Kind of a weird title to this topic, but that is okay. I have a rancher house with a crawl space under it that is currently a dirt floor. There is plastic over the dirt, however, it is technically a dirt floor, but the foundation is concrete. I have recently had rats burrow under the concrete and taken up residence in the crawl space. I have found their access hole and filled it in with a bag of redi-mix concrete, and surveyed the remainder of the foundation and determined that this was their only access. BTW, I hate rats, or any rodents, with a passion, and to know the buggers were down their just grosses me out. So the only solution to ensure this never happens again is to have a concrete foundation poured, and this is happening next week. The company is bringing the truck, a line pumper and finishing guys as I am not going down there and spreading concrete for a day. Now, my questions. Should I dig a hole at one end into the ground, insert a PVP pipe and rocks and use this for a drain. Will this be sufficient? What other prep things should I be thinking about before they get here?