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HomeMy WebLinkAbout613151000 Noise Study AZ Office CA Office 4960 S. Gilbert Rd, Suite 1-461 1197 Los Angeles Ave, Suite C-256 Chandler, AZ 85249 Simi Valley, CA 93065 p. (602) 774-1950 p. (805) 426-4477 www.mdacoustics.com | www.ebiconsulting.com MD Acoustics, LLC | EBI Consulting, Inc. 1 JN: 04601923_Letter Report EBI JN: 6219001518 May 10, 2019 AT&T C/O General Dynamics 6664 South Dateland Dr, Ste B Tempe, AZ 85283 C/O EBI Consulting Subject: AT&T – 10049045 Fullerton Road Generator Add – Noise Review Letter – Forks, WA MD Acoustics, LLC (MD) has completed a noise assessment for the 10049045 Fullerton Road Generator Add project located at 7048 Oil City Road, Forks, WA. The site plan utilized for the project is located in Exhibit A (page 3 of this report). The project was assessed with regard to the future emergency generator (Kohler 20kw Diesel Generator) noise level projections to the nearest sensitive receptors and compared to the County’s applicable noise limits as outlined in the County’s Noise Ordinance. The project proposes to install Kohler 20kw Diesel Generator with subbase fuel tank on new concrete pad. A glossary of acoustical terms is located in Appendix A. 1.0 Acoustics Requirements The County has outlined the noise limit for residential districts within the county of Jefferson County. Chapter 173 Maximum Environmental Noise Levels Section 60-040 from the Washington Administrative Code (WAC) provides the exterior noise limits associated with different land uses and is provided in Appendix B. Table 1 below gives the maximum permitted noise levels, unless otherwise specifically indicated, which shall apply to all receiving properties within a designated noise zone for establishing noise level limits. Table 1: Maximum Permitted Noise Levels Per WAC 173-60-040 (b) between the hours of 10:00 PM and 7:00 AM the noise limitations of the foregoing table shall be reduced 10 dBA for receiving property within Class A EDNAs. Therefore, this study evaluates the telecommunications worst-case noise levels and compares the results to the County’s nighttime (10PM – 7AM) residential noise standard of 45 dBA. 10049045 Fullerton Road Generator Add Noise Impact Study Forks, WA MD Acoustics, LLC | EBI Consulting, Inc. 2 JN: 04601923_Letter Report EBI JN: 6219001518 2.0 Study Method and Procedure The future telecommunication equipment noise level was modeled using SoundPlan 3D (SP) acoustic modeling software. SP is capable of evaluating stationary noise sources (e.g. point sources such as fans, exhaust from generators) at various receptor locations. SP’s software utilizes algorithms (based on inverse square law and reference equipment noise level data) to calculate the noise projections. The software allows the user to input specific noise sources, spectral content, sound barriers, building placement, topography and noise sensitive receptors. Appendix C provides the model’s inputs and outputs. 3.0 Findings A total of one (1) receptors were modeled to accurately evaluate the future operational noise levels at and/or adjacent to the project site. A receptor is denoted by a yellow dot. The dot represents either a property line, a sensitive receptor such as an outdoor sensitive area/building facade or a calibration point (point where sound pressure levels are confirmed to match manufacturer’s noise data). The nearest property line from the project site is approximately 2 miles away, therefore Receptor 1 represents the worst case nearest sensitive receptor 500 feet from the project’s property line. It should also be noted that the baseline noise level will only change under a power loss (emergency) situation or during routine maintenance. Exhibit B provides the future noise level projections based on the proposed project design (page 4 of this report). The noise levels at the worst case nearest sensitive receptor 500 feet from the project’s property line will be 33.0 dBA which is below the County’s 45 dBA nighttime residential standard. Exhibit C