Silverado Village Project

Transcription

1 Environmental Noise Assessment Silverado Village Project Elk Grove, California BAC Job # Prepared For: Vintara Holdings, LLC Attn: Mr. Paul Eblen 140 Diamond Creek Place Roseville, CA Prepared By: Bollard Acoustical Consultants, Inc. Paul Bollard, President April 9, Bankhead Road < Loomis, CA < Phone: (916) < Fax: (916) < BACNOISE.COM

2 Bollard Acoustical Consultants, Inc. (BAC) Introduction This Noise Study Report was prepared for the proposed Silverado Village project in the City of Elk Grove, California. The proposed project consists of the creation of 660 single-family residential lots on acres, an age restricted multi-family lodge and Village Center on 4.6 acres, 79.4 acres of open space and nature preservation area, 5.8 acres of parks, 3.4 acres of landscape entry/corridors, a detention area of 15.7 acres and 5.7 acres of major roads. Figure 1 shows the project area and Figure 2 shows the project site plan. Bollard Acoustical Consultants, Inc. was retained by the project applicant to prepare this analysis of potential noise impacts and to provide mitigation measures where appropriate. The following specific noise sources are evaluated in this assessment: Bond and Waterman Road traffic noise. Increases in off-site traffic noise resulting from the project. Potential noise generated by future commercial uses located at the southeast quadrant of the project site. Project construction noise. Noise generated at the proposed park sites. Cumulative noise conditions Fundamentals of Noise Noise is often defined simply as unwanted sound, and thus is a subjective reaction to characteristics of a physical phenomenon. Researchers have generally agreed that A-weighted sound pressure levels (sound levels) are very well correlated with community reaction to noise. The unit of sound level measurement is the decibel (db), sometimes expressed as dba. Variations in sound levels over time are represented by statistical descriptors, and by timeweighted composite noise metrics such as the Day-Night Average Level (L dn ), or the Community Noise Equivalent Level (CNEL). Throughout this analysis, A-weighted sound pressure levels will be used to describe community noise unless otherwise indicated. The decibel notation used for sound levels describes a logarithmic relationship of acoustical energy, so that sound levels cannot be added or subtracted in the conventional arithmetic manner. For example, a doubling of acoustical energy results in a change of 3 decibels (dba), which is usually considered to be barely perceptible. A 10-fold increase in acoustical energy yields a 10 decibel change, which is subjectively like a doubling of loudness. Appendix A provides definitions of acoustical terms used in this report. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 1

3 Bollard Acoustical Consultants, Inc. (BAC) Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 2

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5 Bollard Acoustical Consultants, Inc. (BAC) Noise Exposure Criteria City of Elk Grove The City of Elk Grove Noise Element of the General Plan establishes acceptable noise level limits for transportation (such as traffic), and non-transportation noise sources. Table 1 contains the City s noise standards applicable to transportation sources and Table 2 contains the City s noise standards applicable to non-transportation noise sources. Table 1 Maximum Allowable Noise Exposure Transportation Noise Sources Land Use Outdoor Activity Areas 1 L dn /CNEL, db Interior Spaces L dn /CNEL, db L eq, db Residential Residential subject to noise from railroad tracks, aircraft overflights, or similar noise sources which produce clearly identifiable, discrete noise events (the passing of a single train, as opposed to relatively steady noise sources such as roadways) Playgrounds, Neighborhood Parks Where the location of outdoor activity areas is unknown, the exterior noise level standard shall be applied to the property line of the receiving land use. Where it is not practical to mitigate exterior noise levels at patio or balconies of apartment complexes, a common area such as a pool or recreation area may be designated as the outdoor activity area. 2 Where it is not possible to reduce noise in outdoor activity areas to 60 db L dn/cnel or less using a practical application of the best available noise reduction measures, an exterior noise level of up to 65 db Ldn/CNEL may be allowed provided that available exterior noise level reduction measures have been implemented and interior noise levels are in compliance with this table. 3 The intent of this noise standard is to provide increased protection against sleep disturbance for residences located near railroad tracks. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 4

