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1 <br />1 <br />1 <br />1 <br />EXECUTIVE SUMMARY <br />A probabilistic seismic hazazd analysis of the Henderson tailing dam in north-central <br />Colorado has been performed. Seismic sources considered in the analysis included nine faults <br />such as the northern segment of the Williams Fork Mountains fault and the Skylark fault neaz <br />the Henderson tailing dam and a background areal source (Colorado Rock}' Mountains <br />seismic source zone). Empirical peak acceleration attenuation relationships for stiff soil sites <br />were used in the analysis. For typical return periods of 500 and 1,000 yeazs, the probabilistic <br />peak accelerations were 0.12 g and 0.19 g for the Henderson tailing dam. <br />H:\COMRAC[\234561.DUPii <br />ii <br />M0J09951609 <br />