July at Lake Arbor is bare feet, sprinklers and the smell of cut grass drifting three houses down. Lawn Smiles works those Arvada neighborhoods in the thick of it — mowing on a set day, edging the walks, trimming around the swing set and the fence posts. Aeration and overseeding go in when the ground cooperates, and fertilization keeps the green from thinning out in the heat. Fall means leaves off the lawn before the snow flattens them. A yard kids can run across barefoot is a fair measure of the work.