6 Bollard Acoustical Consultants, Inc. (BAC) Table 2 Performance Standards for Typical Stationary Noise Sources Noise Level Descriptor Daytime (7 am 10 pm) Nighttime (10 pm 7 am) Hourly Leq, db The standards above will apply generally to noise sources that are not tonal, impulsive, or repetitive in nature. Typical noise sources in this category would include HVAC systems, cooling towers, fans, blowers, etc. Where the noise source in question is tonal, impulsive or repetitive in nature, or which consists primarily of speech or music, the noise standards shown in Table 2 are reduced by 5 db. Criteria for Assessing Project-Related Traffic Noise Increases The following table was developed by the Federal Interagency Committee on Noise (FICON) as a means of developing thresholds for identifying project-related noise level increases. The rationale for the graduated scales is that test subject s reactions to increases in noise levels varied depending on the starting level of noise. Specifically, with lower ambient noise environments, such as those below 60 db Ldn, a larger increase in noise levels was required to achieve a negative reaction than was necessary in environments where noise levels were already elevated. Therefore, because the County does not have defined thresholds for what would be considered a substantial increase in noise levels, information from Table 3 is used. Table 3 Significance of Changes in Cumulative Noise Exposure Ambient Noise Level Without Project, L dn Increase Required for Significant Impact <60 db +5.0 db or more db +3.0 db or more >65 db +1.5 db or more Source: Federal Interagency Committee on Noise (FICON). Traffic Noise Evaluation Traffic Noise Prediction Methodology To describe projected noise levels due to traffic, Bollard Acoustical Consultants, Inc. employs the Federal Highway Administration (FHWA) Highway Traffic Noise Prediction Model (FHWA RD ). The model is based upon the Calveno reference noise factors for automobiles, medium trucks and heavy trucks, with consideration given to vehicle volume, speed, roadway configuration, distance to the receiver, and the acoustical characteristics of the site. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 5

7 Bollard Acoustical Consultants, Inc. (BAC) Traffic Noise Prediction Model Calibration for Bond and Waterman Roads On August 18, 2011, Bollard Acoustical Consultants, Inc. conducted noise level measurements and concurrent counts of both Waterman Road and Bond Road traffic at the project site. The purpose of the short-term traffic noise level measurements is to determine the accuracy of the FHWA model in describing the existing traffic noise at the project site, accounting for shielding from local topography, actual travel speeds, and roadway grade. Noise measurement results were compared to the FHWA model results by entering the observed traffic volume, speed and distance as inputs to the FHWA model. Based upon the calibration results shown in Appendix B, an offset of -3 db was applied to FHWA model for the prediction of future Waterman Road traffic noise levels. Predicted Future (Cumulative) Traffic Noise Levels at the Project Site Average daily traffic volumes for future conditions (2025) were obtained from traffic data, used for the Elk Grove General Plan Noise Element. The day/night distribution and truck percentages were derived from Bollard Acoustical Consultants, Inc. file data for similar roadways. Estimated future traffic speed assumptions were based on posted speed limits and field observations. The FHWA Model inputs are contained in Appendix C. The FHWA model was used with the Appendix C data to predict future traffic noise levels at the project site. The results of that analysis are shown in Table 4. Table 4 Predicted Future Traffic Noise Levels Silverado Village Project Elk Grove, California Distance to Noise Contours (feet) 1 Bond Road Location Noise Level, L dn 60 db L dn 65 db L dn Lots 9-11 Lot 12-21, 66, Waterman Road Lots db 70 db 61 db Lots db Lots 39-46, db 1 Predicted distances to noise level contours are from the roadway centerline. Note: A complete listing of FHWA Model inputs and results is provided in Appendix C. The Table 4 data indicate that the residences proposed nearest to Bond Road and Waterman Road would be exposed to future traffic noise levels which exceed the City of Elk Grove 60 db L dn exterior noise level standard. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 6

8 Exterior Traffic Noise Mitigation for Bond and Waterman Roads Bollard Acoustical Consultants, Inc. (BAC) To achieve compliance with the City of Elk Grove 60 db L dn exterior noise level standard, Bollard Acoustical Consultants, Inc. evaluated the effectiveness of constructing solid noise barriers adjacent to Bond Road and Waterman Road. The FHWA Model traffic noise barrier insertion loss methodology was used to determine the noise reduction which would be provided by noise barriers of various heights. The summarized results of the FHWA barrier analysis for the proposed residences located nearest to Bond Road and Waterman Road are contained in Table 5. The complete inputs and results of the barrier analysis are provided in Appendix D. Table 5 Predicted Future Traffic Noise Levels with Various Noise Barrier Heights Silverado Village Project Elk Grove, California Road Location Distance (feet) Unmitigated Exterior Noise Level, L dn Barrier Height (feet) Predicted Exterior Noise Level, L dn Bond Road Lots Lots 12-21, 66, Lots Waterman Road Lots Lots 39-46, Note: All barriers are assumed to be located at the property lines of the residential uses adjacent to Bond Road and Waterman Road. Barrier heights are relative to the proposed building pad elevations. Distances are measured from the roadway centerline. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 7

