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Section 4.0 – Environmental Setting and Discussion of Impacts <br /> <br /> <br />City of Redwood City 79 Initial Study/Mitigated Negative Declaration <br />Sandpiper Elementary School Facilities Expansion November 2016 <br />outdoor school activities with the higher student population would, therefore, increase by 1.6 dB. As <br />discussed in Section 4.16, Transportation, the additional students and staff resulting from the project <br />would not cause traffic volumes on local roadways to double. The project would have no effect on <br />other ambient noise levels, including noise from activities at Sandpiper Park, activities in the <br />neighborhood, or noise from aircraft overflights. The project would not cause all noise sources to <br />double and would result in a less than three dB increase in noise levels. The project would not <br />substantially (five dB) increase noise levels resulting in a significant noise impact. (Less Than <br />Significant Impact) <br /> <br />4.12.3.4 Noise and Vibration Impacts to the Proposed Project (Checklist Questions 1, 2, 5, <br />and 6) <br /> <br />As shown on the General Plan Noise Contour Map, ambient noise levels on the project site in the <br />area of the proposed improvements are approximately 55 dBA Ldn and within the General Plan <br />Noise Compatibility Guidelines for public facilities and schools. Sandpiper Elementary School is <br />located approximately 1.5 miles northeast of the San Carlos Airport. The school is not within the <br />airport’s 55 dBA noise contour.30 There are no other private or public airports in the project area. <br />The project site is not located near train tracks or other sources of groundborne vibration. For these <br />reasons, the proposed project would not expose students, faculty and staff on the project site to <br />excessive noise and vibration levels. (Less Than Significant Impact) <br /> <br />4.12.4 Conclusion <br /> <br />The proposed project, implemented in accordance with existing General Plan policies and programs, <br />would not result in a significant noise impact. (Less Than Significant Impact) <br /> <br />30 City of Redwood City. Redwood City General Plan Draft Environmental Impact Report. May 2010. <br />7.A. - Page 110