Schmaley... FYI
http://inspectapedia.com/septic/Septic_Tank_Depth.htm has more information on septic tanks than you would ever want to know :biggrin:
ETA: Not expensive to maintain, considering that where I live, the SEWER costs paid to the utility here is a standard 2x charge of the water costs. Put them in, and minimal maintenance. Some folks have NEVER had to pay to empty them. :moo:
ETA#2: My good friend grows tomatoes right above his septic/drain field, and the are the BEST BEST BEST maters you have ever had. I cannot wait to have my first mater sammich from his garden.... usually the 4th of July is when they come in!