Appendix G Noise Modeling Files

Transcription

1 Appendix G Noise Modeling Files

2 County of Butte Rio d Oro Specific Plan Noise Study July 2014

3 Rio d Oro Specific Plan Noise Study Prepared for: JKB Development 2370 West Monte Vista Ave. Turlock, CA Prepared by: Rincon Consultants, Inc. 180 North Ashwood Avenue Ventura, California July 2014

4 This report prepared on 50% recycled paper with 50% post-consumer content.

5 Rio d Oro Specific Plan Noise Impact Study Rio d Oro Specific Plan Noise Study Table of Contents Page Project Description... 1 Setting... 2 Overview of Sound Measurement... 2 Sensitive Receptors... 3 Project Site Setting... 3 Regulatory Setting... 4 Impact Analysis... 6 Methodology and Significance Thresholds... 6 Construction Noise... 7 Long-Term Operational Noise Exposure... 9 Long-Term Regional Impacts... 9 References List of Tables Table 1 Summary of Proposed Specific Plan... 2 Table 2 Noise Monitoring Results... 4 Table 3 Exterior Noise Standards... 4 Table 4 Interior Noise Standards... 4 Table 5 Significance of Changes in Operational Roadway Noise Exposure... 7 Table 6 Typical Noise Levels at Construction Sites... 7 Table 7 Short Term Future and Cumulative Traffic Noise Impacts on Existing Development Appendices Appendix A -- Noise Measurements Appendix B Existing Conditions Appendix C Phase I 2015 Appendix D 2035 No Build Appendix E 2035 Build Out i County of Butte

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7 Rio d Oro Specific Plan Noise Impact Study RIO D ORO SPECIFIC PLAN BUTTE COUNTY, CALIFORNIA NOISE STUDY This report is an analysis of the potential noise impacts of the proposed Rio d Oro Specific Plan in County of Butte. The report has been prepared by Rincon Consultants, Inc. under contract to JKB Development for use by the County of Butte, in support of the environmental documentation being prepared pursuant to the California Environmental Quality Act (CEQA). The purpose of this study is to analyze the proposed specific plan s potential temporary noise impacts associated with construction activity and long-term noise impacts associated with project operation, including roadway noise from vehicle trips generated by the proposed plan. The analysis herein is based partially on the project traffic study prepared by KD Anderson and Associates, Inc. (March 2014). PROJECT DESCRIPTION The proposed Specific Plan Area would encompass approximately 689 acres. Approximately 413 acres would be developed (including a developed parkland); 276 acres would remain in environmental conservation and scenic open space (as shown in Table 1). The overall project would include residential, commercial, public facility, park and open space, and environmental conservation uses within five villages. The villages are further divided into neighborhoods. Figure 2-5, Rio d Oro Village Concept shows the proposed layout of the villages including the environmental conservation area boundary northeast of the SR 70/Palermo Road intersection. Figure 2-6, Land Use Plan, shows the breakdown of proposed uses within each village. As shown, Villages 1-4 would accommodate up to 2,700 residential units at varying densities ranging from medium density single-family residences to very high density condominiums. Residential density ranges between Medium (3 to 6 dwelling units per acre (du/ac), Medium High (6 to 14 du/ac), High (14 to 20 du/ac), and Very High (20 to 30 du/ac). Two commercial centers totaling approximately 248,000 square feet would be located within Village 5 southwest of the SR 70/Ophir Road intersection; one on either side of the primary arterial constructed through the northern portion of the Specific Plan. A highway commercial site is proposed at the northeast corner of the SR 70/Ophir Road intersection. Public facilities would include a school site (Village 3), a reclaimed water treatment and pump station and a public safety station capable of accommodating fire protection and law enforcement needs. A total of 65 acres would be developed for park (35 acres) uses and open space (30 acres) and 246 acres would be retained for environmental conservation purposes. Uses proposed within the Specific Plan are described in the sections below and summarized in Table 1. 1 County of Butte

