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I ! k <br />Eagle Mountain Major Gravel Operations <br />APPENDIX 1 <br />BASIC SOUND PRINCIPLES <br />High Level HSE Review <br />Difference between <br />levels in dB (A Number of dB (A) to be added to (or <br />subtracted from the higher level <br />0 3.0 <br />1 2.5 <br />2 2.1 <br />3 1.8 <br />4 1.5 <br />5 1.2 <br />6 1.0 <br />7 0.8 <br />8 0.6 <br />9 0.5 <br />10 0.4 <br />12 0.3 <br />14 0.2 <br />16 0.1 <br />Source: Noise Control, A Guide for Workers and Employers, U.S. Department of Labor, <br />Occupational Safety and Health Administration <br />REFERENCES <br />1. American National Standards Institute S1.4 <br />2. American National Standards Institute SL I1 <br />3. Noise Control, A Guide For Workers and Employers, U.S. Department ofLabor <br />4. Noise Procedure Specification Publication No. 140, The Engineering Equipment and <br />Materials Users Association (EEMUA) <br />5. ISO 9613 Part 1 <br />6 http://www.npl.co.uk/acoustics/techguides/absorption/ <br />7. http://www.kayelaby.npl.co.uk/general_physics/2_4/2_4_l.html <br />8. Effect ofprocessing cement to concrete on hexavalent chromium levels. Turk K, Rietschel <br />R L. <br />-7-