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ORDINANCE NO. NS- 1441 PAGE TWO "Fixed noise source" shall mean a stationary device which creates sounds while fixed or motionless, including, but not limited to, industrial and commercial machinery and equipment, pumps, fans, compressors, gener- ators, air conditioners and refrigeration equipment. "Grading" shall mean any excavating or fill- ing of earth material, or any combination thereof, conducted at a site to prepare said site for construction or other improvements thereon. "Impact noise" shall mean the noise produced by the collision of one mass which may be either in motion or at rest. "Mobile noise source" shall mean any noise source other than a fixed noise source. "Noise level" shall mean the "A" weighted sound pressure level in decibels obtained by using a sound level meter at slow re- sponse with a reference pressure of twenty (20) micronewtons per square meter. The unit of measurement shall be designated as dB (A). "Person" shall mean a person, firm, associa- tion, copartnership, joint venture, corp- oration or any entity, public or private in nature. "Residential property" shall mean a parcel of real property which is developed and used either in part or in whole for resi- dential purposes, other than transient uses such as hotels and motels. "Simple tone noise" shall mean a noise characterized by a predominant frequency or frequencies so that other frequencies cannot be readily distinguished. "Sound level meter" shall mean an instrument meeting American National Standard Insti- tute's Standard S1.4-1971 for Type 1 or Type 2 sound level meters or an instrument and the associated recording and analyzing equipment which will provide equivalent data. "Sound pressure level"of a sound, in decibels, shall mean twenty (20) times the logarithm to the base ten (10) of the ratio of the pressure of the sound to a reference pressure, which reference pressure shall be explicity stated.