illustrates the noise contours at the project site and illustrates how the noise will propagate (page 5 of this report). No additional noise mitigation is required as the project will comply with the County’s nighttime residential noise limit of 45 dBA. 4.0 Conclusion MD is pleased to provide this noise review for this project. The project will comply with the County’s applicable noise allowable limits based on the proposed design. If you have any questions regarding this letter, please call our office at (602) 774-1950. Sincerely, MD Acoustics, LLC Mike Dickerson, INCE Robert Pearson Principal Acoustical Consultant 10049045 Fullerton Road Generator Add Noise Impact Study Forks, WA MD Acoustics, LLC | EBI Consulting, Inc. 3 JN: 04601923_Letter Report EBI JN: 6219001518 Exhibit A Site Plan 10049045 Fullerton Road Generator Add Noise Impact Study Forks, WA MD Acoustics, LLC | EBI Consulting, Inc. 4 JN: 04601923_Letter Report EBI JN: 6219001518 Exhibit B Future Operational Noise Level 10049045 Fullerton Road Generator Add Noise Impact Study Forks, WA MD Acoustics, LLC | EBI Consulting, Inc. 5 JN: 04601923_Letter Report EBI JN: 6219001518 Exhibit C Future Operational Noise Level MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report Appendix A Glossary of Acoustical Terms MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report Glossary of Terms A-Weighted Sound Level: The sound pressure level in decibels as measured on a sound level meter using the A-weighted filter network. The A-weighting filter de-emphasizes the very low and very high frequency components of the sound in a manner similar to the response of the human ear. A numerical method of rating human judgment of loudness. Ambient or Background Noise Level: The composite of noise from all sources, near and far. In this context, the ambient noise level constitutes the normal or existing level of environmental noise at a given location. Decibel (dB): A unit for measuring the amplitude of a sound, equal to 20 times the logarithm to the base 10 of the ratio of the pressure of the sound measured to the reference pressure, which is 20 micro-pascals. dB(A): A-weighted sound level (see definition above). Equivalent Sound Level (LEQ): The sound level corresponding to a steady noise level over a given sample period with the same amount of acoustic energy as the actual time varying noise level. The energy average noise level during the sample period. Field Sound Transmission Class (FSTC): The field sound transmission class (FSTC) rating is used for in situ wall and floor/ceiling sound isolation performance assessment. The standard requires the measurement of sound transmission loss and includes required procedure to show that the FSTC rating, as it has been determined by the test procedure, was not influenced by flanking of sound around the partition intended to be tested. Sound transmission class and FSTC ratings are intended by standard to be equivalent; however, practical experience indicates that FSTC ratings tend to be up to five ratings points less than laboratory-measured STC ratings. Day-Night Level (LDN or DNL): LDN is the average noise level over a 24-hour period. The noise between the hours of 10PM to 7AM is artificially increased by 10 dB. This noise is weighted to take into account the decrease in community background noise of 10 dB during this period. Noise: Any unwanted sound or sound which is undesirable because it interferes with speech and hearing, or is intense enough to damage hearing, or is otherwise annoying. The State Noise Control Act defines noise as "...excessive undesirable sound...". Noise Isolation Class (NIC): The noise isolation class (NIC) rating is similar to STC and FSTC. However, the standard STC rating contour is applied to the one-third octave band noise reduction measured in a field situation, rather than the transmission losses measured in the field. No correction to the measured noise reduction data is made to account for partition size, receiving room absorption, or sound flanking. Like the STC