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02-04-1994 11~29AM FROP1 YENTER COMPRIJIES TO 7904850 P.02 ~ 6,r,rie,r N 3. WESTERN VIBRATION SPEC:IALISTS, INC. P,O. Box 581 • Morrison, co 80465 • (303) 697-9646 • fax (303) 697-1905 I February 4, 1994 Mr. Don Weddell Miners, Inc. 9137 East Mineral Circle Englewood, Colo. 50112 Dear Don: As per our conversation this mornin!; February 4, 1994 I am sending some information on my background':. I am a degreed Geologist (Colorado State University) and have worked in geology and geophysics for sever,' years. For two and one half years I worked at the U.S. Geological Survey, while there I worked on a uranium drill rig, and developed structure contour and isopach maps for Formations in the San Juan Basir+.. My next three and a half years were spent doing seismii interpretation for oil and gas for small to medium sized Oil and Cas companies from across the country. The past two years have bee, with Western Vibration Specialists doing vibration monitorir;g for pile driving, construction, demolition and blasting. Since starting work with Western 1%ibr~tion, I have worked with several companies for vibration monitoring some examples would be: Huntingdon/Chen Northern, SEMA Construction, Tarco, Inc., Controlled Demolition Incorporated, and Jefferson County Public Works Department. For Huntingdon/Chen Northern we monitored the vibrations from passing trains along the ~~anta Fa Railroad tracks near Sedalia, Colorado Aprii 1993. Fo,r SEMA Construction we monitored pile driving operations for a.i overpass for the new Denver International Airport, January 19;3 and March 1993. For Tarco, Inc., I monitored blast ~-ibrations'Por house foundations at the willow Springs Housing Development, Jti;ne 1943. We have worked with Controlled Demolition Incorporated on~such notable projects as the demolition of the Montgomery Wards building February 1993, and the Grain Elevator near the 20th Street Bridge, Fall of 1942. For Jefferson County Public Works, I have moniiored for quarry blasting at the Green Valley Quarry, and have monit;>red for road cut blasts in Evergreen May 1992 and January 1994. i We are currently working on getting a quarry permit application for the proposed quarry on Sou h Table Mountain. To do this we had to complete blast vibration r,onitoririg for vibration attenuation characteristics and natural fl'equencies of the latite rock formation. W'e also preformed bl~~.st vibration tests to determine the rimrock natural frequency- ai:d stability.