Brief

At an active gasoline retail station in Rio de Janerio, historical spills of the gasoline residues resulted in groundwater impacts to the underlying sand aquifer. Impacts included including benzene, toluene, ethylbenzene, and xylenes (BTEX), gasoline residues and naphthalene. ASR was retained by the facilities owner to address the impacted groundwater using an insitu remedial program with the objective of mass reduction and mitigating off site and human health risks.

Process

The site owner along with their environmental consultant worked with ASR to develop a remedial work plan based on meeting the remedial objectives for the site. After reviewing the geology, hydrogeology and geochemistry of the site, ASR developed a plan that used aerobic bioremediation to address the dissolved phase impacts. The plan used direct push technology coupled with oxygen-releasing materials to facilitate the destruction of the BTEX and gasoline residues within the groundwater. Additional monitoring included compound specific isotope analysis (CSIA) along with detailed microbiological assessment of the aquifer.

Results

Over 65,000 kg of remedial solution being injected over a 2- week period at low pressure.

Reduction of BTEX concentrations of greater than 99.9 percent for a two-year period.

Injection program completed under budget and under schedule resulting in a 7 percent savings for client.

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