Filming companies hoping to dip their toes into Lake Lanier and other Army Corps of Engineers property — like the one that recently shot Netflix’s “Ozark” series — have to dot all the i’s before shooting. “We, the Corps, have been given the responsibility to manage it wisely for the public’s good, so when these commercial ventures come in ... and they want to film here, we have to look at what the impact is going to be,” said Nick Baggett, natural resource manager for the Corps at Lake Lanier.