ECHO units shall conform to all other provisions of the Greenwich Township Code as to accessory structures; may be manufactured dwelling units as elsewhere defined and regulated, provided that the width or shorter horizontal dimension of the unit shall be no less than 22 feet; shall be provided with adequate water supply and sewage disposal arrangements, which may be by means of interconnections with the facilities of the principal residence as approved by the Code Enforcement Official and the Health Officer; and shall be erected upon a foundation of pressure-treated wood or equivalent material which meets applicable construction codes while allowing complete removal when the need for the unit ends.