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Pleasanton Gateway- Environmental Checklist Less Than Significant Potentially Impact With Less Than Significant Mitigation Significant No Issues Impact Incorporated Impact Impact Noise Would the project: a) Exposure of persons to or generation of noise levels in 1 X I L_I excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? b) Exposure of persons to or generation of excessive Li 1 X ground borne vibration or ground borne noise levels? c) A substantial permanent increase in ambient noise C_ I x I L— levels in the project vicinity above levels existing without the project? d) A substantial temporary or periodic increase in P1 LXJ L ambient noise levels in the project vicinity above levels existing without the project? e) For a project located within an airport land use plan or, L X where such a plan has 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) For a project within the vicinity of a private airstrip, L _ would the project expose people residing or working in the project area to excessive noise levels? Discussion a -b) The ambient noise level for the site varies from 70 dBA Ld at the edge -of- pavement on Valley Avenue to 80 dEtA L at the site's boundary line with the 1- 680. This ambient noise level is considered to be "Conditionally Acceptable" for "Office Buildings, Business Commercial, and Professional" land uses — 70 dBA Ld to 80 dBA L — by the 2005 — 2025 Pleasanton General Plan'. Standard commercial /office building construction can achieve a 15 dB to 20 dB reduction in interior noise levels, thereby achieving the 60 dBA Ld interior noise standard of the Pleasanton General Plan'. Therefore, this would be a less than - significant- impact. c) The Bernal Property Specific Plan and Final EIR required the construction of commercial /office buildings on the Pleasanton Gateway property, at a minimum 19 -foot building height, to mitigate the noise impacts from the 1 -680 freeway to the residential developments on the east side of Valley Avenue. As stated in the Pleasanton General Plan, construction of an eight -foot tall noise barrier on the 1- 680 property line will move the 60 dBA Ld noise contour line to the approximate Page 42 of 52 Pleasanton Gateway Initial Study August 2, 2010