Event Title

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

Presentation Abstract

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.

Session Title

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

Conference Track

Restoration

Conference Name

Salish Sea Ecosystem Conference (2014 : Seattle, Wash.)

Document Type

Event

Start Date

1-5-2014 8:30 AM

End Date

1-5-2014 10:00 AM

Location

Room 602-603

Contributing Repository

Digital content made available by University Archives, Heritage Resources, Western Libraries, Western Washington University.

Rights

This resource is displayed for educational purposes only and may be subject to U.S. and international copyright laws. For more information about rights or obtaining copies of this resource, please contact University Archives, Heritage Resources, Western Libraries, Western Washington University, Bellingham, WA 98225-9103, USA (360-650-7534; heritage.resources@wwu.edu) and refer to the collection name and identifier. Any materials cited must be attributed to the Salish Sea Ecosystem Conference Records, University Archives, Heritage Resources, Western Libraries, Western Washington University.

Type

Text

Language

English

Format

application/pdf

This document is currently not available here.

Share

COinS
 
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.