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*:/:I1-3Ill WA <br />Existing Noise Conditions <br />Both the 6th Street and Raitt Street Sites propose skate parks with lighting for evening use. Noise monitoring <br />was conducted at a similar existing skate park with evening hours and lighting (i.e., Harvard Skate Park in the <br />City of Irvine), as described below. In addition, to determine baseline noise levels, an ambient noise <br />measurement was conducted at the existing 6th Street Site. <br />The sound level meter used for noise monitoring (Larson Davis I xT) satisfies the American National Standards <br />Institute (ANSI) standard for Type 1 instrumentation. The sound level meters were set to "sloes' response and <br />A' weighting (dBA). The meters were calibrated prior to and after the monitoring period. All measurements <br />were at least five feet above the ground and away from reflective surfaces. Noise measurement locations are <br />described below and shown in Figure 17, Approximate Noise Monitoring Locations at Harvard Skate Park, and Figure <br />18, Approximate Noise Monitoring L ocakon at 6tb Street Site. Table 4, ShortTermNoise Measurement Levels at Varying <br />Distances (d84 L,,j, shows noise monitoring results from the four short-term noise monitoring locations. <br />Table 4 Short -Term Noise Measurement Levels at Varying Distances (dBA Leg) <br />Monitoring Site <br />L, <br />L,,,, <br />6, <br />L2 <br />to <br />U <br />Lm <br />ST-1, Harvard Skate Park <br />62.6 <br />76.1 <br />52.1 <br />69.7 <br />66.2 <br />62.9 <br />60.2 <br />Edge of skate area <br />ST-2, Harvard Skate Park <br />55.6 <br />69.6 <br />47.6 <br />61.7 <br />58.8 <br />55.7 <br />54.0 <br />25 feet from skate area edge <br />ST-3, Harvard Skate Park <br />58.6 <br />71.1 <br />48.6 <br />63.3 <br />59.0 <br />55.9 <br />53.8 <br />5 feet from skate area edge <br />ST-4, 6th Street Site ambient <br />47.6 <br />1 59.9 <br />40.8 <br />54.1 <br />1 50.5 <br />47.6 <br />1 45.5 <br />Noise monitoring conducted on March 23, 2019, during the hours of 6:00 PM — 7:30 PM, and March 26, 2019, during the hours of 7:30 PM and 8:00 PM. <br />Harvard Skate Park <br />The skate park is approximately 8,000 square feet, and has a couple of rails, one bowl, quarter ramps, several <br />decks, and roll -ins. The skate park is approximately 15 feet north of the nearest residences. There is an <br />approximate 8-foot wall between the skate park and the residences. Three short-term (ST) 15-minute noise <br />measurements were conducted, as described below. <br />ST-1 was conducted on March 23, 2019, beginning at 6:14 PM. The measurement was taken at the eastern edge <br />of the skate park. Primary noise sources were skating activity and speech. At the time of measurement there <br />were 4 to 6 active skaters and several observers. Noise levels at the park ranged from 52 to 75 dBA leq. Noise <br />levels associated with the following activities were observed: speech such as talking and cheering ranged from <br />61 to 68 dBA Ley; wheel to ground contact was observed to be 64 dBA IRq; boards and equipment falling ranged <br />from 66 to 75 dBA Leq, depending on proximity to sound level meter; use of quarter ramps for wheel to ramp <br />contact was observed at up to 70 dBA leq; and ambient background noise levels ranged from 52 to 57 dBA I q. <br />Ambient background noise consisted of distant traffic from Jamboree Road, birds, other park uses, and parking <br />lot movement and activity. <br />75C-104 <br />