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<br />o. <br /> <br />,. <br /> <br />The existinginlcts and pipe in Bennett Avenue west of First Street are <br />adequate and should he left undisturbed. <br /> <br />b. <br /> <br />The existing outlet pipe from the inlet at First Street and Dennett <br />Avenue should be connected to the new storm sewer pipe which will <br />begin at First Street and run easterly to Second Street. It is <br />recommended that this pipe he a 42-inch RCP and approximately 550 <br />lineal feet will be required. <br /> <br />14. <br /> <br />15. <br /> <br />c. <br /> <br />The new 36-inch RCP storm sewer around the courthouse should be <br />connected to the new 42-inch Rep in Bennet! Avenue at First Street. <br /> <br />d. <br /> <br />The existing inlet~ on Bennett Avenue hctwcen First Street and Second <br />Street should be replaced with a 15-foot long curb opening inlet. <br /> <br />16. <br /> <br />Replace tlJe grated inlets at each corner of the Bennett Avenue and <br />Second Street intersection willi radial inlets with a minimum curb <br />opening length of to-feel. <br /> <br />should be installed in the swale on the west side of Second Street a tMasonk <br /> <br />Avenue. <br /> <br />Existing structure no. 33 (12-inch collapsed CMP) has no capacity and <br />therdorei,inadequatetoconveyrunofffromthelO-yeardesignslOrm. It is <br />recommended ruat this culvert he replaced with an IS-inch CMP with a <br />minimum of2 feet of headwater. <br /> <br />Existing structure no. 99 (12-ineh crushed eMP) has no capacity and therefore <br />isinadequutetoconveyrunoffassoeiatedwiththelo-yeardesignstorm. Itis <br />recommended that this culvert be replaced with a 30-inch CMP witlJ a <br />minimum headwater depth of 4 feet. <br /> <br />Existingstrueture no. 93 (l2-inchcrushed CMP) has no capacity and there fore <br />is inadequate to convey runoff associated with the ID-year design storm. It is <br />recommended that this culvert be replaced with a 24-inch CMP with a <br />minimum headwater depth of3 feet. <br /> <br />D. Upper Cripple Creek <br /> <br />f. 250 lineal feet of 18-ineh RCP storm ,ewer should be extended <br />westerly in Bennell Avenue from Second Street for connection of <br />improvements associated with the Bennett Avenue streetscape project. <br /> <br />Upper Cripple Creek is defined as those portions of the upper Cripple Creek <br />watershed which are above the confluence of Cripple Creek with the Main Street <br />Trihulary. This confhlel1ce is approximately 600 feet east of the intersection of Fifth <br />Street am.! Carr Avo::nue. Upper Cripple Creek now, throllgh lhe northeasterly <br />portion of fhe city's corporate limits. Cripple Creek fin"", thrnllgh a clearl)' defined, <br />undeveloped channel. Several large diameter cOl1duits have been installed in Cripple <br />Crcck at road cmssings. Several of the large diameter conduits are undersized and <br />need to he upgraded. The drainage basins in Upper Cripple Creek also include <br />,everal small diameter road crossingculvcrts. all ofwhkhappeartuhcadcqllately <br />sized:;ntlin:lcceptablecondition. <br /> <br />The recommendations discussed in Item 11 above result in 3 new pipes <br />intersecting in Bennett Avenue at Second Street. These pipes should be <br />combined in a junction structure and a new 48.inch RCP outfall line with a <br />slope of approximately 5% should be installed from this manhole sOl1!herly <br />untilitcro,ses Warren Avenue and discharges into the existing drainageway. <br />A shallow drainageswale shall hc constructcd oncach side of Second Street <br />(Highway 67) between Dennett Avenue and Warren Avenue and a new inlet <br /> <br />13. <br /> <br />\11.11 <br /> <br />VI-12 <br />