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Evaluation of Vibration at the Benson Brothers Red Shale Quarry <br />• <br />r. <br />0.2 <br />USBM RI 8507 Safe PPV Curves -Dashed Lines <br />50.8 rrrr~s <br />(20 in/s) <br />~~ . <br />0.75 in/s cp°~~~ j~ <br />~~g~PlasteDr & Lath ..................... <br />0.501t~s ! ' <br />_ i <br />~ . . <br />i ~ ~ <br />I <br />/ ~ <br />~ Measured <br />~~ PPV Range ~ <br />~, <br />I i <br />0.1 <br />1 <br />2 4 6 8 10 20 30 40 60 80 100 <br />FREQUENCY, Hz <br />Figure 2 -- USBM "Safe Level" vibration curve from RI 8507 <br />• <br />10 <br />s <br />s <br />C a <br />F- <br />U 2 <br />O <br />J <br />W <br />1 <br />W 0.8 <br />J <br />() o.s <br />0.4 <br />Q <br />Vibration Data Analysis <br />The highest vibration reading occurred on August 12, 2008and likely was caused when <br />the battery was checked for power. Since the peak measured intensity of construction- <br />activity ground vibration was 0.34 inches per second (in/s), which is less than the 0.5 in/s <br />safe level recommended by the USBM, it is reasonable to conclude that any vibration <br />caused by the heavy equipment will not register levels of any significance at the rock <br />bluffs or near any properties. <br />Respectfully submitted, <br />Sara J. Nation <br />PreSeisTek, Inc. <br />PreSeisTek, Inc. <br />Page 4 of 4 <br />8/28/2008 <br />