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F.valuaiion of Proposed Blasting at the ACA Riprap Quany near Buena Vista, CU <br />scaled by the square turn nl'rhargP arioM to rrPate a cinnlr ticrrnrlent variable called Scaled <br />Distance (U,). 1~he charge weight term (W) is the maximum weight of explosive firing withal <br />any S-millisecond time period throuehout the' duration of a blast event. The relationship between <br />Peak Pnrti~~lP Velnrity (PPV) an~3 Scaled l~i.stance (I7q) fnllrnvc_ <br />m <br />PPS = KC °%~~ or PPv = K~Ds ~in Equation 2.1 <br />Where: PPV =Peak Panicle Velocity (irt/sec) <br />K attd m =site attenuation constants <br />DS =Scaled Distance (ft/lh° `) <br />D =Distance to nearest structure (ft) <br />W = T~faximum charge weight per delay (Ib) <br />Site-specific attenuation constants. K and m, can be determined by performing a regression <br />analysis of multiple Peak Particle Velocity (PPV) and D; da[a valttrs from test bloats. Rcgressiu[t <br />of the logarithms of plotted data pairs produces an equation with a slope equal to m and Y- <br />intercept equal to K. When plotted in log-log scale, regression curves have a negative slope with <br />values of (rn~ usually around -1.6. As .reported by Orittrd (1990), auQ ahuwn il' Figwc 2.3, Y- <br />intercept or (K) values usually tall bet.veen 60~ and 24. <br />RL• V EY .4ssocia[es, lnc, Pn~e 4 ]uly 2001 <br />