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<br />- <br /> <br />~ <br /> <br />. <br />I <br />i <br /> <br />~ost Estimates <br /> <br />Conceptual designs were prepared for the proposed improvements in sufficient detail to determine and <br />document constrUction quantities and subsequently, a planning cost estimate. Topographic mapping at <br />a scale of ] "=800' was used as base mapping for conceptual designs. Criteria used for preparing <br />quantities were as follows: <br /> <br />.J <br />II <br /> <br />. <br /> <br />Channel Sections <br />. Trapezoidal section <br />. Size using normal depth or HEC-2 <br />. 2: I sideslopes for the maj or channel improvements at the UPRR and HWY 6 <br />. 3: 1 sideslopes for the low flow channel downstream of HWY 6 <br /> <br />II <br /> <br />. <br /> <br />Drop Structures <br />. Concrete cutoff wall for the entire width of the charmel <br />. 5 feet of Type M Riprap upstream of the cutoff wall and 25 feet of Type H riprap <br />downstream of the cutoff wall <br /> <br />I , <br /> <br />, ! <br /> <br />. <br /> <br />Standard Levees <br />. ] 0 feet top width <br />. 3: I sideslopes <br />. 3 feet minimum of freeboard <br /> <br />. Ring Levees <br />. 10 feet top width <br />.. 3: 1 sideslopes on the channel side <br />.. 5: 1 sideslopes on the landward side <br />.. 3 feet minimum of freeboard <br /> <br />. FloodwalIs <br />.. J foot thick <br />. Footing meeting CDOT standard drawings <br />.. 3 feet of cover over footings <br />.. 3 feet minimum of freeboard <br />. Road Raises <br />.. 24 feet wide pavement section <br />. 3: 1 sideslopes <br />. Maximum 5% longitudinal slope <br /> <br />. Widening of HWY 6 Bridge <br />.. Width of each bridge is 38 feet <br />. Older timber bridge would be replaced <br />. 20' x 8' RCBs would be added to the southbound bridge as an alternative to widening the <br />bridge <br /> <br />40 <br />