A. Boundaries of Noise District. The boundaries of the Noise Impact Overlay District are as set forth in Figure 20.520-1. Such boundaries delineate that part of the city which is most affected by noise from Portland International Airport, Burlington Northern Railroad, I-5 freeway and Pearson Airpark, or by the combined effect thereof. Such boundaries are based upon the 1988 65 Ldn Noise Contour shown on the 1983 PIA Noise Abatement Plan and are consistent with the noise impact studies of the Washington State Department of Transportation for the I-5 corridor. Large-scale maps showing the boundaries of the district shall be maintained in the office of the city’s community development department. For lots or parcels located only partially within the district, this chapter shall apply if all or part of the exact building site is within the district.

B. Amendment of boundaries. The boundaries of the district hereby created shall be deemed amended whenever such boundaries are found by the Planning Official to require reasonable amendment to comply with the new noise impact standards thereinafter established; provided, in any case where the planning official finds it necessary to so amend such boundaries, his action may be appealed to the planning commission by any affected property owner or prospective purchaser by means of a Type III procedure, as governed by VMC 20.210.060. (Ord. M-4402 § 3(O), 2023; Ord. M-3832 § 11, 2007; Ord. M-3643, 2004)