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042 <br /> gib) 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 (I_ <br /> CC-3, GC-4, EC-5, I-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 am.-=-7:,00am 7:00 . <br /> 7:00 pm 7:00 am - 7:00 pm 7:00pm 7:00 a: <br /> NC-2, I-2 50 45 50 55 - -- 60 65 <br /> CC-3, GC-4, EC-'5 50 45 55 60 65 70 <br /> I--3 and AS <br /> NOTE A. <br /> A decibel is a measure of a unit of sound pressure. Sound <br /> IC <br /> waves having the same decibel level "sound" loud or softer <br /> to the human ear depending� (i.e. ,un whetheze�the pitch the sound <br /> of d <br /> wave in cycles per sec <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 Instep effect which <br /> human ear of different <br /> account of the varying <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 S: <br /> The standards established in Table A an terms of the. Equi <br /> val.ent 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 <br /> by roux��that _ <br /> than continuously. Impact noises generated <br /> do not operate more than one minute in any one hour period <br /> are permissible up to a, level oft10 that excess of the <br /> level - <br /> figures listed in Table A, excep <br /> ofgr <br /> of permissible noise shall not apply from 7:00 pm to 7:00 am <br /> • 6-16 - <br />