Minnesota's Legacy

Saint Louis River Area of Concern - Dock Wall Sediment Investigation – Slip C

Project Details by Fiscal Year
2018 Fiscal Year Funding Amount
$20,983
Fund Source
Clean Water Fund
Recipient
Bay West Inc
Recipient Type
For-Profit Business/Entity
Status
Completed
Start Date
February 2018
End Date
June 2018
Activity Type
Technical Assistance
Counties Affected
St. Louis
St. Louis
2018 Fiscal Year Funding Amount
$20,983
Number of full time equivalents funded
.08
Project Overview

The Minnesota Pollution Control Agency (MPCA) and Wisconsin Department of Natural Resources (WDNR) are currently working together to implement a comprehensive long-term plan to delist the Saint Louis River Area of Concern (SLR AOC). Many of the Beneficial Use Impairments (BUIs) in the AOC are linked to the presence of sediment contaminants. Bay West understands the MPCA is overseeing sediment remedial actions at Slip C. Currently, the United States Army Corps of Engineers (Corps) is completing design an engineered cap over the contamination footprint at Slip C; however, a sound navigation and ranging (SONAR) and light detection and ranging (LIDAR) survey in Slip C revealed serval areas of dock wall deterioration resulting in erosion and deposition of backfill material from behind the dock wall onto the Slip C bottom. It is unknown whether the backfill material in these areas is contaminated. If the material is not contaminated, the additional material on top of the cap will only further stabilize the cap. If the material is contaminated, the eroded material will have to be leveled within the remedial footprint prior to constructing the cap. Characterization of the eroded backfill material is required for the Corps to complete the engineered cap design.

Project Manager
First Name
Steve
Last Name
Schoff
Organization Name
Minnesota Pollution Control Agency
Street Address
520 Lafayette Rd N
City
Saint Paul
State
MN
Zip Code
55155
Phone
(651) 757-2701