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75C - PH - BRISTOL EIR FROM WARNER TO ST. ANDREW
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75C - PH - BRISTOL EIR FROM WARNER TO ST. ANDREW
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Last modified
4/8/2015 3:32:45 PM
Creation date
4/2/2015 4:21:45 PM
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City Clerk
Doc Type
Agenda Packet
Agency
Public Works
Item #
75C
Date
4/7/2015
Destruction Year
2020
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N'1 <br />Measurement Site 11 was located adjacent to an elementary school outdoor <br />activity area 8 feet from the right -of -way. The barrier analysis assumed that <br />the sensitive receptor was located 10 feet behind a wall constructed at the <br />right -of -way. As shown in Table 18, a 6 -Foot barrier constructed at the right- _ <br />of -way will be adequate to achieve acceptable noise levels. <br />Measurement Sites 12, 12A, 13, and 13A were located north of St. Gertrude <br />Place. Sites 12 and 12A represent front and back yard front line receptor <br />locations respectively. Similarly, sites 13 and 13A represent front and back <br />yard second line receptor locations. For alternatives 1 and 2, the house <br />adjacent to sites 12 and 12A will be removed, increasing noise levels at site 13 <br />(located 108 or 85 feet from the Bristol Street centerline for 104 feet from the <br />centerline). Both first and second line rear yard receptors were sheltered by a <br />wooden fence with visible gaps. The noise attenuation of the wooden fences <br />was calculated to be 4 dBA. As shown in Table 18, the noise impacts at the <br />rear yard actiyity areas do not warrant additional mitigation. <br />As shown in Table 18, the second line rear yard receptor (site 13A) would not <br />require additional mitigation with any of the alternatives with the existing <br />fence. However, because of the uncertain nature of the fence, future noise <br />levels should be addressed without that fence. In that case, this second -line <br />receptor would have future noise impacts and require noise walls as shown in <br />Figure 19. <br />The front yard noise impacts for the first line receptor (site 12) and for the <br />second line receptor (site 13) when the first line house is removed, are typical <br />impacts associated with a house facing a side street. Although a 6 -foot block <br />wall would reduce noise impacts, a wall extending out to the comer would <br />reduce the visibility of motorists on St. Gertrude Place and Bristol Street. <br />Although the noise attenuation from a 6 -foot barrier placed at the right -of- way <br />(60 feet from the centerline) in front of dwellings fronting on Bristol Street is <br />evaluated in Table 18, construction of a wall may prove infeasible. For most <br />of these dwellings, noise barriers will conflict with existing driveways, <br />pedestrian access, or reduce vehicular sight distances at comers. Construction <br />of a non - contiguous wall would lower noise levels behind the wall but would <br />reduce the effectiveness of the noise barrier such that the Caltrans minimum <br />effectiveness criteria would not be met <br />Figure 19 depicts which residences appear to be noise impacted by future <br />traffic volumes projected for Bristol Street with or without each of the <br />proposed project alternatives. Figure 19 also indicates whether front yard <br />exterior impacts are anticipated, and where fast and second line noise barriers .. <br />may be constructed. Parcels affected by the preferred alternative are outlined <br />for emphasis. The barriers proposed will mitigate noise below the federal — <br />IV -32 <br />75C -167 <br />
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