and FSTC ratings, the field measured NIC rating of a noise reduction spectrum is equal to the value of the contour crossing at 500 Hz. In the absences of sound flanking, the NIC is generally within five points of the laboratory STC rating for typical building partition constructions. The NIC rating is used to assess the sound isolation performance of in situ partition construction, especially complicated ones that involve MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report multiple sound transmission paths that are not suited for laboratory testing. The NIC rating is often used in lieu of STC and FSTC. Normalized Noise Isolation Class (NNIC): The normalized noise isolation class (NNIC) is the same as the NIC rating except the receiving room absorption is normalized to correspond to a 0.5-s reverberation time. Sound Level (Noise Level): The weighted sound pressure level obtained by use of a sound level meter having a standard frequency-filter for attenuating part of the sound spectrum. Sound Level Meter: An instrument, including a microphone, an amplifier, an output meter, and frequency weighting networks for the measurement and determination of noise and sound levels. Sound Transmission Class (STC): To quantify STC, a Transmission Loss (TL) measurement is performed in a laboratory over a range of 16 third-octave bands between 125 – 4,000 Hertz (Hz). The average human voice creates sound within the 125 – 4,000 Hz 1/3rd octave bands. STC is a single-number rating given to a particular material or assembly. The STC rating measures the ability of a material or an assembly to resist airborne sound transfer over the specified frequencies (see ASTM International Classification E413 and E90). In general, a higher STC rating corresponds with a greater reduction of noise transmitting through a partition. STC is highly dependent on the construction of the partition. The STC of a partition can be increased by: adding mass, increasing or adding air space, adding absorptive materials within the assembly. The STC rating does not assess low frequency sound transfer (e.g. sounds less than 125 Hz). Special consideration must be given to spaces where the noise transfer concern has lower frequencies than speech, such as mechanical equipment and or/or music. The STC rating is a lab test that does not take into consideration weak points, penetrations, or flanking paths. Even with a high STC rating, any penetration, air-gap, or “flanking path can seriously degrade the isolation quality of a wall. Flanking paths are the means for sound to transfer from one space to another other than through the wall. Sound can flank over, under, or around a wall. Sound can also travel through common ductwork, plumbing or corridors. Noise will travel between spaces at the weakest points. Typically, there is no reason to spend money or effort to improve the walls until all weak points are controlled first. MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report Appendix B Washington Administrative Code (WAC) Noise Ordinance 5/9/2019 WAC 173-60-040: https://app.leg.wa.gov/wac/default.aspx?cite=173-60-040 1/1 WAC 173-60-040WAC 173-60-040 Maximum permissible environmental noise levels.Maximum permissible environmental noise levels. (1) No person shall cause or permit noise to intrude into the property of another person which(1) No person shall cause or permit noise to intrude into the property of another person which noise exceeds the maximum permissible noise levels set forth below in this section.noise exceeds the maximum permissible noise levels set forth below in this section. (2)(a) The noise limitations established are as set forth in the following table after any applicable(2)(a) The noise limitations established are as set forth in the following table after any applicable adjustments provided for herein are applied.adjustments provided for herein are applied. Class AClass A Class BClass B Class CClass C 55 dBA55 dBA 57 dBA57 dBA 60 dBA60 dBA 5757 6060 6565 6060 6565 7070 (b) Between the hours of 10:00 p.m. and 