9 Bollard Acoustical Consultants, Inc. (BAC) The Table 5 data indicate that noise barriers ranging from 6 to 9 feet in height would be required to reduce future Bond Road and Waterman Road traffic noise levels to 60 db L dn or less at the proposed backyard areas located nearest to those roadways. The barriers could take the form of a masonry wall, earthen berm, or combination of the two, and should wrap away from the roadway at the barrier ends, as indicated in Figure 2. Prediction of Interior Traffic Noise Levels within Project Residences Residences Along Bond Road The Table 4 data indicate that future Bond Road noise levels at unshielded first-floor locations would be approximately 70 db L dn. Following construction of a property line noise barrier, future traffic noise levels at first-floor facades will be approximately 60 db L dn. Due to reduced ground attenuation at elevated positions, second floor noise levels are generally 2 db higher than unshielded first floor locations (72 db L dn or less). To achieve compliance with the City of Elk Grove 45 db L dn interior noise level standard at exposed second-floor rooms adjacent to Bond Road, building facade noise level reductions of 27 db or less would be required. At first-floor facades, a building facade noise reduction of 15 db would be required. Standard residential construction (stucco, STC-28 windows, door weather-stripping, exterior wall insulation, composition plywood roof), results in an exterior to interior noise reduction of at least 25 db with windows closed and approximately 15 db with windows open. Therefore, standard construction would be acceptable for shielded first-floor facades, but would fail to provide the required noise reduction at elevated (unshielded) second-floor facades. To achieve the required degree of noise reduction at the second floor facades located adjacent to Bond Road, all second-floor windows from which Bond Road is visible should be upgraded to an STC rating of 30. In addition, mechanical ventilation (air conditioning) should be provided to allow the occupants to close doors and windows as desired for additional acoustical isolation. Residences Along Waterman Road The Table 3 data indicate that future Waterman Road noise levels at unshielded first-floor locations would be approximately 64 db L dn. Following construction of a property line noise barrier, future traffic noise levels at first-floor facades will be approximately 58 db L dn. Due to reduced ground attenuation at elevated positions, second-floor noise levels are generally 2 db higher than unshielded first floor locations (66 db L dn or less). To achieve compliance with the City of Elk Grove 45 db L dn interior noise level standard at exposed second-floor rooms adjacent to Waterman Road, building facade noise level reductions of 21 db or less would be required. At first-floor facades, a building facade noise reduction of 15 db would be required. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 8

10 Bollard Acoustical Consultants, Inc. (BAC) Standard residential construction (stucco, STC-28 windows, door weather-stripping, exterior wall insulation, composition plywood roof), results in an exterior to interior noise reduction of at least 25 db with windows closed and approximately 15 db with windows open. Therefore, standard construction would be acceptable for both first and second-floor facades of this development. Mechanical ventilation (air conditioning) should be provided to allow the occupants to close doors and windows as desired for additional acoustical isolation. Predicted Increases in Off-Site Traffic Noise Levels Resulting from the Project The FHWA Model was used to predict existing and existing plus project traffic noise levels for the major local roadways which would be used by project traffic. The complete FHWA Model inputs and results are provided in Appendices E & F. Tables 6 & 7 show the predicted existing and future (cumulative) traffic noise levels, respectively, both with and without the project at a normalized distance of 100 feet from the roadway centerlines. Tables 6 and 7 also show the project-related increase in traffic noise levels along those roadways. Table 6 Predicted Existing Traffic Noise Levels with and without the Proposed Project Silverado Village Project Elk Grove, California Segment Roadway Name Segment Description E E+P 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd South of Bond Rd Crowell Dr. South of Bond Rd Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd Source: Fehr & Peers Associates, FHWA Model (RD ), and BAC file data. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 9

