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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />II <br />I <br />I <br />I <br /> <br />contract documents can be readily prepared for a project bid <br />and a construction award. <br /> <br />SURFACE AND SUB-SURFACE FLOODING CHARACTERISTICS <br /> <br />The Town of Crook and the immediate vicinity experiences <br />flooding and ground water problems nearly every year. The area <br />experienced major flooding in 1965 and 1973. The high spring <br />snowmelt runoffs of 1983 and 1984 caused severe erosion. <br />sedimentation. and high groundwater problems. The Town has <br />been identified by Federal Emergency Management Agency - See <br />Plate 2 - to be entirely within the 100-year inundation zone. <br />The Colorado Department of Health has placed the town on notice <br />that their sewage lagoons are overloaded. This condition is <br />due mainly to the infiltration of foreign waters. These <br />foreign waters enter the system at service connections and <br />service line connections. Utility Management Services. Inc. of <br />Breckenridge, Colorado, the town's consultant. in August 1988 <br />evaluated the town's sewer lines and determined that the <br />increase sewage loading is due mainly to the infiltration of <br />water due to the high underground water conditions. <br /> <br />PLAN FORMULATION <br /> <br />In the formulation of a plan-of-improvement for the study <br />reach the following concerns were considered by the CWCB. <br /> <br />o Reducing underground water problems <br /> <br />o Reducing infiltration of foreign waters into the sewer <br />system <br /> <br />o Extending the flood projection of the South Platte Levee <br />System <br /> <br />o Developing a multi-use surface and sub-surface drainage <br />project. <br /> <br />The selected plan-of-improvement will consist of a 10.000 <br />foot drainage channel located along the 1933 channel <br />alignment. The channel will be constructed in cooperation with <br />the Colorado Department of Highways and Logan County. The <br />excavated channel materials will be used for the construction <br />of a section of the flood protection levee. Details of the <br />channel and levee system are shown on plates 3 and 4. <br /> <br />PROJECT COSTS <br /> <br />Project costs were estimated for the North Drainage Channel <br />and South Platte Levee Extension by the unit cost method. Unit <br />costs schedules were compiled from similar project which were <br />constructed in 1987 and 1988 under the Davis-Bacon Provisions. <br />The quantities were computed from field surveys and inspections <br />by the CWCB. <br /> <br />-3- <br />