7:00 a.m. the noise limitations of the foregoing table(b) Between the hours of 10:00 p.m. and 7:00 a.m. the noise limitations of the foregoing table shall be reduced by 10 dBA for receiving property within Class A EDNAs.shall be reduced by 10 dBA for receiving property within Class A EDNAs. (c) At any hour of the day or night the applicable noise limitations in (a) and (b) above may be(c) At any hour of the day or night the applicable noise limitations in (a) and (b) above may be exceeded for any receiving property by no more than:exceeded for any receiving property by no more than: (i) 5 dBA for a total of 15 minutes in any one-hour period; or(i) 5 dBA for a total of 15 minutes in any one-hour period; or (ii) 10 dBA for a total of 5 minutes in any one-hour period; or(ii) 10 dBA for a total of 5 minutes in any one-hour period; or (iii) 15 dBA for a total of 1.5 minutes in any one-hour period.(iii) 15 dBA for a total of 1.5 minutes in any one-hour period. [Order 74-32, § 173-60-040, filed 4/22/75, effective 9/1/75.][Order 74-32, § 173-60-040, filed 4/22/75, effective 9/1/75.] MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report Appendix C SoundPlan Input/Output Frequency spectrum [dB(A)]Corrections Source name Reference Level 63 125 250 500 1 2 4 8 16 Cwall CI CT dB(A)Hz Hz Hz Hz kHz kHz kHz kHz kHz dB(A)dB(A)dB(A) 1 Lw/unit Day 95.0 68.8 78.6 90.4 90.4 87.8 84.0 76.3 67.7 54.4 --- Night ------------- Noise emissions of industry sources MD Acoustics 1197 E Los Angeles Ave,Unit C 256 Simi Valley, CA 93065 USA Level w/o NP Level w NP Source name Day Night Day Night dB(A)dB(A) 2 GF 33.0 33.0 0.0 0.0 1 33.0 33.0 0.0 0.0 Contribution levels of the receivers MD Acoustics 1197 E Los Angeles Ave,Unit C 256 Simi Valley, CA 93065 USA MD Acoustics, LLC | EBI Consulting, Inc. JN: 04601923_Letter Report Appendix D Manufacturers Cut Sheet KD20U Engine type 3029DFS29 Alternator type KH00404T Performance class G3 GENERAL CHARACTERISTICS Frequency (Hz) Voltage (V) Standard control panel Optional control panel Optional control panel POWER ESP PRPVoltagekWekVAkWekVA Standby Amps 480/277 20 25 18.2 22.7 30 440/254 20 25 18.2 22.7 33 220/127 20 25 18.2 22.7 66 208/120 18.4 23 16.7 20.9 64 DIMENSIONS COMPACT VERSION Length (mm)1700 Width (mm)896 Height (mm)1221 Dry weight (kg)709 Tank capacity (L)100 DIMENSIONS SOUNDPROOFED VERSION Commercial reference of the enclosure M127 Length (mm)2080 Width (mm)960 Height (mm)1415 Dry weight (kg)930 Tank capacity (L)100 Acoustic pressure level @1m in dB(A) 78 Sound power level guaranteed (Lwa) - DESCRIPTIVE Kohler Co. Provides one-source responsibility for the generating system and accessories The generator set and its components are prototype- tested, factory-built, and production-tested A one-year limited warranty covers all systems and components POWER DEFINITION PRP : Prime Power is available for an unlimited number of annual operating hours in variable load applications, in accordance with ISO 8528-1. ESP : The standby power rating is applicable for supplying emergency power in variable load applications in accordance with ISO 8528-1. Overload is not allowed TERMS OF USE According to the standard, the nominal power assigned by the genset is given for 25°C Air Intlet Temperature, of a barometric pressure of 100 kPA (100 m A.S.L), and 30 % relative humidity. For particular conditions in your installation, refer to the derating table. ASSOCIATED UNCERTAINTY For the generator sets used indoor, where the acoustic pressure levels depend on the installation conditions, it is not possible to specify the ambient noise level in the operating and maintenance instructions. You will also find in our operating and maintenance instructions a warning concerning the air noise dangers and the need to implement appropriate preventive measures. This document is not contractual - Kohler Co. reserves the right to modify any of the characteristics without notice, in a constant effort to improve the quality of its products. GBD5-03012 (KD20U) 06/17 Acoustic pressure level @7m in