Is the groundwater aquifer around the Lambton Facility linked by an underground stream to Lake Huron?
No. Scientific knowledge about the mechanism by which groundwater moves refutes such a claim. The subsurface geography of western Lambton County, an area called the St. Clair Clay Plain. The plan is characterized by a clay till layer approximately 38-45 metres (130-150 feet) thick, which overlies shale bedrock. A thin layer [0.5 metre (1.5 feet)] of sand, silt and gravel is occasional present overlying the bedrock. This material, where present, combined with the upper metre or two of bedrock is moderately permeable and has historically been used as source of water supply for area farms and residences. The narrow zone is called the Interface Aquifer’. University of Waterloo researchers have studied groundwater movement in Lambton County and have determined that movement occurs through two zones, namely a thin surface layer of weathered clay and the aforementioned Interface Aquifer. Water that infiltrates into the weathered clay moves lateral to nearby water courses (stream and roadside
