Call up Farmers National and ask them for an estimate of what the land is worth and have them provide you with soil maps.  

You really need to know the nitty-gritty about each.You mentioned that it had flooded during Hurricane Sandy - could be a big red flag.

As a wholesaler, am I supposed to perk test it myself, or do I include a clause in my contract that allows the buyer to conduct soil test and the deal is contingent upon results.  

As an alternative, you could be creative and do an impervious pavement, if the soil can handle the percolation rate...

I was just there looking at Mastic Beach but insurance is very high especially after hurricane Sandy.

It looks like soil/grass so you need a minimum of 2% slope around the house so all water drains away.

If you've already tried the first step by observing what happens outside and in during a heavy rain - making sure that water is redirected away from the foundation by making sure that the gutters are working correctly, the downspouts are emptying at least 6' from the foundation, and that the soil is graded away from the foundation - and you're just looking for a quick fix, you might try plastic or fiberglass wall panels.

Personally, when I think of threats to national security, I think of those things that have the ability to cause mass destruction on American soil and allow foreign regimes to destabilize and/or take over our government.

PPS @Sandy Brown I see it is your first post so welcome to BP.

It will be much, much cheaper than traditional indirect geothermal because they are allowed to bury the copper lines with coolant directly in the soil!