#09 - Oak Land Middle School Minor Subdvision & CUP

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PAGE 2 of 3 STORMWATER MANAGEMENT 1. The site plan is subject to a storm water management plan (SWMP) meeting State, Valley Branch Watershed District (VBWD) and City rules. Storm water facilities proposed as part of the site plan to meet State and VBWD permitting requirements must be constructed in accordance to City Engineering Design Standards dated January 2022, even though the facilities will remain privately owned. 2. All stormwater facilities and BMPs will be privately owned and maintained by the school district. The school district will be required to provide a Stormwater Maintenance and Easement Agreement in accordance with the City’s standard form of agreement. 3. All storm water basins must be placed in easements in accordance with the Stormwater Maintenance and Easement Agreement. The easements must fully incorporate the 100‐year HWL, 10‐foot maintenance bench and all maintenance access roads. Maintenance access roads meeting City standards must be provided for all storm water facilities and structures. 4. The SWMP will be required to verify that rate control and volume control requirements are met for all points of discharge from the site. The existing and proposed drainage exhibits must clearly show and label all points of discharge from the site, including any required public improvements and turn lanes. The SWMP rate control tables must reference each discharge location independently and combined. 5. Overland emergency overflows (EOF) or outlets will be required as part of the site plan and the EOFs and EOF flow routes must be protected by easement. 6. Minimum floor elevations must be at least 2 feet higher than the adjacent 100‐year HWL elevation. Also, all low opening elevations for all buildings must be at least 1‐ft higher than any adjacent emergency overflow elevation (EOF). All building low floor and low opening elevations must be listed on the site and grading plans. 7. All localized low points must be protected within a drainage easement. MUNICIPAL WATER SUPPLY AND PUBLIC SANITARY SEWER 1. The proposed site is located within the City designated Municipal Urban Service Area (MUSA) for sanitary sewer service. Due to the plans to expand the school use, the extension of public watermain and sanitary sewer should be implemented as part of the improvements. A feasibility report has been authorized to identify the scope of improvements and costs necessary to connect the Oak‐Land Middle School to City water and sewer. 2. Connection to City water and sewer would be made available by extending a 12‐inch diameter trunk watermain and 8‐inch diameter gravity sanitary sewer pipe from the intersection of Palmer Drive and 10th Street, and extend these utilities easterly along 10th Street to the northern District property line. For the sanitary sewer, additional lift station and forcemain improvements will need to be completed to accommodate the added sewer flow. The District would then be responsible for paying their prorated costs for these City installed improvements and then connecting to the City water and sewer stubs and to route additional infrastructure internal to the site. 3. The District’s internal site improvements must include water and sewer connection to the Oak‐Land Middle school, the placement of fire hydrants and water system valves internal to the site as determined by the Lake Elmo Public Works Director and Fire Department, and the extension of a 12‐inch diameter trunk watermain from the District’s northern property line and stubbed to the District’s southern property line for future development to the south. 4. The internal site sanitary sewer would be a privately District owned sewer service. The internal watermain serving all hydrants and stubbing to the southerly property would remain City owned. Minimum 30‐foot easements centered over the pipe/hydrant will be required when not located within the public right‐of‐ way. Easements must be free from all encroachments, including retaining walls, trees, fences, small/dry utilities, or storm water management BMPs. Easements must be dedicated to the City as part of the project. 5. Watermain oversizing costs apply to watermain pipe sizes over and above the minimum 8‐inch diameter design standard. Reimbursement of oversize costs are addressed as part of the site improvement agreement.