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0 6 C b) Tabel A below establishes the maximum permissible noise <br /> levels for permitted uses in the NC-2, CC-3, GC-4, EC-5, <br /> - 1-2 and 1-3 districts. Measurements shall be taken at <br /> the boundary lines of the zoning lot in the case of NC-2 <br /> and 1-2 districts and at the districts boundary lines for <br /> CC-3, GC-4, EC-5, 1-3 and AS districts on which the use is <br /> located, and, as indicated the maximum permissible noise <br /> levels,.vary according to the zoning of the lot adjacent <br /> to the lot on which the use is located. <br /> TABLE A <br /> Maximum Permitted Sound Levels dB(A) - <br /> (re: 0.0002 Micrabar) <br /> Zoning of Lot Zoning of Adjacent Lot <br /> Residential or PD Commercial industrial <br /> 7:00 am 7:00 pm - - 7:00 ate".''7:00am .7:00 <br /> 7:00 pm 7:00 am - 7:00 pa: 7:00pm 7:00 a <br /> NC-2, 1-2 SO 45 SO 55 -: _ 60 65; <br /> = CC-3, GC-4, EC-5 50 45 . 55 60 65 7D <br /> I-3 and AS <br /> NOTE A: <br /> A decibel is a measure of a unit of sound pressure. Sound <br /> waves having the same decibel level "sound"loud or softer <br /> to the human ear depending upon the frequency of the sound <br /> wave in cycles per second (i.e. , whether the pitch of the <br /> sound is high or low) . Thus, an A-weighted filter, construc- <br /> ted in accordance with the specifications of the American <br /> National Standards Institute, which automatically takes <br /> account of the varying effect on the human ear of different <br /> pitches shall be used on any sound level measurements re- <br /> quired by this section. Accordingly, all measurements are <br /> expressed in dB(A) to reflect the use of this A weighted <br /> filter. <br /> NOTE B: <br /> The standards established in Table A in terms of the Equi--= - <br /> valent sound Level (leg) which must be calculated by taking <br /> 100 instantaneous A-weighted sound levels at ten second in- <br /> tervals and computing the Leg in accordance with standard <br /> ANSI procedures. <br /> c) Impact noises are sounds that occur intermittently rather <br /> than continuously. Impact noises generated by sources that <br /> do not operate more than one minute in any one hour period <br /> are permissible up to p. level of lOdhA in excess of the <br /> figures listed in Table A, except that this higher level <br /> of permissible noise shall not apply from 7:00 pm to 7:00 am. <br /> 6-16 - <br />