8 Rio d Oro Specific Plan Noise Impact Study Table 1 Summary of Proposed Specific Plan Residential Gross Acres Units (+/-) Medium (3-6 du/ac) Medium High (6-14 du/ac) ,535 High (14-20 du/ac) Very High (20-30 du/ac) Subtotal ,700 maximum Non-Residential Gross Acres (+/-) Approximate Square Footage Retail and Business Services ,000 Highway Services ,000 Public Facility 25.9 Subtotal ,000 Parks Gross Acres (+/-) Linear Park 11.9 N/A Neighborhood Green 7.2 N/A Village Green 12.5 N/A Gateway Park 3.9 Subtotal 35.4 N/A Open Space Gross Acres (+/-) Environmental Conservation N/A Scenic Open Space 29.8 N/A Subtotal N/A Specific Plan Total N/A SETTING Overview of Sound Measurement Noise level (or volume) is generally measured in decibels (db) using the A-weighted sound pressure level (dba). The A-weighting scale is an adjustment to the actual sound pressure levels to be consistent with that of human hearing response, which is most sensitive to frequencies around 4,000 Hertz (about the highest note on a piano) and less sensitive to low frequencies (below 100 Hertz). Sound pressure level is measured on a logarithmic scale with the 0 db level based on the lowest detectable sound pressure level that people can perceive (an audible sound that is not zero sound pressure level). Based on the logarithmic scale, a doubling of sound energy is equivalent to an increase of 3 db, and a sound that is 10 db less than the ambient sound level has no effect on ambient noise. Because of the nature of the human ear, a sound must be about 10 db greater than the reference sound to be judged as twice as loud. In general, a 3 db change in community noise levels is noticeable, while 1-2 db changes generally are not perceived. Quiet suburban areas typically have noise levels in the range of dba, while arterial streets are in the 50-2 County of Butte

9 Rio d Oro Specific Plan Noise Impact Study 60+ dba range. Normal conversational levels are in the dba range, and ambient noise levels greater than 65 dba can interrupt conversations. Noise levels typically attenuate (or drop off) at a rate of 6 db per doubling of distance from point sources (such as industrial machinery). Noise from lightly traveled roads typically attenuates at a rate of about 4.5 db per doubling of distance. Noise from heavily traveled roads typically attenuates at about 3 db per doubling of distance. Noise levels may also be reduced by intervening structures; generally, a single row of buildings between the receptor and the noise source reduces the noise level by about 5 dba, while a solid wall or berm reduces noise levels by 5 to 10 dba. The manner in which older homes in California were constructed (approximately 30 years old or older) generally provides a reduction of exterior-to-interior noise levels of about 20 to 25 dba with closed windows. The exterior-to-interior reduction of newer residential units and office buildings is generally 30 dba or more (HMMH, 2006). In addition to the actual instantaneous measurement of sound levels, the duration of sound is important since sounds that occur over a long period of time are more likely to be an annoyance or cause direct physical damage or environmental stress. One of the most frequently used noise metrics that considers both duration and sound power level is the equivalent noise level (Leq). The Leq is defined as the single steady A-weighted level that is equivalent to the same amount of energy as that contained in the actual fluctuating levels over a period of time (essentially, the average noise level). Typically, Leq is summed over a one-hour period. Lmax is the highest RMS (root mean squared) sound pressure level within the measuring period, and Lmin is the lowest RMS sound pressure level within the measuring period. The time period in which noise occurs is also important since noise that occurs at night tends to be more disturbing than that which occurs during the day. Community noise is usually measured using Day-Night Average Level (Ldn), which is the 24-hour average noise level with a 10-dBA penalty for noise occurring during nighttime (10 p.m. to 7 a.m.) hours, or Community Noise Equivalent Level (CNEL), which is the 24-hour average noise level with a 5 dba penalty for noise occurring from 7 p.m. to 10 p.m. and a 10 dba penalty for noise occurring from 10 p.m. to 7 a.m. Noise levels described by Ldn and CNEL usually do not differ by more than 1 db. Sensitive Receptors The Butte County General Plan Health and Safety Element defines noise-sensitive land uses as locations where people reside or where the presence of unwanted sound could adversely affect the use of the land such as places where people live, sleep, recreate, worship, or study. Noise sensitive receptors near the plan area include the mobile home park just south of the plan area (between SR-70 and Pacific Heights Road) and the existing single-family homes just west of the plan area (between the plan area and Pacific Heights Road). Project Site Setting The most common and primary sources of noise in the project site vicinity are motor vehicles (e.g., automobiles, buses, trucks, and motorcycles) along State Route 70. Motor vehicle noise is of concern because it is characterized by a high number of individual events, which often create a sustained noise level, and because of its proximity to noise sensitive uses. Along the stretch of 3 County of Butte

10 Rio d Oro Specific Plan Noise Impact Study SR-70 to the project site, ambient noise levels would be expected to be highest during the daytime and rush hour unless congestion slows speeds substantially. There are no existing noise sources within the Plan Area. Five 20-minute noise measurements were taken at the project site using an ANSI Type II integrating sound level meter in June These noise measurements provide existing on-site sound levels. Table 2 identifies the noise measurement locations and measured noise levels. Noise measurement data are shown in Appendix A of this report. Measurement Location Western boundary of project site near Pacific Heights Road Table 2 Noise Monitoring Results Sample Time (Approximate) Leq (dba) 2:15-2:35 P.M Northwestern boundary of project site 2:45 3:05 P.M Eastern boundary of project site near SR-70 Southern boundary of project site near mobile home park North eastern corner of project site near intersection of Ophir Road and SR-70 Source: Field visit using ANSI Type II Integrating sound level meter. See Appendix for noise monitoring data sheets 3:25 3:45 P.M :05 4:25 P.M :55 5:15 P.M Regulatory Setting Butte County s Noise Control Ordinance (Butte County Municipal Code Chapter 41A Noise Control) sets exterior (see Table 3) and interior (see Table 4) noise standards for noise sensitive areas. Table 3 Exterior Noise Standards Noise Level Descriptor Daytime (7 AM 7 PM) Evening (7 PM 10 PM) Night (10 PM 7 AM) Urban Non-Urban Urban Non-Urban Urban Non-Urban Hourly Average (Leq) Maximum (Lmax) Source: Butte County Municipal Code, Section 41A-7 Table 4 Interior Noise Standards Noise Level Descriptor Daytime (7 AM 7 PM) Evening (7 PM 10 PM) Night (10 PM 7 AM) Hourly Average (Leq) Maximum (Lmax) County of Butte

