Cost‐Effective Sediment Dredge Disposal Options for Small Craft Harbors in Canada

Walker, Tony R.; MacLean, Bradley; Appleton, Rebecca; McMillan, Scott; Miles, Mary

doi:10.1002/rem.21371

Cited by 24 publications

(3 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Many of these divested harbors have legacy contaminant issues, with many requiring costly maintenance dredging and disposal of contaminated sediments (Walker et al, 2013e).…”

Section: Potential Future Harbour Management Issuesmentioning

confidence: 99%

Ecological Risk Assessment of Sediments in Sydney Harbour, Nova Scotia, Canada

Walker

Willis

Gray

et al. 2014

Soil and Sediment Contamination: An International Journal

Self Cite

View full text Add to dashboard Cite

Contamination within sediments of Sydney Harbour (once a major industrial port) were evaluated using a multiple lines-of-evidence (LOE) ecological risk assessment (ERA) approach prior to divestiture of the harbor. The multiple LOE approach included: (1) measurement of polycyclic aromatic hydrocarbons (PAHs), polychlorinated biphenyls (PCBs), metals, metalloids, petroleum hydrocarbons (PHCs), and total organic carbon (TOC) concentrations in surface sediments from multiple Sydney Harbour locations; (2) identification and application of sediment quality guidelines (SQGs) from various jurisdictions; (3) comparisons of harbor sediment chemistry against background/reference sediment chemistry; (4) determining number and frequency of exceedances over SQGs; (5) calculating mean probable effect level-quotients (PEL-Qs); (6) PAH forensic source evaluation; (7) review of previous sediment chemistry and biota tissue data; and (8) characterizing benthic habitat at harbor stations. The ERA determined that current sediments exhibited mostly low probability of adverse effects. Furthermore, contaminated sediments exhibiting a high probability of adverse effects were localized to only a few stations within the harbor. Ongoing natural recovery of harbor sediments is likely responsible for attenuating contaminants that historically were higher than those measured in this study and were previously distributed over much wider areas of the harbor. Results suggest that legacy industrial activities and current urban sewage effluents are the major sources of contamination in Sydney Harbour sediments.

show abstract

“…Many of these divested harbors have legacy contaminant issues, with many requiring costly maintenance dredging and disposal of contaminated sediments (Walker et al, 2013e).…”

Section: Potential Future Harbour Management Issuesmentioning

confidence: 99%

Ecological Risk Assessment of Sediments in Sydney Harbour, Nova Scotia, Canada

Walker

Willis

Gray

et al. 2014

Soil and Sediment Contamination: An International Journal

Self Cite

View full text Add to dashboard Cite

show abstract

“…Results Removal. Sediment dredge disposal options were reviewed in response to recent federal regulatory changes in sediment quality guidelines adopted by provincial regulators in Canada that has resulted in updates to guidelines for disposal of contaminated solids in landfills (Walker et al, 2013).…”

Section: Phytoremediationmentioning

confidence: 99%

Contaminated Aquatic Sediments

Jaglal¹

2014

Water Environment Research

View full text Add to dashboard Cite

show abstract

“…SCHs in Nova Scotia are small water lots that support various fisheries industries and are managed by Fisheries and Oceans Canada-Small Craft Harbors (DFO-SCH). Previous studies have identified that PAHs and other contaminants are commonly present in detectable concentrations in sediments of Nova Scotia SCHs (Walker, MacLean, et al, 2013;Davis et al, 2018;Zhang et al, 2019).…”

mentioning

confidence: 99%

Estimating PAH sources in harbor sediments using diagnostic ratios

Davis

Walker

Adams

et al. 2019

Remediation Journal

Self Cite

View full text Add to dashboard Cite

Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous in the global environment and are subsequently transported into aquatic sediments. As PAHs are formed by various processes, source identification using diagnostic ratios can provide insight to PAH emission sources to distinguish between pyrogenic and petrogenic PAH sources. PAH diagnostic ratios were applied as a forensic source apportionment technique to assess aggregate historical sediment data from 31 small craft harbors (SCHs) across Nova Scotia, Canada. Multiple diagnostic ratios suggest that PAHs present in Nova Scotia SCH sediments are pyrogenic (combustion) in origin, while consistently suggesting that coal‐related PAH sources are potential dominant specific sources. National Institute of Standards and Technology Standard Reference Materials (SRMs) were used as reference for coal tar, urban dust, and diesel exhaust particulates in ratio applications. The SRM for coal tar was most similar to Nova Scotia SCH sediments in multiple ratio applications. Diagnostic ratio results were corroborated by comparing the PAH profile of sediments to source profiles from the literature. Results indicate that Nova Scotia SCH sediments follow global trends by exhibiting a dominant pyrogenic PAH signature, and the specific coal‐related PAH signature of Nova Scotia SCH sediments may be influenced by contamination inputs related to historical industrial coal mining and combustion activities in the province.

show abstract

Cost‐Effective Sediment Dredge Disposal Options for Small Craft Harbors in Canada

Cited by 24 publications

References 9 publications

Ecological Risk Assessment of Sediments in Sydney Harbour, Nova Scotia, Canada

Ecological Risk Assessment of Sediments in Sydney Harbour, Nova Scotia, Canada

Contaminated Aquatic Sediments

Estimating PAH sources in harbor sediments using diagnostic ratios

Contact Info

Product

Resources

About