Upon the filing of such application, the Land Use Board shall fix a date and place for a public hearing to be held on the application. If, after considering the evidence submitted at such hearing, the location and physical characteristics of the premises or building intended to be used as a public garage or service station and other hazards, existing conditions and surroundings, the Land Use Board shall find that such proposed use will not be detrimental to the health, safety and general welfare of the community and is reasonably necessary for the convenience of the community, it shall grant the application and direct the Construction Official to issue a permit subject to any conditions imposed.