I did a site survey and have a very accurate and detailed map of the property. Stuff was hooked up and disconnected (property has been in the family since pre-civil war days) and there are pipes, wells, cisterns and old foundations here and there. Up until I started caretaking the property, everything was word of mouth. I started documenting everything. There was a drainfield on the other side of the pole barn that was never recorded and now not used. Stuff like that can cause problems. I was sure the closest possible source was the present drainfield at 139' (MD requires 100' from any source of contam. and 30' from any building or property line.