Volume 2: Draft Gorst Planned Action Environmental Impact Statement

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GORST PLANNED ACTION EIS | AFFECTED ENVIRONMENT, SIGNIFICANT IMPACTS, AND MITIGATION MEASURESCommon Outdoor ActivitiesGas Lawn Mower at 30 meters (100 feet)Commercial Area Heavy Traffic at 90 meters(300 feet)Noise Level(dBA)Common Indoor Activities--60-- Normal Speech at 1 meter (3 feet)Quiet Urban Daytime --50-- Large Business Office Dishwasher in Next RoomQuiet Urban Nighttime --40-- Theater, Large Conference Room (Background)Quiet Suburban Nighttime --30-- LibraryQuiet Rural Nighttime --20-- Bedroom at Night, Concert Hall (Background)--10-- Broadcast/Recording StudioLowest Threshold of Human Hearing --0-- Lowest Threshold of Human HearingSource: Caltrans 2009Human perception of noise has no simple correlation with acoustical energy. The perception of noise is not linearin terms of dBA or in terms of acoustical energy. Two noise sources do not “sound twice as loud” as one source. Itis widely accepted that the average healthy ear can barely perceive changes of three dBA, increase or decrease;that a change of five dBA is readily perceptible; and that an increase (decrease) of 10 dBA sounds twice (half) asloud.Noise PropagationFrom the source to the receiver, noise changes both in level and frequency spectrum. The most obvious is thedecrease in noise as the distance from the source increases. The manner in which noise reduces with distancedepends on the important factors described in the following discussion.Geometric spreading from point and line sources: Sound from a small localized source (approximating a “point”source) radiates uniformly outward as it travels away from the source in a spherical pattern. The sound levelattenuates or drops off at a rate of six dBA for each doubling of the distance. The movement of the vehicles makesthe source of the sound appear to emanate from a line (line source) rather than a point when viewed over sometime interval. The sound level attenuates or drops off at a rate of three dBA per doubling of distance for linesources (Crocker et al. 2007).Ground absorption: Hard sites (i.e., sites with a reflective surface between the source and the receiver, such asparking lots or smooth bodies of water) receive no excess ground attenuation, and the changes in noise levels withdistance (drop-off rate) are simply the geometric spreading of the source. Soft sites are sites that have anabsorptive ground surface such as soft dirt, grass, or scattered bushes and trees and receive an excess groundattenuation value of 1.5 dBA per doubling of distance (Crocker et al. 2007).Atmospheric effects: Wind speed will bend the path of sound to “focus” it on the downwind side and make a“shadow” on the upwind side of the source. At short distances, up to 164 feet, the wind has minor influence on themeasured sound level. For longer distances, the wind effect becomes appreciably greater. Temperature gradientscreate effects similar to those of wind gradients, except that they are uniform in all directions from the source. Ona sunny day with no wind, temperature decreases with altitude, giving a shadow effect for sound. On a clear night,temperature may increase with altitude, focusing sound on the ground surface (Caltrans 2009).Shielding by natural and man-made features, noise barriers, diffraction, and reflection: A large object in the pathbetween a noise source and a receiver can significantly attenuate noise levels at that receiver location. Theamount of attenuation provided by this “shielding” depends on the size of the object and the frequencies of thenoise levels. Natural terrain features such as hills and dense woods, as well as fabricated features such as buildingsand walls, can significantly alter noise levels.Draft | June 2013 3-72
GORST PLANNED ACTION EIS | AFFECTED ENVIRONMENT, SIGNIFICANT IMPACTS, AND MITIGATION MEASURESNoise DescriptorsThe intensity of environmental noise fluctuates over time, and several different descriptors of time-averaged noiselevels are used. The selection of a proper noise descriptor for a specific source depends on the spatial andtemporal distribution, duration, and fluctuation of both the noise source and the environment. The noisedescriptors used in this report to describe environmental noise are defined below.• L max (Maximum Noise Level): The highest A-weighted integrated noise level occurring during a specific periodof time.• L min (Minimum Noise Level): The lowest A-weighted integrated noise level during a specific period of time.• Peak: The highest weighted or unweighted instantaneous peak-to-peak value occurring during a measurementperiod.• L n (Statistical Descriptor): The noise level exceeded n percent of a specific period of time, generally acceptedas an hourly statistic. An L 10 would be the noise level exceeded 10 percent of the measurement period.• L eq (Equivalent Noise Level): The energy mean (average) noise level. The steady-state sound level that, in aspecified period of time, contains the same acoustical energy as a varying sound level over the same timeperiod.