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<br />R. J. Irish <br />Consulting Engineering <br />Geologist, Inc. <br />during the life of the planned dam. Without more deli nitive information then we have now about <br />the seismicity of the northern section of the Rio Grande Rift, we would suggest that a PPV of U. I g <br />would be a more realistic, appropriately conservative approach for dam design. Moreover, e <br />concrete gravity dam, such as the planned roller compacted concrete structure, is relatively <br />resistant to damage by earthquake ground motions. On the other hand, we believe a concrete arch <br />dam would be a poor choice for this site because that type of dam does not withstand the impact of <br />earthquake energy very well. <br />The second factor in seismic risk is ground rupture along a fault that underlies a structure. <br />As no faults were discovered at the damsite, that potential risk should be essentially zero <br />C .d~~~~ ,~r~ <br />~~ <br />Robt. James l ri <br />Consulting Engineering Geologist <br />8 <br />