Driving up to the gravel pit there are a number of large trash piles (not really trash) but left from logging full of tree limbs and such. Each one as somehwere on it a piece of opague plastice sheeting. Can anyone explain what that is for??? It's not large enough to cover the pile. Most often it is right on top but then again can be part-way down the pile but always has at least some debris on it to keep it there. I'll bite...what the heck is it!!!