03-14-2018 Council Packet - Laserfiche WebLink

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2 of 2 10062 Flanders Court NE – Blaine, MN 55449 – Ph: (763) 780-0450 Fax (763) 780-0452 5. The elevation of the existing boulevard inlet off Rice Street is shown as 941.0 on the plans, but the inputs for Pond P2 in the existing conditions model indicate an elevation of 941.40. This discrepancy should be addressed. 6. The time of concentration paths are only shown for P1 and P3 on the proposed drainage exhibit. The sheet flow for these areas do not match the grades shown on the grading plan and should be revised. Routes should be added for the other areas and Subcatchment P4 in particular appears to have an incorrect time of concentration. 7. The 8-inch outlet device for Pond 2P:FILT2 should be revised to reflect the correct pipe material. Landscape Plan 1. The slopes of the pond above the normal water level of the proposed pond are called out to be seeded with MnDOT seed mix 33-262. This is a seed mix consisting of 42% native grasses, 1% forbes (native flowering plants), and 57% oat cover crop. Establishment of these native mixes, especially the forbes portion can take several years. Due to the relatively small area of the pond slopes plug plantings or large plants should be used to supplement the seeding to make the pond more of an amenity to the site. The Watershed provides assistance with planting plans of this nature and would likely assist the Owner with a planting design. General Comments 1. There is over one acre of disturbance for the project and therefore a Ramsey Washington Metro Watershed District and National Pollution Discharge Elimination System (NPDES) permit will need to be obtained. Documentation of the permit approvals will be required prior to any work. 2. Permits should be provided for the impacts in the County right-of-way along Rice Street. 3. A copy of the stormwater pond maintenance agreement with the Watershed should be submitted for City review prior to execution to ensure the inclusion of maintenance of plantings in the pond area or a separate maintenance agreement with the City shall be required. At this time there are comments that have not been addressed to the satisfaction of staff. We have given the Developer until 8:00 a.m. Tuesday, March 13th to submit information before a final recommendation is made. If new information is received a supplemental report will be given to the Council as an addition to the agenda packet prior to the Wednesday meeting. If no additional information is received by the deadline, staff would recommend tabling the development until the comments are addressed. Please contact me if you have any questions regarding the above information at (763) 780-0450 ext. 3.