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03 E 1 .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 /> Maxiim Permitted Sound Levels dB(A) . - <br /> (re: 0.0002 Microbarl <br /> Zoning of Lot Zoning of Adjacent Lot <br /> Residential or PD Commercial Industrial <br /> 7:00 am 7:00 pm - 7:00 in ._71O0am J7:00 pr <br /> 7:00 pm 7:00 am - 7:00 pm 7:0Opm 7:00 el <br /> • NC-2, I-2 50 45 50 S5 - 60 65 <br /> • " CC-3, GC-4, EC-5 50 45 55 60 - 65 70 <br /> I-3 and AS - <br /> • NOTE A: <br /> lc 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 ons 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 a level of l0dbA in excess of the <br /> 1::. <br /> figures listed in Table A, except that this higher level <br /> of P ermissible noise shall not apply from 7:00 pm to 7:00 am <br /> • <br /> 6-16 • <br /> ax - <br />