• Introduction of PersulfOx® resulted in reduction of PHCs in fractured bedrock, meeting site remediation goals
• High sulphate concentrations in groundwater resulted from the application of PersulfOx which is assisting natural attenuation of any residual petroleum hydrocarbons

A former farming facility located in Calgary, Alberta contained three above ground storage tanks (ASTs) and two pump islands. Environmental assessments related to the planned urban redevelopment of the former farming facility revealed contamination of the soil and groundwater beneath the site with petroleum hydrocarbons (PHCs) due to release(s) from the former ASTs. During a remedial excavation, PHC impacts above the applicable vapor inhalation guidelines were identified within the fractured bedrock. Given the nature and depth of the bedrock, the remedial excavation was no longer feasible. Therefore, PersulfOx, a proprietary chemical oxidant chemical, was utilized for in situ treatment of soil and groundwater within the excavation to reduce the remaining PHC concentrations below the commercial vapor inhalation guidelines.