Over the last decade, there have been vast improvements to the design, construction and operation of gas stations. Prior to these new systems, small amounts of gasoline spillage and vapors could easily seep into the ground and contaminate our water. One of the spill containment strategies includes a required concrete pad with positive limiting barriers (PLBs). PLBs are grooves in the concrete around the edge of the dispensing area to hold a minimum of 5 gallons of fuel and are usually required by municipalities to be constructed and maintained. While there are now a variety of systems in place to contain gasoline groundwater contamination, there is a risk that they are not being maintained properly due to several factors such as poor employee training, owner oversight or even neglect. There are just not enough inspectors to ensure compliance across Canada.