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999 303-429-1996 TOLL FREE USA 800-233181 vibra-tech engineers incorporated CON$UITANiS TO THE NIHING, OU~N$VING. CON$TpUCTIOH AND E%PI.O$IVE USING IHDUSfXIE$ 8120 NORTH SHE RIDAN BOULEVARD, SUITE 304 A, WESTMINSTER, COLORADO 80003 April 7, 1986 Mr. .Terry White, Zoning Administrator LARIMER COUNTY PLANNING DEPARTMENT P.O. Box 1190 Fort Collins, Colorado 30522 REFERENCE: Masonville Quarries Dear Mr. White: JUN p 8 1998 DiVjsipq D/1yi~efab 8 Oeoiu9Y ~ ~ ~ECEI~'L~ ^~ ~~ AP~ ~ ~ ]~^ ~~ In response to our discussion over the telephone the other day, I am enclosing some general brochures alnd information that will describe some of our company's blast vibration control methods, and typical instrumentation. Cdtten these specially designed blasting seismographs are used, a record of blast vibrations can be assembled with information on distance from blast, and weight of explosive detonated per delay period. This basic information will not only provide a record of blast vibrations that can be referred to should a complaint situation arise, but will also provide the means by which blast vibrations can be predicted prior to blasting, and therefore controlled. In addition [o this material, I am also enclosing extract copies from the Regulations of the Office of Surface Mining, U.S. Department o[ the Interior. While these regulations are mandatory only in respect to surface coal operations, they are at the same time conservative, protective of property and realistic, permitting as they do reasonable blasting operations at an obsoLute minimum or risk. Having been extensively re-written since they were challenged in the D.C. Court of Appeals, they are now in a form Chat will withstand considerable legal attack. My own feeling is that adoption of the vibration standard of the OSM Regulations for quarry operations provides the public with complete protection against the adverse effects of blasting, provides the regulating body with regulations that will stand up against challenge, and allows the quarry operator to conduct safe and efficient blasting without being overly restricted. It is worthy of note that under very restrictive regulations, a quarry operator may tend to, or be forced to, underload his shots to the extent that not only does he not achieve proper breakage - and has to repeat the blasting -but that the vibrations are in fact significantly hiE;her and more damaging and annoying than if the shot had been properly loaded, when proper breakage absorbed the excess vibrations.