Professional Engineer Michael Zoccola, Army Corps of Engineers Nashville District Civil Design Branch chief and dam safety officer, talks about the technical paper he prepared with preliminary analysis of potential vibration Impact to Old Hickory Lock & Dam from proposed quarry operations during a media availability at Old Hickory Dam in Old Hickory, Tenn., March 29, 2016. The dam is maintained and operated by the Nashville District. (USACE photo by Leon Roberts)

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Keywords: brig., cumberland, dam, district, division, gen., great, hickory, kaiser, lakes, lrd, nashville, ohio, quarry, richard, river, rock, tennessee, usace