Vertex Environmental Inc., located in Cambridge, Ontario, specializes in the in-situ remediation of contaminated groundwater. They were contracted to clean up a former gas station site in Guelph, Ontario. The
contaminant plume containing gasoline and diesel occurs in unconsolidated silty sand to a depth of approximately 3 m (10 ft). The initial plume stretched 30 m (100 ft) long and 15 m (50 ft) wide.
A total of 14 Waterloo Emitters using LDPE tubing were installed in 4″ wells screened at and below the water table. Emitters were placed to form a “fence” a blue bottle in a room along the down gradient property boundary to cut off the contamination plume.
.......Within one month of the installation, DO levels in the monitoring wells increased an average of 880%. Initial PHC levels were a maximum of 27 mg/L (average 9.6 mg/L). Within six months, results showed that the levels of BTEX and PHC had dropped below the analytical detection limit, meeting the Soil, Ground Water and Sediment Standards of the Ontario Environmental Protection Act, thus enabling the Emitter system to be decommissioned just one year after installation.