Summary of Specifications:
The Malletts, Traver and Allen Creek Drainage Districts with the support of the Washtenaw County Water Resources Commissioner (WCWRC) and the City of Ann Arbor has chosen to take action to improve water quality in the Middle Huron watershed. The Impervious Area Disconnection and Infiltration Project is a product of a Project Plan that has been developed to help reduce non-point source stormwater pollutants (NPS), flooding, and flow to the Huron River and the surrounding community by infiltration of stormwater runoff. Focusing on NPS pollutant removal will help the County and City achieve the Michigan Department of Natural Resources and Environment (MDNRE) enforced Total Maximum Daily Loads (TMDL) for phosphorous, Escherichia coli (E. coli), and biota along the Huron River. The site locations for this project are in the Malletts Creek, Traver Creek and Allen Creek watersheds. This project involves retrofitting sites to incorporate infiltration Best Management Practices (BMP) on City properties where no infiltration facilities currently exist. Site locations have been selected based on their soil type (A and B soils only), impervious area (>= 500 square feet of impervious area/site), and logical suitability for infiltration BMP implementation based on evaluation by City Staff. A design minimum criteria has been provided for each site, however, the City desires to maximize treatment opportunity at each location.
