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<br /> <br />Veneklasen Associates <br /> <br />New Lake Elmo Elementary School Noise Study; Lake Elmo, Minnesota <br />Property Noise Measurement Summary; Veneklasen Project No. 8512-002 <br />October 28, 2024; Page 5 of 9 <br /> <br />Month Day, Year; Page 5 of 9 <br /> <br /> <br />www.veneklasen.com <br /> <br />Figure 2. Increased Fall-Time Occupancy Noise Model <br /> <br /> <br />Given that this method is primarily used for constant sound sources (e.g., free flowing traffic or mechanical <br />equipment), using it for an intermittent sound source like gunfire will likely result in an overestimation of increased <br />noise. When summing constant and equal sound sources, the two will always overlap because they are consistently <br />running and therefore double; when summing intermittent sound sources, whether or not the overall acoustic <br />pressure doubles or is less than double depends on whether the intermittent events line up in time or not. <br /> <br />Additionally, occupancy data provided to Veneklasen is highly variable when comparing July of 2023 to July of 2024. <br />On average, weekends in July of 2023 were ten persons lower than weekends in July of 2024. Given that the highest <br />occupancy weekend day in either year during this month was 38 people, this is a statistically significant swing. <br />Therefore, Veneklasen has used the 90th percentile of occupancy data for July of 2024 and for fall of 2023 to evaluate <br />a case where a large number of patrons happen to v isit the club on a particular day. All occupancy data provided to <br />Veneklasen by gun club ownership can be found in the appendix. <br /> <br />High-Caliber Firearms <br /> <br />In careful analysis of the measurement data, it was observed that there were instances where the hourly noise level <br />on a particular day would be substantially higher than the other measured hourly levels on that same day. It was <br />found that these were due to louder individual gunshot events occurring within said hour (or hours) as compared to <br />other hours. These were uncommon in the measured data. As mentioned previously, gun club management provided <br />a demonstration for Veneklasen at each of the firing bays so that short-duration acoustic measurements could be <br />conducted and compared to the noise monitoring positions in order to calibrate an acoustical model. One of these <br />was a 45-caliber firearm. <br /> <br />L1: 59dBA <br />L2: 57dBA <br />L3: 57dBA <br />L4: 60dBA