11 Rio d Oro Specific Plan Noise Impact Study Source: Butte County Municipal Code, Section 41A-8 Butte County exempts noise associated with construction activities within 1,000 feet of residential uses from the exterior and interior noise standards provided activities do not take place: from sunset to sunrise on weekdays and non-holidays; Fridays commencing at 6:00 PM through and including 8:00 AM on Saturday; Before 8:00 AM on holidays; Saturday commencing at 6:00 PM through and including 10:00 AM on Sunday; and, Sunday after 6:00 PM. The Butte County General Plan 2030 Health and Safety Element includes exterior and interior noise level standards for exposure to transportation noise sources. For residential areas, the maximum allowable exterior noise exposure is 60 dba (Ldn or CNEL) and the maximum allowable interior noise level standard is 45 dba (Ldn or CNEL). The Health and Safety Element also sets maximum allowable noise exposure to non-transportation sources which match the exterior noise standards in Table 3. The General Plan Health and Safety Element contains the following policies related to noise: HS-P1.1 HS-P1.2 HS-P1.3 HS-P1.4 HS-P1.5 HS-P1.6 HS-P1.7 HS-P1.8 HS-P1.9 New development projects proposed in areas that exceed the land use compatibility standards in Tables HS-2 and HS-3 shall require mitigation of noise impacts. Noise from transportation sources shall not exceed land use compatibility standards in Table HS-2. New noise-sensitive land uses shall not be located within the 55 Ldn contour of airports, roadways, and other noisegenerating uses, with the exception of the Chico Municipal Airport.* New noise-sensitive land uses shall not be located within the 60 Ldn contour of the Chico Municipal Airport.* Noise from new recreational activities and events shall not exceed 60 db at the nearest noise sensitive land use. Applicants proposing a new noise-producing development project near existing or planned noise-sensitive uses shall provide a noise analysis prepared by an acoustical specialist with recommendations for design mitigation. Applicants for discretionary permits shall be required to limit noise-generating construction activities located within 1,000 feet of residential uses to daytime hours between 7:00 a.m. and 6:00 p.m. on weekdays and non-holidays. Noise from generators shall be regulated near existing and future residential uses. The following standard construction noise control measures shall be required at construction sites in order to minimize construction noise impacts: 5 County of Butte

12 Rio d Oro Specific Plan Noise Impact Study a) Equip all internal combustion engine driven equipment with intake and exhaust mufflers that are in good condition and appropriate for the equipment. b) Locate stationary noise-generating equipment as far as possible from sensitive receptors when sensitive receptors adjoin or are near a construction project area. c) Utilize quiet air compressors and other stationary noise generating equipment where appropriate technology exists and is feasible. HS-P1.10 To reduce impacts from ground borne vibration associated with rail operations, residences or other vibration-sensitive buildings shall be sited at least 100 feet from the centerline of the nearest railroad track whenever feasible. Development of vibration-sensitive buildings, such as those containing precision medical and industrial equipment or television, radio and recording studios, within 100 feet from the centerline of the nearest railroad track shall require a study demonstrating that groundborne vibration issues associated with rail operations have been adequately addressed through building siting or construction techniques. IMPACT ANALYSIS Methodology and Significance Thresholds Construction noise estimates are based upon noise levels reported in the May 2006 Transit Noise and Vibration Impact Assessment created by the Federal Transit Administration (FTA). Reference noise levels from that document were then used to estimate noise levels at nearby sensitive receptors based on a standard noise attenuation rate of 6 dba per doubling of distance (line-ofsight method of sound attenuation). Construction noise level estimates do not account for the presence of intervening structures or topography, which could reduce noise levels at receptor locations. Therefore, the noise levels presented herein represent a conservative estimate of actual construction noise. Noise levels associated with existing and future traffic along area roadways were calculated using the Traffic Noise Model Version 2.5 (U.S. Department of Transportation, Federal Highway Administration [FHWA], April 2004) (noise modeling data sheets can be viewed in the Appendix). The model calculations are based on traffic data from the project traffic study. For traffic-related noise, impacts are considered significant if project-generated traffic results in exposure of sensitive receptors to an unacceptable increase in noise levels. Recommendations contained in the May 2006 Transit Noise and Vibration Impact Assessment created by the Federal Transit Administration (FTA) were used to determine whether increases in roadway noise would be significant. The allowable noise exposure increase changes with increasing noise exposure, such that lower ambient noise levels have a higher allowable noise exposure increase. Table 5 shows the significance thresholds for increases in traffic-related noise levels caused either by the project alone or by cumulative development. 6 County of Butte

