Concerns have been raised around potential exposure to the uranium that is known to exist in the bedrock in this part of Lanark County. This fact sheet is meant to put these concerns into perspective in relation to the proposed aggregate extraction by Thomas Cavanagh Construction Limited, as well as the current extraction and proposed expansion of the McKinnon Pit owned by Arnott Brothers Construction Limited. Both companies are asking to dig below the water table. These sites are along Highland Line near McDonalds Corners village in the southwest corner of the Township of Lanark Highlands. Both sites are adjacent to wetlands, with the proposed Cavanagh site adjacent to Barbers Lake. Each of these sites is beside one of the two branches of Long Sault Creek, which join together near County Road 12 (McDonalds Corners Road) and flow into the Mississippi River, which itself flows into the Ottawa River.