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C()IMENTARV SHEET 14 OF 45 STATtON 1572 TO STATION 1632 REACH 4 CCtlMENTARY SHEET 14{F45 STATION 1572 TO STATION 1632 REACH 4 (Continued) This reach includes a Public Service Company generating plant as well as commerical, industrial, and residential land uses. There is a flood area of approximately 75 acres on the left bank oused by inadequate capacity downstream of Evans Avenue and the Evans Avenue bridge, and bench from Station 1572 to 1576. Finally, the improvements to the Evans Avenue bridge should be made, including the addition of the bay on the left side. The additional recOOl1lended improvements could be imple_ mented whenever funds or the opportunity exist. The reCOfTlllended plan in this reach is limited structural improvements. These include lowering the channel bottom by approximately 2 feet from Stations 1572 to 1,598. It maybe necessary to use heavy equipment to scrape the bedrock in order to lower the channel. Frorn Station 1572 to Station 1576 the left bank should be moved to within 10 feet of the road dlldreplacedbyavertical wall along the road 20 feet hiqh and a bench 50 feet wide at about the 2-year flood level whiCh would incrpase channel capacity and provide wildlife habitat. The Evans Avenuebridqeshouldbe improved by constructin9 M additional 30-foot bay on the left side of the bridge. On the right side of the bridge the existing trail should be moved adjacent to the right abutment and the material between the trdil and the rher replaced by a vertical retdining wall. Between Stations 1586 and 1593 the right bank should be moved back and covered with grass. Beh,een Station 1613 and 1620 the rubble and concrete on the right bank beinq used for erosion protection shuld be replaced byriprap. The Public Service Company diversion darn at dpproximat~ly Station 1626 should be repair~d and ~ boat chute added. The floodplain management approach in this reach js to enforce floodplain management regulations in th~ identified flood area and encourage the pur- chase of flood 1nsurance unt il the improvem~nts recomrn~nded can be imple- mented. COST ESTIMATE SHEET 14 Of 45 SOUTH PLATTE RIVER STATlON1572+00TOSTATlON1632+00 CONSTRUCTION The first priority in this reach is the Channel lowering between Stations 1572 and 1598. The next priority is the construct10n of the v~rtical wall Drainage improvement costs Street crossing costs Utility relocation costs Total construct 10n co~ t~ $603,421 2~2,700 855,621 256,686 I $1.112,307 $14,597 l I I Engineering and contingencies (30% of total construction co~ts) Property dcquisition TOTAL IMPROVEMENT COSTS Operationandlolaintenance