older homes have clay pipe, cast iron very rare. newer homes have
plastic pipe. clay pipe would drill pretty easy

Thats interesting. Thought I read somewhere that they never use plastic
under the house so that it could support the weight of the house and not
crack. Or something like that.

But like I said, my levels are down to 3.5 now and still dropping. Im so
pleased right now. Thanks Haller and others for the help.

My dad brought up a good point on the phone last night...saying I should buy
a plastic elbow connection as well so that the pipes will bend upwards when
installed. Im going to home depot soon...not sure if i'll do the drilling
or not. if so, i'll be careful.