• L dn (Day-Night Noise Level): The 24-hour L eq with a 10-dBA “penalty” applied during nighttime noise-sensitivehours, 10:00 p.m. through 7:00 a.m. The L dn attempts to account for the fact that noise during this specificperiod of time is a potential source of disturbance with respect to normal sleeping hours.AMBIENT NOISE ENVIRONMENTThe ambient noise environment includes noise sensitive receivers, noise sources, and noise levels within the studyarea. Unincorporated portions of the watershed are under the jurisdiction of Kitsap County. KCC Chapter 10.28(Noise) establishes noise levels and durations of noise crossing property boundaries within unincorporated KitsapCounty. The majority of the watershed is currently under the jurisdiction of the City of Bremerton. In addition, theGorst UGA is likely to be under the jurisdiction of the City of Bremerton as a result of annexation in the time periodcovered by this Draft EIS. BMC Chapter 6.32 (Noise Levels) establishes limits on noise levels and durations of noisecrossing property boundaries within the City of Bremerton. Kitsap County and City of Bremerton noise regulationsare detailed below under Mitigation Measures, Applicable Regulations and Commitments.Noise sensitive receivers are generally considered humans engaged in activities or utilizing land uses that may besubject to the stress of significant interference from noise. Activities usually associated with sensitive receptorsinclude, but are not limited to, talking, reading, and sleeping. Land uses often associated with sensitive receptorsinclude residential dwellings, mobile homes, hotels, motels, hospitals, nursing homes, education facilities, libraries,and churches. Parks and open space are also sometimes considered to be noise sensitive land uses. Generally,outdoor areas of frequent human use are considered to be noise sensitive. Industrial and commercial land uses aregenerally not considered sensitive to noise.WatershedNoise sensitive receivers in the watershed include single-family residences, mobile homes, an RV park, churches,the Sunnyslope Elementary School, the Gold Mountain Golf Course, and the Rodeo Drive-In Theater. Sensitivereceivers outside of the UGA are likely affected the most by vehicular traffic on SR 3, West Belfair Valley Road,Sunnyslope Road Southwest, and on local roads. Aircraft overflights from the Bremerton National Airport are alikely intermittent noise source throughout the watershed; noise associated with aircraft take-off and landingslikely contribute to the ambient noise environment in the vicinity of the mobile home park and drive-in near theeast end of the Bremerton National Airport runway. Although no sound-level measurements were taken as part ofthis evaluation, typical ambient outdoor daytime sound levels are expected to range from as low as 35 to 40 dBA inDraft | June 2013 3-73
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KITSAP COUNTYCITY OF BREMERTONHED P
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VOLUME 2: GORST PLANNED ACTIONENVIR
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FACT SHEETProject TitleGorst Creek
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GORST PLANNED ACTION EIS | FACT SHE
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TABLE OF CONTENTSFact Sheet .......
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GORST PLANNED ACTION EIS | TABLE OF
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1.0 SUMMARY1.1 Purpose of Proposed
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GORST PLANNED ACTION EIS | SUMMARY
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2.0 ALTERNATIVES2.1 IntroductionThe
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FIGURE 2-1 GORST CREEK WATERSHED AE
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FIGURE 2-2 GORST URBAN GROWTH AREAW
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GORST PLANNED ACTION EIS | ALTERNAT
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FIGURE 2-3 GORST WATERSHED PLANNING
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FIGURE 2-4 GORST UGA LAND USE: ALTE
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FIGURE 2-10 GORST WATERSHED ASSESSM
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FIGURE 2-11 GORST CREEK WATERSHED:
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FIGURE 2-12 GORST WATERSHED PLANNIN
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FIGURE 2-13 PROPOSED FISH PASSAGE B
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GORST PLANNED ACTION EIS | AFFECTED
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Lake UnionReservoirQgdQaQgoQgoBreme
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City UtilityLandsBremerton West UGA
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GorstCreek.Jarstad CreekBremerton W
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FIGURE 3.2-3 GORST: IDENTIFIED EXIS
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Lake UnionReservoirBremertonHeinsCr
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FIGURE 3.12-1 GORST WATERSHED PLANN
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FIGURE 3.12-2 GORST CREEK WATERSHED
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Bremerton West UGAGorst UGAPump Sta
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FIGURE 3.14-1 GORST: COMPARISON OF
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4.0 REFERENCES4.1 Personal Communic
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GORST PLANNED ACTION EIS | REFERENC
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5.0 DISTRIBUTION LISTThe following
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GORST PLANNED ACTION EIS | APPENDIC
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GORST CREEK WATERSHED PLAN, GORST S
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Date Name/Agency Summarysharedpatht
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Exhibit 2. SWOT AnalysisStrengths -
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IhaverentalpropertiesthatarezonedHT
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ATTACHMENTSA. Scoping Advertisement
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What is an Environmental Impact Sta
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ORDINANCE NO.________AN ORDINANCE O
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PLANNED ACTION ORDINANCEfor the pla
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PLANNED ACTION ORDINANCE(4) Element
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PLANNED ACTION ORDINANCESection 5.
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PLANNED ACTION ORDINANCEEXHIBIT BPL
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Volume 2: Draft Gorst Planned Action Environmental Impact Statement

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