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LSA ASSOCIATES,INC. L STUDY /ENVIRONMENTAL- /ENVIRONMENTAL DOCUMENTATI JULY 200o ON STOCKTON METROPOLITAN AIRPORT SPECIAL PURPOSE PIAN reduced from 70 per day in the Master Plan to 27 per day in the Special Purpose Plan. It would be expected that there would be a concurrent reduction in aircraft- related noise conditions. Accordingly, implementation of the Special Purpose Plan will not have an adverse effect on aircraft-related noise conditions. In light of the County's Noise Ordinance requirements, and despite the fact that the Special Purpose Plan does not result in substantive changes to the previous Master Plan EIR findings, future sensitive Iand uses within the Airport area may be impacted by mobile and/or stationary noise sources. The Noise Ordinance specifies land uses considered sensitive, including administrative office, lodging services , professionaI services and public services. Except for lodging services, the Ordinance specifies that the interior spaces must have a maximum allowable noise exposure of 45 dB Ldn. Modern building materials and techniques would provide sufficient F exterior to interior noise attenuation to meet that standard. For lodging services or other sensitive uses, a site must meet the maximum exterior allowable noise exposure of 65 dB Ldn,with or without attenuation. Compliance with the County's Noise Ordinance will be sufficient to adequately attenuate noise for sensitive land uses. b) Exposure of persons to or generation of excessive groundborne vibration or groundborne noise levels? No impact. The proposed project will not expose persons to or generate excess groundborne vibration or groundborne noise levels. Except for aircraft operations that were addressed in the Master Plan EIR,the project does not have any features that generate excessive groundborne vibrations or noise levels. The i commercial/retail,office/research and development and warehouse/distribution uses proposed in the Special Purpose Plan are not expected to generate excessive groundborne vibrations or noise levels. C) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? FLess than significant impact. As mentioned in (a)above,traffic-related noise conditions are not expected to significantly change the cumulative noise conditions. Aircraft-related noise is expected to be less than forecast in the Master Plan. d) A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? Less than significant impact. While i g p t is expected that there will be temporary increases in noise due to construction equipment as expressed in the Master Plan EIR,there are no sensitive receptors in the vicinity that will be affected. e) For a project located within an airport land use plan or,where such a plan has F' not been adopted,within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? F! Less than significant impact. As mentioned in(a) and (d) above, traffic and aircraft- related noise associated with the Special Purpose Plan will not affect persons residing or working in the area. 7120/00(P:1SJC03O EnvironmentaIVnitial study.wpd) 42