I found out something else I didn't know - where the covers for the septic tank were....I had to have the tank pumped, but first, I had to have someone come in and find and dig out the covers for me. Now that I know where they are, I'm going to have risers put on them so they aren't buried quite as deep.  It wasn't a big deal to dig them out when our ground was saturated and soft, but it's a whole different thing to dig them out in August, when our ground is rock hard....