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HomeMy WebLinkAboutsubmission Kinsella=lin ME MINI III IMP !ORM= IMMI MI =.,g= In MI= WWI Uzi ' Lc Pelton Marsh Kinsella REPORT TO ROYAL ATLANTIC DEVELOPERS, LLC MIAMI RIVER / ROYAL ATLANTIC PREPARED FOR MR. EDWIN VERDEZOTO PRESIDENT BY: GARY KINSELLA PRINCI' L CONSULTANT PROJECT # 022787.010 January 19, 2004 SUBMITTED INTO THE PUBLIC RECORD FOR ITEM P2/61 ON F /WI- MMBI--/MI - - - ---- --.-- Pelton Marsh Kinsella EXECUTIVE SUMMARY At the request of Royal Atlantic Developers, LLC, we have reviewed and evaluated the sound environment at the proposed Miami River / Royal Atlantic Development Site and the Spring Gardens Community. Sound Level Measurements were performed at the proposed site and a SoundPLAN Model was developed to graphically analyze the site. It is our opinion that sounds reflected from the proposed structures will minimally impact the Community of Spring Gardens. OBSERVATIONS We performed a sound survey at the proposed development site to verify the previous measurements in the area from our files. All Sound Level Data in this report are dBA. Please refer to the attached Definitions of Acoustical Terms. It is our observation that the ambient background noise in the area is caused by the nearby Hwy 836 highway and local street vehicular traffic. Other sounds that impact the community are aircraft overflights from Miami International Airport, construction sounds from the nearby Norseman and Merrill Stevens Shipyards and sounds associated with the NW 12th Avenue Highway Bridge. A common single event noise heard in the community is the sound of vehicle tires crossing the steel grid road surface of the NW 12th Ave bridge. The bridge also opens on demand from river marine traffic. The opening is accompanied by bells and horns to warn pedestrians and vehicles of the opening. Another common sound heard in the community is aircraft noise from takeoff and landing activity at the Miami International Airport. The worse case is takeoff overflights from runway 09L south departures which directly overfly the community. The typical flight path is directly over, or slightly north or south of the Miami River. The noise emanated by the existing building on the proposed site also impacts the community. This includes equipment noise from the equipment behind the ventilation louvers on the building facing the residences across the river, as well as the cooling tower and rooftop equipment clearly visible from the community. DISCUSSION We constructed SoundPLAN computer models of the existing community noise as well as our projections of the noise after construction of the proposed structures. These models are attached. They are models of aircraft noise and marine traffic noise before and after construction of the proposed structures. Each of the models include the ambient background noise consisting primarily of noise from nearby highways and thoroughfares, which is common to all Miami urban areas. The aircraft noise models result from overflight sound data of commercial jet south departures from Miami International Airport Runway 09L. This is the worse case as these departures directly overfly the community of Spring Gardens climbing to 5,000 ft altitude. Other MIA departures and arrivals typically do not overfly the community. Marine traffic typically consists of small vessels navigating the river. We modeled the worse case of tug boats escorting a commercial ocean vessel including the vessel's engines and generators operating. CONCLUSION It is our opinion that the direct noise from the transportation noise sources cited above will be the primary contributors to the sound environment of the community after construction of the proposed development. Our calculations indicate minimal sound reflections from the proposed structures. In fact, the existing building vent fan and cooling tower noise contributions will be eliminated with the destruction of the existing building. Our noise control design of the new proposed structures will mitigate projection of equipment noise into the community. V Pe Pelton Marsh Kinsella ACOUSTICAL TERMS The following acoustical terms are used in this report. They are defined here for your information. dB (decibel): The basic unit of sound level. The decibel denotes a ratio of the intensity of one sound and the lower intensity ofa reference sound. On the decibel scale, small differences become highly critical. Only 5 dB separate the level of a normal conversation from the din created by nine typewriters. Octave: The interval between two sounds that have a frequency ratio of 2:1. There is one octave between 200 and 400 Hz, as well as between 1000 and 2000 Hz. Speech privacy measurements are made over intervals of 1/3-octave, for more detailed data and more precise conclusions. Hz (Hertz): The unit of