Downers Grove Wetland Mitigation Bank – DuPage County Department of Environmental Concerns
Downers Grove, IL
Work at this 15 acre site consisted of the establishment of a wet meadow wetland mitigation bank. The north eastern cell of the bank area contained a small woodland dominated by garlic mustard and buckthorn. As part of the bank establishment, ENCAP, Inc. cleared the buckthorn, eliminated garlic mustard, and planted specified trees and shrubs. ENCAP, Inc. completed installation in 2002 and has since completed numerous management activities including:
• Planting of native trees and shrubs
• Selective herbicide application of non-native perennial species
• Mowing and weed-whacking of non-native annual species
• Prescribed burning
• Non-native woody shrub removal
The site met U.S. Army Corps of Engineers, Chicago District performance standards in 2009. ENCAP continues to perform long term maintenance on the site for DuPage County.
East Bank West Fork North Branch Chicago River Stabilization
Village of Glenview, IL
This project involved restoration and stabilization of the east bank of the West Fork North Branch of the Chicago River in downtown Glenview, IL. The scope of work involved the removal of woody invasive species through herbicide treatment and mechanical cutting, grading and reshaping the streambank, installation of two flagstone and cobble rock riffle structures, and boulder toe placement along the bank. Existing topsoil and clay materials were exported from the site and an amended soil was respread across the streambank and floodplain to facilitate seeding of native prairie, tree and shrub planting and installation of erosion control blanketing.
Naturalized Stormwater Detention Basin
This project was planted by ENCAP, Inc. in the spring of 2005. Careful management of non-native species was performed throughout 2005, 2006, 2007, and 2008 in an effort to increase native plant growth. In fall of 2008, ENCAP, Inc. received sign-off approval from the U.S. Army Corps of Engineers (USACE), Chicago District. This site now contains sustainable high-quality natural resources to be enjoyed for generations. The photo progression to the right shows the native plant communities from 2006 through 2008.
Randall Oaks Golf Course Wetland Mitigation
The Randall Oaks Golf Course Mitigation Wetland is located within the Village of West Dundee, Kane County, Illinois. Wetland mitigation was required to replace wetland acreage filled by the expansion of the Randall Oaks Golf Course. 1.45 acres of wetland were permitted to be filled to accommodate the proposed site development. To compensate for the filling of wetland, mitigation was required at a 2:1 ratio. Prior to the wetland mitigation effort, the created wetland consisted of a farmed depression with hydric soil. The approved mitigation plan required that A) the created wetland be planted with native vegetation and managed to compliment the enhancement effort and B) a mesic prairie buffer (approximately 1.9 acres) be planted surrounding the mitigation area to enhance water quality and improve site habitat value.
The primary objective of the monitoring program was to track the success of wetland development over the five year period of regularly scheduled monitor¬ing sessions. Specific goals of the monitoring program were to determine the vitality of species planted, the diversity of species growing on-site relative to the planted mixture, the degree of coverage provided by the planted materials, and to list any recommendations for remedial action. In particular, annual vegetative cover should increase to levels pre¬scribed by Kane County. ENCAP, Inc. monitored and managed the site from 2004-2008 in an effort to meet Kane County performance standard requirements.
The results of the monitoring and management efforts are attainment of all required performance standards, sign-off approval from the Kane County Department of Environmental Management, successful high quality plant communities, and sustainable native areas that provide wildlife habitat, erosion and sediment control, and water quality benefits for the area. Today the site consists of high quality prairie and wetland areas, as shown in the photos below. Sign-off of this area was achieved in 2008.