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Full Project Description Located at: view PDF

Site Location: US EPA Region 5(1) Ottawa River, Toledo, Ohio

Project Status: Completed in September 1999

Setting / Purpose: River (freshwater) with estuary characteristics. Encapsulation of contaminated sediments.

Contaminant(s) of Concern: PCBs (polychlorinated biphenyls), various metals

AquaBlok Cap Design / Site Area: Three different cap designs of approximately equal area and occurring within three different sections of the site (Section A, Section B, and Section C): • Section A cap: Design comprised of a layer of hydrated AquaBlok (~5-6 inches or ~13-15 cm in target thickness). • Section B cap: Design comprised of a basal geogrid component (Tensar) covered by a layer of hydrated AquaBlok (~5-6 inches or ~13-15 cm in target thickness). • Section C cap: Design comprised of a basal geogrid component (Tensar) covered by a layer of hydrated AquaBlok (~5-6 inches or ~13-15 cm in target thickness) covered by a surficial layer of stone-armor material (~2 inches or ~5 cm intarget thickness). • The site area was 9,950 square meters (107,000 square feet).

Method of Placement: Various methods demonstrated, including: telescoping - articulating conveyor (barge- and shore-based), crane plus clamshell (shore-based), helicopter with specially designed material drop bags.

Peruse EPA Region 5(1) Website