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?sac* Wisconsin Department of Transportation <br /> %HllitO DIVISION OF HIGHWAYS <br /> Truax Center <br /> 3502 Kinsman Blvd. <br /> Madison.WI 53704-2507 <br /> April.4,1996 <br /> To Whom It May Concern: <br /> Current criteria developed by the U. S. Bureau of mines and adopted by Wisconsin DILHR has <br /> in our personal experience proven to be a reasonable and effective guideline for the protection of <br /> public welfare and property during blasting and construction. This standard provides protection <br /> for homes and public buildings and allows efficient mining procedures and construction methods_ <br /> More restrictive limits are not substantiated by research and would impose an undue burden on <br /> the mining and construction, industries. <br /> Currently two inches per second peak particle velocity is the industry standard for underground <br /> pressurized pipe line. More recent research by the U. S. Bureau of Mines and the Indiana DNR <br /> have shown that ground vibration of 5 inches per second are acceptable for pressurized pipe line <br /> (see enclosure). <br /> Sincerely, <br /> (264.0154- Perylau.,4(2_ <br /> Robert Patenaude, P.E. <br /> Geophysical Engineer <br /> RWP:k00392 <br /> [nvI People who care, creating quality transportation-today and tomorrow <br />