32Segundo Municipal Code, mitigation measure MM4.3 -5 would be
implemented, which requires the project applicant to submit
architectural plans and a detailed acoustical analysis study
(demonstrating that interior noise levels in all residential units
would be 45 dBA CNEL or less) for review and approval by the
City's Planning and Building Safety Department. Therefore, the
proposed project would not expose new residents to interior noise
levels in excess of established standards with implementation of
mitigation measure MM4.3 -5. However, no mitigation is available
to reduce existing exterior noise levels to a level that would be
considered acceptable for residential land uses. Implementation of
mitigation measures MM4.3 -6 and MM4.3 -7 would ensure that the
existing aviation easement remains in place and future residents
are informed of the potential annoyances associated with
proximity to LAX, respectively, but does not reduce excessive
exterior noise levels. Therefore, this impact would be significant
and unavoidable because the proposed project would expose
future residents to excessive exterior noise levels due to the
project site's proximity to LAX.
b) Mitigations:
MM4.3 -5 Residential units must be designed and constructed to
ensure that interior noise levels from exterior transportation
sources — including aircraft and vehicles on adjacent roadways —
cannot exceed 45 dBA CNEL. In order to ensure that all dwelling
units achieve an adequate noise reduction to achieve an interior
noise level of 45 dBA CNEL, the following features must be
included in the building design and construction of all dwelling
units: (1) upgraded dual - glazed windows, (2) mechanical
ventilation /air conditioning, (3) exterior wall /roof assemblies free of
cut -outs or openings, and (4) ceiling insulation in the top floor of
each building to reduce aircraft noise by at least 20 dBA. Before a
building permit is issued, the developer must submit architectural
plans and a detailed acoustical analysis study prepared by a
qualified acoustical consultant demonstrating that interior noise
levels in all residential units would be 45 dBA CNEL or less to the
Planning and Building Safety Department for review and approval.
MM4.3 -6 The ESUSD must make as a condition of sale of the
proposed project site, that the future owner express
acknowledgement and confirmation of the continuing applicability
of the existing aviation easement for noise, vibrations, and fumes
over the proposed project site property. Notice must include the
following language:
"NOTICE OF AIR EASEMENTS – This property is subject
to air easements that may affect your property rights.
Such air easements are recorded with the Los Angeles
County Recorder's Office as Document No. 80- 55139."
MM4.3 -7 In accordance with the Business and Professions Code
and Civil Code each prospective purchaser of residential property
22