Partnering on Puma Narangba Remediation Works

The Narangba site contains legacy groundwater cont­a­m­i­na­tion, including the presence of LNAPL and dissolved phase hydro­car­bons consistent with fuel loss event/s. Inves­ti­ga­tion works undertaken for Puma Energy indicated a dissolved phase hydrocarbon plume both beneath the active Puma service station and extending off-site to beneath the neigh­bour­ing residence. CDM Smith and Puma Energy worked with the Department of Environment Heritage Protection (DEHP) regarding actions that are required to limit the potential for human health and envi­ron­men­tal harm associated, and maintain envi­ron­men­tal values.

To assist Puma Energy in satisfying DEHP require­ments, and consistent with the NEPM recommended risk-based approach, CDM Smith enhanced the level of confidence in the proposed remedial approach that was practical, warranted and scien­tif­i­cally defensible.

Our proposed approach was based on obtaining a suffi­ciently detailed under­stand­ing of the hydro­ge­o­log­i­cal conditions beneath the site in order to allow for the development of a cost effective and justifiable remedial strategy for the site to protect human health and maintain envi­ron­men­tal values both on the commercial site, for the neigh­bour­ing residential properties and for the broader environment. Our remedial plan provided information on groundwater flow contaminant transport rates across the site in order to predict the extent of groundwater impacts beyond the site boundary, based on a number of remedial scenarios. This approach in conjunction with the current risk assessment process enables the preparation of clearly defined remedial goals which are protective of human health and the environment and aims to uphold envi­ron­men­tal values.