The objective of the project was to delineate the petroleum hydrocarbon (PHC) impact encountered at the site and to determine the probable source of the impact in order to develop a remedial action plan (RAP).
During the excavation for a new water line at the project location, PHCs were encountered. The Province of Manitoba Department of Sustainable Development requested that the soil and groundwater at the site would be assessed to determine the extent and probable source of the PHC impact.
Historical research at the site determined that the project location was previously occupied by “Tin Town” and would have primarily used heating oil to heat the houses. The chromatograph of the PHC impact in soil at the original water line excavation indicated that heating oil was likely the substance that was encountered.
An environmental site assessment was subsequently conducted to assess soil and groundwater conditions. The drilling program included the installation of five monitoring wells completed in the shallow (4 metres below grade) and deep (10 metres below grade) groundwater. Chemical analysis of soil and groundwater indicated that the PHC impact was isolated to two small areas that were likely the result of limited amounts of heating oil.
A RAP for the site recommended that an estimated 75 m³ of PHC-impacted soil should be excavated and disposed of off-site at the nearby landfill. The client subsequently conducted the recommended remedial actions. A Closure Letter from Manitoba Sustainable Development was subsequently obtained for the Site.