Agenda - Council - 08/25/2020 - Laserfiche WebLink

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When last meeting with the property owner on February 13, 2020, the owner requested that the City pay for the required repairs to their patio. On May 4, 2020, a claim was filed by the City with the League of Minnesota Cites Insurance Trust. At this time it is not known whether LMCIT will pay the claim or not. This drainage improvement project is proposed to be completed this fall to help avoid any future damages claims by the property owner. Based on the current bid environment Staff anticipates receiving good quotes. Upon Council approval, Staff proposes to solicit quotes from several local grading contractors with a quote submittal deadline of 10 a.m. on Thursday, September loth. On September 15th the Public Works Committee can then review quotes and provide a recommendation to the City Council for award of a construction contract on September 22nd. Estimated construction costs for this project total $23,000 and are based on final plans as prepared by City Staff. Construction staking is proposed to be provided by a consultant at an estimated maximum cost of $3,000. A proposal for construction staking will be presented to the City Council at the time Staff requests approval of a construction contract to the contractor submitting the lowest quote on September 22nd. All project costs are proposed to be split evenly between the Stormwater Management and Stormwater Utility Funds. This project is anticipated to take 5 to 10 days to complete, with substantial completion specified for October 23, 2020. Final payment will be issued in 2021 after turf is established and all work is approved. Recommendation: Staff recommends adopting Resolution #20-176 approving plans and authorizing Requests for Quotes for 5751 164th Lane Drainage Improvements, Improvement Project #19-17. On August 18, 2020, the Public Works Committee discussed this project and ultimately recommended City Council authorization to solicit Requests for Quotes for 5751 164th Lane Drainage Improvements, Improvement Project #19-17. However, the Public Works Committee asked is Staff had explored the option of simply grading a berm between the front yard of 5751 164th Lane and the back of the drainage ditch to prevent stormwater runoff from draining onto this property. The City Engineer indicated he would discuss this with the design engineer and would report back prior to requesting Council approval of a construction contract, which is currently anticipated to occur on September 22nd. Below is a summary of the design options that were explored by Staff while preparing plans, as well as Staff s findings and recommendations for each. Option 1: Build berm north of 164th Lane at back edge of ROW This option would be to construct a berm at the back edge of the right-of-way (ROW) generally between the driveway and the high point in the ditch to the west. The controlling factors are the high point in the ditch approximately 40 feet west (875.1) and the edge of the driveway 25 feet to the east (875.6). The berm could be built up to an elevation of (875.1) at the ROW. The culvert under 164 th Lane and the culvert under the driveway are slightly filled in and below existing ground in the low area of (874.2). Findings/Recommendations - In large storm events an area approximately 65-feet by 15-feet would sill with water to a depth of 0.9-feet (11-inches), and during spring thaws this is likely to freeze. Either way, the potential would exist for runoff to overtop the berm and flow across the yard as it does today. Water would also stand in the ditch for significant periods of time making it difficult for the property owner to mow the ditch. Staff does not recommend this option. Option 2: Re -grade the ditch on the north side of 164th Lane, build berm on north side of 164th Lane at the ROW This option was the preferred option, however, when potholing Northern Natural Gas (NNG) pipes we only found 3 feet of cover existing. By law, 3 feet of cover is required over these pipes. To re -grade the ditch would require approximately 1-foot of cut at the more eastern of the two NNG pipes which cross the ditch.