St. Louis Rivier/Interlake/Duluth Tar Site Remediation Sediment Operable Unit - 2006 Sand Cap/Surcharge Project Duluth, Minnesota
Type:
Presented during:
WODCON XVIII - 2007 Orlando, Florida, USA
Authors:
Bell, Tracy
Abstract: The work was performed within Stryker Bay, in the St. Louis River estuary, approximately 6.4 kilometers (4 miles) up river from Lake Superior in Duluth, Minnesota, at the St. Louis River/Interlake/Duluth Tar Site (SLRIDT) site. The scope of work for this phase of the project required the installation of a 616 meter (2,020 LF) sheet-pile containment wall around an 4.45 hectares (11-acre) area in the Bay, with subsequent placement of a sub-aqueous sand cap/surcharge of approximately 68,814 cubic meters (~90,000 cubic yards), followed by conventional/civil sand cap/surcharge placement effort of approximately 68,814 cubic meters (~90,000 cubic yards). The scope of work also included site preparation; spill boom and silt curtain installation and maintenance; installation of deep and shallow sediment monitoring instrumentation; performing a sub-aqueous capping demonstration lift; and subaqueous installation of approximately 44,313 square meters (53,000 square yards) of a Reactive Carbon Mat (RCM) geo-textile material between the first 15.2 centimeters (6 inch) lift of sand and the remaining material placed.
The project approach developed focused on the goal of providing the safest, most cost-effective, efficient, and best quality service possible to meet the stakeholder's objectives. This was accomplished by coordinating the work effectively with the stakeholders, regulatory agencies, and the public to meet the required schedule completion date.
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