Abstract Title

Session S-04F: Advancing Sediment Remediation in the Salish Sea

Keywords

Restoration

Start Date

1-5-2014 8:30 AM

End Date

1-5-2014 10:00 AM

Description

A demonstration project for Pier 7 at the Puget Sound Naval Shipyard & Intermediate Maintenance Facility (PSNS&IMF) located in Sinclair Inlet, Puget Sound, WA is evaluating and validating the placement, stability and performance of activated carbon to treat contaminated sediments in an active harbor setting. During a fender pile replacement project for Pier 7 at the shipyard in 2010, legacy contamination was identified adjacent to the pier. In October 2012, the contaminated area was amended with powdered activated carbon (PAC) using the AquaGate+PAC™ composite aggregate system to improve delivery, physical stability, and decrease the bioavailability of polychlorinated biphenyls (PCBs), mercury (Hg), and other contaminants in the 190 x 115 ft (58 x 35 m) target. Pre-installation monitoring was conducted in August 2012 and the initial post-installation monitoring was conducted in August 2013 approximately 10 months following placement. The monitoring is being conducted to assess performance after intervals of approximately one, two and three years of placement to document physical, geochemical, and biological conditions at the site with diver-assisted sampling using the Sediment Ecotoxicity Assessment (SEA) Ring protocol, the Sediment Profile Imaging (SPI) camera, benthic infauna sampling, and geochemical analysis. Consisting of autonomous benthic chambers, ten SEA Rings were placed at the site to conduct 14-day in-situ bioassays using clams (Macoma nasuta) and polychaete worms (Nephtys caecoides), deploy passive solid phase micro-extraction (SPME) samplers, and collect sediment samples for analysis of grain size, organic carbon, black carbon, PCBs, Hg, and biological condition of the sediments. Images from the SPI camera surveys were used to verify the presence and thickness of the amendment and assess benthic conditions. Results from the pre- and ten month post-installation monitoring events showed that the amendment was achieving the desired performance criteria.

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May 1st, 8:30 AM May 1st, 10:00 AM

Monitoring to assess the effectiveness of an activated carbon sediment amendment to remediate contamination at a site located at the Puget Sound Naval Shipyard & Intermediate Maintenance Facility, Bremerton, WA

Room 602-603

A demonstration project for Pier 7 at the Puget Sound Naval Shipyard & Intermediate Maintenance Facility (PSNS&IMF) located in Sinclair Inlet, Puget Sound, WA is evaluating and validating the placement, stability and performance of activated carbon to treat contaminated sediments in an active harbor setting. During a fender pile replacement project for Pier 7 at the shipyard in 2010, legacy contamination was identified adjacent to the pier. In October 2012, the contaminated area was amended with powdered activated carbon (PAC) using the AquaGate+PAC™ composite aggregate system to improve delivery, physical stability, and decrease the bioavailability of polychlorinated biphenyls (PCBs), mercury (Hg), and other contaminants in the 190 x 115 ft (58 x 35 m) target. Pre-installation monitoring was conducted in August 2012 and the initial post-installation monitoring was conducted in August 2013 approximately 10 months following placement. The monitoring is being conducted to assess performance after intervals of approximately one, two and three years of placement to document physical, geochemical, and biological conditions at the site with diver-assisted sampling using the Sediment Ecotoxicity Assessment (SEA) Ring protocol, the Sediment Profile Imaging (SPI) camera, benthic infauna sampling, and geochemical analysis. Consisting of autonomous benthic chambers, ten SEA Rings were placed at the site to conduct 14-day in-situ bioassays using clams (Macoma nasuta) and polychaete worms (Nephtys caecoides), deploy passive solid phase micro-extraction (SPME) samplers, and collect sediment samples for analysis of grain size, organic carbon, black carbon, PCBs, Hg, and biological condition of the sediments. Images from the SPI camera surveys were used to verify the presence and thickness of the amendment and assess benthic conditions. Results from the pre- and ten month post-installation monitoring events showed that the amendment was achieving the desired performance criteria.