08/08/2007 P&Z Packet - Laserfiche WebLink

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• • Moon Marsh page 7 There will be easements that extend 10' around the wetlands. The house pads on two lots were revised to provide more use of the yard around the house without encroaching on the easements (L2 B2 and L1 B3). In addition, the western border of Lots 1 & 2, Block 2, were moved eastward to increase the area within the outlot versus land within the lots. Removing this area from individual lot ownership is one way to help protect the wetland. One outstanding issue is the groundwater elevation. Submitted data is somewhat inconsistent. Low floor elevations and stormwater facilities are compared to groundwater level. Floor pads must be four feet above groundwater, and the bottom of ponds and infiltration basins must be above groundwater enough to function properly. Water: Each home will have individual wells for water. The wells must meet minimum separations from septic system facilities. This will be addressed with well permits from the MN Dept. of Health. Sewage Treatment: The development uses a sophisticated sewage treatment system that includes both individual treatment and a community mound. Most treatment will occur within the multiple tank- and - treatment facilities on each lot. This allows for monitoring and maintenance of individual lots without interfering with the elements of the system used by all lots. It also minimizes the treatment that is needed in the common mound absorption field. There is a minimum amount of flow that must occur for the overall system to operate properly. The system designer has proposed dividing the mound system into several zones with valves. In effect, this allows increasing the area of the mound being used as needed. The specific details will need to be determined as part of the final design, which will be required before any site work begins or the final plat is approved. Wetlands and Stormwater Management: The Rice Creek Watershed District (RCWD) has approved the delineation of the wetlands on the site and the mitigation plan. The wetland complex to the east of the site, which corresponds with Rick Creek, is DNR total acres wetland acres upland acres Lot 1, Block 1 2.63 0.48 2.15 Lot 1, Block 2 2.00 1.13 0.87 Lot 2, Block 2 2.00 1.24 0.76 Lot 1, Block 3 2.00 0.90 1.10 Outlot A (septic site) 1.03 0.00 1.03 Outlot B (private road) 2.78 0.32 2.46 Outlot C 2.10 1.31 0.79 Outlot D 6.43 6.20 0.23 Outlot E 3.26 2.52 0.74 E Rondeau Lk Rd ROW to be dedicated 1.05 0.09 0.96 total 25.28 14.19 11.09 There will be easements that extend 10' around the wetlands. The house pads on two lots were revised to provide more use of the yard around the house without encroaching on the easements (L2 B2 and L1 B3). In addition, the western border of Lots 1 & 2, Block 2, were moved eastward to increase the area within the outlot versus land within the lots. Removing this area from individual lot ownership is one way to help protect the wetland. One outstanding issue is the groundwater elevation. Submitted data is somewhat inconsistent. Low floor elevations and stormwater facilities are compared to groundwater level. Floor pads must be four feet above groundwater, and the bottom of ponds and infiltration basins must be above groundwater enough to function properly. Water: Each home will have individual wells for water. The wells must meet minimum separations from septic system facilities. This will be addressed with well permits from the MN Dept. of Health. Sewage Treatment: The development uses a sophisticated sewage treatment system that includes both individual treatment and a community mound. Most treatment will occur within the multiple tank- and - treatment facilities on each lot. This allows for monitoring and maintenance of individual lots without interfering with the elements of the system used by all lots. It also minimizes the treatment that is needed in the common mound absorption field. There is a minimum amount of flow that must occur for the overall system to operate properly. The system designer has proposed dividing the mound system into several zones with valves. In effect, this allows increasing the area of the mound being used as needed. The specific details will need to be determined as part of the final design, which will be required before any site work begins or the final plat is approved. Wetlands and Stormwater Management: The Rice Creek Watershed District (RCWD) has approved the delineation of the wetlands on the site and the mitigation plan. The wetland complex to the east of the site, which corresponds with Rick Creek, is DNR