbon monoxide associated with vehicle exhaust. TRG was able to show that the ventilation system of the garage would adequately mitigate the residents exposure to benzene from the contaminated groundwater. This approach saved the project thousands of dollars in changes.