Final answer:
During Phase 2 of an Environmental Site Assessment, the certified environmental site assessor investigates potential contamination sources and assesses the extent of contamination through laboratory analysis of samples. This phase involves collecting soil, water, and air samples, conducting geophysical surveys, and monitoring groundwater quality.
Step-by-step explanation:
During Phase 2 of an Environmental Site Assessment (ESA), the certified environmental site assessor performs a detailed investigation of the site to identify potential sources of contamination and assess the extent of the contamination. This typically involves collecting soil, water, and air samples from various locations on the site and analyzing them in a laboratory for the presence of hazardous substances. The assessor may also conduct geophysical surveys and install monitoring wells to monitor groundwater quality.