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HomeMy WebLinkAboutRS_KCESI2_Noise_Study_190118_v3.pdf p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 DATE: January 18, 2019 TO: Erik Waligorski, PE – Carollo Engineers, Inc. FROM: Drew J. Savas – The Greenbusch Group, Inc. RE: Eastside Interceptor Section 2 Rehabilitation Phase II – Noise Study Transmitted by: Mail Delivery Fax E-mail Erik: The intent of this memorandum is to present predicted sound levels during daytime and nighttime construction activities, compare predicted sound levels with regulatory criteria, recommend sound level limits and present potential mitigation for the Eastside Interceptor Section 2 Rehabilitation Phase II Project (“Project”) in Renton, Washington. Daytime construction activities will consist of bypass pumping, odor control, general construction, excavation, restoration, and pipe lining. Daytime activities will occur along the project alignment shown in Figure 1. Nighttime activities will consist of bypass pumping and odor control, bypass sewer installation and removal at three locations and pipe lining at four manholes. Nighttime work will require a noise variance from the City of Renton. SUMMARY Daytime operations are expected to comply with the City of Renton and King County Guide Specification criteria. Nighttime operations are expected to exceed maximum permissible noise limits. Therefore, it is recommended that a noise variance be obtained from the City of Renton. A summary of requested sound level limits for anticipated nighttime construction to occur can be found in Table 13. Daytime operations should not exceed an hourly LEQ of 85 dBA 50 feet from the construction boundary or at residential-use receptors when measured at the building envelop, whichever is further. January 18, 2019 Page 2 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 NOMENCLATURE Decibel, dBA The auditory response to sound is a complex process that occurs over a wide range of frequencies and intensities. Decibel levels, or “dB,” are a form of shorthand that compresses this broad range of intensities with a convenient numerical scale. The decibel scale is logarithmic. For example, using the decibel scale, a doubling or halving of energy causes the sound level to change by 3 dB; it does not double or halve the sound loudness as might be expected. The minimum sound level variation perceptible to a human observer is generally around 3 dB. A 5-dB change is clearly perceptible, and an 8 to 10 dB change is associated with a perceived doubling or halving of loudness. The human ear has a unique response to sound pressure. It is less sensitive to those sounds falling outside the speech frequency range. Sound level meters and monitors utilize a filtering system to approximate human perception of sound. Measurements made utilizing this filtering system are referred to as “A weighted” and are called “dBA”. Table 1. A-weighted Levels of Common Sounds Sound Sound Level (dBA) Approximate Relative LoudnessA Jet Plane @ 100 feet 130 128 Rock Music with Amplifier 120 64 Thunder, Danger of Permanent Hearing Loss 110 32 Boiler Shop, Power Mower 100 16 Orchestral Crescendo at 25 feet 90 8 Busy Street 80 4 Interior of Department Store 70 2 Ordinary Conversation at 3 feet 60 1 Quiet Car at Low Speed 50 1/2 Average Office 40 1/4 City Residence, Interior 30 1/8 Quiet Country Residence, Interior 20 1/16 Rustle of Leaves 10 1/32 Threshold of Hearing 0 1/64 A As compared to ordinary conversation at 3 feet. Source: US Department of Housing and Urban Development, Aircraft Noise Impact Planning Guidelines for Local Agencies, November 1972. January 18, 2019 Page 3 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Equivalent Sound Level, LAeq LAeq is the A-weighted level of a constant sound having the same energy content as the actual time-varying level during a specified interval. The LAeq is used to characterize complex, fluctuating sound levels with a single number. Typical intervals for LAeq are hourly, daily and annually. Sound Power Level, PWL Sound power is the amount of energy per second generated by a source, measured in watts. The sound power level (PWL) is a decibel representation with a reference value of 1 pico-watt (pW). Sound power is independent of distance, path, or