04-12-2021 Council Packet - Laserfiche WebLink

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Preliminary Plat Application Long Bridge Page 2 H:\ORNO\_Surface Water Management\MS4 Administration\MCM-5_Post-Construction Stormwater Management\2_Site Plan Reviews\Long Bridge\Long Bridge_PrePlatReview_2021-03-01.docx h. An impervious surface exhibit must be provided to verify areas match the calculations. The exhibit must indicate existing and proposed impervious surfaces. i. Curb, gutter, and a spillway must be provided on the east side of the road at the entrance to direct runoff to the basin, or the Drainage Area Map and calculations should be revised to indicate runoff from this area bypassing Basin #4. j. A stormwater management plan outlining how the proposed improvements will meet all requirements must be submitted for review prior to Preliminary Plat approval to ensure adequate siting is available for required facilities. 2. The weir for Wetland A and the culvert under the driveway for Long Lake Creek must be indicated on the plan. 3. Final Plans must include the following: a. Grading, Drainage, and Erosion Control Plan b. Street Construction Plan c. Utility Plan d. Landscape and Restoration Plan e. SWPPP meeting NPDES requirements 4. The applicant will be required to obtain Minnehaha Creek Watershed District (MCWD) approval and permitting. An existing access route to the Wetland A weir is located on the northeast side of the wetland. This access route should be confirmed as adequate with MCWD. A copy of any approvals or permits required must be submitted prior to Final Plat approval. 5. The applicant will be required to obtain a General Construction Permit (NPDES) to discharge stormwater associated with construction activity since more than 1 acre will be disturbed. A copy of the permit must be submitted prior to any land disturbing activity. 6. The applicant will be required to obtain Hennepin County approval and permitting for connection to County Road 6. A copy of any approvals or permits required must be submitted prior to Final Plat approval. 7. A variance will be required to allow a driveway approach serving more than two lots. The driveway for Lot 2 also serves 1305 and 1405 Sixth Avenue North. In addition, an Access Easement should be established over the driveway across Lot 2 and recorded with the Final Plat per the City’s approval process. 8. Since this parcel is in the Metropolitan Urban Service Area (MUSA), the lots are eligible for connection to the municipal sanitary sewer system. The most likely connection point would be on the south side via a low-pressure force main system. Additional discussion with the City regarding sanitary service should be undertaken to determine viability of municipal service. 9. The applicant will be required to submit a Maintenance Agreement for all stormwater management structures and facilities. The agreement must define maintenance responsibilities following completion of project, specify types and frequencies of inspection and maintenance activities, designate who will conduct inspection and maintenance activities, and outline reporting requirements. The Agreement will be recorded with the County per the City’s approval process. 10. Drainage and Utility Easements msut be provided as follows: a. Over all sanitary forcemain. b. Over all stormwater management facilities used to meet regulatory requirements, including access routes. c. Over all wetlands, creeks, and buffers, including existing access route to the Wetland A weir on northeast side of wetland). d. All swales, structures, and piping providing drainage for multiple properties (including the weir for Wetland A and the culvert for Long Lake Creek under the shared driveway). e. 5’ along all side lot lines, unless adjacent to Development boundary. f. 10’ along all front lot lines, rear lot lines, and adjacent to Development boundary.