If they are installing a new system for you just have them install a 6 Pipe with a lid from both of your access holes. It will probably run you another $500 but it is better than having to dig it up for access. Actually they might have already included that in your price as it's standard practice now. The chunks of matter stay in your concrete tank and the water runs off into your leechfield. You would have major problems if you let your septic get so full that chunks are getting into your drainfield. If you don't have a huge family you can get away with pumping it out about every ten years. We went 9 years on ours and it could have went longer. The key is to take care of it and not to flush stuff that is hard to biodegrate like clorox spounges etc. I wouldn't even try the 50 gallon drum trick unless you were living in the boonies in a cabin or something. Hope that helps. Oh yeah. If your going to install the pipes for the two access ports you might as well do the two inspection ports too.