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Home My WebLink About1.13 Noise StudyHAN EN V IRON MENTAL —411C_i .;- -. .— ACo*uiuet •iip V[ORArigrt Chl I.rni4 August 23, 2017 Richard Hallett Red Barn Guest Ranch 345 County Road 262 Silt, Colorado 81652 Re: Noise Study Results for the Red Barn Guest Ranch in Silt, Colorado Dear Mr. Hallett, Hankard Environmental conducted a noise study for the Red Barn Guest Ranch to assess the noise levels at the property line from music played on the outdoor patio and in the indoor barn areas. It is our understanding that the noise levels from the music are subject to Garfield County's Land Use Resolution Code, Article 7-301 B.2 which references the Colorado Revised Statutes (CRS) §25-12. This letter describes the Red Barn Guest Ranch as it relates to the production of noise (music), the applicable noise regulations, the noise study method, the noise measurement results, and our conclusions. PROJECT DESCRIPTION The Red Barn Guest Ranch (RBGR) is located at 345 County Road 262 in Silt, Colorado, approximately 0.3 miles north of Interstate 70. The nearly 21 -acre site is surrounded by a mixture of agricultural and residential land uses. Two locations within the RBGR were identified as places where live or amplified music will occur. As shown in Figure 1, these include the outdoor patio area and inside the red barn on the second floor. Music will be played at the RBGR during both daytime and nighttime hours as defined by the regulations (see below). Existing noise sources in the area include traffic noise along Interstate 70, freight trains on the tracks to the south, local traffic, and agricultural and ranch activities. COLORADO • WISCONSIN CO 303.666.0617 • www.hankardinc.com • WI 608-345-1445 HANKARD EN VIRONMENTAL FIGURE 1: Red Barn Guest Ranch — Source Locations of Live or Amplified Music Noise Study Results for the Red Bam Guest Ranch in Silt, Colorado August 23, 2017 2 HAND° ENVIRONMENTAL -_ -- A• r• rV1M1flA11011 APPLICABLE NOISE REGULATIONS Noise from live and amplified music at RBGR was analyzed in accordance with Garfield County's Land Use Resolution Code, Article 7-301 B.2. This code references the maximum permissible noise levels given in Colorado Revised Statutes (CRS) §25-12, which are shown in Table 1. The applicable noise level limit depends on the time of day and the land use zone of the land adjacent to the project. TABLE 1: Maximum Permissible Noise Levels - Colorado Revised Statutes §25-12 Land Use Zone Maximum Noise Level (dBA) Daytime (1) (2) Nighttime (2) (7:00 am to 7:00 pm) (7:00 pm to 7:00 am) Residential 55 50 Commercial 60 55 Light Industrial 70 65 Industrial (3) 80 75 )1) During the daytime, noise levels can increase by 10 dBA for 15 minutes in any one-hour period (2) Noise level limit decreased by 5 dBA for intermittent shrill -type sounds (3) For construction and development operations, the Industrial limits apply to all zones. Compliance Locations CRS §25-12-103 defines the measurement location at which compliance is defined as twenty-five feet or more outside the property line of the noise source. Time of Day CRS §25-12-103 defines "daytime" as 7:00 am to 7:00 pm and "nighttime" as 7:00 pm to 7:00 am. The proposed music would occur during both daytime and nighttime hours. In addition to the levels given in Table 1, daytime noise levels may exceed their respective limits by 10 dBA for 15 minutes in any one hour. For example, on residential -zoned land, noise levels may be as high as 65 dBA during daytime hours for up to 15 minutes in any one hour, but otherwise cannot exceed 55 dBA. Land Use The strongest determinant of the applicable noise limit is adjacent land use. As shown in Figure 2, all RBGR-adjacent land to the north is residential, and land in all other directions is a mixture of residential and agricultural. The noise level limits at residential land uses are 55 dBA (daytime) and 50 dBA (nighttime). CRS §25-12 does not explicitly define noise level limits for agricultural land uses. However, in previous Garfield County noise studies (e.g. Revised Analysis of Noise from Proposed Cerise Gravel Pit for United Companies, Hankard Environmental Inc., November 2014) the Light Industrial noise limits were applied at the property line and the Residential land use limits were applied at the physical location of any occupied residential structure. Based on this, the most restrictive (i.e. nighttime) noise limits to be met 25 feet outside