Last week I drove over to see how things are going. I saw the the surveyors were there! So exciting!! We came back a few days later and the black silt fence was up. And of course I needed to look to that is suppose to do. "The purpose is to allow sediment from storm or flood water to settle rather than getting washed into streams or sewers. Excavation of foundations exposes subsoils such as clays and silts; runoff washing this off site can cause various problems; if the silt washes into a drain, it can cause a blockage and if it runs into a pond or river, it can cause significant damage to the ecosystem there. I can't find it now, but I remember reading an article a while back about (I think)a fish farm that suffered severe loss of stocks due to runoff contaminated with yellow clay from a nearby construction site."
