Dig anywhere in Cape May County and you hit old beach — sand that takes water down and away before a lawn can drink it. Coastal Landscaping & Sprinkler Systems builds around that fact: irrigation zones laid out for a yard's real shape, heads set so the spray lands on grass instead of pavement, spring start-ups in April and blow-outs before the pipes can freeze. Summer mornings around Rio Grande and Burleigh open under a low fog that burns off by nine, and a system stepping through its zones is one of the first sounds awake. Mowing, edging and trimming follow the same week-to-week rhythm, because water and regular cutting are most of what green grass asks for. When July turns the road shoulders brown and a lawn stays even and deep to the corners, that is the system doing its quiet arithmetic.