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<br />0"" ,,,.", <br />U ,1. i. V /J <br /> <br />,~''''' <br />:-~-il <br />'::~€1Y <br /> <br />i~~j <br /> <br />the initial substantiating data that depicts this condition. <br />4. Photographic Coverage, <br />In September 1974 photographic monitoring of Bripge Creek Canyon by low <br />elevation flight was performed using a Hass1eblad camera and 70 mm <br />Infrared color film. The purpose is to obtain an inventory of existing <br />vegetation. Later flights will be made to eompare vegetation following <br />repeated cycles of the reservoir elevation. <br />5. Moisture Rock Samples <br />Two sets of sealed rock samples taken from Rainbow Bridge have been <br />analyzed in the Bureau of Reclamation E&R Center Labs in Denver for : <br />moisture content. One sampled group was obtained on August 30, 1974, after <br />the reservoir had peaked and been under the bridge for 60 days. The <br />other group was obtained on Narch26, 1974, before the reservoir, at <br />elevation 3650 feet, reached the axis. The results of this initial <br />determination indicate that the reservoir influence on moisture content <br /> <br />in the rock which forms the bridge is nil. The claim that moisture will <br />be induced from the reservoir and harm the bridge rock is not substantiated <br />by thi s test. <br />6. Rock Mechanics <br /> <br />Detailed laboratory determination of the physical properties of the Navajo <br />and Kayenta formation rock from the subject area has been completed by <br />the Bureau of Reclamation Engineering & Research Laboratories in Denver. <br />These test results are contained in 149 pages of data. This data will <br />be used for future comparisons and correlations with other related data <br />that is being obtained in the monitoring program. <br /> <br />~~~~~ <br />:l <br />'t <br />~~~ <br /> <br />~~~ <br /> <br />'r <br /> <br />W'~i! <br /> <br />~,,,, <br /> <br />I <br />""""$1 <br />a'~{;~;;'~'" <br />~~t~ <br />,~~~~ <br />;~~,"J" <br />.-1.",:-"$: <br />~< <br />~ <br />,., <br /> <br />~SfI:~ <br />~:~:: <br />4 t~~~ <br />.wt._~~~~ <br /> <br />'0 v,. <br />f!i;:'-:: <br />.~?~~~>", <br />