All uses shall comply with all of the standards set forth below except:

Noise emanating from any use shall be muffled so as to not become objectionable due to intermittent beat, frequency or shrillness, and where use is within or adjoins a residential district. The sound measured at the lot line shall not exceed 50 decibels between the hours of 10:00 p.m. and 6:00 a.m. and 70 decibels at other hours.

Lighting shall not be used in such a manner that produces a glare on public streets and neighboring property.

The emission of obnoxious odors of any kind or any toxic or corrosive fumes or gases shall not be permitted. Dust created by a use shall not be exhausted or wasted directly into the atmosphere.

Vibration shall not exceed three one-thousandths of one inch displacement applied to the frequency range of zero to 5,000 cycles per second, as measured at any point on the boundary of the property from which the vibration is produced.

All mechanical, electrical, and electronic equipment shall be shielded to the extent necessary to prevent electrical, magnetic or radiological interference with the use of any equipment or process on abutting sites.

No organic or inorganic waste materials shall be disposed of or permanently stored or placed on the site.

All storage of materials and equipment except licensed motor vehicles shall be within fully enclosed buildings or surrounded by screening. Materials in process shall be stacked, sorted, or arranged in an orderly manner.

All buildings and other structures shall be maintained in original condition with respect to exterior appearance. All additions to existing buildings, new structures, alterations and major maintenance which affects exterior appearance shall be subject to the same review and approval process as originally followed in approval of the principal structure as per the adopted Uniform Building Code and Uniform Fire Code. All landscaped and open space areas shall be kept free of litter and debris. All plant material shall be kept thrifty, free of disease, dead material and weeds in landscaped areas.

If the mayor has reasonable doubt that a business or use is, or can be, conducted within the limits of the above performance standards, it may require that the user or proposed user retain, at his expense, an independent, qualified, testing laboratory of experts, acceptable to the city, to make an analysis of the use to determine its compliance with the standards and make the results of such analysis available to the city. If the site operator does not provide the required analysis within 30 days of the request, the mayor shall initiate such investigation and bill all expenses thereof to the site operator.

In the event the analysis indicates existing or impending noncompliance with these standards, the city building official or other authorized official shall require the user or proposed user to either institute remedial measures to bring the use into compliance or to cease operation. Further enforcement shall be as per Chapter 18.42.