13 Rio d Oro Specific Plan Noise Impact Study Table 5 Significance of Changes in Operational Roadway Noise Exposure Existing Noise Exposure Source: FTA, May 2006 Ldn or Leq in dba Allowable Noise Exposure Increase If sensitive receptors would be exposed to traffic noise increases exceeding the above criteria, impacts would be considered significant. Impacts related to on-site activities, such as noise from long-term project operation, would be considered significant if project activities would result in noise levels exceeding County standards shown in Tables 3 and 4. Construction Noise Project construction could intermittently generate high noise levels on and adjacent to the plan area. Temporary noise impacts associated with construction may adversely affect nearby residential uses. Buildout of the entire plan area is expected to occur over approximately 20 years with full buildout in The main sources of noise during construction activities would be the heavy machinery used in grading and clearing the site. Table 6 shows the typical noise levels associated with heavy construction equipment based on a standard noise attenuation rate of 6 dba per doubling of distance. As shown, average noise levels associated with the use of heavy equipment at construction sites can range from about 76 to 89 dba at 50 feet from the source, depending upon the types of equipment in operation at any given time and phase of construction (FTA, May 2006). Equipment Table 6 Typical Noise Levels at Construction Sites Typical Noise Level (dba) 50 Feet from the Source Typical Noise Level (dba) 100 Feet from the Source Typical Noise Level (dba) 150 feet from the source Air Compressor Backhoe Concrete Mixer Paver Saw Scraper Truck Source: FTA, May County of Butte

14 Rio d Oro Specific Plan Noise Impact Study Noise sensitive receptors near the plan area include the mobile home park just south of the plan area (between SR-70 and Pacific Heights Road) and the existing single-family homes just west of the plan area (between the plan area and Pacific Heights Road). Based on the proposed village concept map, the proposed project could involve grading and construction activities approximately 50 feet from the existing single family homes west of the plan area and approximately 250 feet from the existing mobile home park. In addition, as the Specific Plan is built out, construction activities would occur adjacent to developed residences on the plan area. Though the specific timing and phasing of construction within the Plan Area is not know at this time, this analysis conservatively assumes that construction could occur within 50 feet of sensitive receptors. As shown in Table 6, construction noise levels could be up to 89 dba at 50 feet from the source which would exceed the daytime exterior noise limits for non-urban areas shown in Table 2. As stated previously, Butte County exempts noise associated with construction activities located within 1,000 feet of residential uses from exterior and interior noise standards provided they do not take place during certain hours. Therefore, for construction activities during the exempt hours, impacts would be less than significant. Mitigation Measure N-1 is required to restrict construction activities during the time they are exempt from City noise standards. In addition mitigation measures N-2 and N-3 are recommended to reduce noise levels associated with construction activities. Mitigation Measures. Temporary construction impacts would be reduced through implementation of the following mitigation: N-1 Construction Timing. Construction activities should be prohibited: from sunset to sunrise on weekdays and non-holidays; Fridays commencing at 6:00 PM through and including 8:00 AM on Saturday; Before 8:00 AM on holidays; Saturday commencing at 6:00 PM through and including 10:00 AM on Sunday; and, Sunday after 6:00 PM. N-2 Construction Equipment. To the extent practical, electrical power should be used to run air compressors and similar power tools. Internal combustion engines should be equipped with a muffler of a type recommended by the manufacturer. No internal combustion engine should be operated on the project site without the manufacturer-recommended muffler. All diesel equipment should be operated with closed engine doors and should be equipped with factory-recommended mufflers. N-3 Additional Noise Reduction Techniques. Additional noise attenuation techniques should be employed as necessary to reduce noise levels to below applicable standards. Such 8 County of Butte

