Filling stations and gasoline and oil service stations: special permit required. Since filling stations and service stations, while necessary, may be inimical to the public safety and general welfare if located without due consideration of conditions and surroundings, they shall be allowed only by special permit obtained from the Planning Board after first having had the opportunity to review the site plan showing the location and number of fuel pumps, the location, depth and capacity of fuel tanks, the number or capacity of automobiles that may be garaged within the principal building, the off-site improvements, landscaping, buffer zones and any other pertinent condition which might affect the public safety and general welfare.