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lititvut Of Report Number 12-160 11. TION Agenda Section VI-7 the city that works for you Council Meeting Date July 10, 2012 REQUEST FOR COUNCIL CONSIDERATION ITEM DESCRIPTION: APPROVAL OF PLANS AND SPECIFICATIONS AND AUTHORIZATION TO ADVERTISE FOR BIDS FOR CITY PROJECT 12-9,PHASE I FREEDOM PARK FLOOD MITIGATION IMPROVEMENTS. DEPARTMENT HEAD'S APPROVAL: (.04.1,) CITY MANAGER'S APPROVAL: 45& 71i /Z— No comments to supplement this report _ C m nts attached Recommendation: To approve the plans and specifications and authorize staff to advertise for bids for City Project 12-9,Phase 1 Freedom Park Flood Mitigation Improvements. Legislative History: On August 23, 2011, City Council authorized staff to enter into a contract with WSB & Associates for engineering services for the preparation of our Surface Water Management Plan (SWMP) and a July 2011 Flood Report. The Flood Report was accepted at the April 24, 2012 City Council Meeting and the City Council authorized City Project 12-9, Phase 1 Freedom Park Flood Mitigation Improvements. Plans have been prepared and staff is seeking approval to authorize for bids on July 6, 2012. An advertisement for bids will be placed in the local newspaper and bids will be received on August 7, 2012. This will enable Council to approve the bids on August 14, 2012 and begin construction as soon as late August. Financial Impact: The total estimated project cost is $397,600. Explanation: As a part of the Flood Report recently completed, several improvements were recommended to increase the flood protection available in the Freedom Park Neighborhood. The first phase of these improvements will expand the pond in Freedom Park into areas south and west of the existing ball field. This will increase flood storage available for high intensity rainfall events and reduce the probability of flooding at downstream locations. In addition, the first phase includes construction of additional catch basins along Pike Lake Drive at Fredeen Court and 12th Street. These catch basins will provide additional capacity to allow surface water to enter storm sewer under these intersections, which can reduce the potential for flooding at these intersections. To allow for the additional capacity collected by the new catch basins, the 30" corrugated metal storm sewer pipe discharging to Pike Lake(from Pike Lake Drive and 12th Street)will be removed and replaced with at 54"concrete pipe. It is anticipated that this project will generate 12,500 cubic yards of material from the excavation of the surge basin. To save costs, instead of trucking this material offsite, some or all of this material may be disposed of in the New Brighton Exchange(NBE)where Ashland Oil recently completed their remediation project of the former NW Refinery site. However, any soil that is brought onto the NBE that will be used as clean soil cover needs to be tested for environmental quality because it is a MPCA regulated cleanup site. This testing was conducted June 29, 2012 and we are expecting there will be no environmental concerns. The results should be available by mid- July. In the end, this could be a significant savings to the City. We expect to save $50,000 to $100,000 by hauling the excavated material to the NBE. The savings will be twofold— 1) a future project in the NBE will not have to import as much fill, and 2) we may realize cheaper excavation costs with this proposed project since the material will only need to be trucked a short distance within the City. There is an organic topsoil stockpile along the west boundary of Tract 2 within the NBE generated from previous excavations. This project includes relocating all 16,760 cubic yards of this stockpile. It will be placed as cover soil on top of the Ashland Oil clean-up site. Costs and Funding: This project will be funded from the Stormwater Improvement Fund and the New Brighton