ORD 1814A - Laserfiche WebLink

68. 69. ~ at the time a tentative map is reviewed and approved for these lots. (c) UPRR Soundwalls. Property Owner shall be allowed to construct an eight-foot high soundwall on the east side of the UPILR railroad track right-of-way south of the Valley Avenue underpass, as shown on Figure 6-1, Noise Mitigation Measures Policy Diagram, of the Bernal Property Specific Plan. The soundwall on the east side of the railroad tracks may be constructed commensurate with any residential use within the Eastern Area. Commercial Uses as a Noise Buffer. Commercial buildings shall provide noise attenuation for residential uses in the northwestern portion of the Central Ama. Should residential use within the Central Parcel occur prior to construction of the commercial structures, development of such residential uses may proceed as scheduled, and noise conditions shall be considered as an interim impact that does not require additional mitigation. Subsequent Noise Studies Required. Following construction of soundberms and soundwalls as set forth in Condition 67, noise levels in certain portions of the Project are projected to remain in excess of 65 dBA Ldn. In such areas, as shnwn in Figure 6-1, Noise Mitigation Measures Policy Diagram, of the Bernal Property Specific Plan, the following shall apply: (a) Residences with ambient noise levels of 65 dBA Ldn or higher following the construction of noise attenuation barriers as shown in Figure 6-1 of the Bernal Property Specific Plan shall use building construction techniques to :'educe noise to the extent feasible, where outdoor use is a major consideration (e.g., backyards in single-family residential areas and recreational areas in multi-family residential areas), consistent with other Specific Plan goals. (b) Residences lha! abut the open space and that are affected by a roadway sound source may be subject to ambient noise levels following construction of noise atrenuation barriers without further extcrior noise mitigation as described above being required. (c) For residential uses in areas where the noise source from a railroad (e.g., along the UPRR tracks) exceeds a maximum train pass-by level of 75 dBA, interior noise shall be limited to a maximum instantaneous noise level of S0 dBA in bedrooms and 55 dBA in other rooms throu~a a combination of soundwall and building construction techniques. Conditions of Approval Page 42 of 49 Revised August 21,2000