Agenda - 11-03-1986 - Laserfiche WebLink

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. , . , . • • • b) Tabel A below establishes the maximum permissible noise - i . levels for permitted uses in the NC-2, CC-3, GC-4, EC-5, . • 1-2 and 1-3 districts. Measurements shall be taken at the boundary lines of the zoning lot in the case of NC-2. 1 ' and 1-2 districts and at the districts boundary lines for • (". . • CC-3, GC-4, EC-5, 1-3 and AS districts on which the use is - located, and, as indicated the maximum permissible noise . levelsomary according to the zoning of the lot adjacent to the lot on which the use is located. • . . . _. . .. • . . . - , TABLE A • • . . . . * Maectlamm Permitted Sound Levels dB(A) . , . . . . • . . . . • • . . ., . . . (re: 0.0002 MicrObar) • . . . Zoning of Lot . Zoning of Adjacent Lot . . . Residential or PD Commercial industrial • • • . , - . 7:00 am. . 7:00 pm - ' 700 am'.1.1.00am .77:00 . . . • . ' 7:00 pm . 7:00 are . 7:00 pm 7010pe 7:00 . . . , • . • . . , . NC-2, 1-2 • • . 50 - • 45, .. 50 . 55 . - . SO . et' . . ^;* ' .CC-3, GC-4, EC-5 - , SO 45 . 55 60 65 , • 70 •'.• 1-3 and AS . . • , . . . . . . . . • . NOTE A: . . . . NOTE ' . , . • . . . . ' . A decibel is a measure of a unit of sound pressure. Sound. . waves having the same decibel level "sound" loud or softer . to the human ear depending upon the frequency of the sound * . . *. • wave in cycles per second (i.e., whether the pitch of the sound is high or low) . Thus, an A-weighted filter, construe- . , . ted in accordance with the specifications of the American • • National Standards Institute, which automatically. takes . . account of the varying effect on the human ear of different . . pitches shall, be. used on any sound level measurements re- . .quired by this section. Accordingly, all measurements are . . . , expressed in dB(A) to reflect the use of this 4-weighted : . . filter. . . . ' . NOTE B: . . . . . The standards established in Table A in terms of the Equi- valent sound Level (leg) which must be calculated by. taking 100 instantaneous A-weighted sound levels at ten second in-• . tervals and computing the Leg. in accordance with standard - ANSI procedures. . . . . . . e • c) Impact noises are sounds that occur intermittently rather • . . • than continuously. Impact noises generated by sources that do not operate more than one minute in any one hour period . . • are permissible up to P. level of 10dbA in excess of the . figures listed in Table A, except. that this.higher level • . ( . of permissible noise shall .not apply from 7:00 pm to 7:00 em . . . . . - . . , . . , . . . . . . ' . , . . . . . . • 6-16 . , • ' . . _