Purpose. The Industrial District is intended primarily for uses engaged in light manufacturing, assembly, fabrication, warehousing and retail trade, and service operations which conduct all activities with little external impact or effect. No structure or use shall be permitted which emits or would have a tendency to emit noise, vibration, radioactivity, glare, odor, gas, groundwater pollution, fire or explosion at a level of intensity, duration and frequency as to unreasonably endanger the health, comfort or safety of any person or cause serious damage to neighboring property.