Initial Site Assessment (ISA) – This is a non-intrusive assessment for identifying and evaluating hazardous materials and waste sites that could potentially impact a roadway project.

Phase I Environmental Site Assessment (ESA) – This is a non-intrusive, generally site-specific assessment. The Phase I ESA is conducted in accordance with American Society for Testing and Materials (ASTM) E 1527 standards.

Phase II Environmental Site Assessment (ESA PH II) – This is an intrusive assessment conducted to confirm the presence of soil or groundwater contamination or waste through the collection and analysis of representative site samples.