# Organic Adsorption Media for Subaqueous Sediment Capping Projects

Subaqueous sediment capping is used to reduce exposure and migration of contaminated sediments in rivers, lakes, and harbors. Camp-Shinning supplies **granular organic adsorption media** that can be placed as an active cap layer to provide chemical isolation for **NAPL seeps** and hydrophobic organics, including **PAHs** and **PCBs**.

## Why Active Capping Is Used
– Contaminants can migrate from sediment into the water column
– NAPL seeps can create ongoing release over time
– Traditional caps may not capture dissolved hydrophobic organics
– Regulators often require long-term isolation performance

## How Organic Adsorption Media Supports Sediment Caps
An active cap layer can:
– Adsorb hydrophobic dissolved organics as they diffuse upward
– Reduce porewater concentrations near the sediment surface
– Help isolate NAPL seep zones with stronger sorption behavior
– Improve cap performance in locations with complex organics

## Placement and Constructability Considerations
For underwater installation, granular media can be delivered as:
– A discrete active layer beneath a protective cover layer
– A blended layer with compatible cap materials
– A targeted placement zone for seep control

The granular structure can aid settling through the water column during placement, improving field constructability.

## Design Inputs Commonly Requested
– Target contaminant list (NAPL, PAHs, PCBs, oil-related organics)
– Water depth, currents, and placement method
– Required cap thickness and footprint area
– Long-term monitoring plan and performance criteria

## Supply and Packaging
Camp-Shinning provides 25 kg bags and bulk project logistics for capping projects, including staged delivery plans and packaging adapted for marine work sites.

## FAQ

### What contaminants can an active cap address?
It is used for hydrophobic organics such as oils, NAPL-related compounds, PAHs, and PCBs that can migrate from sediment porewater.

### Can granular media be placed underwater safely?
Yes. With appropriate placement methods, granular media can settle and form a consistent layer beneath a protective cover.

### Is it used alone or with other cap materials?
It is typically used as an active layer under an armoring or protective layer, depending on site conditions.

### How is cap thickness determined?
Thickness depends on contaminant flux, sediment conditions, and performance targets established during design.

## Related Long-Tail Keywords
– active sediment capping adsorption media
– subaqueous cap material for PAHs PCBs
– NAPL seep control cap layer media
– underwater placement granular adsorption media
– hydrophobic organics isolation in sediments