As part of the early planning phases for a large business park, the Village of Pleasant Prairie retained raSmith to conduct a wetland delineation for an approximately 454-acre site referred to as “Prairie Highlands Corporate Park.” The wetland delineation consisted of a review of available maps and information followed by fieldwork in June 2017 to document field conditions. The presence and absence of hydrophytic vegetation, wetland hydrology and hydric soil indicators were documented using methodology defined in the US Army Corps of Engineers (USACE) 1987 Wetland Delineation Manual, Regional Supplement to the 1987 Corps of Engineers Wetland Delineation Manual: Midwest Region (USACE ERDC, 2010) and Guidance for Submittal of Delineation Reports to the St. Paul District Army Corps of Engineers and the Wisconsin Department of Natural Resources (USACE St. Paul District, 2015).
Twenty-six wetlands, one ditched tributary to the Des Plaines River and one narrow intermittent drainageway were identified within the Study Area by raSmith Assured Delineators in June 2017. Since there was some potential farmed wetlands within the Study Area, a review of growing season aerial photography was also completed to determine the presence or absence of wetland signatures within agricultural portions of the Study Area. Available aerial photos from the most recent 20-year period were analyzed for wetland signatures, antecedent precipitation was calculated for the three months prior to each photo, and a summary was completed detailing the findings of the review.