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~~~N <br />FUEIS <br />ASSOCW70N <br />lNC. <br />7Le Naliorra! <br />Fue( Sxpply <br />CaQrraJrrr <br />III IIIIIIIIIIIIIIII <br />March 5, 1993 <br />Mr. Harry Ranney <br />Reclamation Specialist <br />Office of Mined Land Reclamation <br />1313 Sherman St., Room 215 <br />Denver, CO 80202 <br />Dear Mr. Ranney: <br />MAR <br />RE~E~~~O <br /> <br />o~~l 91993 <br />srpl7 p/ hl~nel3is ~ Vep/p9Y <br />Please find enclosed copies of the following reports prepared by Vibra-Tech Engineers. <br />1. Ground Motion Attenuation from Blasting. This report analyzes the test blasting results <br />and recommends a conservative scale distance factor of 18:04 in order to keep the <br />peak particle velocity within 1 inch per second. <br />2. Blast Design. This report recommends blast designs including drilling patterns, <br />explosive type, delays, blast hole loading and stemming. <br />I have recently submitted a technical revision application for a revised blast plan based upon vbra- <br />Tech's recommendations. <br />If you have any questions, please call. <br />Sincerely, <br />.- <br />Murari P. Shrestha, P.E. <br />Assistant Manager of Engineering <br />MS:Igp <br />ce: Don Deardorff w/o <br />Lance Wade w/o <br />Suite #305 <br />405 Urban Street <br />Lakewood, Colorado 80228 <br />Telephone 303/988-9626 <br />Telecopier ;03/986-8147 <br />