frequency. One Hertz equals one cycle per second. The frequency of the human voice can range from 100 to 10,000 Hz, though the frequencies of intelligible speech lie between 400 and 2000 Hz. dBA: Decibels, measured on the "A" scale, of a sound level meter. The "A" scale is preferred for speech privacy and environmental sound measurements because it corresponds closely to the sensitivity of the ear. Like the ear, it virtually ignores low frequency sound, but responds accurately to the frequencies of normal speech. Articulation Index (A.I.): A numerical value (0 to 1.0) of speech intelligibility --derived from an analysis of background sound, expected speech effort, and the acoustical qualities of the area and its components. An A.I. of 0.1 is low, indicating that little, if any, ofa conversation will be intelligible to listeners. An area with an A.I. of 0.6, on the other hand, will make for poor speech privacy. Nc (Noise Criteria curve or level): A curve which describes sound levels that are acceptable over a range of frequencies for a specific building function. The ear is less sensitive to low frequency sound, so the permissible sound levels at low frequencies can be relatively high without causing problems. On the curve NC-40, for example, a 66 dB level is permissible at 63 Hz. At 2000 Hz, however, the acceptable level is only 40 dB because the ear is more sensitive to higher frequencies. The NC-40 curve, not incidentally, describes an acceptable background sound level from all of the sound sources in a normal office. ACOUSTICAL TERMS (Continued) Electronic background masking sound: An electronically produced sound used to obscure intrusive speech sounds. This sound is tailored to fit the specific masking requirements of the room. Speech Interference Level (SIL): A way of rating the speech masking affects of noise based on measurements of the noise in each of the octave bands centered at 500, 1000 and 2000 Hz. Insertion Loss (I.L.): The difference, in decibels, between two sound pressure levels which are measured at the same point in space before and after a muffler or barrier is inserted between the measurement point and the noise source. Transmission Loss (T.L.): Ameasureofthesound insulating propertiesofawall, floor, ceiling, windowordoor, thatischaracteristic of the partition itself and not of the room which it bounds. It can not be measured directly. Noise Reduction Coefficient (NRC): An average of the sound absorptive properties ofa material at 250, 500, 1000 and 2000 Hz frequencies. Sound Transmission Class (STC): A general method of categorization of partitions by transmission Toss performance is a good single numberdescriptorfornoisesuchasspeech, radioand TV but notformechanical equipment, HVAC, etc. Noise Reduction (N.R.) Ameasureofthesound insulating properties of awall, floor, ceiling, windowordoor. Itcan be measured directly. Equivalent Sound Level (LFQZ The equivalent steady sound level that, if continuous during the time period of interest (t1 to t2), would contain the same total sound energy as the actual time -varying sound. Day Night Average Sound Level (Lo,,,J Day -Night level, in decibels, forthe period from midnightto midnight, obtained afteraddition of 10decibelstosound levels in the night from midnight to 7 a.m. and from 10 p.m. to midnight. Impact Insulation Class (IIC) A single -number rating which is a measure of the impact sound isolation provided by a floor/ceiling construction. In general, the higher the impact insulation class (IIC) rating, the greater the impact noise insulation provided by the construction. Existing Airplane Noise SPRING GARDENS 1 11 Noise level Day in dB(A) <_83.5 83 ° < <= 84.0 84.C< <= 84.5 84.C< <= 85.0 85.0 < Signs and symbols Area Line source Llevalion point 1 f Noise calculation area 4 ST Airplane Noise with Buildings +1 dBA SPRING GARDENS II • �— hi.rr• Noise level Day in dB(A) 83.5< 84.0< 84.5< 85.0< <= 83.5 <= 84.0 <= 84.5 <= 85.0 Signs and symbols Area Line source Elevation point uNoise calculation area 1 Main bui rq )Ink <= 55.0 55.0< <= 57.0 57.0< <= 59.0 59.0< <= 61.0 81.0 < <= 63.0 63.0< <= 65.0 6<=<= 6769..0 67.C5.0<< Via,=,:^« 0 69.0 < <= 71.0 71.0< <= 73.0 73.0< <= 75.0 75.0< <= 77.0 77.0< <= 79.0 79.0< <= 81.0 81.0< <=83.0 83.C< Signs and symbols Une Area Une source ELerajon pool 7-7 Nc,se calculation area River Traffic Noise With Buildings +1 dBA <=55.0 55.0< <=57.0 57.C< <= 59.0 59.0 < <= 61.0 61.0 < <= 63.0 63.0 < <= 65.0 65.0 < <= 67.0 67.0<y{Xa <=69.0 69.0 < <= 71.0 71.0< <=73.0 73.0< <= 75,0 75.0< <= 77.0 77.0< <= 79.0 79.0 < <= 81.0 81.0 < <= 83.0 83.0 < Area Line source Elevation point S O LJ IN CO SoundPLAN and SoundPLAN 386 HIGH PERFORMANCE are proven, flexible and comprehensive software packages which support all noise and other environmental studies. 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