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n <br />� �� . <br />AMERICAN <br />ENGINEERING <br />�� TESTING, INC� <br />PROJECT: <br />ROCKCRUSHER <br />nV�llfl� <br />r��� <br />pEC 16 2004 <br />J4� Fun� �`osk <br />► ' � ► � \� 1/ �\ � ► \ <br />SOUND MONITORING <br />12500 RICH VALLEY BLVD. <br />ROSEMOUNT, MINNESOTA <br />REPORTED TO: <br />CONSULTANTS <br />. GEOTECHNICAL <br />. MATERIALS <br />. ENVIRONMENTAL <br />SHAFER CONTRACTING COMPANY, INC. <br />P.O. BOX 128 <br />SHAFER, MN 55074 <br />ATTN: SCOTT SPISAK <br />AET` JOB NO: 20-04834 DATE: DECEMBER 14,2004 <br />INTRODUCTION <br />This report presents the results of noise monitoring wark performed during operation of rock <br />crushing equipment located in Rosemount, Minnesota. The scope of our work was limited to <br />monitoring noise levels at 50' intervals from the equipment. Our work was authorizedby Mr. Scott <br />Spisak of 5haf�r Contracting on November 30,2004. <br />RESULTS <br />The monitoring wark was performed on December 2,2004. The gravel pit had approximately40' <br />side walls. Monitoring was performed at 5' above the gravel pit floor on December 2, 2004. <br />— Measurements were taken from the loudest side of the rock crusher and generator. The monitoring <br />— path was down wind from the noise and the wind speeds ranged &om 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(10} <br />and L(50} values were programmedto be calculated. <br />Lf 10� - The sound level which is exceeded ten percent of the time for a survey. <br />�(,5 D� - The sound level which is exceeded fifty percent of the time for a survey <br />The results of noise monitoring at the locationsproximateto the rock crusher are listed as follows: <br />Distance From Source I.�1.�,1 L(50) AVERA(CE SOUND LEVEL <br />50' 87.0 db 86.5 db 86.5 db <br />100' 85.0 db 84.0 db 84.0 db <br />150' 79.5 db 79.0 db 79.0 db <br />200' 77.0 db 76.0 db 76.0 db <br />250' 76.5 db 74.5 db 74.5 db <br />300' 75.0 db 73.o db 73.0 db <br />Reference should be made to the attached tabulation page for specific recording information. <br />This document shall not be reproduced, except in tul€, without mit#en approval ol American Engineering Testing. Ina <br />550 Cleveland AvenueNorth . St. Paul, MN 55114. 651-659-9001. Fax 651-659-1379 <br />Duluth . Mankato. Marshall. Rochester. Wausau . Rapid City. Pierre. Sioux Falls <br />AN AFFIRMATNEACTION At�U EOUAL DPPOR7UNITY CMPLOYCR <br />