Wetland delineation report-2008 - Laserfiche WebLink

Home Browse Search

Introduction On July 23`d 2008, ecologists from Svoboda Ecological Resources (SER) completed a field investigation of the subject property to identify and delineate areas meeting wetland criteria in accordance with the 1987 Army Corps of Engineers Wetland Delineation Manual and the Interim Midwest Region Supplement Delineation Manual. As depicted in Figure 1, the site is located in the city of Orono. � The approximate 14 acre site has the following legal description in the City of Orono, Hennepin County, Minnesota.: • Located in part of the SW 1/a of Sec. 30, T118N, R23W Only one wetland was identified on the subject property. SER deternuned that normal circumstances were present at the time of the field investigation. Methods The USGS Topographic Map (Figure 1), Hennepin County Soil Survey (Figure 2), National Wetland Inventory Data (Figure 3), the Department of Natural Resources Protected Waters Inventory (Figure 4), and aerial photographs were reviewed prior to the field investigation to identify potential wetland habitats. The parcel boundary was determined using a property description given by the owner and GIS data available from � the Hennepin County Website. The following procedures were used to determine wetland habitats: . • The vegetation was sampled to determine whether greater than 50% of the dominant plant species were classified as either obligate wetland, facultative wetland, or facultative. • Shallow soil pits were hand dug with a soil auger to identify soil morphology, redoximorphic features and soil texture. • Wetland hydrology indications were observed through open soil pits, shallow water table measurements, and historical data. The wetland hydrology determination uses the criteria of the presence of water within 12 inches of the surface for 14 days during the growing season, or within 24 inches of the surface during the dry part of the growing season. The wetland boundary was marked with sequentially numbered neon orange pin flags and the surrounding tall grasses were flagged with neon orange "Wetland Boundary" tape to ease in the identification of the boundary on later dates. One sample transect was completed for the identified wetland. Two sample points were taken; one in the wetland and one in the upland area. The wetland boundary exists between these two points. . Additional sample points were used throughout the delineation to verify vegetation,