Density for the R-2CL Districts is based upon dwelling units per adjusted gross acre as defined in § § 455-5 of Chapter 455, Subdivision of Land.[1] Maximum density per adjusted gross acre in the R-2CL District is three dwelling units. A bonus density of a maximum of one unit per acre for single-family dwellings is permitted for critical wetlands on site in the R-2CL Districts for provision of open space public access amenities on-site or off-site acceptable to the Planning Board in accordance with a Township open space waterfront public access concept of the Master Plan. Development in the R-2CL Districts should be clustered with consideration of proximity to the Delaware River. To encourage orienting housing toward the river and maintaining usable open space ensuring physical and visual access, the minimum lot size in the R-2CL District varies dependent upon the type of single-family dwellings in accordance with the following: