08-24-2016 Council Packet - Laserfiche WebLink

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Page 1 of 2 To: Honorable Mayor and City Council From: Lee Elfering, City Engineer Date: August 19, 2016 RE: Ryan Industrial Park Road Improvements Proposed Project Street Improvements Earlier this month the City Council was provided a copy of a memo that was sent to the property owners in the Ryan Industrial Park for proposed changes to the road improvements project that was approved at the Public Hearing. The determination that any fly ash material removed from the industrial park would be impacted soil and require special disposal at a landfill significantly increased the costs to reinforce/reconstruct a section of the roadway with the overburden aggregate generated as part of the reclamation process. The additional cost made the overall project less cost-effective and staff recommended that only the reclamation and repaving be completed on Spruce Street and Ryan Lane. Ryan Drive is proposed to be removed from the project. No calls or feedback have been received from any property owners in the industrial park so we would recommend approving the proposed changes. Storm Water/Flooding In recent months there have been complaints of flooding issues in the Industrial Park. Specifically in the back yard areas of the properties that abut the St. Paul Water property to the west (see attached exhibit). The stormwater drainage in this area has been an issue in the past, but there is a belief from the property owners that the frequency of the problem has increased and the area impacted has become worse in the last few years. The City did complete an extension of the City’s bike trail on the St. Paul Water property in this area in 2014. As part of that project a storm pipe was installed under the trail just south of Woodlyn Avenue and fill was placed south of the railroad tracks to achieve the at grade crossing. Property owners were concerned that the low area in the Waterworks property was filled and that more water was now directed to the Industrial Park. We reviewed the impacts the grading had on the low area east of the trail and there was very minor filling below the elevations of the adjacent properties. The extent was very limited and we do not feel that it would have caused significant changes to the drainage. Based on those findings we have been reviewing the larger area to determine if there have been other factors or changes that have negatively affected the drainage in the area. In general, nearly all of the drainage east of the Canadian Pacific railroad tracks between the Burlington Northern railroad tracks and South Owasso Boulevard is ultimately conveyed to the Owasso Basin east of the industrial park through a combination of ditch systems with some limited areas of piping. As part of the larger review we are reviewing the ditch conditions, their ability to convey flow and any