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<br />002"2J8 <br /> <br />Woodward-Clyde - Jim Irish, Chief Engineer; Roy Spitzer, Survey Chief <br /> <br />W-C's job is to determine the adequacy of the rock at proposed dam <br />sites to hold dams and reservoirs. Exploration work is about half <br />done (core drilling); no engineering rock-related problems have <br />been found yet. <br /> <br />Earthquake potential is minor to moderate; there is, however, <br />growing evidence that the Rocky Mountain area is just in a quiet <br />era of earthquake activity. <br /> <br />Cross Mountain Site <br />Limestone (420 million yrs) underlain with sandstone (500 million <br />yrs); layered. <br />Broken/porous openings in rocks at layer joints may result in <br />"madera te to minor" 'vater loss. <br />West Cross Mountain Fault (multitude thousand feet uplift) shows <br />no recent movement (several million years). <br /> <br />Juniper Site <br />Rocks about 100 million years younger than Cross Mountain site; <br />no evidence that they wouldn't hold a reservior. <br />Early stage of drilling now - only 1 of about 8 holes completed. <br />USBR had looked at another site farther east in the canyon - <br />an area where "rock is' quite fractured.. <br /> <br />PROJECT 'OPERATION AND HYDROLOGY <br /> <br />EDAW <br /> <br />Two issues related to project operation are being studied: <br />1) Effects of flow changes on whitewater recreation. <br />2) Effects of flow changes on endangered fish (ERT-ECI). <br /> <br />Rafting: <br />high <br /> <br />Possibility to expand rafting season at the expense <br />spring flows. <br /> <br />of <br /> <br />Endangered Fish: Concerned with effects of flow changes on sediment <br />load, river channel form, and temperature; felt lowered water <br />temperature associated with most reservoirs could be mitigated <br />by drawing from reservoir surface via multi-level outlet (did <br />not indicate any concern that high spring flows themselves may <br />be critical for reproduction downstream - SJP). <br /> <br />~ <br /> <br />No further comments <br /> <br />3 <br />