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<br />currently being considered for use as habitat. A site reconnaissance survey was also performed <br />at Thunder Ranch, formerly referred to as Escalante Ranch. Thunder Ranch habitat design is <br />being reevaluated to reflect the recent water quality analyses and to investigate changes in <br />channel morphology. <br /> <br />Task I b. Data collection: Survey and data collection for the CDOT site were initiated in <br />2002. Data collection included river cross-section surveys and onsite survey shots for use in <br />developing topographic mapping. A number of discharge measurements were also collected. <br />Additional discharge measurements at high-flows will be required in FY 2003. Hydrographic <br />surveys were also performed at Thunder Ranch in the spring of2002. Work included <br />approximately 500 topographic and hydrographic survey grade GPS measurements and resurvey <br />of existing cross sections established in 1993. The survey included detailing potential inlet and <br />outlet areas, utilities and structures, levees and roads, and a general survey of the floodable area. <br />Additional hydrographic survey of the seeps at Thunder Ranch may be required depending on <br />habitat design. <br /> <br />Task lc. Analyses: Hydrologic analysis was initiated for the CDOT site in January <br />2002. Topographic mapping and a floodability analysis also began in 2002 but are currently on <br />hold until further direction is given. <br /> <br />Analyses for Thunder Ranch were conducted to evaluate floodability under new habitat <br />design considerations. Analyses included evaluation of the river cross-sections for stability as <br />compared to past surveys (FLO Engineering 1993) and a hydraulic analysis to investigate <br />alternative inflow locations and to compare water surface elevations with past studies. The site <br />plan for Thunder Ranch was updated using topographic data collected in 2002. <br /> <br />Hydraulic analyses were also conducted for Grand Junction Pipe (GJP), to evaluate <br />modified designs proposed for this site <br /> <br />Final reports were prepared for Walter Walker (WW), Butch Craig (BC) and Grand <br />Junction Pipe (GJP) sites for use in NEP A. <br /> <br />Task 2. Design and engineering: <br /> <br />Design and engineering in 2002 included civil design, details and specifications, permit <br />preparation, and contractor coordination. Plans and specifications were developed for the BC <br />and GJP sites starting in January 2002. Preparation, revisions, and Regional General Permit 057, <br />issued under the authorities of Section 404 ofthe Clean Water Act, were also completed for <br />WW, GlP and Be. <br /> <br />A meeting was attended in Denver to review GJP and discuss Thunder Ranch. Efforts <br />this year also included coordination with Dave Soker and Terry Ayer on the survey of Thunder <br />Ranch. <br /> <br />C-6 hyd page 3 <br />