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<br /> <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />AET JOB NO: 20-04834 <br /> <br />DATE: DECEMBER 14, 2004 <br /> <br />INTRODUCTION <br /> <br />This report presents results of monitoring work performed during operation of rock <br />located Rosemount, Minnesota. The scope of our work was limited to <br />noise levels at intervals from equipment. Our was authorized by Mr. Scott <br />Shafer Contracting on November 30, 2004. <br /> <br />RESULTS <br /> <br />The monitoring work was performed on December 2004. The gravel pit had approximately 40' <br />Monitoring was performed at 5' above pit Hoor on December 2, <br />Measurements were taken from the loudest side ofthe rock crusher and generator. The monitoring <br />path was down wind from the noise and the wind speeds ranged from 5 to 15 mph. The monitoring <br />interval was 10 minutes in each location. Upon completion of the monitoring, the data from the <br />sound meter was downloaded into a computer for analysis and compilation. Specifically, the L(lO) <br />and L(50) values were programmed to be calculated. <br /> <br /> <br />L(10) - The sound level which is exceeded ten percent of the time for a survey. <br />L(50) - The sound level which is exceeded fifty percent of the time a survey <br /> <br />The results noise monitoring at the locations proximate to the rock crusher are listed as follows: <br /> <br />Distance From Source <br /> <br />L(lO) <br /> <br />L(50) <br /> <br />AVERAGE SOUND LEVEL <br /> <br />100' <br />150' <br />200' <br />250' <br />300' <br /> <br />87.0 db <br />85.0 db <br />79.5 db <br />77.0 db <br />76.5 db <br />75.0 db <br /> <br />86.5 db <br />84.0 db <br />79.0 db <br />76.0 db <br />74.5 db <br />73 .0 db <br /> <br />86.5 db <br />84.0 db <br />79.0 db <br />76.0 db <br />74.5 db <br />73.0 db <br /> <br />Reference should be made to the attached tabulation page for specific recording information. <br /> <br />