influence from any nearby surfaces. Sound Pressure Level, SPL Sound pressure level correlates with what is heard by the human ear. SPL is defined as the squared ratio of the sound pressure with reference to 20 μPa. Sound pressure is affected by distance, path, barriers, directivity, etc. Percentage Sound Level, L(n) L(n) is the sound level that is exceeded n percent of the time; for example, L08 is the level exceeded 8% of the time. L25 is the sound level exceeded 25% of the time. Maximum Sound Level, Lmax Lmax is the maximum recorded root mean square (rms) A-weighted sound level for a given time interval or event. L max “fast” is defined as a 125-millisecond time-weighted maximum, while Lmax “slow” corresponds to a 1-second time-weighted maximum. REGULATORY CRITERIA Properties surrounding the project area consist of residential, commercial and industrial use. As of September 19th, 2018, the City of Renton no longer groups multiple zoning designations into noise districts called Environmental Designations for Noise Abatement (“EDNA”). Instead, the City has amended Section 8-7-4 of the Renton Municipal Code (“RMC”) to adopt Section 173-60-30 of the Washington Administrative Code (“WAC”). Section 173-60-030 of WAC states that EDNA classification will be defined by the property’s use. Generally, Class A EDNA includes residential use properties, Class B EDNA includes commercial use properties and Class C EDNA includes industrial use properties. Figure 1 provides a graphical representation of EDNAs in the Project area, along with the Project alignment. January 18, 2019 Page 4 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 1. Project Location and Nearby EDNAs Source: King County iMap, The Greenbusch Group, Inc., Bing Maps, City of Renton, Carollo Engineers, Inc. January 18, 2019 Page 5 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Environmental Sound Level Limits City of Renton Maximum permissible environmental sound levels are defined by Section 8-7-2 of the RMC which adopts Section 173-60-040 of the WAC. These sound level limits are based on the EDNA the sound source originates from (EDNA of Sound Source) and in which EDNA the sound is received (EDNA of Receiving Property). A summary of the applicable sound level limits can be found in Table 2. Table 2. Environmental Sound Level Limits, L25 EDNA of Sound Source EDNA of Receiving Property Class A Class B Class C Class A 55 dBA 57 dBA 60 dBA Class B 57 dBA 60 dBA 65 dBA Class C 60 dBA 65 dBA 70 dBA Source: Section 8-7-2 City of Renton Municipal Code, Section 173-60-040 Washington Administrative Code Modifications Modifications to the environmental sound level limits set forth in Table 2 are also outlined in Section 173-60-040 of the WAC. These modifications are for certain times of day and classification of receiving properties. These modifications to the environmental sound level limits include a 10 dBA reduction during the nighttime hours of 10 p.m. and 7 a.m. when the receiving property is within Class A EDNAs. Exemptions Section 173-60-050 of the WAC referenced by Section 8-7-2 of the RMC allows exemptions from environmental sound level limits set forth in Table 2. Applicable exemptions include all sounds originating from temporary construction sites as a result of construction activity that are received in Class B and Class C EDNAs, and in Class A EDNA between the hours of 7 a.m. and 10 p.m.. Construction activities that generate sounds received in Class A EDNAs between 10 p.m. and 7 a.m. need to comply with sound level limits in Table 2. It is our interpretation of the RMC that all construction equipment, including bypass pumps and blowers, would qualify for this exemption. January 18, 2019 Page 6 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 PROJECT-SPECIFIC CRITERIA King County Guide Specification Section 01 35 43 defines sound level limits and general noise control requirements for the Project, as summarized below. • Sound Level Limits o Noise levels for scrapers, pavers, graders, and trucks shall not exceed 90 dBA and pile drivers shall not exceed 95 dBA at 50 feet as measured under the noisiest operating conditions. o For other equipment, noise levels shall not exceed 85 dBA. Equipment that cannot meet these levels shall be quieted by use of improved exhaust