The RBCA Tool Kit for Atlantic Canada is a region-specific customization of GSI’s popular RBCA Tool Kit for Chemical Releases software. It is designed to complete the calculations required for Tiers 1 and 2 of the Atlantic RBCA protocol, including harmonization with the 2008 Canada-Wide Standard for Petroleum Hydrocarbons in Soil (CWS-PHC) developed by the Canadian Council of Ministers of the Environment (CCME). The RBCA Tool Kit for Atlantic Canada utilizes default parameters, modeling options, and chemical data consistent with Version 4 of the Atlantic RBCA User Guidance Documentation.