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2 Sound Assessment Objectives <br />Primary objectives of a noise assessment is to determine compliance with Minnesota <br />noise standards (Mn Rule 7030) or make improvements in the project to ensure <br />compliance with the noise standards. These are RECEIVING land use and not SOURCE <br />standards. . <br />Dayti me N ightti me <br />Noise Area Classification L10 L50 L10 L50 <br />1- Residential 65 60 55 50 <br />2-Commercial 70 65 70 65 <br />3- Industrial 80 75 80 75 <br />L10 is the A-wei�hted decibel level exceeded 10% or 6 minutes in an hour <br />L50 is the A-wei�hted decibel level exceeded 50% or 30 minutes in an hour <br />There is no Maximum sound level limit. <br />The A-weighted decibel (dBA or dB (A)) is an expression of the relative loudness of <br />sounds as perceived by the human ear. <br />NAC 1: Re�idential housing, religious acti�ities, camping �nd picnicking areas, health ser�ices, <br />hotels, educational seruices <br />NAC �: Retail, business and government services, recreatianal activities, transit passenger <br />terminals <br />NA� 3: Manufacturing, fairgraunds and amusement parks, agricultural and for�stry activities <br />fVAC 4: Unde�eloped �nd unused land <br />