mufflers, noise attenuation barriers or other means. • General Noise Control Requirements o Noise complaints received by the Project Representative during the Work will be shared with the contractor. Work with the Project Representative, as required, to resolve noise related complaints. o Noisy operations shall be scheduled to minimize their impact. o Unless otherwise indicated through a noise variance, comply with local controls and noise level rules, regulations, and ordinances which apply to work performed. o Each internal combustion engine, used on the job or related to the job, shall be equipped with a muffler of a type recommended by the manufacturer. No internal combustion engine shall be operated without said muffler. o Use electric or hydraulic tools whenever practical to reduce noise. o Provide notification of special circumstances or emergency conditions that require work beyond the hours specified as follows: § Notify the Project Representative and local authority in advance of any proposed extended work hours for preauthorization. Include a written request for authorization per Section 01 14 00 to perform work specified and the circumstances that warrant this request. Include any additional measures to mitigate noise generated by this construction activity if deemed necessary by the Project Representative. § If an emergency situation occurs that warrants extended hours, notify the Project Representative immediately upon determining the need for this work. January 18, 2019 Page 7 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 ACOUSTICAL MODEL The primary tool used to predict sound levels at nearby properties during nighttime operations was a 3-D computer noise modeling environment, Cadna/A. Cadna/A utilizes the CADNA (Control of Accuracy and Debugging for Numerical Applications) computation engine developed by the Pierre et Marie Curie University of Paris. The model accounts for the effects of distance, topography, and surface reflections on sound levels. Locations and sound levels of anticipated equipment were determined from project drawings, information provided by vendors via Carollo Engineers, Inc and Federal Highway Administration (FHWA) and various manufacturers. Topography, building locations and locations of property lines were determined from King County GIS records, Bing Maps, and Google Maps. ANALYSIS AND MITIGATION In addition to daytime construction, nighttime activities are expected to consist of bypass pumping, odor control and ventilation, excavation and pipe lining. Some of these activities will occur continuously while others will be short duration and transient. The following analysis shows the predicted sound levels during these activities as well as sequencing and duration of the activities. Nighttime Sewer Bypass Installation and Removal Sewer bypass installation and removal will need to occur during nighttime hours at three locations; one at the norther extent of the project and two at the southern. These locations are shown in Figure 2. January 18, 2019 Page 8 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 2. Sewer Bypass Install & Removal Construction Areas Source: King County iMap., Bing Maps, City of Renton, Carollo Engineers, Inc. January 18, 2019 Page 9 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Nighttime sewer bypass installation and removal will require the use excavators, trucks and light plants. Sound levels for this equipment were based upon levels defined in the FHWA Construction Noise Control Specification 721.560 and manufacturer data. FHWA 721.560 sound levels are maximum sound levels (LMAX) 50 feet from the source and manufacturer data are sound power levels. The construction equipment sound levels and the predicted percentage of an hour each piece would be in use (acoustical usage factor) are shown below. Table 3. Sewer Bypass Equipment Sound Levels Equipment Usage Factor Sound Level Metric Excavator 40% 85 dBAA Lmax (slow) Dump Truck 40% 85 dBAA Lmax (slow) Light Plant 100% 95 LwA Power Level Source:FHWA A Sound level at 50 feet Sound levels were modeled at nearby EDNA Class A properties by placing the equipment presented in the previous table within the construction areas shown in Figure 2. Table 4 shows the results of this modeling. Some cells in Table 