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Acoustical Analysis Report Griffith Energy Storage Project <br /> 5.0 VIBRATION CALCULATION METHODOLOGY <br /> Vibration levels for activities associated with Project construction were based on the average of <br /> source levels in PPV published with the Federal Transit Administration (2006) Noise and Vibration <br /> Manual,which documents several types of construction equipment measured under a wide variety of <br /> construction activities. Using the documented vibration levels as input into a basic propagation <br /> model,construction vibration levels were calculated at the nearest Project site boundary and then at <br /> the NSA structure. <br /> 5.1 Projected Vibration Levels During Construction <br /> As discussed in Section 4.2, Project construction would be completed in five work stages.This <br /> vibration analysis evaluated the worst-case vibration source,which would be the pile driver. Based on <br /> vibration propagation calculations,construction vibration levels are predicted to be 0.00255 PPV <br /> in/sec,or 56 VdB,at the nearest non-participating residential receptor,which is approximately 1,000 <br /> feet from the site.These levels are based on the worst-case vibration producing equipment and it is <br /> expected that other vibration generating equipment proposed for the Project construction would <br /> result in lower vibration levels.Vibration levels at the nearest non-participating sensitive receptor will <br /> be below the minimum vibration level for human perception of 65 VdB. <br /> OTETRA TECH 12 August 2023 <br />