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 Street, Peterborough Street, Riverway, and Park Drive. The maximum sound levels from the rooftop mechanical equipment served as a criterion during the selection of the specific rooftop mechanical equipment. The specifications for the specific rooftop mechanical equipment, with any appropriate mitigation measures, such as acoustical noise walls, equipment locations, and enclosures will be designed to meet the calculated maximum sound levels. The noise analysis also evaluated noise associated with loading activities from the Project. The analysis examined the building design, such as location of the loading area, and management of deliveries at the Project Site. Receptor Locations The noise analysis included evaluation of the study area to identify sensitive receptor locations that have outdoor activities and that might be sensitive to noise associated with the Project. The noise analysis identified seven sensitive receptor locations in the vicinity of the Project Site. The analysis evaluated the following receptor locations: R1 – Trilogy; R2 – 137 Peterborough Street; R3 – 100 Riverway; R4 – 449 Park Drive; R5 – 1330 Boylston Street; R6 – 138 Peterborough Street; and R7 – 235 Park Drive. These receptor locations, selected based on land use considerations, represent the most sensitive locations in the vicinity of the Project site. Figure 4.5 depicts the receptor locations used in the noise analysis. Existing Conditions A noise monitoring program was conducted to establish existing sound levels. The existing sound levels were measured using a Type 1 sound analyzer (Larson Davis 824). Measurements were conducted during the weekday daytime (2:00 PM to 4:00 PM) and late night (11:00 PM to 1:00 AM) periods at sensitive receptor areas in February 2012. The measured sound level data under existing conditions was dominated by noise from local roadways (such as Boylston Street and Riverway/Park Drive) and mechanical equipments from nearby buildings. The existing measured L90 sound levels range from 54 dB(A) to 58 dB(A) during the daytime period and was 51 dB(A) during the nighttime period. These sound levels are typical of an urban area. The result of the noise monitoring program indicates that the sound levels within the study area are below the City’s daytime noise 4-32 Environmental Protection
\\MABOS\projects\11381.00\reports\Article80\ Expanded_PNF\04_Environmental_FINAL.do c Vanasse Hangen Brustlin, Inc. The Point, Boston standard of 60 dB(A) and are approximately equal to the City’s nighttime standard of 50 dB(A) for Residential Districts. The existing measured sound level data are presented in Table 4-10. Project-Related Noise Table 4-10 Measured Existing Sound Levels, dB(A) 4-33 Environmental Protection Boston Noise Criteria Measured Sound Levels Monitoring Location* Daytime Nighttime Daytime Nighttime Peterborough Street 60 50 54 51 Riverway 60 50 58 51 Source: Vanasse Hangen Brustlin, Inc. * See Figure 4.5 for monitoring locations. Bold values exceed noise criteria. The noise analysis evaluated the potential noise impacts from rooftop mechanical equipment and loading activities. Since the Project is in the early stages of the design process, the analysis determined the overall total maximum sound level that the Project’s rooftop mechanical equipment may generate in order to meet the City of Boston’s noise standards at the sensitive receptor locations. Rooftop Mechanical Equipment The noise analysis assumed that the Project would have a combination of air handling units, HVAC units, cooling towers, and emergency generators based upon its energy requirements. The maximum sound levels that the rooftop mechanical equipments may generate without violating the City of Boston’s noise standards at any of the sensitive receptor locations were calculated. The sound levels from the mechanical equipment were projected to the sensitive receptor locations. The noise analysis included the impacts of path of sound propagation due to building blockages from the existing and proposed buildings. Since the design of the proposed building is significantly higher than surrounding buildings in the vicinity of the Project, reductions due to blockage from the proposed building’s rooftop and parapet was also considered. Additionally, state of the art equipment will be selected and located within a mechanical room on the roof that would be designed to achieve sound levels below the City’s noise standards at the sensitive receptor locations. The Project may require emergency generators that maybe located on the rooftop of the building. The determination of specific generator parameters, such as the number of units, size, and location will be made during the building design. The Project will apply for the appropriate DEP air permits, which include additional noise requirements described in DEP regulations under 310 CMR 7.00. When the details of the emergency generators are developed, the Proponent will submit the appropriate permit application to DEP including the noise mitigation measures, such as acoustic enclosures and exhaust silencers necessary to meet the DEP’s noise criteria.
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