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Benson Brothers Red Shale Quarry Vibration Characterization Study Plan <br />also be present to ensure all measurements and monitoring locations aze appropriate for the <br />purposes of this study. <br />All vibration measurements will be digitally recorded and event files will be downloaded <br />from instruments, backed up and forwazded to Gordon Revey for analysis. Field monitoring <br />logs accurately documenting the time, distance, and type of equipment measured for all <br />event records will be kept by Ms. Nation during the time of the measurements. To <br />acknowledge the accuracy of the measurement logs, they will be signed by Ms. Nation and <br />representatives of CDMG. <br />Based on the results of the monitoring work at the Austin Quarry and other similaz <br />monitoring of motions made by mechanical equipment, it is extremely likely that all needed <br />data will be collected in two days time because it will become cleaz that data from <br />subsequent measurements is repetitive. The decision to terminate data collection should be <br />made when observers representing CDMG acknowledge that measurements at varying <br />distances aze becoming repetitive and aze not exceeding prior collected peak values. <br />Measurement Locations: Wherever possible, measurements will be made on hazd exposed <br />sandstone outcrops located at or neaz the bluff or ridge. The condition of ground and GPS <br />location coordinates of all monitoring points will be noted in field notes and provided in the <br />study report. In order to establish a range of monitoring distances needed to prepaze <br />attenuation curves, instruments may be moved to points located 15 to 350 feet away from <br />operating equipment. <br />Data Evaluation and Renortin>?: REVEY Associates, Inc. (RAI) will analyze all data and <br />develop site attenuation curves for Bound motions generated by all equipment sources. <br />Standazd least squares regression and statistical methods will be used for this work. All data <br />and regression analysis and statistical evaluation tools will be provided with no chazge to <br />Engineers representing CDMG to facilitate an independent data analysis to confirm the <br />accuracy of reported results. A report of findings containing all measurement data and site <br />curves will be prepazed and delivered within two weeks after data collection work is <br />completed. _ _.. .. __ <br />Respectfully submitted, <br />~- ~;- <br />Gordon Revey <br />REVEY Associates, Inc. Page 2 of 2 6/1/06 <br />