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retail /commercial project will change the type of trips attracted to the site and attract some retail trips that otherwise would have had to travel farther. Retail uses also generally have lower utility usage than office, which factors into lower total GHG emissions. Of great significance is the 362 metric ton decrease of CO emissions per year for the proposed project compared to the office project. This will result in a significant net reduction in the GHG emissions anticipated for this development. From a Greenhouse Gas perspective, therefore, the proposed project is an improvement over the previous office only project. Archaeological Resources The site was subject to a field investigation conducted in 1988 that identified an archaeological resource, designated as CA -Ala -554, in the approximate area east of 1 -680 near Bernal Avenue. The 1988 field investigation was updated by the project applicant most recently in 2008. All field investigations were conducted in conformance to the California Environmental Quality Act and with a Native American Representative designated by the California Native American Commission present during all sub - surface investigations. The applicant is conditioned to submit an archeological mitigation program prepared by a licensed archaeologist with input from the Native American Representative before the City will issue the first grading /on -site permit, and will implement the requirements and measures of this program to the City's satisfaction and shall submit periodic status reports to the City of Pleasanton and to the Native American Heritage Commission. A qualified archaeologist and the Native American Representative designated by the Native American Heritage Commission shall be present on site during the grading and trenching for the foundation(s), utility services, or other on -site excavation, in order to determine if any bone, shell, or artifacts are uncovered. If human remains are discovered, the applicant will stop the site work immediately, and the archaeologist and the Native American Heritage Commission and or their representative will be consulted to develop the suitable mitigation measures. 1 -680 Noise The ambient noise level for the Pleasanton Gateway site varies from 70 dBA Ld at the edge -of- pavement on Valley Avenue to 80 dBA Ld at the site's boundary line with the 1- 680. This noise level is considered to be "Conditionally Acceptable" for "Office Buildings, Business Commercial, and Professional" land uses — 70 dBA Ld to 80 dBA Ld — 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 Ldn interior noise standard of the Pleasanton General Plan. 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 L noise contour line to the approximate north /south midpoint of the site's interior. The Final EIR for the Bernal Property Specific Plan specified a minimum 19 -foot tall barrier to mitigate the noise impacts from 1 -680 to the residential developments on the east side of 'Valley Avenue — the eight office buildings were approved as the noise mitigation measure of the Final EIR without constructing a Pleasanton Gateway Page 30 of 35 August 25, 2010