02-18-2025 Planning Commission Packet (2)

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Pinnacle Engineering, Inc. Wetland Determination Report 11541 95th Avenue North Hamm Property Maple Grove, MN 55369 May 24, 2021 763-315-4501 Page 6 Pinnacle Project Number: EM20212672 extends northeast from the intersection of Shoreline Drive and Orono Orchard South to Fox Street. The southern property extends from the intersection of Shoreline Drive and Orono Lane south to Lake Minnetonka. The Site consists of houses, gardens, fallow fields, wooded areas, and wetlands. The level 2 delineation was conducted in substantial conformance with the 1987 U.S. Army Corps of Engineers Wetland Delineation Manual, updated February 25, 1997, and utilized the Midwest Regional Supplement. The elevation of the properties ranges from 1,000 feet AMSL to 940 feet AMSL and from 996 feet AMSL to 940 feet AMSL in the northern property, separated by Fox Street. The eastern property elevation ranges from approximately 968 feet AMSL in the northern portion to approximately 932 feet AMSL. The southern elevation ranges from 944 feet AMSL to 928 feet AMSL, where Lake Minnetonka is located. Based on the contour intervals on the topographic map, surficial drainage appears to drain to the south, toward Lake Minnetonka. The Soil Survey indicated hydric soil are located in the areas of Wetlands 1 (Lake Minnetonka) and 3. According to the NCRS Soil Survey, the remainder of the wetland areas are not located in hydric soils. The 2021 seasonal antecedent rainfall amounts were within the normal precipitation amounts for this area. Rain in the amount of 0.08 inches occurred the fourteen days prior to the wetland delineation field visit. Wetland 1 is the shore of Lake Minnetonka. Under the Cowardin system Wetland 1 would be considered a L2UBH deepwater habitat with a forested wetland fringe. Under the Circular 39 system, Wetland 1 is considered a Type 5 wetland. The majority of the wetland fringe is dominated by buckthorn. Hydric soils and wetland hydrology were found to be present. The wetland boundary was determined on the northern edge of the wetland and followed the topography and elevation of the slopes from the upland area to lake Minnetonka. Wetland 1 extends to the south beyond the Site boundary. Wetland 2 is a basin located in the southern portion of the of northern area of interest. Under the Cowardin system Wetland 3 would be considered a palustrine, emergent, persistent, temporary flooded (PEM1A) basin. Wetland 2 consists of a swale that funnels drainage from the surrounding upland area. A roadway and underlying culvert appear to slow and constrict the drainage of the wetland to the south. Under the Circular 39 system, Wetland 2 is considered a Type 2 wetland. Wetland 2 is dominated by hydrophytes comprised primarily of reed canary grass. Hydric soils were found to be present. Hydrology appeared to be present and was based on water in the sampling hole within 12 inches of the surface. The wetland edge was determined on the southeastern edge of the wetland and followed the vegetation change along the swale. Wetland 3 is a large basin located in the northeastern portion of the of northern area of interest. Under the Circular 39 system, Wetland 3 is considered a Type 3 wetland. Under the Cowardin system Wetland 3 would be considered a palustrine, emergent, persistent, seasonally flooded (PEM1C) basin. Culverts enter Wetland 3 at various locations along the wetland border. Wetland 3 is dominated by hydrophytes comprised of a reed canary 349