11 Bollard Acoustical Consultants, Inc. (BAC) Table 7 Predicted Future (Cumulative) Traffic Noise Levels with and without the Proposed Project Silverado Village Project Elk Grove, California Segment Roadway Name Segment Description C C+P 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd. N/A N/A N/A 9 South of Bond Rd. N/A N/A N/A 10 Crowell Dr. South of Bond Rd. N/A N/A N/A 11 Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd Source: City of Elk Grove General Plan EIR, FHWA Model (RD ), and BAC file data. N/A = cumulative traffic volume data for these roadways was not available in the City s General Plan EIR. The Table 6 and 7 data indicate that increases in off-site traffic noise levels resulting from the additional traffic generated by the proposed project would range from 0-1 db. Because this range of increases is below the significance criteria identified in Table 3, this impact would be considered less than significant. Park Noise Generation As indicated in Figure 2, the project proposes two park areas. Specifically, a roughly 5-acre park is proposed at the northern portion of the project site on Lot F, and a 0.6-acre park is proposed in the south-central portion of the project site on Lot J. No designs have been developed for these parks at this time, but it is known that the Lot J park would be provided for passive recreation only due to its small size, and that active recreation would occur at the northern park site (Lot F). Given the passive recreation usage of Lot J, no adverse noise impacts are anticipated from this park usage. Although no design has been developed for the Lot F park, it would likely include active recreation areas such as baseball diamonds and soccer fields. The most significant noise sources associated with the future park usage would likely be crowd cheering during baseball and soccer games. Reference noise level data collected by BAC staff at soccer and baseball facilities indicates that average noise levels during games can be expected to be approximately 55 db Leq at a distance of 100 feet from the center of the soccer field or pitcher s mound. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 10

12 Bollard Acoustical Consultants, Inc. (BAC) Because of the intervening A Street, the nearest proposed residential outdoor activity areas (backyards) in the Silverado development would be located at least 200 feet from the center of the soccer fields or baseball pitcher s mounds. At that distance, noise generated during intensive use of those facilities would be reduced to less than 50 db Leq. In addition, because the nearest residences will front on A-Street, the rear yard areas (primary outdoor activity areas) of those nearest residences would be shielded from view of park activities by the intervening residential structures. This shielding is expected to further reduce park-generated noise by at least 5 db in those backyards. The resulting exterior noise exposure would be approximately 45 db Leq or less during intensive park usage, which is well within compliance with the City s 55 db Leq daytime noise level standard shown in Table 2. As a result, noise impacts associated with normal park usage are not anticipated to be significant at nearby residences provided park activities are limited to daytime hours (10 pm 7 am). Construction Noise During the construction phases of the proposed project, noise from construction activities would add to the noise environment in the immediate project vicinity. Activities involved in typical construction would generate maximum noise levels, as indicated in Table 8, ranging from 85 to 90 db at a distance of 50 feet. Construction activities are proposed to occur during normal daytime working hours. Because project construction in the immediate vicinity of existing residences would be of short duration and would be limited to daytime hours, no adverse noise impacts are identified for project construction activities. Type of Equipment Table 8 Construction Equipment Noise Maximum Level, db at 50 feet Bulldozers 87 Heavy Trucks 88 Backhoe 85 Pneumatic Tools 85 Portable Crushing Plant 90 Source: Environmental Noise Pollution, Patrick R. Cunniff, Bollard Acoustical Consultants file data for portable crushing plants, Future Off-Site Commercial Activity According to the project site plans, the property located adjacent to the southeast corner of the project site (at the corner of Waterman and Bond Roads), is proposed for future commercial uses. Because the specific nature of the future commercial use which would be located at that site is unknown, a detailed impact assessment cannot be performed relative to this future activity at this time. However, such an assessment would be required when specific plans have been developed for this commercial site, with any noise mitigation required of the commercial use to be implemented at that time by the commercial applicant. Specific aspects of the Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 11

13 Bollard Acoustical Consultants, Inc. (BAC) commercial use which should be evaluated when a specific application has been filed for the commercial use would include loading dock activities, rooftop and ground-mounted mechanical equipment, parking lot movements, and any other significant noise-generating activities which may be associated with the proposed use. Conclusions Portions of the Silverado Village project site will be exposed to future Bond Road and Waterman Road traffic noise levels which exceed the exterior noise level standards applied to new residential developments by the City of Elk Grove. The following noise mitigation measures should be utilized to achieve compliance with the City s noise standards: A uniform 9-foot tall noise barrier should be constructed along the south property lines of all proposed residential uses adjacent to Bond Road to reduce future traffic noise levels to 60 db L dn or less within proposed backyards. The recommended barrier should wrap at the ends as indicated in Figure 2. A uniform 6-foot tall noise barrier should be constructed along the eastern property lines of Waterman Road to reduce future traffic noise levels to 60 db L dn or less at proposed backyard areas located adjacent to that roadway. The recommended barrier should wrap at the ends as indicated in Figure 2. Air conditioning should be included in all residences constructed in the Silverado Village development to allow occupants to close doors and windows as desired to achieve additional acoustic isolation from traffic noise in the project vicinity. These conclusions are based on the site plan shown in Figure 2, Bollard Acoustical Consultants, Inc. site observations, and the traffic assumptions stated in this report. Changes to the site plan or deviations from the assumptions cited herein could cause future noise levels to differ from those predicted in this analysis. Bollard Acoustical Consultants, Inc. is not responsible for degradation in acoustic performance of the residential construction due to poor construction practices or failure to comply with applicable building code requirements. Environmental Noise Analysis Silverado Village Elk Grove (Sacramento County) Page 12