15 Rio d Oro Specific Plan Noise Impact Study techniques may include, but are not limited to, the use of sound blankets on noise generating equipment. Residual Impacts. Project construction would represent a temporary source of noise at the project site. Mitigation Measures N-1 would restrict the hours of construction so that construction would occur during hours where construction activities would be exempt from Butte County noise standards. Mitigation Measures N-2 and N-3 would reduce noise impacts to sensitive receptors near the Plan Area and residences on the Plan Area. Implementation of the noise reduction measures would reduce construction-related noise impacts to a less than significant level. Long-Term Operational Noise Exposure The proposed Specific Plan would involve construction of residential, commercial, public facility, park and open space, and environmental conservation uses within five villages on approximately 689 acres. Noise levels would increase as a result of on-going activities associated with Specific Plan development. Noise generated from loading docks, mechanical equipment (such as heating, ventilation and air conditioning (HVAC) units), deliveries, trash hauling activities, and parking lots could be expected from commercial and institutional development envisioned in the Specific Plan. Institutional uses would include an elementary school, which is generally not a significant noise generating land use. The school would include an open space Village Green, which would be adjacent to the existing residential uses to the west of the Specific Plan Area. The public facility uses would include a reclaimed water treatment and pump station and a public safety station capable of accommodating fire protection and law enforcement needs. Much of the noise generated by these activities would be intermittent and separated from noise sensitive receivers; and therefore, is unlikely to exceed County standards. Impacts would be less than significant. Long-Term Regional Impacts Development facilitated by the proposed Specific Plan would increase the number of vehicle trips to and from the site and within the general project area. This combined with cumulative growth would increase traffic noise on area roadways within the vicinity of the Specific Plan. Existing, noise levels with the project and cumulative noise levels were calculated using the FHWA TNM Version 2.0. Noise modeling was focused on the area generally between Palermo Road and Ophir Road and west along Pacific Heights Road. These areas are where sensitive receivers and traffic volumes associated with the project would be concentrated; and thus, are likely to create the greatest change in noise levels associated with the project. Noise calculations are based on traffic volumes provided in the Traffic Impact Study (KD Anderson & Associates, Inc., 2014). Related information on roadway geometrics, speeds and terrain elevation were incorporated into the model. Noise levels were estimated at twelve receiver points that represent existing sensitive properties as well as front line receivers within Villages 6, 8a and 8b developed adjacent to SR 70 between Palermo Road to the south and Ophir Road to the north. Noise levels were calculated for existing conditions, 2015 Phase I with project, 2035 Cumulative (No Project) and 2035 Cumulative plus Project. Table 5 shows modeled noise levels associated with each scenario. Modeling results are provided in Appendix B of this report. 9 County of Butte

16 Rio d Oro Specific Plan Noise Impact Study As shown, modeled noise levels are higher along the SR 70 corridor and in proximity to the Palermo Road/Ophir Road intersection where traffic volumes and speeds are higher and there s no intervening terrain to screen traffic noise. Noise levels along Pacific Heights Road are relatively low which in part reflects low traffic volumes and intervening terrain. The largest increase in noise levels associated with the project would be in proximity to the northern entrance where the greatest increase in traffic volumes are projected. The largest increase (3.4 dba) would occur at the receivers located adjacent to Pacific Heights Road north of Sun Cloud Drive. Noise levels without the project would be approximately 40 dba. Based on the criteria presented in Table 7, peak hour noise levels would have to increase by 7 dba to cause a significant noise impact. An increase of 3.4 dba would be audible; however, it would not meet the impact criteria. Thus, impacts related to traffic noise would be less than significant. Table 7 Short Term Future and Cumulative Traffic Noise Impacts on Existing Development Receiver Existing 2015 Phase I Dingerville Mobile Home Park Pacific Heights Rd. south of Sun Cloud Pacific Heights Rd/Sun Cloud Pacific Heights Rd north of Sun Cloud Pacific Heights Rd. Pacific Heights Drive Southeast of Palermo SR 70 Southwest of Palermo Road at SR 70 Southeast of Ophir Road at SR 70 Village SR 70 Village SR 70 Village SR 70 Source:TNM Output Files (Appendix G) 2035 No Project 2035 Cumulative Plus Project dba Change Significant Impact No No No No No No No No No No No No 10 County of Butte