dB(A) 68 60 480/277 APM303 DEC4000 M80 Mechanic governor Mechanically welded chassis with antivibration suspension Main line circuit breaker Radiator for core temperature of 48/50°C max with mechanical fan Protective grille for fan and rotating parts (CE option) 9 dB(A) silencer supplied separately Charger DC starting battery with electrolyte 12 V charge alternator and starter Delivered with oil and coolant -30°C Manual for use and installation KD20U ENGINE CHARACTERISTICS JOHN DEERE 3029DFS29 Athmo L 3 2.91 - 106 x 110 17.2 : 1 1800 6.6 35 +/- 2.5% 8.7 GENERAL ENGINE DATA Engine model Engine type Air inlet Cylinders arrangement Number of cylinders Displacement (L) Charge Air coolant Bore (mm) x Stroke (mm) Compression ratio Speed (RPM) Pistons speed (m/s) Maximum stand-by power at rated RPM (kW) Frequency regulation (%) BMEP (bar) Governor type Mechanical COOLING SYSTEM Radiator & Engine capacity (L)16.1 Max water temperature (°C)- Outlet water temperature (°C)- Fan power (kW)1.2 2.22 20 Fan air flow w/o restriction (m3/s) Available restriction on air flow (mm H2O) Type of coolant Glycol-Ethylene Thermostat modulating range HT (°C) - - - - EMISSIONS Emission PM (g/kWh) Emission CO (g/kWh) Emission HC+NOx (g/kWh) Emission HC (mg/Nm3) 5% O2 30 570 102 EXHAUST Exhaust gas temperature @ ESP 60Hz (°C) Exhaust gas flow @ ESP 60Hz (L/s) Max. exhaust back pressure (mm H2O)625 9 8 6.5 4.4 FUEL Fuel consumption 110% load (L/h) Fuel consumption 100% load (L/h) Fuel consumption 75% (L/h) Fuel consumption 50% (L/h) Maximum fuel pump flow (L/h)108 6 1 5 0.2 OIL Oil capacity (L) Min. oil pressure (bar) Max. oil pressure (bar) Oil consumption 100% load (L/h) Oil sump capacity (L)5.3 31 7 HEAT BALANCE Heat rejection to exhaust (kW) Radiated heat to ambient (kW) Heat rejection to coolant (kW)20 300 AIR INTAKE Max. intake restriction (mm H2O) Intake air flow (L/s)36 This document is not contractual - Kohler Co. reserves the right to modify any of the characteristics without notice, in a constant effort to improve the quality of its products. GBD5-03012 (KD20U) 06/17 KD20U ALTERNATOR CHARACTERISTICS GENERAL DATA Alternator type KH00404T Number of Phase Three phase Power factor (Cos Phi)0.8 Altitude (m)0 to 1000 Overspeed (rpm)2250 Number of pole 4 Capacity for maintaining short circuit at 3 ln for 10 s Yes Insulation class H T° class, continuous 40°C H / 125°K T° class, standby 27°C H / 163°K AVR Regulation Yes Total Harmonic Distortion in no-load DHT (%)3.6 Total Harmonic Distortion, on load DHT (%)2 Wave form : NEMA=TIF <45 Wave form : CEI=FHT <2 Number of bearing 1 Coupling Direct 1 200 Voltage regulation at established rating (+/- %) Recovery time (Delta U = 20% transient) (ms) Protection class IP 23 Technology Without collar or brush OTHER DATA Continuous Nominal Rating 40°C (kVA)24 Standby Rating 27°C (kVA)25.8 Efficiencies 100% of load (%)89.5 Air flow (m3/s)0.097 Short circuit ratio (Kcc)0.62 Direct axis synchro reactance unsaturated (Xd) (%)184.5 Quadrature-axis synchro reactance unsaturated (Xq) (%) Open circuit time constant (T'do) (ms)850 Direct axis transient reactance saturated (X'd) (%)14.6 44 8.4 14 19.2 10 Zero sequence reactance unsaturated (Xo) (%)3.38 Negative sequence reactance saturated (X2) (%)12.5 Armature time constant (Ta) (ms)12 No load excitation current (io) (A)0.5 Full load excitation current (ic) (A)1.5 15.9 76 Full load excitation voltage (uc) (V) Engine start (Delta U = 20% perm. or 50% trans.) (kVA) Transient dip (4/4 load) - PF : 0,8 AR (%)14.1 No load losses (W)569 Heat rejection (W)2253 DIMENSIONS Dimensions soundproofed version Commercial reference of the enclosure M127 Length (mm)2080 Width (mm)960 Height (mm)1415 Dry weight (kg)930 Tank capacity (L)100 Acoustic pressure level @1m in dB(A) 78 Sound power level guaranteed (Lwa) - This document is not contractual - Kohler Co. reserves the right to modify any of the characteristics without notice, in a constant effort to improve the quality of its products. GBD5-03012 (KD20U) 06/17 Acoustic pressure level @7m in dB(A) 68 