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<br /> <br /> <br />Memorandum <br />February 26, 2025 <br />Page 6 <br />21202-23 North County Landfill_Noise DRAFT <br />REGULATORY FRAMEWORK <br />Federal Transit Administration <br />The Federal Transit Administration (FTA) has developed vibration thresholds to prevent <br />disturbances to (i.e., annoyance of) building occupants based on the frequency of a vibration <br />event.3 Vibrations that are equal to or exceed the vibration thresholds could result in potential <br />disturbance to people or activities. The FTA thresholds of 80 VdB and 83 VdB for infrequent <br />events4 are used in this analysis to evaluate disturbance to residences and buildings where <br />people normally sleep and to institutional land uses with primarily daytime use (such as schools <br />and library), respectively. <br />The FTA has also developed vibration thresholds based on PPV values to evaluate the potential <br />impact of construction vibration on structures. Construction vibrations that are equal to or <br />exceed the vibration thresholds could result in potential damage to structures. The FTA <br />threshold of 0.2 in/sec PPV for non-engineered timber and masonry buildings is used to <br />represent the building types near the project site and along the haul route based on the <br />apparent age of the buildings. <br />San Joaquin County Noise Ordinance <br />San Joaquin County regulates noise via the County’s noise ordinance (Code of Ordinance <br />Chapter 9-404). Chapter 9-404.040 establishes standards for noise from transportation sources <br />and stationary sources, as presented in Tables 3 and 4, respectively. For transportation sources, <br />the noise ordinance chapter 9-404.040.(a) requires private development projects involving new <br />or expanded transportation facilities to mitigate noise levels that exceed the standards <br />specified in Table 3. For stationary noise sources, the noise ordinance chapter 9-404.040.(b) <br />requires projects involving new or expanded stationary noise sources to mitigate noise levels <br />that exceed the noise level standards specified in Table 4. <br />Table 3. San Joaquin County Maximum Allowable Noise Exposure from Transportation <br />Noise Sources <br />Noise Sensitive Land Use Outdoor Activity Areas1 <br />(dBA Ldn) <br />Interior Spaces <br />(dBA Ldn) <br />Residential 65 45 <br />College and Trade School 65 45 <br />Commercial Use Types not separately listed - 45 <br /> <br />3 Federal Transit Administration (FTA), 2018. Transit Noise and Vibration Impact Assessment Manual, FTA Report <br />No.0123, September. <br />4 Infrequent events = less than 30 events per day. The “infrequent events” threshold is appropriate for off-road <br />equipment in this analysis based on the nature of the landfill operational activities.