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<br />0/ <br />1 <br /> <br />.J <br /> <br />l <br />.1 <br />:1 <br /> <br />l <br />I <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />1 <br /> <br />j <br /> <br />::. <br /> <br />Section 1.0 <br /> <br />Introduction <br /> <br />1.1 Purpose <br /> <br />SOl11lds ge=ted by indUBtry, /ranspartation and nonruiJ. day 10 day activities are <br />receiving attention by the general publiC- Sound gererated by aggregate processirig plants <br />is among the industries that are becoming a local interest Expanding residential <br />developments are encroaching on the areas where aggTegate processing plants ope:tate. <br />~ed neigbbon; are becomi.ng more interested. in aggregate processing plant <br />operations in their neighborhoods. To this end, a stndy was conducted last construction <br />season (2003) to measure, record and cOmment on 1he sound levels genernted by nOIlIla! <br />operation of aggregate processing plants. The result of these sonnd pressure readings is <br />used 10 detemrine any potential problems with SOllnd leaving the plant sire boundaries <br /> <br />. . <br /> <br />and to examine any preYeaItive measui-es to any problems that may exists. <br /> <br />12 Aconstics <br /> <br />In order 10 put the data reCorded into perspective, it is lIeCessary to nnde.rst:and <br />how SOII1ld is ~ When an ~ moves it]JlUdnces a v:ibrntion. WIleD an ~ <br /> <br />~ . .... <br /> <br />~ in the lIImosphcre it moves air ~ around it, and in tam, these air ~ <br />DlOVe air par/icJes aroJmd ~ aeating a puhie of fhe v.ibration ~ the air. Soo.Dd ill <br />IDeIlSlIred in decibel (~. bdh of a bel), Which is the 8IDOOnt of air JllQSDre on Ibe <br /> <br />ea.c:h.uw. <br /> <br />,~" <br /> <br />1he Immon. air )IOWl1iW;!; MlUDd dIlIt OCCIID: wiIhin lac ~ DIlBC of 2(Hz <br />(Brm) - DJh.1D ......1Ie JiDm.m air wiII dIact IOlIIld k is ~ lie ....., <br />~ wIIid1. · ....... of~. A ~ A~ ~. ... <br />~ III IIIllU1Ire III lie cIaaup: ill -...mYity .tae CIIIr wiIh ~ III ~-y_ <br />SWllllIeWlI--....cIislyJJbDy dc:molilld as cIrdbcIs (elBA). <br />