17 Rio d Oro Specific Plan Noise Impact Study Development facilitated by the proposed Specific Plan would add internal vehicle trips associated with residences, vendors, commercial vehicles and so forth. The trips would generate noise on roadways within the Specific Plan area. Future development in the Specific Plan area includes residential, school, recreational, commercial, and public facility uses which are considered sensitive receptors by the Butte County General Plan. As shown, future sensitive receptors in the Specific Plan area would be located adjacent to planned roadway segments; and therefore, would be exposed to vehicle noise. As discussed, modeling indicates that noise levels associated with traffic on roadways adjacent to the project would not cause a significant or adverse noise impact. As shown in Tables 3 and 4, Butte County has an exterior noise standard of 55 dba Leq and an interior standard of 45 dba Leq during the daytime. Proposed sensitive receptors within the Specific Plan Area may be located adjacent to areas with high traffic-related exterior noise levels such that interior noise levels would exceed County Standards. Though a general circulation plan is proposed, the precise location of future sensitive receptors under the Specific Plan relative to future roadway centerlines is not known at this time. Depending on the proximity of receptors to roadway segments and on the type of building material used, interior noise levels in future receptors within the Specific Plan Area may exceed County standards. The exterior-tointerior noise attenuation of standard building materials used for residential development can be up to 30 dba (HMMH, 2006). However, the level of noise attenuation provided by the building materials used in these proposed sensitive receptors is not known at this time. Thus, it is possible that these receptors could be exposed to interior noise levels that exceed 45 dba. Therefore, impacts would be potentially significant. Mitigation Measures. The following mitigation measure shall apply to future development in the Specific Plan in areas where exterior noise levels exceed County standards. N-5 Acoustical Analysis and Design Mitigation. Butte County Development Services shall determine during review of each development phase, whether supplemental project specific noise analyses are warranted shall require the incorporation of noise reduction measures into the project design to assure that exterior and interior noise level standards of the County are achieved. Noise reduction measures may include (but would not be limited to): Sound barriers, including sound walls. To avoid secondary aesthetic impacts, long expanses of walls or fences shall be interrupted with offsets and provided with accents to prevent monotony. Landscape pockets and pedestrian access through walls should be provided. Whenever possible, a combination of elements shall be used, including solid fences, walls, and, landscaped berms; Site layout, including setbacks, open space separation and shielding of noise sensitive uses with non-noise-sensitive uses; Roof and attic vents facing away from the nearest roadway; Air conditioning or a mechanical ventilation system that will allow doors and windows to remain closed; 11 County of Butte

18 Rio d Oro Specific Plan Noise Impact Study Double-paned glass on all windows; Windows and sliding glass doors mounted in low air infiltration rate frames; Solid core exterior doors with perimeter weather stripping and threshold seals; and Acoustically insulated building wall construction. Significance After Mitigation. Implementation of Mitigation Measure N-5 if applicable is expected to achieve an interior noise level reduction of 30 dba or greater as well as attenuate exterior noise levels to acceptable levels and would assure that sensitive receptors are not exposed to interior noise levels in excess of County standards. Impacts would be reduced to a less than significant level with mitigation implemented. 12 County of Butte

19 Rio d Oro Specific Plan Noise Impact Study REFERENCES Butte County. General Plan 2030 Health and Safety Element. Butte County. Municipal Code. Federal Transit Administration, Office of Planning and Environment. May Transit Noise and Vibration Impact Assessment. Prepared by Hanson, Carl E., Towers, David A., and Meister, Lance D. KD Anderson & Associates, Inc.. March Traffic Impact Analysis, Rio d Oro Specific Plan. U.S. Department of Transportation, Federal Highway Administration. Traffic Noise Model version 2.5. April County of Butte

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21 Appendix A Noise Measurements

22 C:\LARDAV\LOMITA.bin Interval Data Peak Uwpk Meas Excd Excd Over Site Location Number Date Time Duration Leq SEL Lmax Lmin Peak Uwpk L(10) L(33) L(50) L(90) Count Count loads " " " " " " " " " " " " " " " " " " Jun 13 14:16: Jun 13 14:44: Jun 13 15:26: Jun 13 16:05: Jun 13 16:54:

23 C:\LARDAV\LOMITA.bin Event Data Peak Meas Time of Excd Over Site Location Number Date Time Lmax Duration Leq SEL Lmax Peak Uwpk Sym Decay Type Count loads " " " " " " " " " " " " " " " " Jun 13 15:26:45 15:26: Jun 13 15:28:36 15:28: Jun 13 15:29:05 15:29: Jun 13 15:29:31 15:29: Jun 13 15:30:24 15:30: Jun 13 15:30:55 15:31: Jun 13 15:31:39 15:31: Jun 13 15:32:17 15:32: Jun 13 15:32:52 15:32: Jun 13 15:33:08 15:33: Jun 13 15:33:57 15:34: Jun 13 15:34:42 15:35: Jun 13 15:35:28 15:35: Jun 13 15:36:07 15:36: Jun 13 15:36:42 15:36: Jun 13 15:37:00 15:37: Jun 13 15:37:23 15:37: Jun 13 15:37:42 15:37: Jun 13 15:38:19 15:38: Jun 13 15:43:36 15:43: Jun 13 15:43:59 15:44: Jun 13 15:44:06 15:44: Jun 13 15:46:08 15:46: Jun 13 16:56:04 16:56: Jun 13 16:58:45 16:58: Jun 13 17:11:51 17:11: Jun 13 17:14:53 17:14:

24 C:\LARDAV\LOMITA.bin Run/Stop Data Meas Site Location Number Date Time Type Cause " " " " " " Jun 13 14:16:25 Run Key Jun 13 14:36:25 Stop Intv Jun 13 14:44:24 Run Key Jun 13 15:04:24 Stop Intv Jun 13 15:26:32 Run Key Jun 13 15:46:32 Stop Intv Jun 13 16:05:50 Run Key Jun 13 16:25:50 Stop Intv Jun 13 16:54:54 Run Key Jun 13 17:14:54 Stop Intv

