A phase one environmental assessment reviews historical records, aerial photographs, regulatory databases, and site conditions to identify recognized environmental conditions, which are indications of past or present contamination from prior land use. For commercial properties along Hattiesburg's Highway 49 and Highway 98 corridors, where older industrial and commercial operations may have used or stored hazardous materials, a phase one is the standard first step before a purchase or refinancing. If the phase one identifies concerns, a phase two assessment with soil and groundwater sampling is the next step to confirm or rule out actual contamination.