the RBGR property line are 65 dBA for agricultural land and 50 dBA for residential land. Nc:s 5iucy Results for the Red Bam Guest Ranch in 5iii, Colorado 3 August 23, 2017 HANKARD ENVIRONMENTAL Yi E3i�I��f„j� Residential Residential 218168 640 f i � I ti. 4 filar-'�'�3 Residential 3.r tri r:_,rr� 'Mier ir IMF .0 Agricultural Agricultural Agricultural FIGURE 2: Red Barn Guest Ranch - Surrounding Land Uses (Data Source: Garfield County Land Explorer) Noise Study Results for the Red Bam Guest Ranch in Silt, Colorado 4 August 23, 2017 HANKARD ENVIRONMENTAL A • 1.11 1.7 x,;l. VINAA:i,:n MEASUREMENT METHODS To assess compliance with the applicable noise regulations, amplified music was played at the two locations identified in Figure 1 while sound level measurements were conducted near the RBGR property line. These measurements were conducted on August 16, 2017 from about 10:00 am to about 1:00 pm. The details of the sound level measurements are given below. Measurement Locations Two sets of noise level measurements were conducted. The first set was with amplified music played on the stage in the open patio area. Ten noise measurements were conducted on the RBGR property and at its property line as shown in Figure 3. The second set of measurements was with the same amplified music played inside the red barn, on the second floor in the northwest corner of the room. Noise measurements were conducted at the four locations shown in Figure 4, which were selected to represent worst-case (loudest) receiver locations. Equipment Noise measurements were conducted using two Larson Davis LxT sound level meters (serial numbers 4616 and 4617). These meters meet American National Standards Institute (ANSI) specifications for Type 1 sound level meters, which correspond to an accuracy of ±1 dB. The meters had been calibrated at a traceable laboratory within the previous twelve months. Each sound level meter was mounted on a tripod with its microphones set at a height of five feet above the ground, and each microphone was fitted with seven -inch -diameter outdoor windscreens. Each system was field calibrated prior to the measurements and re -checked after retrieval, and the calibration drift was less than ±0.1 dB. Equipment Settings The sound level meters were time -synchronized, and set to continuously monitor noise levels and log results every minute. Recorded metrics included both A -weighted and C -weighted 1 -minute overall equivalent noise level (Leg), and A -weighted 10 -second overall Ley. Sound Source Each amplified music setup included two portable powered speakers, which were operated by a professional disc jockey. Various music styles were initially tested, and one song (Everyday by Incognito, 1995) was selected (Everyday by Incognito, 1995) that included a reasonable mixture of both high and low frequency content. This song is approximately 4 minutes and 45 seconds long. A typical sound level was set for each location based on the experience of the professional disc jockey and Hankard Environmental staff. These "source" sound levels were measured near the stage of each source location. After setting the source level, the song was repeated as necessary to conduct the multiple sound level measurements around the RBGR property line. Noise Study Results for the Red Bam Guest Ranch in Silt, Colorado 5 August 23, 2017 HAND° EN VIRONM ENTAIL AC -Me. 'Mr.- - .l 4•113f.,C: 01.11• 1.• •• FIGURE 3: Noise Measurement Locations for Outdoor Patio Music Site Noise Study Results for the Red Gam Guest Ranch in Silt, Colorado August 23, 2017 ti HANKARD ENVIRONMENTAL .1C --.111r,. r . FIGURE 4: Noise Measurement Locations for Indoor Barn Music Site Noise Study Results for the Red Bam Guest Ranch in Sitt, Cabrado August 23, 2017 !TANKARD ENVIRONMENTAL AC_ .6._ � — A ::3 ANP) VIe0A.igp MEASUREMENT RESULTS AND ASSESSMENT As previously described, two sets of noise measurements were conducted. In the first set, the music source was at the outdoor patio area. In the second set, the music source was inside the red barn. Weather conditions were suitable for measurement and normal for the area, with ground winds from the southwest at 0 to 3 miles per hour, air temperature of approximately 79°F, and 30% relative humidity. Measurements were conducted on or near the RBGR property line rather than 25 feet outside the property line. Because measured noise levels depend primarily on distance from the source, measuring farther away from the source