Possible wetland on portion of raw land I'm buying

[Bill Coleman]

My wife and I are in the process of buying 0.46 acres across two parcels. One of the parcels potentially has a portion of it within a wetland but this is yet to be confirmed. We have wetland up to the boundary of the property for sure but our parcel is built up about 3 ft above the wetland parcels adjacent to it. I'm trying to confirm what we might be required to do in order to make this property suitable for a small 380 sq ft accessory dwelling unit (to act as a short term rental). 

There's not much info online and Army Corps site is not a help either. Building dept is impossible to reach right now. 

Does anyone out there have experience with this sort of wetland/raw land purchase?