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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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holidays) when noise intrusion is less disruptive. The local noise ordinance <br />specifies which hours each day construction activities can occur. <br />Federal Standards: The "Federal Highway Program Manual" (FHPM 7 -7 -3) <br />requires that land use activities which may be affected by highway construction <br />noise be identified. In addition, the measures needed in the plans and speci- <br />fications to minimize or eliminate construction noise impacts must be <br />determined. However, no specific guidelines are available for assessing the <br />significance of construction noise impacts. <br />The 1981 California Standard Specifications Section 7- 1.0IN, Section 42 -1.02, <br />and Section 42 -2.02 (as shown in the Appendix) and Standard Caltrans Special <br />Provisions Section 5 -1 (Sound Control Requirements) may be referenced in <br />the project plans and specifications when they apply to minimise or eliminate <br />construction noise impacts. A diagram illustrating various construction noise <br />control strategies developed by Caltrans is included on page 18 of the <br />Appendix to the Technical Appendix. <br />Lonaerm Acoustic Impacts <br />Daily traffic data for future conditions with and without the project was <br />provided by Willdan Associates. The findings of the traffic study indicate that <br />daily traffic volumes would not change with the proposed project versus the <br />no- project alternative. However, traffic congestion along Bristol Street would <br />decrease, and a consistent set of improvement standards would also improve <br />safety and other operational characteristics. <br />Future noise levels within the project area, expressed as contour lines at <br />varying distances from the centerline of the roadway, were projected by <br />employing the FHWA RD -77 -108 Highway Traffic Noise Prediction Model. <br />Noise contours serve as a planning tool for local agencies to assist in future <br />land use decisions on undeveloped sites and to help select sensitive receptor <br />sites for analysis of traffic noise impacts. Noise emission levels were obtained <br />from National Reference Energy Mean Emission Levels as a Function of <br />Speed (per paragraph 14 of FHPM 7 -7 -3). The posted speed limit was <br />assumed to be representative of future mid -block conditions with the proposed <br />project and the no- project scenarios as a "worst case" assumption. A 2.58 <br />percent truck mix was assumed along Bristol Street. <br />City Standards: Table 16 shows the community noise equivalent levels which <br />can be expected adjacent to each roadway link within the project area for <br />design year (2006) conditions with the proposed project and the no- project <br />alternative. As shown, future noise levels adjacent to Bristol Street will be <br />higher with the proposed project than with the "no- build" alternative because <br />of the wider pavement width. The increase would amount to 1 dBA or less. <br />IV -23 <br />75C -158 <br />
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