14 Appendix A Acoustical Terminology Acoustics Ambient Noise Attenuation A-Weighting The science of sound. The distinctive acoustical characteristics of a given space consisting of all noise sources audible at that location. In many cases, the term ambient is used to describe an existing or pre-project condition such as the setting in an environmental noise study. The reduction of an acoustic signal. A frequency-response adjustment of a sound level meter that conditions the output signal to approximate human response. Decibel or db Fundamental unit of sound, A Bell is defined as the logarithm of the ratio of the sound pressure squared over the reference pressure squared. A Decibel is one-tenth of a Bell. CNEL Frequency Ldn Leq Lmax Loudness Masking Noise Peak Noise Community Noise Equivalent Level. Defined as the 24-hour average noise level with noise occurring during evening hours (7-10 p.m.) weighted by a factor of three and nighttime hours weighted by a factor of 10 prior to averaging. The measure of the rapidity of alterations of a periodic signal, expressed in cycles per second or hertz. Day/Night Average Sound Level. Similar to CNEL but with no evening weighting. Equivalent or energy-averaged sound level. The highest root-mean-square (RMS) sound level measured over a given period of time. A subjective term for the sensation of the magnitude of sound. The amount (or the process) by which the threshold of audibility is for one sound is raised by the presence of another (masking) sound. Unwanted sound. The level corresponding to the highest (not RMS) sound pressure measured over a given period of time. This term is often confused with the Maximum level, which is the highest RMS level. RT60 The time it takes reverberant sound to decay by 60 db once the source has been removed. Sabin SEL Threshold of Hearing Threshold of Pain The unit of sound absorption. One square foot of material absorbing 100% of incident sound has an absorption of 1 sabin. A rating, in decibels, of a discrete event, such as an aircraft flyover or train passby, that compresses the total sound energy of the event into a 1-s time period. The lowest sound that can be perceived by the human auditory system, generally considered to be 0 db for persons with perfect hearing. Approximately 120 db above the threshold of hearing.

15 Appendix B-1 FHWA Traffic Noise Prediction Model (FHWA-RD ) Calibration Worksheet Project Information: Weather Conditions: Sound Level Meter: Job Number: Project Name: Silverado Village Roadway Tested: Bond Road Test Location: On project site Test Date: August 18, 2011 Temperature (Fahrenheit): 67 Relative Humidity: Moderate Wind Speed and Direction: Calm Cloud Cover: Clear Sound Level Meter: Calibrator: Meter Calibrated: Meter Settings: LDL Model 820 LDL Model CAL200 Immediately before A-weighted, slow response Microphone: Roadway Condition: Test Parameters: Microphone Location: On project site Distance to Centerline (feet): 100 Microphone Height: 5 feet above ground Intervening Ground (Hard or Soft): Soft Elevation Relative to Road (feet): 5 Pavement Type Asphalt Pavement Condition: Good Number of Lanes: 4 Posted Maximum Speed (mph): 45 Test Time: Test Duration (minutes): Observed Number Automobiles: Observed Number Medium Trucks: Observed Number Heavy Trucks: Observed Average Speed (mph): 9:38 AM Model Calibration: Measured Average Level (L eq ): 62.0 Level Predicted by FHWA Model: 62.3 Difference: 0.3 db Conclusions:

16 Appendix B-2 FHWA Traffic Noise Prediction Model (FHWA-RD ) Calibration Worksheet Project Information: Weather Conditions: Sound Level Meter: Job Number: Project Name: Silverado Village Roadway Tested: Waterman Road Test Location: On project site Test Date: August 18, 2011 Temperature (Fahrenheit): 69 Relative Humidity: 58% Wind Speed and Direction: 4 mph W Cloud Cover: Clear Sound Level Meter: Calibrator: Meter Calibrated: Meter Settings: LDL Model 820 LDL Model CAL200 Immediately before A-weighted, slow response Microphone: Roadway Condition: Test Parameters: Microphone Location: On project site Distance to Centerline (feet): 100 Microphone Height: 5 feet above ground Intervening Ground (Hard or Soft): Soft Elevation Relative to Road (feet): 0 Pavement Type Asphalt Pavement Condition: Good Number of Lanes: 2 Posted Maximum Speed (mph): 55 Test Time: Test Duration (minutes): Observed Number Automobiles: Observed Number Medium Trucks: Observed Number Heavy Trucks: Observed Average Speed (mph): 10:14 AM Model Calibration: Measured Average Level (L eq ): 55.0 Level Predicted by FHWA Model: 59.9 Difference: 4.9 db Conclusions:

