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a. Adjustments to Attenuation Requirements for Emergency Generators. The Zoning Enforcement Official, in reviewing a request for a building or electri- cal permit for the installation of an emergency generator (such as one to be used during temporary power outages or in similar limited use situations), may adjust or reduce the requirements for noise attenuation to correspond to the duration, frequency or intensity that the generator is to operate. 4. Required Separation/Mitigation Adjacent to Residential Parcel. Either a land- scaped buffer and/or a masonry wall shall be provided along rear and side prop- erty lines, which are adjacent to residential parcels, as required as part of an ap- proved Site Development Plan per Article 25. a. Option of Yard Setback. In cases where a building would otherwise be per- mitted with no rear or side yard setback, a minimum side and/or rear yard of ten (10) feet shall be provided, which shall be used exclusively for the plant- ing of a landscape screen. Evergreen trees with spacing not to exceed twen- ty (20) feet, and of a minimum fifteen (15) gallon size, shall be provided with- in the required yard. Tree selection shall provide for a near total screen, up to a height of twenty (20) feet within five (5) years from planting. Such land- scaping shall be permanently maintained. b. Option of Masonry Wall. A minimum eight (8) foot high wall shall be provided adjacent to residential parcels, as required by Section 4-1642, or as high as required by acoustical analysis (to be provided by applicant), when a vacant industrial parcel is developed or an existing use is expanded so as to signifi- cantly increase the potential for additional traffic and/or noise impacts to the residential areas. A wall will typically be required whenever an active ser- vice, staging and/or storage yard is immediately adjacent to a residential parcel. (Ord. 2001-015 § 1) 2-741 Parcels Adjoining Residential Districts—Additional Performance Standards A. Intent. The purpose of this section is to reduce the potential noise impacts to the resi- dents within adjoining Residential Districts, from late night/early morning activity, by establishing performance standards for all businesses. B. Applicability. The requirements of this Section apply to activities within two hundred (200) feet from the edge of a Residential District. The requirements of this Section do not apply to industrial parcels that are separated from a Residential District by either an active mainline railroad right-of-way or Interstate 880. C. Performance Standards for Loading and Shipping Activity. To reduce impacts on ad- joining residents, those uses conducting loading and shipping activity between the hours of 10:00 p.m. and 7:00 a.m. shall avoid generating extraneous noise that can Exhibit D: Proposed Amended Article 7 Page 30 Note: underline and bolded text represents new text; strike-through text represents text to be eliminated