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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />alternative solutions were investigated in order to choose a means <br />of providing the 3.0' freeboard at the street crossings: <br /> <br />a) Increasing the grade of the street crossings to match the grade <br />of the new top of the levee, resulting in a fill of 3.7 to 4.6 <br />feet at the crossings. <br /> <br />b) Increasing the street grade to match the elevation of the 100 <br />year water surface, providing a closure structure consisting of <br />concrete retaining walls and wooden stop logs 3.0 feet in <br />hei ght. <br /> <br />c) Increasing the street grade to 1.0 feet above the 100 year <br />water surface el evati on, providi ng a closure structure <br />consisting of concrete refraining walls and wooden stop logs <br />2.0 feet in height. <br /> <br />4. <br /> <br />Recommendations <br /> <br />,--'C". <br /> <br />WRC recommends that alternative b) be used for the street crossings. <br />In addition, the levee in the vicinity of 6th Street will be <br />re located approximately 100 feet east of its present 1 ocat i on so as <br />to not interfere with the grading of adjacent private property <br />driveways. The preliminary details of this option are shown on <br />Sheet 1 of 4. <br /> <br />This alternative will result in the least disturbance to the sight <br />distance and minimize the street reconstruction. <br /> <br />As previously mentioned, a more refined profile HEC-2 run will be <br />required prior to preparing construction plans for the <br />rehabilitation of the levee system. Significant changes may lead to <br />more economical designs. <br /> <br />-21- <br />