4 are blank, this is due to the property being far from the construction area. Table 4. Predicted Nighttime Sound Levels during Sewer Bypass Work Construction Area Estimated duration of work Predicted Sound Levels Nighttime Sound Level Limit, L25A Bristol at Southport The Reserve Apartments South Homes CT109 Install: 5 days Removal: 5 days 62 dBA 70 dBA - 50 dBA CT108b Install: 5 days Removal: 5 days - - 69 dBA 50 dBA CT108a Install: 5 days Removal: 5 days - - 74 dBA 50 dBA A City of Renton Nighttime Sound Level Limits As shown in the previous tables and figures, predicted sound levels during nighttime sewer bypass work exceed nighttime sound level limits at nearby Class A EDNA properties. Therefore, a noise variance from the City of Renton will be required for this work to occur during nighttime hours. Table 13 provides the recommended sound level limits a variance should grant to allow this nightwork to take place. January 18, 2019 Page 10 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 In addition to the predicted sound levels at nearby EDNA Class A properties, the City has requested predicted sound levels 300 feet from the construction area. These sound levels can be found in the following table. Table 5. Predicted Sound Levels 300 feet from Bypass Install & RemovalA Receiving Location Predicted Sound Level, LEQ 300 ft from Construction Area 65-69 dBA A When measured from the center of construction area Bypass Pumping and Pipe Lining Once the bypass sewer is installed, bypass pumping and pipe lining can begin. Nightwork for this phase of construction will consist of two main activities; bypass pumping at the north staging area and the pipe lining process along the mainline sewer. Bypass pumping will occur continuously at the north staging area. The pipe lining process requires access to three manholes simultaneously. One manhole is used for pipe access for the Linabond pipe lining system and manholes upstream and downstream of the work area are used for the ventilation and odor control. Pipe lining and the ventilation and odor control will occur simultaneously. Activities at the north staging area consist of only bypass pumping and odor control. While up to eight electric bypass pumps may operate during daytime hours, only three are anticipated to run during nighttime hours, apart from any emergency periods. The odor control unit will operate continuously during nighttime hours. Table 6 and Table 7 show bypass pumping equipment sound levels and predicted unmitigated sound levels. Figure 3 shows anticipated equipment locations within the North Staging Area. Table 6. Bypass Pumping and Odor Control Equipment Sound Levels Equipment Sound Power Level Electric Bypass Pump 97 LwA Odor Control Unit 74 LwA Source: Equipment Vendors, Carollo Engineers, Inc. January 18, 2019 Page 11 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 3. Modeled Equipment Locations Source: The Greenbusch Group, Inc., Bing Maps, Carollo Engineers, Inc. Table 7. Unmitigated Predicted Nighttime Operation Sound Levels Receiving Property EDNA Predicted Sound Level, LEQ Nighttime Sound Level Limit, L25A Gene Coulon Beach Park Class A 38 dBA 50 dBA The Bristol at Southport Class A 51 dBA 50 dBA Southport on Lake Washington Class B 46 dBA None The Reserve Apartments Class A 56 dBA 50 dBA A City of Renton Nighttime Sound Level Limits January 18, 2019 Page 12 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Predicted unmitigated sound levels from nighttime operations exceed regulatory criteria at nearby EDNA Class A properties. Therefore, it is recommended that a noise variance from the City of Renton be obtained for this work. It is recommended only the northern three bypass pumps operate during nighttime hours and a noise barrier be placed between these bypass pumps and The Reserve Apartments. The barrier should be constructed such that the pumps are not visible from anywhere on The Reserve Apartment’s parcel. The barrier should include two sheets of ¾ inch plywood with at least a 2 inch air gap between the sheets or outdoor noise curtains with a mass of at least 2 pounds per square foot attached to a fence. The noise barrier should have no gaps or breaks and meet flush with the ground. Appendix A includes a Specification Data Sheet for a typical