Contents of concept plan. In addition to the information required at Article XII, the concept plan shall consist of a sketch map, and for major subdivision applications, a written report that contains the information set forth in § 230-90 of this chapter. A nonprofessional may prepare the concept plan itself, which need not be fully engineered or surveyed. The sketch map portion of the plan should be neatly and accurately drawn. The written report accompanying the plan should be presented neatly and concisely. Information used to prepare the concept plan may be taken from secondary source information such as the Natural Resources Conservation Service Maps or U.S. Geodetic Survey maps, but shall be sufficiently detailed to allow the Planning Board or its designated subcommittee to make suggestions on general site design and layout for circulation, stormwater management, location of open space, buffers, building arrangements, and to determine how the requirements of the Land Use Ordinance affect the proposal.