Agenda - Council - 06/11/2024 - Laserfiche WebLink

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stormwater runoff from the 3 8-acre catchment to meet current LRRWMO design standards. The City proposes to provide all necessary rate control, water quality, and volume retention improvements in compliance with LRRWMO criteria as part of the proposed project. The existing pond that receives stormwater runoff from this catchment is undersized and does not meet the rate control and water quality treatment requirements per current LRRWMO stormwater standards. This catchment includes several undeveloped parcels West of Xkimo Street and North of 142nd Avenue, including the Lightbridge Academy development parcel. Since this 3 8-acre catchment is located within the City of Ramsey's East Drinking Water Supply Management Area (DWSMA) where infiltration of stormwater is prohibited, the pond will need to be lined, which increases costs. The LRRWMO Management Plan describes/defines sites, such as those located within a DWSMA, as infeasible or inappropriate for infiltration and identifies other scenarios for the permittee to investigate. Volume retention requirements can either be provided on -site as part of the Rivers Bend Regional Stormwater Improvements by utilizing filtration practices as allowed by LRRWMO stormwater standards, or off -site in a regional infiltration basin located outside the East DWSMA. City staff has discussed various aspects of this project with LRRWMO and MPCA staff, including potential wetland impacts, options for meeting volume retention requirements, and how the timing of this project can be coordinated with the Lightbridge Academy development construction to ensure adequate stormwater runoff treatment can be provided during construction of both projects. Staff has been coordinating the construction schedule of the City's stormwater improvements project with the Lightbridge Academy development construction schedule to address concerns raised by the LRRWMO. Lightbridge Academy's engineer has prepared and submitted a phased construction plan for consideration with their LRRWMO permit approval on June 20th. Lightbridge Academy plans to construct their building first with minimal disturbance to the rest of the site while the Rivers Bend Regional Stormwater Improvements project is designed and bid. Lightbridge Academy would then complete site improvements including impervious surface improvements during construction of the Rivers Bend Regional Stormwater Management Improvements. City staff is unable to prepare final plans and specifications for these improvements in time to bid and construct the improvements this Fall due to staff workload. Staff therefore proposes to hire Bolton & Menk to prepare plans and specifications for these improvements due to Bolton & Menk's familiarity with the City's stormwater infrastructure and the LRRWMO stormwater design requirements. In addition, Bolton & Menk recently completed the wetland delineation report, which included some surveying so they have a start on some of the design efforts needed. Attached is the design services proposal from Bolton & Menk identifying various professional design services that will be provided by Bolton & Menk for the total amount of $83,900. This is to be considered as a not -to -exceed amount, exclusive of the Geotechnical Services estimate of $12,500 since this work will be performed by a subconsultant yet to be selected. In summary, Bolton & Menk will provide engineering design services including, but not limited to, coordinating project investigations, topographic survey, project design and permitting services, preparation of project documents including final plans and specifications, and administering bids. The attached proposal does not include construction related services. If/when Council is requested to accept bids and award a construction contract, a separate proposal for construction related services would be presented for Council approval. Project Timelines The following preliminary project schedule is in included in Bolton & Menk's proposal. June 12, 2024 Notice to Proceed / Order Borings June 21, 2024 Survey Complete July 19, 2024 80% Design and Calcs Complete / Submit to LRRWMO