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<br />TABLE OF CONTENTS <br />North Fork Valley Seismic Network - Second Quarter 2008 .....................................................................1 <br />Summary .............................................................................................................................. 1 <br />Introduction .......................................................................................................................... I <br />Network Operations ............................................................................................................. I <br />Data Processing .................................................................................................................... 2 <br />Identification of Events ............................................................................................ 2 <br />Location Methodology ............................................................................................. 3 <br />Magnitude Estimation .............................................................................................. 4 <br />Results .................................................................................................................................. 4 <br />Mining Progress ....................................................................................................... 4 <br />Seismic Event Locations .......................................................................................... 4 <br />Seismic Event Magnitudes ....................................................................................... 4 <br />Recorded Peak Ground Accelerations ..................................................................... 5 <br />Acknowledgments ................................................................................................................ 6 <br />References ............................................................................................................................ 6 <br />• <br />n <br />U <br />Tables <br />1 Seismograph Stations of the North Fork Valley Seismic Network <br />2 Velocity Model Used in Locating Seismic Events <br />3 Event Locations and Maximum Recorded PGAs <br />Figures <br />1 Seismic Station Locations, Permit Areas, and Mine Location Map <br />2 Relocated Seismicity, 1 April to 30 June 2008 <br />3 PGA Values for Q3 and Q7 2007 and Ql and Q2 2008 Shown With McGarr and Fletcher <br />(2005) Attenuation Relationships <br />UM WAx_wcfs\PROJECTSWorth Fork-Bowie\Quarterly reports\2008 Q2\Q2 2008_BRL.doc\OAK 1