One benchmark shall be set in each subdivision containing up to one hundred lots. One additional benchmark will be required for each additional one hundred lots, or fraction thereof. The location of the benchmark(s) shall be approved by the engineering department.

    A.    The developer's land surveyor shall establish elevation deviation by a closed level circuit from the nearest USGS benchmark.

    B.    Each benchmark shall be installed behind the curb line at an intersection so that the top thereof is level with the top of the curb, unless otherwise excluded by the engineering department. Standard details are on file with the engineering department.

    C.    The benchmarks shall be concrete (possessing a twenty-eight-day compressive strength of 4000 p.s.i. and six percent air entrainment), precast or poured in place. The minimum dimensions shall be twelve inches square by thirty-six inches. The benchmarks shall be marked on top with a three-inch diameter, curved head, brass marker set flush with the top of the monument. The brass markers shall be supplied at cost by the engineering department. (Prior code § 28-58)