17 Appendix C-1 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Prediction Worksheet Project Information: Job Number: Project Name: Silverado Village Roadway Name: Bond Road Traffic Data: Year: Average Daily Traffic Volume: Percent Daytime Traffic: Percent Nighttime Traffic: Percent Medium Trucks (2 axle): Percent Heavy Trucks (3+ axle): Assumed Vehicle Speed (mph): Intervening Ground Type (hard/soft): , Soft Traffic Noise Levels: L dn, db Medium Heavy Location: Description Distance Offset (db) Autos Trucks Trucks Total 1 Lots Lots 12-21, 66, Traffic Noise Contours (No Calibration Offset): L dn Contour, db Distance from Centerline, (ft) Notes:

18 Appendix C-2 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Prediction Worksheet Project Information: Job Number: Project Name: Silverado Village Roadway Name: Waterman Road Traffic Data: Year: Average Daily Traffic Volume: Percent Daytime Traffic: Percent Nighttime Traffic: Percent Medium Trucks (2 axle): Percent Heavy Trucks (3+ axle): Assumed Vehicle Speed (mph): Intervening Ground Type (hard/soft): , Soft Traffic Noise Levels: L dn, db Medium Heavy Location: Description Distance Offset (db) Autos Trucks Trucks Total 1 Lots Lots Lots 39-46, Traffic Noise Contours (No Calibration Offset): L dn Contour, db Distance from Centerline, (ft) Notes:

19 Appendix D-1 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Barrier Effectiveness Prediction Worksheet Project Information: Noise Level Data: Site Geometry: Job Number: Project Name: Silverado Village Roadway Name: Bond Road Location(s): Lots 9-11 Year: 2025 Auto L dn, db: 69 Medium Truck L dn, db: 57 Heavy Truck L dn, db: 61 Receiver Description: Lots 9-11 Centerline to Barrier Distance (C 1 ): 65 Barrier to Receiver Distance (C 2 ): 15 Automobile Elevation: 0 Medium Truck Elevation: 2 Heavy Truck Elevation: 8 Pad/Ground Elevation at Receiver: 0 Receiver Elevation 1 : 5 Base of Barrier Elevation: 0 Starting Barrier Height 6 Barrier Effectiveness: Top of Barrier Elevation (ft) L dn, db Barrier Breaks Line of Sight to Barrier Height 2 (ft) Autos Medium Trucks Heavy Trucks Total Autos? Medium Trucks? Heavy Trucks? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Notes: 1.Standard receiver elevation is five feet above grade/pad elevations at the receiver location(s)

20 Appendix D-2 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Barrier Effectiveness Prediction Worksheet Project Information: Job Number: Project Name: Silverado Village Roadway Name: Bond Road Location(s): Lots 12-21, 66, Noise Level Data: Year: 2025 Auto L dn, db: 69 Medium Truck L dn, db: 57 Heavy Truck L dn, db: 62 Site Geometry: Receiver Description: Lots 12-21, 66, Centerline to Barrier Distance (C 1 ): 60 Barrier to Receiver Distance (C 2 ): 15 Automobile Elevation: 0 Medium Truck Elevation: 2 Heavy Truck Elevation: 8 Pad/Ground Elevation at Receiver: 0 Receiver Elevation 1 : 5 Base of Barrier Elevation: 0 Starting Barrier Height 6 Barrier Effectiveness: Top of Barrier Elevation (ft) L dn, db Barrier Breaks Line of Sight to Barrier Height 2 (ft) Autos Medium Trucks Heavy Trucks Total Autos? Medium Trucks? Heavy Trucks? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Notes: 1.Standard receiver elevation is five feet above grade/pad elevations at the receiver location(s)

