[pushkins]

If it is a true "mound system" then the tank is in the mound and the leach lines are spread away from the tank, with this system and the tank being higher than the lowest plumbing in the house there is a smaller tank that collects the waste and then a pump that pumps it up into the tank, from there the normal septic tank system resumes.

Most if not all cities/counties have very strict codes for septic tanks and systems, contact your local plumbing department at City Hall or County Inspections dept. for who is in control of codes in your area.

Make sure you do this, if someone installs a septic system in the wrong/unapproved place they can make you remove it and then re apply for permits and allowable locations for installation. Nowadays most environmental/plumbing departments are very VERY concerned with unapproved installations.