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<br />MacArthur Place South Findings and Facts in Support of Findings <br />Environmental Impact Report <br /> <br />Implementation of mitigation measures N-l, N-2, N-3, and N-12 and project enhancement <br />measures N-4, N-5, N-6, N-7, N-8, N-9, N-10 and N-ll provided below, would substantially <br />lessen the adverse impacts of the MacArthur Place South project related to noise impacts, and <br />would reduce potentially significant adverse noise impact to below a level of significance. <br /> <br />N-l Prior to issuance of building permits, building plans shall reflect the construction of noise <br />barriers around patios and balconies that are considered open space by the City of Santa <br />Ana. The barriers shall be constructed of materials that provide a surface density of at <br />least four pounds per square foot and shall be continuous (without gaps or gates). The <br />height of the barriers shall be sufficient to reduce the exterior noise level to a CNEL of 65 <br />dB or less, and shall be determined by a qualified acoustical consultant as part of he final <br />engineering design of the project. <br /> <br />N-2 Prior to issuance of building permits, building plans shall specify the STC rating of <br />windows and doors for all residential uses. Window and door ratings shall be sufficient to <br />reduce the interior noise level to a CNEL of 45 dB or less, and shall be determined by a <br />qualified acoustical consultant as part of the final engineering design of the project. <br /> <br />N - 3 Prior to building occupancy, mechanical ventilation shall be installed at the proposed <br />condominiums and residential towers since the interior CNEL standard of 45 dB is to be <br />met with all windows and doors closed. <br /> <br />N-4 Prior to building occupancy, to the extent possible, all equipment shall be enclosed within <br />a building or separate structure. Where this is not possible, barriers may be necessary to <br />shield the equipment from the existing and proposed residential buildings. Depending on <br />the size and style of the equipment, silencers in the intake and exhaust ducts may also be <br />necessary to reduce noise at the residential buildings to an acceptable level. <br /> <br />N-5 Upon project completion, truck deliveries to the restaurant and the retail building shall be <br />restricted to the hours of7:00 a.m. to 10:00 p.m. Delivery trucks shall not be permitted to <br />idle in the parking lots or loading areas and shall be required to have properly maintained, <br />factory approved mufflers. Delivery truck drivers shall be encouraged to minimize <br />acceleration and maintain reduced vehicle speeds while onsite. <br /> <br />N-6 Demolition and construction plans for the proposed project shall reflect the following <br />note: "During demolition and construction, the contractor shall adhere to all City Noise <br />Ordinance requirements to limit all construction activity, including equipment start-up, to <br />between the hours of 7:00 a.m. and 8:00 p.m. Mondays through Saturdays. No <br />construction shall take place on Sundays or federal holidays. <br /> <br />N-7 During demolition and construction, the contractor shall site all construction staging and <br />storage areas away from sensitive receptors to the furthest extent possible. <br /> <br />N-8 During construction activities, the project developer shall ensure that all pile driving <br />equipment shall be enclosed on all sides with an acoustical blanket barrier that provides a <br />m.inimum sound transmission class (STC) rating of 30. The height of the blanket <br /> <br />Exhibit B <br />Page 22 of 38 <br /> <br />Page 22 <br />