21 Appendix D-3 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Barrier Effectiveness Prediction Worksheet Project Information: Noise Level Data: Site Geometry: Job Number: Project Name: Silverado Village Roadway Name: Waterman Road Location(s): Lots Year: 2025 Auto L dn, db: 60 Medium Truck L dn, db: 48 Heavy Truck L dn, db: 53 Receiver Description: Lots Centerline to Barrier Distance (C 1 ): 145 Barrier to Receiver Distance (C 2 ): 15 Automobile Elevation: 0 Medium Truck Elevation: 2 Heavy Truck Elevation: 8 Pad/Ground Elevation at Receiver: 0 Receiver Elevation 1 : 5 Base of Barrier Elevation: 0 Starting Barrier Height 6 Barrier Effectiveness: Top of Barrier Elevation (ft) L dn, db Barrier Breaks Line of Sight to Barrier Height 2 (ft) Autos Medium Trucks Heavy Trucks Total Autos? Medium Trucks? Heavy Trucks? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Notes: 1.Standard receiver elevation is five feet above grade/pad elevations at the receiver location(s)

22 Appendix D-4 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Barrier Effectiveness Prediction Worksheet Project Information: Job Number: Project Name: Silverado Village Roadway Name: Waterman Road Location(s): Lots Noise Level Data: Year: 2025 Auto L dn, db: 61 Medium Truck L dn, db: 49 Heavy Truck L dn, db: 54 Site Geometry: Receiver Description: Lots Centerline to Barrier Distance (C 1 ): 115 Barrier to Receiver Distance (C 2 ): 15 Automobile Elevation: 0 Medium Truck Elevation: 2 Heavy Truck Elevation: 8 Pad/Ground Elevation at Receiver: 0 Receiver Elevation 1 : 5 Base of Barrier Elevation: 0 Starting Barrier Height 6 Barrier Effectiveness: Top of Barrier Elevation (ft) L dn, db Barrier Breaks Line of Sight to Barrier Height 2 (ft) Autos Medium Trucks Heavy Trucks Total Autos? Medium Trucks? Heavy Trucks? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Notes: 1.Standard receiver elevation is five feet above grade/pad elevations at the receiver location(s)

23 Appendix D-5 FHWA Traffic Noise Prediction Model (FHWA-RD ) Noise Barrier Effectiveness Prediction Worksheet Project Information: Job Number: Project Name: Silverado Village Roadway Name: Waterman Road Location(s): Lots 39-46, 137 Noise Level Data: Year: 2025 Auto L dn, db: 63 Medium Truck L dn, db: 51 Heavy Truck L dn, db: 56 Site Geometry: Receiver Description: Lots 39-46, 137 Centerline to Barrier Distance (C 1 ): 85 Barrier to Receiver Distance (C 2 ): 15 Automobile Elevation: 0 Medium Truck Elevation: 2 Heavy Truck Elevation: 8 Pad/Ground Elevation at Receiver: 0 Receiver Elevation 1 : 5 Base of Barrier Elevation: 0 Starting Barrier Height 6 Barrier Effectiveness: Top of Barrier Elevation (ft) L dn, db Barrier Breaks Line of Sight to Barrier Height 2 (ft) Autos Medium Trucks Heavy Trucks Total Autos? Medium Trucks? Heavy Trucks? Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Notes: 1.Standard receiver elevation is five feet above grade/pad elevations at the receiver location(s)

24 Appendix E-1 FHWA-RD Highway Traffic Noise Prediction Model Data Input Sheet Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Existing Ldn Soft % Med. % Hvy. Offset Segment Roadway Name Segment Description ADT Day % Eve % Night % Trucks Trucks Speed Distance (db) 1 Bond Road West of Elk Grove Florin Rd. 24, Elk Grove Florin Rd. to Quail Cove Dr. 21, Quail Cove Dr. to Crowell Dr. 18, Crowell Dr. to Waterman Rd. 20, East of Waterman Rd. 15, Elk Grove Florin Road North of Bond Rd. 23, South of Bond Rd. 18, Quail Cove Dr. North of Bond Rd. 1, South of Bond Rd. 5, Crowell Dr. South of Bond Rd. 3, Waterman Rd. North of Sheldon Rd. 8, Sheldon Rd. to Bond Rd. 7, South of Bond Rd. 10, Sheldon Rd. West of Waterman Rd. 8, East of Waterman Rd. 5,

