Final Phase Remediation - Regional Detention of Stormwater

Enterprise South Industrial Park (ESIP) was developed on the site of the former Volunteer Army Ammunition Plant. This plant manufactured and stored TNT, resulting in contamination of soils and groundwater. BWSC developed a detailed concept design used to obtain an Aquatic Resource Alteration Permit (ARAP) from the Tennessee Department of Environment and Conservation (TDEC) and a 404 permit and the US Army Corp of Engineers (USACE) for a Regional Stormwater Facility (RSF) . This presentation will describe the design and construction of the second phase of the RSF which provided 330 acre-feet of storm water detention storage for ESIP.

This project restored 2,750 linear feet of the existing Poe Branch by creating 3,700 linear feet of new stream channel constructed using the latest Rosgen Design Guidelines.   In addition to the stream construction, the project included the mitigation, preservation and construction of approximately 25 acres of additional wetlands and preserves approximately 2 acres of the previously existing 3.3 acres of wetlands.  Construction was performed by an experienced and qualified stream and wetland contractor.   This portion of the project was designed to provide for future build-out of the industrial park. Aspects of the project that are of particular interest include:

• Upstream flow control to minimize flooding of the construction area during the construction period. 
• Use of traditional stabilization mixes for temporary cover and native species for final stabilization.
• Incorporation of lessons learned from past stream and wetlands restoration projects.
• Focus on creating an environmentally elegant facility for regional detention while maintaining project cost at construction norms.