would result in slightly lower measured levels. An additional element of conservatism is that all levels were taken as measured - no corrections (reductions) were made for steady background noise. I-70 is approximately 0.35 miles to the south, and traffic noise was always audible at the measurement locations. The only corrections that were made were the removal of time periods when individual vehicle pass-bys on the adjacent local roadways were audible and affected measured levels. Outdoor Patio Noise Measurement Results Table 2 lists the land use type, applicable noise level limit, and loudest measured noise level (1 - minute Leq) at each location, and whether it complies with Garfield County's Land Use Resolution Code, Article 7-301 B.2. These noise levels would be expected to occur when the measured noise level 25 feet from the stage near the center patio support beam is 86 dBA / 97 dBC (Location Al) and is 68 dBA / 81 dBC at 130 feet from the stage (Location A2). As shown in Table 2, all measured noise levels are at or below 50 dBA along the property line, and all meet the most restrictive noise level limit regardless of the applicable land use. Therefore, all measured levels show compliance with the applicable noise regulations. TABLE 2: Measured Noise Levels from Amplified Music at Outdoor Patio Area Measurement Location Description Applicable Land Use Nighttime Max Measured Noise Level Limit 1 -Minute Leq Compliance? (dBA) (dBA) Al Source N/A N/A 86 N/A (25 feet from stage) A2 Source N/A N/A 68 N/A (130 feet from stage) A3 East (driveway) Light Industrial 65 47 Yes A4 Northeast Residential 50 44 Yes A5 North Residential 50 44 Yes A6 Northwest Residential 50 46 Yes A7 Southwest Light Industrial 65 40 Yes A8 Southwest Light Industrial 65 48 Yes A9 South Light Industrial 65 48 Yes A10 South Residential 50 50 Yes Noise Study Results for the Red Bam Guest Ranch in Silt, Colorado August 23, 2017 8 HAND ENVIRONMENTAL Arui1sri• s aq[+ hi, A,jCHh Cnr+;., �•en Indoor Barn Noise Measurement Results Table 3 lists the land use type, applicable noise level limit, and loudest measured noise level (1 - minute Ley) at each location, and whether it complies with Garfield County's Land Use Resolution Code, Article 7-301 B.2. These levels would be expected to occur when the indoor measured noise level 30 feet from the speakers is 81 dBA and 98 dBC. Note that for these measurements the barn door on the first floor was left open. As shown in Table 3, all measured levels are at or below 50 dBA along the property line, and all meet the most restrictive noise level limit regardless of the applicable land use. Therefore, all measured levels show compliance with the applicable noise regulations with the barn in its current (unimproved) condition. TABLE 3: Measured Noise Levels from Amplified Music at Indoor Barn Area Measurement Applicable Nighttime Max Measured Location Description Land Use Noise Level Limit 1 -Minute Leq Compliance? (dBA) (dBA) B1 Source N/A N/A 81 N/A (30 feet from speakers) B2 Southwest Light Industrial 65 48 Yes B3 South Residential 50 45 Yes B4 Southeast Residential 50 43 Yes CONCLUSION Based on our measurements and analysis, live and amplified music taking place at the outdoor patio area and on the second floor of the indoor barn at the Red Barn Guest Ranch will comply with Colorado Revised Statutes §25-12, and therefore with the Garfield County Land Use Resolution Code, Article 7-301 B.2., under the following conditions: 1) Sound levels of music emanating from the outdoor patio area do not exceed 86 dBA and 97 dBC at 25 feet from the stage or 68 dBA and 81 dBC at 130 feet from the stage during nighttime hours (7:00 pm to 7:00 am). Noise levels during daytime hours can be 5 dBA greater. 2) Sound levels of music emanating from the second -floor indoor barn area do not exceed 81 dBA and 98 dBC at 30 feet from the speakers during nighttime hours (7:00 pm to 7:00 am). Noise levels during daytime hours can be 5 dBA higher. The downstairs barn door can remain open. Noise Study Results for the Red Bam Guest Ranch in Silt, Colorado 9 August 23, 2017 Ham° ENVIRONMENTAL I 711i= .•01I141 AND •NGA f.,q {'•'a .a r., f. Thank you for commissioning Hankard Environmental to conduct this noise study. Please contact us with any questions or comments. Sincerely, Jeff Cerjan Senior Acoustical Consultant CC: Mike Hankard, Hankard Environmental Nose Study Results for the Red Barn Guest Ranch in Silt Colorado August 23, 2017 10