25 C:\LARDAV\LOMITA.bin Time History Data Sample Period (sec): Meas Site Location Number Date Time Level Lmax SEL " " " " " " " Run Key Jun 13 14:16: Jun 13 14:16: Jun 13 14:16: Jun 13 14:16: Jun 13 14:17: Jun 13 14:17: Jun 13 14:17: Jun 13 14:17: Jun 13 14:17: Jun 13 14:17: Jun 13 14:18: Jun 13 14:18: Jun 13 14:18: Jun 13 14:18: Jun 13 14:18: Jun 13 14:18: Jun 13 14:19: Jun 13 14:19: Jun 13 14:19: Jun 13 14:19: Jun 13 14:19: Jun 13 14:19: Jun 13 14:20: Jun 13 14:20: Jun 13 14:20: Jun 13 14:20: Jun 13 14:20: Jun 13 14:20: Jun 13 14:21: Jun 13 14:21: Jun 13 14:21: Jun 13 14:21: Jun 13 14:21: Jun 13 14:21: Jun 13 14:22: Jun 13 14:22: Jun 13 14:22: Jun 13 14:22: Jun 13 14:22: Jun 13 14:22:

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27 Stop Run Jun 13 14:30: Jun 13 14:31: Jun 13 14:31: Jun 13 14:31: Jun 13 14:31: Jun 13 14:31: Jun 13 14:31: Jun 13 14:32: Jun 13 14:32: Jun 13 14:32: Jun 13 14:32: Jun 13 14:32: Jun 13 14:32: Jun 13 14:33: Jun 13 14:33: Jun 13 14:33: Jun 13 14:33: Jun 13 14:33: Jun 13 14:33: Jun 13 14:34: Jun 13 14:34: Jun 13 14:34: Jun 13 14:34: Jun 13 14:34: Jun 13 14:34: Jun 13 14:35: Jun 13 14:35: Jun 13 14:35: Jun 13 14:35: Jun 13 14:35: Jun 13 14:35: Jun 13 14:36: Jun 13 14:36: Jun 13 14:36: Intv Key Jun 13 14:44: Jun 13 14:44: Jun 13 14:44: Jun 13 14:44: Jun 13 14:45: Jun 13 14:45: Jun 13 14:45: Jun 13 14:45: Jun 13 14:45: Jun 13 14:45: Jun 13 14:46:

28 0 0 10Jun 13 14:46: Jun 13 14:46: Jun 13 14:46: Jun 13 14:46: Jun 13 14:46: Jun 13 14:47: Jun 13 14:47: Jun 13 14:47: Jun 13 14:47: Jun 13 14:47: Jun 13 14:47: Jun 13 14:48: Jun 13 14:48: Jun 13 14:48: Jun 13 14:48: Jun 13 14:48: Jun 13 14:48: Jun 13 14:49: Jun 13 14:49: Jun 13 14:49: Jun 13 14:49: Jun 13 14:49: Jun 13 14:49: Jun 13 14:50: Jun 13 14:50: Jun 13 14:50: Jun 13 14:50: Jun 13 14:50: Jun 13 14:50: Jun 13 14:51: Jun 13 14:51: Jun 13 14:51: Jun 13 14:51: Jun 13 14:51: Jun 13 14:51: Jun 13 14:52: Jun 13 14:52: Jun 13 14:52: Jun 13 14:52: Jun 13 14:52: Jun 13 14:52: Jun 13 14:53: Jun 13 14:53: Jun 13 14:53: Jun 13 14:53: Jun 13 14:53: Jun 13 14:53:

29 0 0 10Jun 13 14:54: Jun 13 14:54: Jun 13 14:54: Jun 13 14:54: Jun 13 14:54: Jun 13 14:54: Jun 13 14:55: Jun 13 14:55: Jun 13 14:55: Jun 13 14:55: Jun 13 14:55: Jun 13 14:55: Jun 13 14:56: Jun 13 14:56: Jun 13 14:56: Jun 13 14:56: Jun 13 14:56: Jun 13 14:56: Jun 13 14:57: Jun 13 14:57: Jun 13 14:57: Jun 13 14:57: Jun 13 14:57: Jun 13 14:57: Jun 13 14:58: Jun 13 14:58: Jun 13 14:58: Jun 13 14:58: Jun 13 14:58: Jun 13 14:58: Jun 13 14:59: Jun 13 14:59: Jun 13 14:59: Jun 13 14:59: Jun 13 14:59: Jun 13 14:59: Jun 13 15:00: Jun 13 15:00: Jun 13 15:00: Jun 13 15:00: Jun 13 15:00: Jun 13 15:00: Jun 13 15:01: Jun 13 15:01: Jun 13 15:01: Jun 13 15:01: Jun 13 15:01:

