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NOISE AND VIBRATION CONTROL River County, providing that the crossing is equipped with train -activated auto- matic traffic -control devices, which shall include, flashing lights, bells and crossing gates. (15) Landscape maintenance. It shall be un- lawful for any person to undertake land- scape maintenance activities in such a manner as to create a noise or vibration disturbance to neighboring premises be- tween the hours of 8:00 p.m. and 6:00 a.m. (16) Power generators. It shall be unlawful for any person to manually or automatically exercise or test a power generator in such a manner as to create a noise or vibration disturbance to neighboring premises be- tween the hours of 6:00 p.m. and 8:00 a.m. Manual or automatic exercising or testing of power generators sha imum duration necessa facturer's specifications. (Ord. No. 90-16, § 1, 9-11-90; O § 1, 10-13-09) § 974.05 be for the min - to meet manu- No. 2009-016, Section 974.05. Additional noise control standards by zoning district. Except as may conflict with the specific noise and vibration provisions of section 974.04, it shall be unlawful to project a sound or noise from one property into another property within the bound- ary of the zoning district which exceeds the lim- iting noise spectra set forth in Table I below. (1) Sound or noise projecting from one dis- trict into another zonii different noise level sh, limits of the district int is projected. (2) The limits hereinabove be in accordance with tl TABLE I. APPLICABLE NOISE LIMITS Measurement period one-quarter hour (continuous), as measured at the receiving parcel. In multifamily developments (including duplex deve ment shall be taken from the receiving premises. district with a not exceed the which the noise :ferred to shall following table: boundary of the ), the measure - Level L(1). That noise (A -weighted sound level) exceeding one percent of a n equivalent to at least fifteen (15) minutes. Level L(10). That noise (A -weighted sound level) exceeding ten (10) percent ( time equivalent to at least fifteen (15) minutes. Level L(50). That noise (A -weighted sound level) exceeding fifty (50) percent c time equivalent to at least fifteen (15) minutes. *Residential developments within Agricultural Zoning Districts shall be subj level thresholds for the "Residential" Zoning Districts. Supp. No. 88 974/3 time a measurement a measurement to the decibel 163 Sound Level in Decibels A -Scale (DBA) Zoning District Day 6:00 a.m.-10.00 p.m. Night 10:00 p.m. -6: 0 a.m. L 1 L 10 L 50 L 1 L 10 L 50 Conservation 65 60 55 60 55 55 Residential 70 65 60 65 60 55 Commercial 1 75 70 65 70 65 60 Industrial 75 70 65 75 70 65 Agricultural* 75 1 70 65 75 70 65 Level L(1). That noise (A -weighted sound level) exceeding one percent of a n equivalent to at least fifteen (15) minutes. Level L(10). That noise (A -weighted sound level) exceeding ten (10) percent ( time equivalent to at least fifteen (15) minutes. Level L(50). That noise (A -weighted sound level) exceeding fifty (50) percent c time equivalent to at least fifteen (15) minutes. *Residential developments within Agricultural Zoning Districts shall be subj level thresholds for the "Residential" Zoning Districts. Supp. No. 88 974/3 time a measurement a measurement to the decibel 163