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Why was the Minnesota daytime residential standard set at an L10 of 65 dBA and an L50 of 60dBA?

April 26, 2017daytime DBA l10 l50 Minnesota Residential standard

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Why was the Minnesota daytime residential standard set at an L10 of 65 dBA and an L50 of 60dBA?

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A. These standards describe the limiting levels of sound established on the basis of present knowledge for the preservation of public health and welfare. These standards are consistent with speech intelligibility and annoyance requirements for receivers within the impacted areas.