Same to you down there in the sandy areas.

Offsets, root/soil intrusion and some build-up in the pipe.

Most engine lubricants contain lead and if handled improperly can contaminate the soil and thus allow lead to be tracked into the home.   

Before contracting on the lot, you should check with the local municipality to verify building requirements, current code requirements, list of required documents, surveys, soil tests, engineered plans, etc.Once you have identified your lot and finalized your estimate its time to build.You or your GC will get the permits.For the final build, there are 2 ways to build, as either a cost plus, or fixed price project.Hope this helps, let me know if you have additional questions.

For "black water" (waste from the toilet) we actually use a compost toilet so by the time it's full, the contents inside has been composted to be used in the soil.

My yard was sandy.

Clearing, ordering surveys, soil tests.

It is not a problem.There are different remedies, including soaker hoses and other remediation items, to limit soil impaction, but piers and leveling are common. 

The primary variables are depth, soil structure and the need for shoring, rock interference  and setback/travel distance.

And we haven't even gotten to roads, water management, soil corrections, water/sewer infrastructure, electric etc etc..