outdoor noise curtain which could be used in this instance. The barrier should be placed as close to the pumps as possible and be approved by a Structural Engineer. A modeled barrier with a length of 50 feet, a height of 8 feet, and spaced 6 feet from the pumps as seen in Figure 4 was used to predict the effectiveness of the described noise barrier. Predicted sound levels with the modeled noise barrier are presented in Table 8 and Figure 5. Predicted mitigated sound levels 300 feet from the electric bypass pumps can be found in Table 9. Table 8. Mitigated Predicted Nighttime Operation Sound Levels Receiving Property EDNA Predicted Sound Level, LEQ Nighttime Sound Level Limit, L25A Gene Coulon Beach Park Class A 40 dBA 50 dBA The Bristol at Southport Class A 53 dBA 50 dBA Southport on Lake Washington Class B 48 dBA None The Reserve Apartments Class A 44 dBA 50 dBA A City of Renton Nighttime Sound Level Limits Table 9. Mitigated Predicted Nighttime Operation Sound Levels at 300 feetA Receiving Location Predicted Sound Level, LEQ North 57 dBA West 56 dBA East 55 dBA South 54 dBA A When measured from the bypass pumps. January 18, 2019 Page 13 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 4. Modeled Noise Barrier, South Facing Source: The Greenbusch Group, Inc., Google Maps, Carollo Engineers, Inc Reserve Apartments Noise Barrier Bypass Pumps January 18, 2019 Page 14 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 5. Predicted Mitigated Nighttime Sound Levels, dBA Source: The Greenbusch Group, Inc., Google Maps, City of Renton, Carollo Engineer, Inc. In the event of noise complaints during bypass pumping from properties north of the North Staging Area, a noise barrier could be placed on all sides of the active bypass pumps. This noise barrier should be of the same construction as the noise barrier previously described. If the barrier is constructed of plywood, acoustical absorption should be placed on the interior walls. During some periods of nighttime construction, pipe lining will occur at the same time as bypass pumping and therefore the cumulative sounds must be analyzed. The following analysis predicts sound levels from the nighttime pipe lining combine d with mitigated sounds from the bypass pumping at the north staging area . The pipe lining process will need to occur during nighttime hours at four manholes. Access for pipe lining will occur at three manholes and the necessary ventilation and odor control will occur at the same time at manholes upstream and downstream of the work area. These locations are shown in the following figure. Reserve Apartments Southport on Lake Wash. Bristol at Southport 300’ from Pumps January 18, 2019 Page 15 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Figure 6. Nighttime Pipe Lining Access Areas (Manholes) Source: King County iMap., Bing Maps, City of Renton, Carollo Engineers, Inc. January 18, 2019 Page 16 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 Nighttime pipe lining will require the use of a combination of the Linabond pipe lining system, light-plants, ventilation and odor control. Sound levels for this equipment are based on data found in FHWA, information provided by Carollo Engineers and various manufacturers. Table 10 shows the equipment’s sound levels along with the usage factor. Table 10. Pipe Lining Equipment Sound Levels Equipment Usage Factor Sound Level Metric Light Tower 100% 95 LwA Power Level Supply & Spray-Rig Truck 40% 80 dBAA Lmax (slow) Air Scrubber 100% 74 LwA Power Level Dehumidifier 100% 99 LwA Power Level Blower 100% 103 LwA Power Level Heater 100% 94 LwA Power Level Generator 100% 97 LwA Power Level Source: FHWA, Carollo Engineers and various manufacturers A Sound level at 50 feet Sound levels were modeled at nearby EDNA Class A properties by placing the equipment presented Table 10 within the construction areas shown in Figure 6. A noise barrier should be placed between the Supply and Spray-Rig Truck at manhole R02-07 and the Reserve Apartments. A noise barrier should also be placed between ventilation at manhole R01-32 and the South Homes. These barriers should be the same construction as the bypass pump’s noise barrier. The trucks or fans should not be visible from anywhere on nearby EDNA Class A properties with the noise barrier in