Act 2 Closure & Remediation

Act 2 Closure & Remediation

When aes’ client identified potential delays in the construction of its new facility due to on-site environmental issues, we were contracted to address a release of approximately 5,000 gallons of gasoline at a retail refueling station that occurred as a result of a faulty dispenser fitting.

Construction contractors were on stand-by awaiting our efforts to mitigate site conditions sufficiently to allow construction to proceed. aes was given two months to effect soil cleanup, with groundwater remediation to follow in a manner that would not impede construction of the new facility. Complicating the situation was the prevention of adverse impact to a nearby public water supply well for the community; entry of gasoline and gasoline vapors into the adjacent sanitary sewer system; and the underlying complex limestone bedrock subsurface.

aes implemented an aggressive site characterization and concurrent remediation effort whereby impacted soils were excavated, treated by an on-site soil incinerator, and re-used on-site as backfill. Groundwater was treated by a pump and treat system followed by the installation of an aes-designed and operated sparging system to inject ozone gas into the aquifer to oxidize dissolved gasoline. A fate and transport study/risk assessment was completed validating the conclusion of no exposure risks.

Over 4,000 tons of soils were remediated in less then 2 months; reclaimed soil was re-used on-site as clean fill thereby eliminating the need to purchase fill for the construction project, resulting in significant cost savings for our client.

Construction proceeded while over 1,000,000 gallons of groundwater was remediated during the life of the project. Ozone gas sparging into groundwater reduced residual MTBE levels and enabled site closure goals to be achieved.

aes obtained site closure and a PADEP Act 2 Release of Liability.