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i5 i <br />~~~ Southwestern Portland Cement <br />Blasting Related Ground Vibration <br />SHB AGRA Project E93-7038 <br />Page 4 <br />REFERENCES <br />Langefors,U., Kihlstrom, B., and Westerberg, H., 1958, "Ground Vibrations from Blasting", <br />Water Power, February, 1958. <br />Nicholls, H. R., Johnson, C.F., and Duvall, W.I.,1971, "Blasting Vibrations and their Effects <br />on Structures", Bureau of Mines Bulletin 656, U.S. Government Printing Office. <br />SHB AGRA, Inc., ]993, "Blast Vibration Analysis, Dowe Flats Project, Boulder County, <br />Colorado", unpublished consultant's report to Southwestern Portland Cement dated May 24, <br />1993. <br />L^ AGRA <br />Earth & Envimnmenta/ Gmup <br />