point cover jan 13 - Boston Redevelopment Authority

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\\MABOS\projects\11381.00\reports\Article80\ Expanded_PNF\04_Environmental_FINAL.do c Vanasse Hangen Brustlin, Inc. The Point, Boston federal and state databases and municipal files regarding the use, storage or release of OHM on or near the subject property. As part of the Phase II investigation, chemical testing of groundwater was performed. In summary, the Phase I/II assessments did not indicate the presence of Recognized Environmental Conditions (RECs) with respect to the subject property. It is currently anticipated that construction of the proposed building will require excavation and off-site disposal of an unknown quantity of existing soil. Disposal of excavated soil will be conducted in accordance with the current policies of the Massachusetts DEP. Chemical testing will be performed as needed to reuse/ dispose of the soils off-site depending on the acceptance criteria of specific facilities. In addition, procurement of a temporary groundwater dewatering discharge permit from the Environmental Protection Agency (EPA), DEP, and Boston Water and Sewer Commission will be required for pumping and discharge of site groundwater from within the steel sheetpile cofferdam to be installed prior to excavation. Noise The purpose of the noise evaluation is to assess potential Project-related noise associated with potential rooftop mechanical equipment and loading activities. The noise analysis included noise monitoring to determine existing sound levels and calculations of future sound levels associated with potential mechanical equipment. The following section discusses noise background, the City of Boston’s noise standards, noise analysis methodology, and a comparison to the City’s noise criteria. Summary of Key Findings The noise analysis determined that the maximum sound levels that the Project may generate comply with the City of Boston’s noise standards at the sensitive receptor locations. The Project will not generate noise levels that exceed the City’s noise criteria during the daytime and nighttime period, respectively. The rooftop mechanical equipment has been strategically located on the roof in a mechanical room of the proposed building (Levels 23 and 24). Additionally, during the selection process of the rooftop mechanical equipment, the Proponent will select equipment (including any necessary mitigation measures) that would result in sound levels that do not exceed the maximum sound levels determined in this evaluation. Since majority of the service and loading activities will be serviced on-site and within the proposed building, noise impacts to the sensitive receptor locations will be negligible. Noise Background Noise is defined as unwanted or excessive sound. Sound becomes unwanted when it interferes with normal activities such as sleep, work, or recreation. How people perceive sound depends on several measurable physical characteristics. These factors include: Intensity - Sound intensity is often equated to loudness. 4-28 Environmental Protection
\\MABOS\projects\11381.00\reports\Article80\ Expanded_PNF\04_Environmental_FINAL.do c Vanasse Hangen Brustlin, Inc. The Point, Boston Frequency - Sounds are comprised of acoustic energy distributed over an array of frequencies. Acoustic frequencies, commonly referred to as tone or pitch, are typically measured in Hertz. Pure tones have all their energy concentrated in a narrow frequency range. Sound levels are most often measured on a logarithmic scale of decibels (dB). The decibel scale compresses the audible acoustic pressure levels which can vary from the threshold of hearing (0 dB) to the threshold of pain (120 dB). Because sound levels are measured in dB, the addition of two sound levels is not linear. Adding two equal sound levels creates a 3 dB increase in the overall level. Research indicates the following general relationships between sound level and human perception: A 3 dB increase is a doubling of acoustic energy and is the threshold of perceptibility to the average person. A 10 dB increase is a tenfold increase in acoustic energy but is perceived as a doubling in loudness to the average person. The human ear does not perceive sound levels from each frequency as equally loud. To compensate for this phenomenon in perception, a frequency filter known as A-weighted [dB(A)] is used to evaluate environmental noise levels. Table 4-8 presents a list of common outdoor and indoor sound levels A variety of sound level indicators can be used for environmental noise analysis. These indicators describe the variations in intensity and temporal pattern of the sound levels. The following is a list of sound level descriptors: Lmin is the minimum sound level measured during the time period. L10 is the sound level which is exceeded for 10 percent of the time during the time period. During a 100 minute period, the L10 would be the sound level which was exceeded by other sound levels for 10 minutes. L90 is the sound level which is exceeded for 90 percent of the time during the time period. The L90 is generally considered to be the ambient or background sound level. Lmax is the maximum sound level measured during the time period. 4-29 Environmental Protection
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point cover jan 13 - Boston Redevelopment Authority

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