place. Table 11 shows the results of this modeling with the recommended noise barriers. Some cells in Table 11 are blank, this is due to the receptor being far from the construction area. Table 11. Predicted Mitigated Nighttime Sound Levels during Pipe Lining & Bypass Pumping Construction Area Estimated duration of work Predicted Sound Levels Nighttime Sound Level Limit, L25A Bristol at Southport Reserve Apartments South Homes R02-07 (Supply & Spray-Rig Truck) R02-06 (Ventilation & Odor Control) 2 months 56 dBA 56 dBA - 50 dBA R02-01 (Supply & Spray-Rig Truck) R01-32 (Ventilation only) 2 months 53 dBA 44 dBA 57 dBA 50 dBA A City of Renton Nighttime Sound Level Limits January 18, 2019 Page 17 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 As shown in the previous tables and figures, predicted sound levels during pipe lining exceeds nighttime sound level limits. Therefore, a noise variance from the City of Renton will be required for this work. Table 13 provides the recommended sound level limits a variance should grant for this nightwork to take place. In addition to the predicted sound levels at nearby EDNA Class A properties, the City has requested sound levels 300 feet from the construction area. These sound levels can be found in the following table. Table 12. Predicted Sound Levels 300 feet from Nighttime Pipe LiningA Receiving Location Predicted Sound Level, LEQ 300 Feet from Construction Area 54-63 dBA A When measured from the center of construction area Requested Noise Variance Sound Levels & Noise Monitoring The following table presents recommended sound level limits to be granted by a noise variance for the anticipated nightwork. Table 13. Requ ested Noise Variance Sound Level Limits for Nightwork Construction Area Estimated Duration of Work Requested Variance Sound Level Limits at Class A EDNAs, Leq(H) Nighttime Sound Level Limit, L25A Sewer Bypass CT109 10 days two 5 day periods 70 dBA 50 dBA CT108b 10 days two 5 day periods 70 dBA 50 dBA CT108a 10 days two 5 day periods 75 dBA 50 dBA Bypass Pumping & Odor Control Only North Staging Area 8 months 55 dBA 50 dBA Linabond, Bypass Pumping & Odor Control R02-07 & R02 -06 2 months 56 dBA 50 dBA R02-01 & R01 -32 2 months 57 dBA at South Homes 55 dBA at Bristol & Reserve Apt. 50 dBA A City of Renton Nighttime Sound Level Limits Noise monitoring should be performed during nighttime sewer bypass installation and removal at the nearest EDNA Class A property to show compliance with noise variance sound level limits. Noise monitoring should also be performed during nighttime pipe lining at the nearest EDNA Class A property. Given the constant nature of bypass pumping and odor control, once pipe lining work is finished at manhole R02-07 and R02-06, noise monitoring should be January 18, 2019 Page 18 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 performed at The Reserve Apartments and Bristol Apartments until compliance is proven over a 1 week period. Daytime – Construction & Pipe Lining Construction, restoration, and the Linabond pipe lining process are expected to also occur during weekday, daytime hours and are therefore exempt from the City of Renton sound level limits. Bypass pumping and odor control will occur continuously during daytime hours and is also exempt from the City of Renton sound level limits. All daytime operations will be required to satisfy King County’s Guide Specification sound level limits. Sound originating from equipment or construction activity during daytime is assessed at 50 feet, per Section 01 35 43 of the Guide Specification. Anticipated daytime equipment and their respective sound levels can be found in Table 14. Table 14. Construction Equipment Sound Levels Equipment Sound Level at 50 ft Sound Level Limit at 50 ftC Construction Front End Loader 80 dBA A 85 dBA Excavator 85 dBA A 85 dBA Back Hoe 80 dBA A 85 dBA Concrete Saw 90 dBA A 90 dBA Vibratory Pile Driver 95 dBA A 95 dBA Impact Pile Driver 95 dBA A 95 dBA Pipe Lining System (Linabond) Supply and Spray-Rig Truck 80 dBA A 85 dBA 300 kW Genset 65 dBA 85 dBA 150 kW In -Line Heater 62 dBA 85 dBA 10 HP Blower 71 dBA 85 dBA 5000 CFM Dehumidifier 67 dBA 85 dBA 1000 CFM Air Scrubber 43 dBA 85 dBA Bypass Pumping and Odor Control Electric Bypass Pump 65 dBA B 85 dBA Odor Control Unit 42 dBA B 85 