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Marty Fisher <br />From: Dan Wellman <dan.wellman@mntotaldefense.com> <br />Sent: Thursday, December 05, 2013 2:39 PM <br />To: Marty Fisher <br />Subject: Fwd: Noise Levels <br />Marty, <br />Here is the Sound Transmission Class numbers from the range we are "leaning" towards <br />Thanks - Dan <br />Forwarded message <br />From: Ken <Ken@shootingrangellc.com> <br />Date: Wed, Dec 4, 2013 at 9:30 AM <br />Subject: Noise Levels <br />To: Dan Wellman<dan.wellman@mntotaldefense.com> <br />Good Morning Dan, <br />Here is the info on noise levels. <br />NIOSH — they say at peak hours the DB levels are at 155 DB to 168 DB. Ear plugs reduce the sound by 24 DB <br />and the ear muffs reduce the sound by 26 DB. They also say the noise from a weapon cannot exceed 140 DB. <br />With the ear plugs and ear muffs the DB will be well below the 140 DB inside. <br />With a typical construction of 8" CMU solid grout filled, wood truss, R50 insulation in the ceiling you should <br />be around 65 to 75 DB outside during firing. <br />The only way to measure the DB levels at the curb would have to be done with a meter. There are a lot of things <br />that can reduce the noise level. Tree's, bushes, is your range behind your retail space. Normally the noise from <br />the street is louder the range. <br />I hope this helps Dan. <br />Have a Great Day Dan <br />Ken Cadam <br />3885 Rockbottom St. <br />N. Las Vegas, Nevada 89030 <br />ken ! shootingrangellc. com <br />i <br />