We seem to insulate underneath the houses a lot, as well as the roof.

Find a clay based soil .  

Marco Giovannoli If you want to do this on your own, I suggest you:- speak with a planning consultant to get a good idea of the approvals process and timeline; - speak with an engineering consultant will give you an idea of the costs involved with servicing a site that size and a reasonable timeframe to complete the work;- speak with the town planning department to get a sense of the town's view regarding the development and determine the paperwork/studies that will have to be submitted;- ask the vendor/broker if there is an environmental report done for the site to determine the extent to which soil remediation will need to be undertaken;If this is your first project, I highly suggest you find a developer to partner with in order to learn the process first.

Check on the USGS website and you'll notice that PR has hundreds of type s of soils vs. states that have less than 10.

Window wells shall be designed for proper drainage by connecting to the building’s foundation drainage system required by Section R405.1 or by an approved alternative method.Exception: A drainage system for window wells is not required when the foundation is on well-drained soil or sand-gravel mixture soils according to the United Soil Classification System, Group I Soils, as detailed in Table R405.1.R310.3 Bulkhead enclosures.

Window wells shall be designed for proper drainage by connecting to the building’s foundation drainage system required by Section R405.1 or by an approved alternative method.Exception: A drainage system for window wells is not required when the foundation is on well-drained soil or sand-gravel mixture soils according to the United Soil Classification System, Group I Soils, as detailed in Table R405.1.R310.3 Bulkhead enclosures.

Can you simply fill the low spots with top soil and re-seed?  

Michael Lazzizzera I would be interested in buying an easement underneath your billboard and the billboard itself.

The risk is that the tank leaks and you'll be looking at crippling cleanup costs.If it were me, I'd make my offer contingent on the tank being removed and the surrounding soil being tested by a licensed environmental testing contractor and coming back clean.

I know I know I know get it removed get it removed or the soil tested.