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Interior Noise All proposed buildings are required to be designed and constructed with a Sound Transmission Classification (STC) varying from 32 to 39 on their location on the project site for the walls, windows, and doors to ensure that interior noise levels would not exceed the 45 dB Ld„ noise standard. The applicant concurs with this finding and with the corresponding condition of approval. Exterior Noise The Pleasanton General Plan noise standard for outdoor areas in residential projects is 60 dBA Ld„ for single-family development and 65 dBA Ld„ for multi-family development. However, as stated in the Pleasanton General Plan: "...all residential areas cannot necessarily reach this goal due to economic or aesthetic considerations." Staff notes that aesthetic consideration for the proposed project wa; to maintain its openness to Valley Avenue and to the Bernal Community Park by not installing a perimeter sound wall, and to maximize its aesthetic appearance from 1-680. The proposed project would construct a 16-foot-tall combined earth berm (8-toot height) and a masonry noise wall (8-foot height) on Lot B in the southern portion of the site, and would construct an 8-foot-tall solid wood or masonry noise barrier between the buildings on Lots 50, 51, and 82 through 86 of the detached homes to mitigate the 1-680 traffic noise from the west and south sides of the project site. Staff supports these mea:aures in order for the project to achieve the outdoor noise standard. As a result, the combined noise mitigation of the apartment buildings plus the barrier and the private yard fences would reduce the estimated traffic noise from 1-680 to approximately 65 dB Ld„ or less. Staff believes that these limited areas of noise above the standard are preferable to excessive noise walls and, therefore, considers the proposed noise levels to be mitigated in compliance with the Pleasanton General Plan. Page 13 of 19