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Home My WebLink About1.13 Noise AnalysisArticle 7 Standards Attached is the Noise Analysis completed by Hankard Environmental showing that all noise is in compliance with the county standards. 7.6,o 3 /d;&e, 5d c H`l. Fi N oRONMENTAL November 4, 2016 Ms. Cori Rider Owner Cozy Little Kennel 500 County Road 259 Rifle, CO 81650 Re: Noise Analysis for Cozy Little Kennel in Rifle, Colorado Dear Ms. Rider, This report describes the results of a noise analysis conducted for the Cozy Little Kennel located in Rifle, Colorado. It is our understanding that this kennel is subject to the noise limitations imposed by Garfield County land use standards. Our analysis consisted of a review of applicable noise regulations, noise level predictions, and an assessment of compliance with regulations and standards. NOISE REGULATIONS Garfield County Land Use Standards, Section 7-603, Kennels says that no noise shall emanate from the property boundary in excess of the Residential Zone as defined by Colorado Revised Statutes (CRS) §25-12-103. This code limits the amount of sound that a source located on one property can emit onto another property when measured 25 feet inside the receiving property. Table 1 provides the sound limitations as categorized by the receiving property land use and time of day. One exception includes an allowance for the sound level to be increased by 10 dBA for a period of no longer than 15 minutes in any one hour between the hours of 7am and 7pm. TABLE 1 CRS 25-12-103 SOUND LIMITATIONS (dBA) Zone Daytime (1), (2) Nighttime (2) (7:OOam to 7:O0pm) (7:OOpm to 7:OOam) Residential 55 50 Commercial 60 55 Light Industrial 70 65 Industrial 80 75 (1) Daytime noise levels can be increased by 10 dBA for 15 minutes in any one-hour period Noise level limit decreased by 5 dBA for impulsive type sounds. COLORADO • WISCONSIN phone (303) 666-0617 • www.hankardinc.com • fax (303) 600-0282 HANKARI3 ENVIRONMENTAL Ei N V I RONMFNTAL It is our understanding that the dogs are let outside five times a day for thirty to sixty minutes each day at 7:00am, 10:30am, 2:OOpm, 5:OOpm, and 9:OOpm. Four of the outdoor times are during the daytime (7:OOam to 7:OOpm) which has a limit of 55 dBA, with an allowable increase in the limit of 10 dBA for 15 minutes in any one-hour period. The one of the outdoor time at 9:OOpm is during the nighttime (7:OOpm to 7:OOam), which has a 50 dBA limit. Additionally, there is the enclosed kennel where the dogs are kept overnight and the limit on noise emanating from this facility would also be 50 dBA. NOISE LEVEL PREDICTIONS To predict the noise levels from the barking dogs 25 feet outside the Cozy Little Kennel property, the noise source, the location of the noise source, and the property outline were defined. Figure 1 shows the location of the property line, 25 feet outside the property line, the location of the kennel, and the location of the fenced dog play area. The noise source of concern is barking dogs. A review of a published report by an acoustical consulting firm for the Happy Trails Bed and Biscuit m California (2008) included four continuous days of noise measurements 75 feet from the kennel which contained 14 to 15 dogs. During these four days, the dogs were let outside 17 times in which the maximum noise level (Lmax) was 60 to 65 dBA. For this analysis we used 65 dBA with a directivity factor of 2 (hemispherical) to result in a sound power level of 100 dBA, which is felt to be appropriate to predict noise levels from the Cozy Little Kennel. Noise levels were predicted using SoundPLAN v7.4 software and the ISO 9613 algorithm, which is common and appropriate for these outdoor sound predictions. The source was considered a point source about 3 feet off the ground. The compliance location was considered a person at 5 feet off the ground. The ground cover was assumed to be grass which corresponds to a 0.5 ground factor (0.0 is completely absorptive and 1.0 is completely reflective). The two locations from which dogs might bark are the dog play area (outdoor) and the kennel (indoor). The distances from the source to where the noise levels reached 50 dBA (nighttime limit) was calculated to be 240 feet, and for the 65 dBA limit (daytime limit of 55 dBA plus 10 dBA for 15 minutes in any one-hour) was found to be 50 feet. The kennel (indoor) is used both daytime and nighttime, and thus the 50 dBA nighttime limit is applicable. A common rule of thumb for a wood framed building with windows closed is to apply 20 dB of noise reduction. When doing so, the 50 dBA limit is reached at a distance of 25 feet from the kennel. Noise Analysis for Cozy Little Kennel in Rifle, Colorado page 2 November 4, 2016 HANKARD EN VIRON MENTAL Figure 1— Cozy Little Kennel Layout Noise Analysis for Cozy Little Kennel in Rifle, Colorado November 4, 2016 page 3 HANKAR0 EN V C RONM ENTAL COMPLIANCE ASSESSMENT Barking dogs outside of the kennel should remain 25 feet or more from the property line during the daytime hours. During the nighttime, barking dogs should remain 200 feet or more from the property line. With regard to barking dogs inside the kennel, we estimate that the nighttime noise level limit of 50 dBA was reached at a distance of 25 feet from the kennel. The kennel is located 50 feet from the nearest property line and 75 feet from the nearest compliance point. Thus, noise from dogs barking inside the kennel at night is expected to be in compliance with Garfield County land use standards. Please call if you have any questions. Sincerely, Jeff M. Cerjan Senior Acoustical Consultant Member — Institute of Noise Control Engineering Cc: Michael Hankard, Hankard Environmental Noise Analysis for Cozy Little Kennel in Rifle, Colorado page 4 November 4, 2016