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Nov, 15 01 05. 44p <br />p.6 <br />ml/536' <br />ZABLE I <br />NOISE ORDINANCE LIMITS <br />FOR RESIDENTIAL PROPERTY(l) <br />ALl''OWED T IMIT <br />EXTERIOR INTERIOR. <br />ALLOWED I.C3R-ATIQN DAY IGHT DAY 'NIGHT SYMBOL <br />30 minutes in hour 55 5q -- L50 <br />15 minutes in hour 60 55 -- -- L25 <br />5 minutes in hour 65 60 55 45 i48 <br />1 minute in hour 70 65 60 50 L2 <br />Anytime .in hour 75 70 65 55 Lmax <br />(1) ]day = 7:00 A.M. to 10:00 P,M. <br />Night = 10;00 P.M, to 7:00 A.M. <br />(2) a. The levels are lowered 5 dRA for noise collsisting of <br />music or speech. <br />b. The allowed durations may be extended when the ambier�t <br />exceeds the allowed levels with the exception of t1le <br />maximum where the level may be increased. <br />The adjustments work in the fallowing manner:: <br />If the source of the noise contains -Mu;ic ox <br />speech, then all the levels are reduced 5 d3A <br />but the durations to which they apply remain the same. <br />2. If the ambient without the source has maximum <br />noise levels which exceed the alloyed maximum <br />noise level, then the allowed maximum noise level is <br />increased to equal the ambient maximum level. For <br />example, if the highest reading (Lmax) du -ring the day <br />were 78 dBA, then.the allowed level for any source being <br />investigated would become 78 dBA, not 75 d13A as listed in <br />Table 1 <br />3 . If the ambient without the source baa dui �zt3,cazis <br />for the allowed Levels that are longer than <br />listed, then the allowed duxatign is ixlu eased, not the <br />level. For exatnpl,e, if the day level of 60 dBA were. <br />exceeded 20 minutes in any hoar, then the allowed <br />duration would become 20 minutes, not 15 minutes as <br />listed in Table 1. ROwever, the threshold mould remain <br />at 80 dBA. <br />It is not readily obvious that the listings in 'Table 1. do <br />not produced a Outooth carve for the paired combinations of level <br />and duration. The curve is really a step curve. This curve is <br />5 <br />