12/18/2013 Env Bd Packet - Laserfiche WebLink

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ground surface. The water observed in the borings appears to be associated with sand seam(s) within the glacial till soil while the water observed in B -8 appears to be perched in the sandy soils above the underlying clays. Groundwater measurements were made as noted and shown on the boring logs. Ground water was not encountered in borings B -3, B -4, B -5, B -6 or B -9 while drilling or after removing the augers from the boreholes. See attached map, (previous concept map) of boring locations. Soils Soils on this site are a heavier type of soil with lower infiltration rates and higher runoff rates. It is interesting to note that this site is on the edge of Anoka County Sand Plain with sandy soils bordering the site on the northwest. This is the start of the Anoka County Sand plain to the west. Because soil borings indicated sandy soil seams on the site, proof should be given that wetlands in the vicinity will not be drained by opening up any sand seams, or a contingency plan to seal off wetland draining seams. Land Cover Over the years the land cover has changed from cultivated to grassland or non - cultivated vegetation on hydric and non - hydric soils. Rare and Unique Resources The AUAR requires a Rare Plant Inventory be performed if there are wetlands on the site inside the AUAR. The Habitat is not suitable for rare plants on this site; however, in order to satisfy the requirement of the AUAR, a letter from a company like Critical Connections, Inc, stating that it is to suitable Habitat would suffice. Wetlands The NorthPointe wetland delineation report dated December 3, 2013 identified eight (8) wetlands as shown on the existing conditions survey (Kjolhaug, Figure 3). The developer is proposing to fill 11,784 SF of Wetland. The developer is proposing to mitigate filled wetlands with 81,292 SF of new created wetland area. Since RCWD is the Regulating Government Unit (RGU), any fill will require approval of the RCWD including a mitigation plan. A mitigation consideration that should be investigated is some form of hydrologic restoration. Wetland mitigation credit can be obtained for this action. City staff recommends a hydrologic restoration on this site be investigated for wetland mitigation credit. There is a "Natural Resource Conservation Areas" on this site. This area consists of a wetland complex on the South East side. A portion of a "Wetland Preservation Corridor" 2 • • •