25 Appendix E-2 FHWA-RD Highway Traffic Noise Prediction Model Data Input Sheet Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Existing Plus Project Ldn Soft % Med. % Hvy. Offset Segment Roadway Name Segment Description ADT Day % Eve % Night % Trucks Trucks Speed Distance (db) 1 Bond Road West of Elk Grove Florin Rd. 25, Elk Grove Florin Rd. to Quail Cove Dr. 23, Quail Cove Dr. to Crowell Dr. 20, Crowell Dr. to Waterman Rd. 21, East of Waterman Rd. 17, Elk Grove Florin Road North of Bond Rd. 23, South of Bond Rd. 19, Quail Cove Dr. North of Bond Rd. 1, South of Bond Rd. 5, Crowell Dr. South of Bond Rd. 3, Waterman Rd. North of Sheldon Rd. 8, Sheldon Rd. to Bond Rd. 7, South of Bond Rd. 10, Sheldon Rd. West of Waterman Rd. 8, East of Waterman Rd. 5,

26 Appendix E-3 FHWA-RD Highway Traffic Noise Prediction Model Predicted Levels Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Existing Ldn Soft Medium Heavy Segment Roadway Name Segment Description Autos Trucks Trucks Total 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd South of Bond Rd Crowell Dr. South of Bond Rd Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd

27 Appendix E-4 FHWA-RD Highway Traffic Noise Prediction Model Predicted Levels Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Existing Plus Project Ldn Soft Medium Heavy Segment Roadway Name Segment Description Autos Trucks Trucks Total 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd South of Bond Rd Crowell Dr. South of Bond Rd Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd

28 Appendix F-1 FHWA-RD Highway Traffic Noise Prediction Model Data Input Sheet Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Future Ldn Soft % Med. % Hvy. Offset Segment Roadway Name Segment Description ADT Day % Eve % Night % Trucks Trucks Speed Distance (db) 1 Bond Road West of Elk Grove Florin Rd. 59, Elk Grove Florin Rd. to Quail Cove Dr. 31, Quail Cove Dr. to Crowell Dr. 31, Crowell Dr. to Waterman Rd. 31, East of Waterman Rd. 31, Elk Grove Florin Road North of Bond Rd. 48, South of Bond Rd. 39, Quail Cove Dr. North of Bond Rd. N/A South of Bond Rd. N/A Crowell Dr. South of Bond Rd. N/A Waterman Rd. North of Sheldon Rd. 22, Sheldon Rd. to Bond Rd. 22, South of Bond Rd. 23, Sheldon Rd. West of Waterman Rd. 25, East of Waterman Rd. 25,

29 Appendix F-2 FHWA-RD Highway Traffic Noise Prediction Model Data Input Sheet Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Future Plus Project Ldn Soft % Med. % Hvy. Offset Segment Roadway Name Segment Description ADT Day % Eve % Night % Trucks Trucks Speed Distance (db) 1 Bond Road West of Elk Grove Florin Rd. 60, Elk Grove Florin Rd. to Quail Cove Dr. 33, Quail Cove Dr. to Crowell Dr. 33, Crowell Dr. to Waterman Rd. 33, East of Waterman Rd. 33, Elk Grove Florin Road North of Bond Rd. 49, South of Bond Rd. 39, Quail Cove Dr. North of Bond Rd. N/A South of Bond Rd. N/A Crowell Dr. South of Bond Rd. N/A Waterman Rd. North of Sheldon Rd. 22, Sheldon Rd. to Bond Rd. 22, South of Bond Rd. 23, Sheldon Rd. West of Waterman Rd. 26, East of Waterman Rd. 26,

30 Appendix F-3 FHWA-RD Highway Traffic Noise Prediction Model Predicted Levels Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Future Ldn Soft Medium Heavy Segment Roadway Name Segment Description Autos Trucks Trucks Total 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd. N/A N/A N/A N/A 9 South of Bond Rd. N/A N/A N/A N/A 10 Crowell Dr. South of Bond Rd. N/A N/A N/A N/A 11 Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd

31 Appendix F-4 FHWA-RD Highway Traffic Noise Prediction Model Predicted Levels Project #: Description: Ldn/CNEL: Hard/Soft: Silverado Village Future Plus Project Ldn Soft Medium Heavy Segment Roadway Name Segment Description Autos Trucks Trucks Total 1 Bond Road West of Elk Grove Florin Rd Elk Grove Florin Rd. to Quail Cove Dr Quail Cove Dr. to Crowell Dr Crowell Dr. to Waterman Rd East of Waterman Rd Elk Grove Florin Road North of Bond Rd South of Bond Rd Quail Cove Dr. North of Bond Rd. N/A N/A N/A N/A 9 South of Bond Rd. N/A N/A N/A N/A 10 Crowell Dr. South of Bond Rd. N/A N/A N/A N/A 11 Waterman Rd. North of Sheldon Rd Sheldon Rd. to Bond Rd South of Bond Rd Sheldon Rd. West of Waterman Rd East of Waterman Rd