The implementation of site-wide corrective action using risk-based decision making at large and complex industrial, energy or defense facilities presents a number of challenges. To address these challenges, a spatial environmental risk assessment methodology has been developed by connecting Geographic Information Systems (GIS), relational databases and spreadsheets. The methodology is based on a description of the facility and a site conceptual model. A case study site with multiple potential sources, transport mechanisms and receptors has been used to evaluate the methodology. The case study facility is an approximately 300-acre crude oil refinery and petroleum products terminal that has operated since the early 1900’s. This paper will discuss the development of two key elements of the spatial environmental risk assessment, the Digital Facility Description and the Spatial Site Conceptual Model using the GIS application
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