The 1986 Superfund Amendments and Reauthorization Act (SARA) specified that any remedial actions at Superfund sites must comply with applicable or relevant and appropriate regulations (ARARS), including Federal, state, and local environmental statutes. Identifying these legal requirements for a particular hazardous waste site can be a complex and time consuming process. The EPA Risk Reduction Engineering Research Laboratory is developing a prototype knowledge-based system to aid in screening regulations that determine clean-up requirements based on unique site characteristics. The decision logic follows that presented in the EPA documents such as CERCLA Compliance with Other Laws Manuals (Part I and II). Hence, it takes into consideration the chemicals at the site, the particular location features of the site, and the proposed remediations methods.