30 Stop Run Jun 13 15:01: Jun 13 15:02: Jun 13 15:02: Jun 13 15:02: Jun 13 15:02: Jun 13 15:02: Jun 13 15:02: Jun 13 15:03: Jun 13 15:03: Jun 13 15:03: Jun 13 15:03: Jun 13 15:03: Jun 13 15:03: Jun 13 15:04: Jun 13 15:04: Jun 13 15:04: Intv Key Jun 13 15:26: Jun 13 15:26: Jun 13 15:26: Jun 13 15:27: Jun 13 15:27: Jun 13 15:27: Jun 13 15:27: Jun 13 15:27: Jun 13 15:27: Jun 13 15:28: Jun 13 15:28: Jun 13 15:28: Jun 13 15:28: Jun 13 15:28: Jun 13 15:28: Jun 13 15:29: Jun 13 15:29: Jun 13 15:29: Jun 13 15:29: Jun 13 15:29: Jun 13 15:29: Jun 13 15:30: Jun 13 15:30: Jun 13 15:30: Jun 13 15:30: Jun 13 15:30: Jun 13 15:30: Jun 13 15:31: Jun 13 15:31:

31 0 0 10Jun 13 15:31: Jun 13 15:31: Jun 13 15:31: Jun 13 15:31: Jun 13 15:32: Jun 13 15:32: Jun 13 15:32: Jun 13 15:32: Jun 13 15:32: Jun 13 15:32: Jun 13 15:33: Jun 13 15:33: Jun 13 15:33: Jun 13 15:33: Jun 13 15:33: Jun 13 15:33: Jun 13 15:34: Jun 13 15:34: Jun 13 15:34: Jun 13 15:34: Jun 13 15:34: Jun 13 15:34: Jun 13 15:35: Jun 13 15:35: Jun 13 15:35: Jun 13 15:35: Jun 13 15:35: Jun 13 15:35: Jun 13 15:36: Jun 13 15:36: Jun 13 15:36: Jun 13 15:36: Jun 13 15:36: Jun 13 15:36: Jun 13 15:37: Jun 13 15:37: Jun 13 15:37: Jun 13 15:37: Jun 13 15:37: Jun 13 15:37: Jun 13 15:38: Jun 13 15:38: Jun 13 15:38: Jun 13 15:38: Jun 13 15:38: Jun 13 15:38: Jun 13 15:39:

32 Stop Run Jun 13 15:39: Jun 13 15:39: Jun 13 15:39: Jun 13 15:39: Jun 13 15:39: Jun 13 15:40: Jun 13 15:40: Jun 13 15:40: Jun 13 15:40: Jun 13 15:40: Jun 13 15:40: Jun 13 15:41: Jun 13 15:41: Jun 13 15:41: Jun 13 15:41: Jun 13 15:41: Jun 13 15:41: Jun 13 15:42: Jun 13 15:42: Jun 13 15:42: Jun 13 15:42: Jun 13 15:42: Jun 13 15:42: Jun 13 15:43: Jun 13 15:43: Jun 13 15:43: Jun 13 15:43: Jun 13 15:43: Jun 13 15:43: Jun 13 15:44: Jun 13 15:44: Jun 13 15:44: Jun 13 15:44: Jun 13 15:44: Jun 13 15:44: Jun 13 15:45: Jun 13 15:45: Jun 13 15:45: Jun 13 15:45: Jun 13 15:45: Jun 13 15:45: Jun 13 15:46: Jun 13 15:46: Jun 13 15:46: Jun 13 15:46: Intv Key

33 0 0 10Jun 13 16:05: Jun 13 16:06: Jun 13 16:06: Jun 13 16:06: Jun 13 16:06: Jun 13 16:06: Jun 13 16:06: Jun 13 16:07: Jun 13 16:07: Jun 13 16:07: Jun 13 16:07: Jun 13 16:07: Jun 13 16:07: Jun 13 16:08: Jun 13 16:08: Jun 13 16:08: Jun 13 16:08: Jun 13 16:08: Jun 13 16:08: Jun 13 16:09: Jun 13 16:09: Jun 13 16:09: Jun 13 16:09: Jun 13 16:09: Jun 13 16:09: Jun 13 16:10: Jun 13 16:10: Jun 13 16:10: Jun 13 16:10: Jun 13 16:10: Jun 13 16:10: Jun 13 16:11: Jun 13 16:11: Jun 13 16:11: Jun 13 16:11: Jun 13 16:11: Jun 13 16:11: Jun 13 16:12: Jun 13 16:12: Jun 13 16:12: Jun 13 16:12: Jun 13 16:12: Jun 13 16:12: Jun 13 16:13: Jun 13 16:13: Jun 13 16:13: Jun 13 16:13: