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Mr. Steve Pullar Elk River Sportsman's Club Noise Measurements Noise Code Requirements May 27, 2022 Page 2 The State of Minnesota passed the Shooting Range Protection Act in May 2005, which is currently in Minnesota Statues, Chapter 87A Shooting Ranges. The intent of the act is "to provide shooting ranges with the ability to maintain their operating capacity, if loca/ opposition to an existing shooting range facility arises." Section 87A.05 Noise Standards describes the allowable noise levels for the operation of a shooting range. It states that "allowable noise levels for the operation of a shooting range are the levels determined by rep/acing the steady state noise L 10' and L502 state standards for each period of time within each noise area's c/assification with a single Leq(h) standard for impulsive noise that is two d8A lower than that of the L 10 level for steady state noise. The noise level shall be measured outside of the range property at the location of the receiver's activity according to Minnesota Rules, parts 7030.0010 to 7030.0080...Leq(h) means the energy level that is equivalent to a steady state level that contains the same amount ofsound energy as the time varying sound leve/ for a 60-minute time period. " Section 87A.04 Mitigation Area describes "a change in use, new development, or construction of a structure subject to this section may be approved if the person seeking the approva/ or, at the discretion of the governing body, the approving authority agrees to provide any mitigation required to keep the range in compliance with this chapter. The person requesting an approval subject to this section is responsib/e for the mitigation if the failure to provide the documentation or required mitigation is the sole basis for the range being out of compliance with the shooting range performance standards... With the permission of the range operator, any mitigation required under this section may be provided on the range property." To help clarify the above language, we have included references and explanations below. First, Minnesota Rule 7030: Noise Pollution, prepared by the Minnesota Pollution Control Agency (MPCA), has requirements for maximum allowable sound levels by receiving land use evaluated at the point of the nearest receiver. Table 1 shows the Rule 7030 L10 and L50 noise limits per noise area classification (NAC). NAC 1 is residential and recreational land use, NAC 2 is commercial, and NAC 3 is industrial. Table 1- MPCA Noise Requirements Noise Area Receiver Daytime (7AM - 10PM) Nighttime (10PM - 7AM) Classification Type L10 L50 L10 L50 1 Residential 65 dBA 60 dBA 55 dBA 50 dBA 2 Commercial 70 dBA 65 dBA 70 dBA 65 dBA 3 Industrial 80 dBA 75 dBA 80 dBA 75 dBA ' L10 is the sound level that is exceeded 10% of the time during a measurement period. z L50 is the sound level that is exceeded 50% of the time during a measurement period.