17.28.040   Performance policies.
   A.   Purpose. The following performance policies are intended to alleviate the -undesirable impacts of land use activities on the quality of the natural resources of the city zoning jurisdiction. These policies are also intended to reduce or eliminate the impact or objectionable uses on developed areas.
   B.   Electromagnetic Interference. No activity, use or process may be conducted which produces electromagnetic interference with radio or television reception in neighboring residential districts.
   C.   Obnoxious and Toxic Matter. No obnoxious, toxic, corrosive or radioactive matter, smoke, fumes or gases may be discharged across the boundaries of any lot in such concentrations as to be detrimental to or endanger the public health, safety, comfort or welfare or to cause injury or damage to property or business.
   D.   Noise. Noise emanating from any use may not be of such volume or frequency as to be unreasonably offensive at or beyond the property line. Unreasonably offensive noises due to intermittence, beat frequency or shrillness shall be muffled so as not to become a nuisance to adjacent use.
   E.   Erosion. The gradient of any land and its established cover may not be changed so as to cause erosion which carries soil, water or objectionable substances onto neighboring properties in an amount greater than before the grading or use change occurred.
(Ord. 441 Art. IV § 5, 1992) .