So you've just bought your new dream home, but you're looking into having work done on your septic system. Perhaps you're curious about how your septic tank works. In any case, the following documentation should help to clear up many questions you have regarding the septic installation process.
EPA Septic Guide - The Environmental Protection Agency's definitive guide to 'Septic 101'.
Homeowner's Guides - Another informative brochure from the National Small Flows Clearinghouse.