06-25-2018 Council Packet - Laserfiche WebLink

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AGENDA ITEM Item No.: 10 Item Description: Long Lake Ravine Stabilization Date: June 25, 2018 Presenter: Adam T. Edwards, P.E. Agenda Consent Agenda Public Works Director/City Engineer Section: 1. Purpose. The purpose of this action item is to gain approval to proceed with the stabilization project for the Long Lake Ravine. 2. Background. Over the years erosion has led to the development of a ravine with in Summit Beach Park leading into Long Lake from Old Long Lake Road. The existing ravine is approximately 500' long that has eroded to a depth of approximately 10 feet. This erosion contributes to increased sediment and phosphorus loads and reduced dissolved oxygen in runoff, and is extremely detrimental to water quality of Long Lake. The stabilization of this ravine has been on the City's Surface Water Management Plan (SWMP) from 2011. Due to difficult access the project has yet to be undertaken. Phase 2 of the CSAH 122 turn back project provides an ideal opportunity to access the ravine and complete the necessary work. The road project includes a rebuilding of the drainage structures including the culvert that directly feed the ravine. Since the road project will already be impacting the slopes immediately above the ravine, accessing the ravine with the necessary equipment will cause minimal additional impacts if the two projects are synchronized. These improvements will greatly reduce total suspended solids and phosphorus loads to Long Lake. Council approved design and engineering in October 2017. 3. Project Scope. To repair the ravine, the proposed design will include a stable cross-section, installation of limestone grade control weirs with plunge pools, and planting of deep rooting native vegetation. 4. Cost. The City received two quotes. The low quote was from Schneider Excavating for $92,297.50. Bolton and meck has provided a proposal for construction services for NTE $11,500. Contractor Quote Schneider Excavating $ 92,297.50 Park Construction $ 207,323.05 5. Funding. This project will be funded through the Stormwater Fund. The Capital Improvement Plan (CIP) has $100,000 budgeted for the project. The stormwater fund has projected EOY 2018 balance of $1,410,101. 6. Staff Recommendation. I recommend that council accept the quote from Schneider Excavating with the intent of executing the project in coordination with the CSAH 112 Phase 2 project. COUNCIL ACTION REQUESTED Motion accept the quote from Schneider Excavating from $92,297.50 for the Lang Lake Ravine stabilization project and accept the proposal from Bolton and Menk for Construction services NTE 11,500. Exhibits A. Project Area Diagram Prepared By: References A. 2011 Surface Water Management Plan Reviewed By: A -- Approved By: -TV