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CIP 3 -NORTH B STREET HEADWALL Schedule: 2017 Estimated Cost: $400,000 Surface water from forested areas to the northeast of the City and development within the County enters the stormwater system north of the intersection of North B Street and Utah Avenue. Currently, the system downstream of the headwatl crosses several private properties before entering public stormwater conveyance that is located entirely within rights-of-way. This project will install a new headwall and 1,370 feet of 24-inch-diameter pipe. The project will provide capacity for the 10-year peak flow of between 10 and 28 cfs as well as reroute the stormwater conveyance system to locate it entirely within the City right-of-way. CIP 4-NORTH 1ST STREET HEADWALL Schedule: 2017 Estimated Cost: $270,000 A large surface water flow from forested areas to the north of the City and development within the County enters the stormwater system to the east of the intersection of North 1st Street and West Nevada Avenue Alley. The pipe downstream of the headwall crosses a private property. This proje'ct will install a new headwall and 650 feet of 36-inch-diameter pipe to provide capacity for the 10-year peak flow of 168 cfs and will reroute the stormwater conveyance system to locate it entirely within the City right-of-way. According to the hydraulic model the capacity of the downstream system to which CIPs 2 and 5 connect should be increased to convey modeled flows from the upstream basins. Improvement of the downstream system is a part of CIP 10. Completion of CIP 10 is recommended either in conjunction with or prior to construction of CIPs 2 and 5 . CIP 5 -NORTH C STREET HEADWALL Schedule: 2017 Estimated Cost: $190,000 Surface water from forested areas to the east of the City and development within the County enters the stormwater system south of the intersection of North C Street and Arizona Avenue. The pipe downstream of the headwall does not currently have capacity for the lO-year peak flow of 8.9 cfs. This project will install a new headwall and 760 feet of 12 -inch-diameter pipe between the headwall and CIP 3 in North A Street. CIP 6 -REROUTE NORTH 3RD STREET Schedule : 2017 Estimated Cost: $930,000 Surface water from forested areas to the west of the City and development in the County enters the stormwater system west ofthe intersection of North 4th Street and Washington Avenue. Much of the conveyance system downstream ofthis intersection is both undersized and located on private property. City staff recommends that a new creek entrance and new 24-inch-diameter pipe be installed in the City park to the alley between West Washington Avenue and West Pennsylvania Avenue, to connect to the existing system. New pipe would be installed from the alley between West Pennsylvania Avenue and West Dakota Avenue within City right-of-way or City-owned property to the storm sewer trunk line. This project will install 500 feet of 24-inch, 200 feet of 36-inch, 155 feet of 42-inch, 415 feet of 48-inch and 900 feet of 54-inch-diameter pipe . The system will provide capacity for the lO-year peak flow of 178 cfs and will reroute storm water conveyance to locate it within the City right-of-way. Approximately half of the area tributary to this project is from outside the City limits. June 15, 2016