80 Short circuit transient time constant (T'd) (ms) Direct axis subtransient reactance saturated (X''d) (%) Subtransient time constant (T"d) (ms) Quadrature-axis subtranscient reactance saturated (X"q) (%) Subtransient time constant (T"q) (ms) Unbalanced load acceptance ratio (%)100 Dimensions DW compact version - 2160 966 1388 891 230- - Commercial reference of the enclosure Length (mm) Width (mm) Height (mm) Dry weight (kg) Tank capacity (L) Acoustic pressure level @1m in dB(A) Sound power level guaranteed (Lwa) Acoustic pressure level @7m in dB(A) - Dimensions DW soundproofed version M127 DW 2160 966 1582 1120 230 78 - Commercial reference of the enclosure Length (mm) Width (mm) Height (mm) Dry weight (kg) Tank capacity (L) Acoustic pressure level @1m in dB(A) Sound power level guaranteed (Lwa) Acoustic pressure level @7m in dB(A) 68 Dimensions DW 48h soundproofed version M127 DW48 2160 966 1631 1124420 78- Commercial reference of the enclosure Length (mm) Width (mm) Height (mm) Dry weight (kg) Tank capacity (L) Acoustic pressure level @1m in dB(A) Sound power level guaranteed (Lwa) Acoustic pressure level @7m in dB(A) 68 KD20U CONTROL PANEL APM303, comprehensive and simple The APM303 is a versatile unit which can be operated in manual or automatic mode. Equipped with an LCD screen, the user-friendly APM303 offers high-quality basic functions to guarantee simple, reliable operation and supervision of your generating set. It offers the following features: Measurements: phase-to-neutral and phase-to-phase voltages, active power currents, effective power, power factors, Kw/h energy meter Fuel, oil pressure and coolant temperature levels Supervision: Modbus RTU communication on RS485 Reports: 2 configurable reports Safety features: Overspeed, oil pressure Coolant temperatures Minimum and maximum voltage Minimum and maximum frequency Maximum current Maximum active power Phase sequence Traceability: Stack of 12 stored events For further information, please refer to the data sheet for the APM303. DEC4000, ergonomic and user-friendly This document is not contractual - Kohler Co. reserves the right to modify any of the characteristics without notice, in a constant effort to improve the quality of its products. GBD5-03012 (KD20U) 06/17 The highly versatile DEC4000 control unit is complex yet accessible, thanks to the particular attention paid to optimising its ergonomics and ease of use. With its large display screen, buttons and scroll wheel, it places the accent on simplicity and communication. The DEC4000 offers the following functions: Electrical measurements: voltmeter, frequency meter, ammeter. Engine parameters: working hours counter, oil pressure, coolant temperature, fuel level, engine speed, battery voltage. Alarms and faults: oil pressure, coolant temperature, failure to start, overspeed, alternator min./max., battery voltage min./max., emergency stop, fuel level. Ergonomics: wheel for navigating around the various menus. Communication: remote control and operation software, USB connections, PC connection. For more information on the product and its options, please refer to the sales documentation. The control unit can be used as a basic terminal block for connecting a control box. Offers the following functions: emergency stop button, customer connection terminal block, CE. Basic terminal block KD20U CONTROL PANEL This document is not contractual - Kohler Co. reserves the right to modify any of the characteristics without notice, in a constant effort to improve the quality of its products. GBD5-03012 (KD20U) 0/17 M80, transfer of information The M80 is a dual-function control unit. It can be used as a basic terminal block for connecting a control box and as an instrument panel with a direct read facility, with displays giving a global view of your generating set's basic parameters. Offers the following functions: Engine parameters: tachometer, working hours counter, coolant temperature indicator, oil pressure indicator, emergency stop button, customer connection terminal block, CE.