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• Status: No change since Feb.`95 CIP list. • Date identified as a CIP: (Feb. `95, Mar. `96, Nov. `97, July `98) 6 of 23- 34` Ave. Complex - Sundial Rd. To Amazon Dr. W. o PWM Contact: Jim McLaughlin o PWE Contact: Peggy Keppler Current Problem: Drainage system originating at City limits along both Sundial and W 40th Ave. reverts between piped and open drainage until finally entering piped system to the Amazon near W 34th and Olive ( #51239). A number of 24 ", 27 ", and 30" diameter pipe segments along the mid section of this system downstream from larger 33" and 36" pipe segments appear to restrict capacity of the system to handle additional flows from increased development. Example: 36" pipe originating at grated manhole behind 384 Delwood ( #50138) reverts to a 24" pipe segment at Delwood ( #50136 to 50135), then back to 36" pipe until outletting to open drainage just north of W 37th Ave. ( #50115). It then reenters the 24" pipe behind W 35th Pl. ( #50107), outlets to open drainage at Frederick ( #51204), then reenters 33" pipe west of Olive ( #51239) that is shortly restricted to a 27" segment along W 34th Ave. ( #51271 to 51285). Pipe system alternates between 30" and 36" segments along E 33rd Ave. until it outlets to the Amazon. The area cited in the above example, the mid and lower section of this drainage complex, appears to harbor the potential for creating surcharging and/or localized flooding conditions at the various diameter restrictions and inlet choke points as additional flows are introduced to the system from upstream development. • Recommended Solution: Conduct flow analysis of entire system based on the projected full development of the drainage basin. Study feasibility of reconstructing sections and/or pipe segments of the existing system that do not meet design standards necessary to adequately service flows based on full basin development. Acquire necessary easement from new development to allow maintenance access to the grated manhole inlet to the piped system behind 384 Delwood St. ( #50138). Also, enclose the short section of open drainage to pipe between 36" outlet just north of W 37th Ave. ( #50115) and inlet to 24" pipe leading to Frederick St. ( #50107) to eliminate potential maintenance problems associated with this inlet. Reconstruct under -sized system components as appropriate. • Status: No change since `97 CIP List. Engineering began research for project design. Because of the scope of this project, Engineering recommended the services of a consultant. • Date identified as a CIP: (Feb. `95, Mar. `96, Nov. `97, July `98) 7 of 23- 2889, 2915 Van Ave. - North off Bailey Lane o PWM Contact: Richard Zucker o PWE Contact: Therese Walch Current Problem:Inlet in front of 2889 & 2915 Van Ave. Inlet ( #68225) on the north side of Van is a non- standard standpipe inlet with a small grate. The inlet is stubbed into an 8" (approx.) pipe which, according to the grid map, runs north and south a short distance into the properties on the north and south side of the street and daylights at outlet #60128 and #60129. During heavy storm events, this inlet routinely backs up and floods this portion of the street. Maintenance has not been able to locate the two outlets of the pipe. The City has no easement to the pipe and it is assumed that it is either blocked, collapsed, or has been removed. • Recommended Solution: Replace inlet with a standard catch basin. Connect catch basin to a piped system which would run west on Van and install a manhole at the intersection of Van and the dedicated right of way of South Street (currently a greenway with a bicycle - pedestrian path). A pipe would then run north up the South Street right of way and connect to existing manhole #61146. Include installation of curb on north side 98 C1P 11/98 bne