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Department Approval: Y�1� � Item Description: REQUEST FOR COUNCIL ACTION 1�Ianager Reviewed: �� Zimmerman La1ce/TH 36 Storm Sewer Study DATE: 12/11/00 ITEM NO.: F— 3 Agenda Section: Reports/Recommendations Background: Zimmerman Lake is located north of Hwy 36, between Mn/ DOT Water's Edge and Cedarhohn Golf Course. This basin receives the storm water runoff for an area one half mile on either side of Snelling Avenue to the southern City limits, appro�mately 425 acres. The storm water is discharged into the Lake through a large 6-foot diameter pipe that goes underneath Hwy 36 at the old State Farm building. Over the last 30 years the e�sting Mn/DOT ditch has flooded the lower levels of the State Farm building 4 or 5 times during larger rain events. In 1998, Wellington Management purchased the State Farm building and brought the issue of flooding to the attention of the City. A preliminary hydrologic review revealed that the e�ting 6-foot pipe under TH36 causes a constriction in the system resulting in periodic flooding of the old State Farm building. It has been suggested that additional capacity is needed under TH 36. Mn/DOT, however has expressed concern that this solution may raise the flood level of Zimmerman Lake and threaten Mn/DOTs Waters Edge building located on the west shore of the lake. In order to more accurately predict the effects of additional stormwater capacity under TH36, a new more sophisticated stromwater study must be completed. This study will cost $15,000 to complete. It is unclear who is ultimately responsible for this flooding situation. The City of Roseville has controlled the development of the watershed and the construction of the majority of the storm sewer. Mn/DOT designed and installed the suspect culvert under TH 36 and has made modifications to the storm sewer system in Snelling Avenue and TH 36. The properiy owner has purchased a building that e�ibits clear signs of past flooding and that was modified to provide additional flood protection -- all without the knowledge of Roseville or Mn/DOT. While no pariy is willing to accept full responsibility for the eventual solution, all wish to proceed with the proposed study in an effort to move this issue closer to resolution. Accordingly, Mn/DOT has agreed to fund 1/3 ($5,000) of the $15,000 study cost. The property owner, Wellington Management, has also agreed to contribute 1/3 ($5,000). It is proposed that the City of Roseville fund the remaining 1/3 ($5,000). If approved by the City Council, staff will hire an engineering consultant to complete the work and draft agreements necessary to share funding. Policy Implications: Roseville's e�sting storm sewer assessment policy states that properties will only be assessed once for storm sewer improvements. The Roseville Storm Drainage Fund was established to provide for ongoing stormwater improvements in lieu of assessments. Financial implications: The City's share of this proposed study, $5,000 is not part of the approved 2000 or proposed 2001 budget. It is recommended that the Council amend the 2000 budget by $5,000 with funding to come from the Stormwater Utility Fund RECOI�II�IENDED COUNCIL ACTION: Motion to amend the 2000 Budget by $5,000 for the Zimmerman LakeJTH36 storm sewer study with funding to come from the Storm Drainage Fund. Prepared by. Karl Keel