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i <br />1 <br />1 <br />TABLE 3.6-2 <br />SUMMARY OF EPA NOISE LEVELS IDENTIFIED AS REQUISITE <br />TO PROTECT PUBLIC HEALTH AND WELFARE WITH <br />AN ADEQUATE MARGIN OF SAFETY <br />:......... . <br /> <br />.:.....:..:.:. <br />vet .... .............: <br />:.:........:Effect':;'.'':';':: <br />:.;..;::;:':.:.:"':!'::::::' '.'';'"':.... Pa. <br />Leq(Zq) < 70 dB(A) Hearing loss All azeas <br />Ldn < 55 dB(A) Outdoor activity Outdoors in residential areas and farms and other <br /> outdoor areas where people spend widely <br /> varying amounts of time, and other places in <br /> which quiet is a basis for use. <br />Leq(24) < 55 dB(A) Outdoor areas where people spend limited <br /> amounts of time, such as school yards, <br /> playgrounds, etc. <br />Ldn < 45 dB(A) Indoor activity, Indoor residential areas <br /> interference, and <br /> annoyance <br />Ldn < 45 dB(A) Other indoor azeas with human activities, such <br /> as schools, etc. <br />+ The hearing loss level identified here represents annual averages of the daily level over a period of 40 <br />years. (These are energy averages, not to be confused with arithme[ic averages.) <br />Leq(Zq) Equivalent sound level fora 24-hour period <br />Ldn Day night sound level [Noise occurring at night (10 PM to 7 AM) is considered to have more of an <br />impact than noise during daytime hours.] <br />Source: EPA 1974 <br />Sheet 1 of 1 <br />