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<br />C. F. & I. CANON CITY QUARRY REPORT <br />CONCLUSION <br />Vibrations at all five locations were detected and recorded. The results <br />are tabulated and included as a separate page in this report. The maxiRwn <br />particle velocity occurred at the Murphy Residence - 0.03 inches/second. <br />Current, most stringent regulations, specify one inch second as a limit <br />that could cause structural damage. A limit of two inches/second was <br />commn in 1977 and preceding years. <br />PARTICLE VELOCITY CURVES <br />Two curves have been prepared and are included in this report. It is <br />eRQhasized that the two curves are based on five points only - a very <br />minimal number which provide a trend only. However, the curves will give <br />a good indication of velocities expected from specific blast charges. <br />Additional points may be obtained from monitoring fLture blasts so as to <br />obtain a more accurate and meaningful set of curves. <br />Enclosed with the report are copies showing the velocities obtained at each <br />instrument station. Actual velocities obtained are clearly visible. <br />