I would need some more information as this can be a couple of different things..
It could be for brand new construction,
it could be for buying an existing home for NHD - Natural Hazard Disclosure
It could be the Environmental report we give each buyer when purchasing a home.
Ingrid Ski Realtor
Are you referring to building a new home on a lot? If so that is an inspection required by the city of Fullerton prior to getting permits to build a new home. If you could provide more details I could be more accurate for you.