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<br /> <br /> <br />December 23,2004 <br /> <br />Memo to: <br /> <br />The File <br /> <br />From: <br /> <br />Scott Spisak <br /> <br />Re: Pavement Recycle Cmshing Vibration Monitoring <br /> <br />On November 30,2004, we engaged American Engineering testing, Inc. (A.E.T.) to <br />perform vibration monitoring ofIntex Corporation's cmshing equipment that was <br />recycling pavement at our Johnson Pit at 12500 Rich Valley Blvd. in Rosemount. The <br />monitoring was performed on December 2, 2004. <br /> <br />There were no other operations being conducted on the property that day. Intex <br />equipment included a CAT 988F Wheel Loader, ajaw type primary cmsher, a cone type <br />secondary cmsher with vibratory screens, a trailer enclosed diesel generator and several <br />belt conveyors to transfer material from the primary cmsher, through the secondary <br />crusher onto the stockpile. <br /> <br />The test results (see report attached) show that at a distance of 100 feet, vibrations would <br />have to double or triple to even register above 0.1 PPV (in/s) on the U.S. Bureau of <br />Mines Alternative Blasting Level Criteria Table, Vibrations would have to increase at <br />least ten times to reach levels that may damage plaster buildings and about thirteen times <br />to reach levels that may damage dry wall. <br /> <br />In more than 15 years of pavement recycling in urban areas, we have had no complaints <br />about vibration. <br />