Evaluation of coastal building site

[vaugh002]

I am considering placing a Park Model with deck and attached aluminum screen room in a new location on a slope just above a wetlands.This wetlands is just ajacent to a coastal river,10 miles inland. The park has varous lots some mininally elevated(concern of flooding) and some elevatied on a pure sand soil. The lots fall away at 20-30 degrees which to me seems steep and even if filled in partialy no retaining wall and environmental wetland restictions limit taper. Ground water exiting at river level has undermined and caved in sand on one of the higher lots.My concerns are these:
Stacked concrete block foundation with earth auger mobile home tiedowns would not be adequiet due to settling and inadequite anchoring to huricane winds especially on exposoed bluff with 10 mile fetch to ocean down river.Additionally I am conserned that differental settling of the Heavier Park Model will damage the screen room at its attachment to the Park Model.
My gut feeling is a piling foundation might be required.
Please advise me if you have some insight in to this
problem. Thanks in advance
Tom Vaughan

 

[Focht3]

Tom -

I think your gut is right.

Do you have a geotechnical engineering consultant? If not, you need to hire one -