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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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After the widening of Bristol Street, some of the measurement locations would <br />fall within the right -of -way for some of the project alternatives. Calculations <br />of future noise levels were not included for alternatives where the noise <br />impacted structure is being removed. Since the front edge of the residential <br />dwellings adjacent to measurement site No. 7 are on the right -of -way for <br />alternative 2, there is no room for a noise barrier, and no barrier attenuation <br />calculations were made. Finally, barrier attenuation calculations were not <br />made for "no- mitigation" noise levels at or below 63 Leq. <br />The noise impact from Bristol Street on residential areas falls into several <br />categories. Many dwellings front onto Bristol Street with access directly onto <br />Bristol Street, or with access to an alley in the back. The front yard noise <br />impacts could be mitigated by constructing a barrier at the right -of -way, <br />however pedestrian or pedestrian and vehicular access may be restricted by <br />construction of a contiguous noise barrier. <br />Dwellings with the side yard facing Bristol Streei typically have front yard <br />impacts. However, construction of a 6 -foot block wall protecting the front <br />yard may reduce the visibility of motorists approaching Bristol Street and may <br />also have aesthetic impacts. Several dwellings with side yards facing Bristol <br />Street have rear yards enclosed by chain link fencing. The noise impacts on <br />these rear yard activity areas will be similar to front yard impacts, but access <br />conflicts will not be a consideration. Construction of a perimeter 6 -foot block <br />wall at the right -of -way would reduce noise levels to acceptable levels at these <br />units. <br />Several alternatives include taking a <br />playgrounds. For alternatives where <br />within the right -of -way, the measuremc <br />ten feet behind the future right -of -way. <br />portion of school activity fields or <br />the noise measurement location was <br />ats were adjusted to reflect conditions <br />Second line receptors (i.e., receptors impacted when abutting structures are <br />removed) are often of concern adjacent to freeways, but are generally not <br />severely impacted in local roadway widening projects. Measurements at sites <br />12, 12A, 13, and 13A were made to assess the front and back yard impacts on <br />a typical worst -case second line receptor. <br />A field review of the sensitive noise receptors located adjacent to Bristol <br />Street within the project area indicates exceedances of federal exterior noise <br />criteria for approximately 167 front yard activity areas. Of these dwellings, 68 <br />front onto Bristol Street with direct vehicular access, and 99 have vehicular <br />access to a rear alley or to a side street. In addition, seven of these dwellings <br />have noise impacts in rear yard activity areas (six yards surrounded by chain <br />link and one with no fencing). <br />IV -27 <br />75C -162 <br />
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