Because it is the wet season, I was advised to cover the whole area with plastic, so that the concrete guys would not have to guess when they would have two successive days without a lot of rain.
I put all of this up yesterday, and OF COURSE there was a windstorm last night, which ripped it to ribbons. The today, I was out there again, this time with 4 mil (heavy) plastic sheeting, shaking my fist at the heavens!