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<br />Monitoring Results: <br /> <br />Results of the area survey indicated the dust collector basically added 12-15 dB (61-67 dBA) of <br />noise above background levels at 25 feet, 3-7 dB (61-63 dBA) at 50 feet and 2-4 dB (55-59 dBA) <br />at 100 feet (Appendix E). <br /> <br />Noise monitoring in the community indicated noise levels of 47 dB L50 Daytime, 53 dB L10 <br />Daytime and 47 dB L50 Nighttime and 48 dB L10 Nighttime (Appendix F). <br /> <br />Discussion of Results: <br /> <br />The community noise monitoring results indicated the noise levels from the industrial area to be <br />within the limits established in 7030.0040 Subp. 2 Noise Standards, that is, less than 60 dB L50 <br />Daytime, 65 dB LlO Daytime, 50 dB L50 Nighttime, and 55 dB L10 Nighttime. <br /> <br />Surface noise measurements on the 100 foot grid demonstrated the collector to produce <br />approximately 57 dBA at the 100 foot distance, in a sound reflective environment. <br /> <br />If you should have any questions regarding this inspection report, please feel free to contact me, <br />or in my absence, Mike Holmquist at 783-9581. <br /> <br />This report is intended to assist Artistic Finishes, Inc. in the evaluation and determination of noise <br />exposures related to the operation of dust collection equipment and community noise produced <br />from this operation. It is, however, not comprehensive. Hazard and risk conditions not within <br />Qur scope of work or not observed or noted during our visits are not implied to be safe. Further, <br />there may exist operational conditions that were not observed during our monitoring period. Our <br />reports are for assistance only and are not conclusive. No liability is assumed by reason of this <br />report of the inspection on which it is based as it is only advisory in nature and the finial decisions <br />must be made by AFI. <br /> <br /> <br />c@ <br /> <br />Artistic Finishes Inc. <br />1726 Terrace Drive, Roseville, Mn. <br />Dust Collector Noise Monitoring <br /> <br />3 <br /> <br />Integrated Los. Control, Inc. · (612) 783.9581 <br />