The applicant applying for permission to construct an ECHO unit shall submit a sketch plat, which shall be to scale, showing the location of all existing or proposed buildings, structures, drives and walkways and the layout of utility services, including proposed water and sewer connections, plus landscaping and screening if such are contemplated. Said sketch site plat shall be endorsed, in writing, by the government agency which will own the ECHO unit. The said site plan sketch shall be of sufficient detail and shall be submitted in sufficient numbers of copies to adequately inform the Planning Board concerning the proposal. The said plat shall be reviewed by the Planning Board and the Board Engineer. The Board Engineer shall determine completeness.