|
Sediment Remediation
AquaBlok
Installation Profiles
| Eagle River Flats Superfund Site in Fort Richardson, Alaska [US EPA Region 10] |
| Completed in 1994 |
| Wetland (freshwater, with periodic brackish tidal inundation). Encapsulation of contaminated sediments. |
| White Phosphorous (WP) |
| Placed at hydrated thicknesses ranging from approximately 2.4 inches (~6 cm) on level ground to approximately 6.3 inches (~16 cm) in "cratered" areas of the project site. Approximately 4,000 square meters (43,000 square feet). |
| Helicopter with specially designed material drop bags. |
Note: Not actual photo of Eagle River Flats (ERF) demonstration. Blackhawk helicopter with same bags used at ERF. |
| Grasse River, Massena, New York [US EPA Region 2] |
| Pilot completed in September 2001. |
| River (freshwater) |
| Encapsulation of contaminated sediments |
| PCBs (polychlorinated biphenyls) |
| Multi-layer design. Design comprised of a basal layer of hydrated AquaBlok (~3-4 inches or ~8-10 cm in target thickness) covered by a surficial layer of sand/topsoil mix (~6 inches or ~15 cm in target thickness). Site area was 2,760 square meters (29,700 square feet). |
| Barge-based crane plus clamshell. |
  |
| Ottawa River in Toledo, Ohio [US EPA Region 5(1)] |
| Completed in September 1999 |
| River (freshwater) with estuary characteristics. Encapsulation of contaminated sediments. |
| PCBs (polychlorinated biphenyls), various metals |
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 in target thickness).
- The site area was 9,950 square meters (107,000 square feet).
|
| Various methods demonstrated, including: telescoping - articulating conveyor (barge- and shore-based), crane plus clamshell (shore-based), helicopter with specially designed material drop bags. |
 |
| Upper Outfall in Macon, Georgia [US EPA Region 4] |
| October 2001 |
| River (freshwater). Encapsulation of contaminated sediments. |
| PAHs (polynuclear aromatic hydrocarbons). |
| Multi-layer design comprised of a basal layer of hydrated layer (~6-7 inches or ~15-18 cm in target thickness) covered by a layer of sand (~4-6 inches or ~10-15 cm in target thickness) covered by a surficial layer of riprap stone (~36 inches or ~91 cm in target thickness). Site area was 150 square meters (1,600 square feet). |
| Shore-based excavator. |
 |
| Deer Creek Superfund Project in St. Louis, Missouri [US EPA Region 4] |
| Completed February 2002 |
| River (freshwater). Encapsulation of contaminated sediments, within the context of a bank stabilization project. |
| Hydrocarbon/petroleum-based (creosote) from an industrial process plant. |
Multi-component design:
- River-channel area: Layer of hydrated AquaBlok (~6 inches or ~15 cm in target thickness) covered by a non-woven geotextile covered by a surficial layer of aggregate and riprap stone (~26 inches or ~66 cm in target thickness).
- Bank-slope area: Layer of hydrated AquaBlok (~6 inches or ~15 cm in target thickness) placed in Geoweb cells covered by a non-woven geotextile covered by a surficial layer of aggregate and riprap stone (~26 inches or ~66 cm in target thickness).
- Site was 510 square meters (5,500 square feet).
|
| Material typically placed directly from SuperSacks suspended from a shore-based excavator. |
 |
| Fraser River in Burnaby, British Columbia [British Columbia (Canada)] |
| Completed Summer 2003 |
| River (freshwater) - Encapsulation of contaminated sediments, within the context of a wetland restoration project |
| Organic (creosote-related) contaminants |
| Multi-layer design. Design comprised of a layer of hydrated AquaBlok (~12-15 inches or ~31 to 38 cm in target thickness) covering a sand/gravel bedding layer and covered by a sand/gravel layer (~12 inches or ~31 cm in target thickness) covered by a marsh topsoil (~24 inches or ~61 cm in target thickness). The AquaBlok material was also underlain by a 39 inch- or one meter-thick gas vent layer. Site area was 4,170 square meters (44,800 square feet). |
| Crane with concrete bucket. |
| |
| Anacostia River in Washington, D.C. [US EPA Region 3] |
| Completed April 2004 |
| River, tidally influenced (freshwater). EPA SITE Program (Superfund Innovative Technology Evaluation). Demonstrated encapsulation of contaminated sediments, within the context of an “active caps” designed to accomplish contaminant treatment concurrent with encapsulation |
| PAHs (polynuclear aromatic hydrocarbons); PCBs (polychlorinated biphenyls); and metals. |
| Multi-layer design. Design comprised of a basal layer of hydrated AquaBlok (~4 inches or ~10 cm in target thickness) covered by a surficial layer of sand (~8 inches or ~20 cm in target thickness). Site area was 745 square meters (8,000 square feet). |
| Barge-based crane plus clamshell. |
 |
| Kearny Marsh in Kearny, New Jersey [US EPA Region 2] |
| Completed in August 2005 |
| Freshwater marsh – Encapsulation of contaminated sediments. |
| PAHs (polynuclear aromatic hydrocarbons) and heavy metals. |
| Design variations comprised of a layer of hydrated AquaBlok (~6 inches or ~15 cm in target thickness), carbon-amended AquaBlok, and sand. Site area was comprised of six test plots of 3,600 SF each, for a total of 21,600 SF. |
| Land-based stone slinger. |
 |
| Chattanooga Creek in Chattanooga Tennessee [US EPA Region 4] |
| Completed in November 2006 |
| Freshwater creek and floodplain area. Seal/Liner construction to isolate mobile contaminants in surrounding area. |
| PAHs (polynuclear aromatic hydrocarbons). |
| Layer of 3070FW Blended Barrier product was applied in 8” thickness in prepared creek bed and hydrated. A 6” layer of native soil was applied over the cap. Site area was comprised of a 2,000-foot segment of the creek which included an oxbow, for a total of over 175,000 SF. |
| Land-based stone dump trucks and long-stick excavator. |
 |
|
