Factoring Stormwater Source Control and Natural Recovery Into Long-Term Risk Management Planning for Harbour Sediment
Notice bibliographique
Résumé
Sediments within the Lot 17 area of Victoria Harbour (B.C.) are managed by Transport Canada. Over the past several years, Transport Canada and Public Works Government Services Canada (PWGSC) have been evaluating the nature and extent of contaminated sediments within the Lot 17. These studies have included the recent completion of a human health and ecological risk assessment. These studies have also included evaluation of ongoing source inputs and natural recovery processes to understand the role of these processes in controlling contaminant concentration trends over time in sediments and harbour biota.Ongoing stormwater source inputs were evaluated, and these were found to be significant particularly for polychlorinated biphenyls (PCBs). The most significant inputs were associated with a small number of stormwater outfalls located in current/former industrial areas. Contaminant loadings from stormwater outfalls were modeled to evaluate the significance of these inputs both to the aquatic food web, as well as to potential recontamination of harbour sediments. These studies have been useful to prioritize certain stormwater basins for coordinated source control work with the local municipality, in parallel with risk management planning for harbour sediments.Natural recovery processes within the harbour have been quantified directly using sediment geochronology cores, and using trend analysis in sediments and tissues over time. Despite the presence of ongoing source inputs, natural recovery rates have been shown to be significant both for harbour sediments. The decreasing contaminant trends observed for sediment are also observed in harbour biota. Substantial reductions in PCB and dioxin/furan concentrations have been documented in the tissue of Dungeness Crab during over 20 years of biomonitoring. Evaluation of risk management options for the harbour sediments has considered ongoing monitored natural recovery and its benefits to further long-term risk reduction.Ongoing remediation and risk management planning is focused on detailed options evaluationfor a localized hot spot area within the harbour. For other harbour areas with low defined risks,risk management planning will include coordination of source control activities with the localmunicipality, and monitoring of recovery in sediment and tissue contaminant concentrations.
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Comment cette classification a été obtenuedéplier
Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».