If they're underneath, you can get a long skinny brush made for doing this; it looks kind of like a giant pipe cleaner or bottle brush. 

See the #s Below: -Purchase Price: $61,500-Closing Costs: $1,890-Rehab Costs: $13,154-Holding Costs: $4,102-Cosmetic Rehab, interior paint, new kitchen, new bathroom, tore up carpets to find hardwood floors underneath, exterior landscaping.

See the #s Below: -Purchase Price: $61,500-Closing Costs: $1,890-Rehab Costs: $13,154-Holding Costs: $4,102-Cosmetic Rehab, interior paint, new kitchen, new bathroom, tore up carpets to find hardwood floors underneath, exterior landscaping.

If there is a buried tank then you seriously risk soil contamination if the tank ever leaked oil.

He never completed any of the typical soil study, phase 1, zoning request, etc. and therefore they did lose any money on the deal, but it cost us four months of dead marketing time and then had to restart the marketing process all over. 

Site conditions are pristine (almost completely flat with minimal grade and soil work needed).

Maybe not that hard since I have access underneath.  

If this wasn't part of the original system, that means a new system will require the contractor to haul in many, many truck loads of sandy soil to elevate the system to a proper height above the water tabel.

My units do not have a carport underneath but it looks like I have to "prove" that I don't need to do anything.

@David McCracken In this case stopping the water might be the easy part........... install elbows on the down spouts and lead the water about 4 feet from the foundation; install a French drain around the foundation where the soil is the highest-usually 3 sides and lead the water away from the building.