dBA A Table 9.1 FHWA Construction Noise and Vibration Handbook (LSmax) B Carollo Engineers, Inc. C King County Guide Specification Section 01 35 43 January 18, 2019 Page 19 Eastside Interceptor Section 2 Rehabilitation Phase II - Noise Study The Greenbusch Group, Inc. p) 206.378.0569 f) 206.378-0641 www.greenbusch.com 1900 West Nickerson Street, Suite 201 Seattle, WA 98119 All daytime equipment and activities are expected to satisfy King County Guide Specification sound level limits. However, the King County Guide Specification only sets criteria for each piece of operating equipment and does not consider the cumulative sound levels of all operating equipment. Therefore, it is recommended that sound originating from daytime construction activities and the Linabond system not exceed an hourly LEQ of 85 dBA 50 feet from the construction boundary or at residential-use receptors when measured at the building envelop, whichever is further. It is recommended that the contractor implement the following to help meet the recommended sound level limits: • Use only ambient-sensing broadband back-up alarms and minimize backing. • Noisy equipment and construction activities should be placed or performed as far as possible from noise sensitive receptors. • Monitor noise levels during construction. Additionally, the following may be implemented if further mitigation is required to meet the recommended sound level limits: • Limit engine idling to 5 minutes or less. • Use radios for long-range communication; only use raised voices and public address systems in an emergency. • Use upgraded engine exhaust mufflers, engine shrouds, or sound enclosures on noisier equipment. • Install noise barrier or noise curtains of similar design to what is previously described around noisier equipment. • Use electric and hydraulic equipment in lieu of diesel of pneumatic equipment. • Perform impact work during times of high ambient sound levels. Emergency Periods – Daytime and Nighttime The RMC adopts Section 173-60-050 of the WAC. Section 173-60-050 of the WAC exempts all sound created by emergency equipment and work necessary for the health, safety and welfare of the community. It is our interpretation that additional bypass pumping and the use of backup generators during emergency periods would be exempt from the City of Renton sound level limits. Appendix A Noise Curtain Specification Data Sheet Spec Data Sheet NOISE BARRIERS BBC-SERIES NOISE BARRIERS/SOUND ABSORBER COMPOSITES 50 H.P. Almgren Drive x Agawam, MA 01001 x Ph 413.789.1770 fax 413.789.2248 www.soundseal.com BBC-13X-2 LB-2”Sound Curtains Sound Seal’s BBC-13X-2 LB-2” offers the benefits of both a noise barrier and a sound absorber for outdoor applications. This product consists of a two-inch thick vinyl-coated- fiberglass-cloth faced quilted fiberglass that is bonded to a two-pound per sq. ft. reinforced loaded vinyl noise barrier. “X” style Sound Curtain panels are constructed with grommets across the top and bottom, and exterior grade Velcro seals along the vertical edges. The product is also available in roll form with edges bound or unbound. x Class A (or 1) flammability rated per ASTM E- 84 x For Indoor or Outdoor Applications x Available facing colors on quilt: gray, tan, black or off-white x Available barrier colors: gray, tan, blue or olive drab Applications: With its 7+ year life span* in the harshest environments, this product is typically used as a temporary noise barrier on outdoor applications such as construction site noise mitigation projects. Also available with a one-pound psf noise barrier or a one-inch thick quilted fiberglass sound absorber. Product Data: Description Vinyl coated fiberglass cloth facing on 2” quilted fiberglass/ 2 lb-psf reinforced loaded vinyl noise barrier Flammability Flame Spread: 23.0 Smoke density: 30.0 Nominal thickness 2.0 inches Temperature range -20q to +180q F Standard roll size 54” wide x 25’ long Weight ` 2.45 lb psf Acoustical Performance: Sound Transmission Loss OCTAVE BAND FREQUENCIES (Hz) Product 125 250 500 1000 2000 4000 STC BBC-13X-2lb-2” 19 25 33 46 53 58 37 ASTM E-90 & E 413 Sound Absorption Data OCTAVE BAND FREQUENCIES (Hz) Product 125 250 500 1000 2000 4000 NRC BBC-13X-2lb-2” .07 .27 .96 1.13 1.08 .99 .85 ASTM C 423 * when properly installed.