>>2756479phase i's are for real property due diligence. every real property, except inter-state / tribal / federal shit. there are no requirements for SFR; however, interested parties can always pay two or three thousand for an ESA if they feel like it. 90% of the phase i esa jobs are commercial properties, like taco bell, apt complexes, malls, warehouses, etc...
if you want to discuss those federal reports where they investigate EVERY aspect of disturbing untouched land that travels across multiple states, you are thinking of NEPA reports. NEPA. NEPA. ESAs are local research reports, essentially. ive always been Pinchot kinda guy. Muir can suck a dick on some mountaintop.