Saticoy & Wells Community Plan & Development ... - City Of Ventura

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Saticoy & Wells Community Plan and Code EIRSection 4.11 Noise4.11 NOISEThis section addresses the impacts of noise generated by additional traffic and the placement ofdevelopment near noise producing sources.4.11.1 Settinga. Overview of Sound Measurement. Noise level (or volume) is generally measured indecibels (dB) using the A-weighted sound pressure level (dBA). The A-weighting scale is anadjustment to the actual sound power levels to be consistent with that of human hearingresponse, which is most sensitive to frequencies around 4,000 Hertz (about the highest note on apiano) and less sensitive to low frequencies (below 100 Hertz).The sound pressure level is measured on a logarithmic scale with the 0 dB level based on thelowest detectable sound pressure level that people can perceive (an audible sound that is notzero sound pressure level). Based on the logarithmic scale, a doubling of sound energy isequivalent to an increase of 3 dB, and a sound that is 10 dB less than the ambient sound levelhas no effect on ambient noise. Because of the nature of the human ear, a sound must be about10 dB greater than the reference sound to be judged as twice as loud. In general, a 3 dB changein 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 40-50 dBA, while those alongarterial streets are in the 50-60+ dBA range. Normal conversational levels are in the 60-65 dBArange, 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 frompoint sources such as industrial machinery. Noise from lightly traveled roads typicallyattenuates at a rate of about 4.5 dB per doubling of distance. Noise from heavily traveled roadstypically attenuates at about 3 dB per doubling of distance.In addition to the actual instantaneous measurement of sound levels, the duration of sound isimportant since sounds that occur over a long period of time are more likely to be an annoyanceor cause direct physical damage or environmental stress. One of the most frequently used noisemetrics 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 amountof energy as that contained in the actual fluctuating levels over a period of time (essentially, theaverage noise level). Typically, Leq is summed over a one-hour period.The actual time period in which noise occurs is also important since noise that occurs at nighttends to be more disturbing than that which occurs during the daytime. Two commonly usednoise metrics – the Day-Night average level (Ldn) and the Community Noise Equivalent Level(CNEL) - recognize this fact by weighting hourly Leqs over a 24-hour period. The Ldn is a 24-hour average noise level that adds 10 dB to actual nighttime (10 PM to 7 AM) noise levels toaccount for the greater sensitivity to noise during that time period. The CNEL is identical to theLdn, except it also adds a 5 dB penalty for noise occurring during the evening (7 PM to 10 PM).b. Sensitive Receptors. Noise exposure goals for various types of land uses reflect thevarying noise sensitivities associated with those uses. Residences, hospitals, schools, guest4.11-1City of Ventura
Saticoy & Wells Community Plan and Code EIRSection 4.11 Noiselodging, and libraries are most sensitive to noise intrusion and therefore have more stringentnoise exposure targets than manufacturing or agricultural uses that are not subject to impactssuch as sleep disturbance. The Project Area and surrounding neighborhoods include numerousresidential areas. Other sensitive receptors in the area include Sacred Heart School, SaticoyElementary School, Douglas Penfield School, seniors living at assisted living communities, andpatients of medical offices. The schools are primarily located in the West Neighborhood on theblock of land between the SR 126 and the Saticoy Golf Course. One additional school is locatedin the Northeast Neighborhood adjacent to Wells Road. Seniors living in assisted livingcommunities would occur in the Southwest Neighborhood as part of the Veteran’s HomeProject; while patients of medical offices would be located along Wells Road between thenorthern Project Area boundary and SR 126.c. Noise Sources. Noise sources often include roadways, construction sites, industrialuses, etc. The primary noise sources in most of the Project Area are roadways such as SR 126,Telegraph Road, Telephone Road and Wells Road. Existing noise levels within the Project Areaare identified in Table 4.11-1 as taken from the Parklands and General Plan EIRs.Table 4.11-1Existing Noise Levels in the Vicinity of the Project AreaLocationNoiseLevel(dBA Leq)Near Bonaventure Senior Housing at Telegraph Road a 67.0Near Las Clinicas Medical Building at Wells Road a 76.1Near Country Estates Mobile Home Park at Blackburn Road a 74.2Telegraph Road/Nevada – 35 ft from Telegraph centerline b 69.7aData taken from Parklands DEIR, 2008.bData taken from City of Ventura General Plan EIR, 2005.Additional noise sources occur within the Southwestern and Southeastern Neighborhoods ofthe Project Area, where industrial land uses occur. Industrial areas are located primarily alongWells Road and include uses such as auto repair, recycling centers, industrial equipment repairand the County of Ventura Public Works yard. These noise sources have the potential to affectadjacent residential dwellings located in Old Town Saticoy and near the Veteran’s Home.d. Regulatory Setting. Guidelines for noise compatible land use, based upon the Cityof Ventura General Plan “Our Healthy and Safe Community” Element noise guidelines areshown on Figure 4.11-1. The objective of noise compatibility guidelines is to provide thecommunity with a means of judging the noise environment that it deems to be generallyacceptable.4.11-2City of Ventura
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