A conventional plan in full conformance with all zoning, subdivision regulations, health regulations, wetlands regulations and other applicable federal, state and local requirements. This conventional plan shall be prepared in conformance with the requirements for a preliminary plan as set forth in the Subdivision Rules and Regulations of the Planning Board; provided, however, that in simple cases, such requirements may be waived by the Planning Board. In any event, the proponent shall have the burden of proof with regard to the design and engineering specifications shown on such conventional plan. Where the applicant intends to proceed pursuant to §
218-9.1, Flexible development, the conventional plan may be the yield plan, as defined therein.