Laserfiche WebLink
<br /> <br />ͭͲͱͱʹ-ͬͰ Noise Memo.docx ͭͰ Warner Avenue Footlab <br />TABLE 6: CONSTRUCTION EQUIPMENT NOISE LEVEL SUMMARY <br />Receiver <br />Location1 <br />Construction Noise Levels (dBA Leq) <br />Site <br />Preparation Grading Building <br />Construction Paving Architectural <br />Coating <br />Highest <br />Levels2 <br />R1 61.1 60.4 58.2 55.0 56.9 61.1 <br />R2 60.5 59.8 57.6 54.4 56.3 60.5 <br />R3 59.5 58.8 56.6 53.4 55.3 59.5 <br />1 Construction noise source and receiver locations are shown in Exhibit 5. <br />2 Construction noise level calculations based on distance from the construction activity, which is measured from <br />the Project site boundary to the nearest receiver locations. CadnaA construction noise model inputs are <br />included in Appendix C. <br />CONSTRUCTION NOISE COMPLIANCE <br />To evaluate whether the Project will generate potentially significant short-term noise levels at <br />nearest receiver locations, a construction-related daytime noise level threshold of ʹͬ dBA Leq is used <br />as a reasonable threshold to assess the daytime construction noise level impacts. The construction <br />noise analysis shows that the nearest receiver locations will satisfy the reasonable daytime ʹͬ dBA <br />Leq significance threshold during Project construction activities as shown in Table ͳ. Therefore, the <br />noise impacts due to Project construction noise are considered less than significant at all receiver <br />locations. <br />TABLE 7: CONSTRUCTION NOISE LEVEL COMPLIANCE <br />Receiver <br />Location1 <br />Construction Noise Levels (dBA Leq) <br />Highest <br />Construction <br />Noise Levels2 <br />Threshold3 Threshold <br />Exceeded?4 <br />R1 61.1 80 No <br />R2 60.5 80 No <br />R3 59.5 80 No <br />1 Construction noise source and receiver locations are shown in Exhibit 5. <br />2 Highest construction noise level calculations based on distance from the construction noise source activity <br />to the nearest receiver locations as shown in Table 6. <br />3 Construction noise level thresholds based on FTA Guidance, 2018. <br />4 Do the estimated Project construction noise levels exceed the construction noise level threshold? <br />CONSTRUCTION VIBRATION ANALYSIS <br />Construction activity can result in varying degrees of ground vibration, depending on the <br />equipment and methods employed. Operation of construction equipment causes ground <br />vibrations that spread through the ground and diminish in strength with distance. Ground <br />vibration levels associated with various types of construction equipment are summarized in <br />Table 8. Based on the representative vibration levels presented for various construction <br />equipment types, it is possible to estimate the potential for human response (annoyance) <br />and building damage using the following vibration assessment methods defined by the FTA. <br />To describe the vibration impacts, the FTA provides the following equation: PPVequip = PPVref <br />x (25/D)1.5 <br />