09/08/2021 P&Z Packet - Laserfiche WebLink

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Ms.Katie Larsen 9/1/2021 Page 2 Comments: 1. Plans shall reference the current version of the City Standard Specifications found on the City website and all details shall be updated to City Standard Details as applicable. 2. Per the Shoreland Ordinance there shall not be any facilities or construction within the 150' shoreland impact zone. 3. Applicant shall provide a permit or written authorization from Great River Energy and UPA to work within their easements. 4. Additional geotech data required: a. The applicant is proposing homes in old borrow pit areas. Building pad locations shall be evaluated for bearing capacity and per building code. b. Percolation tests shall be provided for filtration basins. • Grading &Stormwater Management The Lake Amelia Woods Plat will require site grading for the proposed house pads, the proposed driveways, storm water facilities, and other site grading. Elevations for the proposed house pads were provided on the grading plan for each property. The minimum elevations for the house pads are dependent on the groundwater elevation, the ordinary high water level (OWHL) of the Amelia Lake, and the design of the stormwater facilities. The existing parcels are within the Amelia Resource Management Unit. The applicant is proposing approximately 2.22 acres of new impervious surface for the proposed driveways and proposed house pads at this time. The proposed project is within the Vadnais Lake Area Water Management Organization (VLAWMO). Stormwater BMPs are needed to meet City stormwater and shoreland requirements. The applicant is proposing to meet City stormwater requirements by constructing several stormwater basins and infiltration basins. The design of the ponds shall meet the requirements of Table 6 of the City's Stormwater Management ordinance. Comments: 1. The building pad Low Floor Elevations (LFE's) must be 4 feet above the highest known groundwater level. 2. The LIFE elevation of future homes shall not be lower than the HWL elevations of the adjacent storm basins. 3. For future maintenance purposes, the basins shall be located on the property for which they are treating impervious surface. 4. Filtration basins shall be located outside of the high vulnerability area shown in the Drinking Water Supply Management Area, see attached map. 5. Applicant to show the location of turf maintenance access to basins. 6. Plans shall show rip rap or alternative stabilization for drain tile underdrain outlets. • Water Supply The existing properties are identified as part of the Stage 3 Planned Service Area in the 2040 Comprehensive Plan. There is not currently any existing water main along 20th Avenue (CSAH 54) in this area. The 2040 Comprehensive Plan does identify a future 8" watermain loop in this area. The proposed homes will need to install wells. Lake Amelia Woods Preliminary Plat Engineering Review