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. II - PROJECT DESCRIPTION 2-01. Genera 1. The recommended p Ian as presented in this Phase II des ign memorandum consists of a levee on both banks with channel improvements along Fountain Creek to provide protection from floods up to the 200-year recurrence flood. 2-02. West Levee. The west levee, located between the Denver and Rio Grande Western Railroad tracks and Interstate 25, begins at the intersection of 11th Street and Fountain Creek at Sta 1+73W and terminates at the intersection of 6th Street and Fountain Creek at Sta 14+50W. At the beginning point, a concrete flood wall extending 390 feet will be provided due to the restrictive amount of space between the railroad tracks and the Interstate 25 overpass at 13th Street. At Sta 5+63W the flood wall transitions, to a soil cement levee section. The soil cement levee, 337 feet long, consists of a landside and streamside slopes of 1 vertical (V) on 1.5 horizontal (H), a 10 foot wide top and a 3 foot parapet wall. The soil cement levee transitions into an earth levee at Sta 9+00W. The earth levee extends 550 feet downstream to a termination point at 6th Street and Interstate 25. The levee alignment and details are shown on Plate 3. . 2-03. Interior drainage on the West Levee consists of a drop inlet located at Sta 6+00W and an extension of an existing 24" dia. conduit at sta l2+75W. The drop inlet intercepts flows trapped between the west levee and the concrete barrier situated in the median of Interstate 25. The flows are collected by 2-48" dia. RCP's which proceed to a headwall equipped with flap gates and discharge into Fountain Creek. A 24" dia. drainage structure located at Sta l2+75W extends through the west levee earth levee section and fitted with a flap gate on the streamside. . j 2-04. East Levee. The east levee begins 500 feet north of 12th Street on the east side of Fountain Creek at Sta 0+00 and proceeds downstream roughly paralleling the existing bank where the levee terminates at the Missouri and Pacific Railroad bridge abutment at Sta 90+00. The east levee is comprised of earth and soil cement sections. The earth levee section is similar to that on the west side. The earth levee sections begins at Sta 0+00 and extends to Sta 18+20. At Sta 18+20 the earth levee transitions to a soil cement levee with 1 vertical on 1.5 horizontal side slopes and a 10 foot top width. The soil cement levee continues from Sta 18+30 to a point just north of the 8th street bridge, a distance of 500 feet. A 3-foot high concrete parapet wall will be placed along the top of the soil cement levee to the upstream side of the 8th street for the required freeboard. Slope protection for the embankment under the 8th street bridge is provided by existing riprap,considered stable for the design velocities. The Trailhead Park is located south of the 8th street bridge. From the downstream side of the bridge abutment, the existing bank will be excavated to a lV:2.5H side slope for a distance of 80 feet to the upstream end of the park. Within the area of the park the existing bank will be excavated On a slope varying from IV:2.5H to a maximum of lV:5H to lV:l.5H at tbe downstream edge of the park (Sta 28+30). Slope protection for tbe bank is provided by an 18" thick riprap blanket. Within the park area the riprap will be covered by 1 foot of top soil. The parapet wall is continued from the downstream side of the 8th street bridge to the upstream edge of the park along the levee. From this point the wall is set back from the bank following II-I