CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT - - PowerPoint PPT Presentation
CASE STUDY. PORT SUSTAINABILITY: DREDGED MATERIAL MANAGEMENT Contact: T.ANGEL DEL VALLS University of Cdiz UNESCO/UNITWIN7WiCop. Marine and Environmental Sciences Faculty Av. Repblica Saharaui, s/n 11510-Puerto Real (Cdiz) SPAIN
Contact: T.ANGEL DEL VALLS University of Cádiz UNESCO/UNITWIN7WiCop. Marine and Environmental Sciences Faculty Av. República Saharaui, s/n 11510-Puerto Real (Cádiz) SPAIN Phone: +34 956 01 6794 Fax: +34 956 01 6040 e-mail: angel.valls@uca.es
Dredging is an essential activity for maritime
sand and mud deposited by water currents estuarine areas –high deposition of riverine
Step 1: Project planning, including the nature
Step 2: Initial evaluation, where available data is
Step 4: Interpretation of results of the data
Traditional physico-chemical characterisation
Grain size/TOM Metallic compounds –As, Cd, Cr, Cu, Hg, Ni, Pb, Zn Organic compounds –Σ7PCBs Not always required- Σ12PAHs
Comparison with limit values in use-
National Action Levels, i.e. Spain Other empirically derived SQGs, i.e. TEL/PEL;
Action Action Level Level Approach Approach
AL1 AL2 8XAL2
No risk Evident risk
Management requirements in Spain according
Category Concentrations Aquatic disposal Type of license Requirements I C< AL1 Free aquatic disposal Normal authorization
studies and biological effects (physical/ mechanic). II AL1< C< AL2 Dumping under controlled conditions Special authorization
and justification.
management.
III C> AL2 Dumping under adequate management techniques Special authorization
study and source control measures
and justification.
program.
Ecotoxicological characterisation of sediment
Mortality Acute 10 days Whole sediment Adult amphipod Endpoints Type of tests Duration Exposure route Bioassay
Informs on the potential toxic effects
benthic infauna.
Ecotoxicological characterisation of sediment
Arrested or abnormal development Acute/chronic 48 hours Elutriates Sea urchin embryos Endpoints Type of tests Duration Exposure route Bioassay Normal Abnormal
Informs on the potential toxic effects
during dredging/disposal.
Bioaccumulation potential of metals in
Tissue concentrations
28 days Whole sediment Juvenile clams Endpoint Duration Exposure route Bioassay
Informs on the potential bioaccumulation of compounds in commercial
health risks.
Dredged sediments from Port of Cadiz
Mud Mud Sand Comments CA4 Further assessment
potential of Hg II CA3 Confined disposal, isolation depending on Toxicity Identification Evaluations
III CA2 Beach nourishment No I CA1 Management option Toxicity? Category Sample
Dredged sediments from Port of Huelva
Land reclamation Construction Coarse No I H4 Mud/sand Mud Mud Comments Separation (sand/mud) Confined disposal, hard isolation
III H3 Confined disposal, hard isolation
III H2 Confined disposal, soft isolation
I H1 Management option Toxicity? Category Sample
Dredged sediments from Port of Santos
Not suitable for sea disposal Fines <10% Yes I SSV6 Not suitable for sea disposal Fines <10% Yes I SSV5 Not suitable for sea disposal Fines <10% Yes I SSV4 Fines <10% Fines <10% Fines <10% Comments Not suitable for sea disposal Yes II SSV3 Not suitable for sea disposal Yes II SSV2 Beneficial uses No I SSV1 Management option Toxicity? Category Sample
Further information on potential toxicity would allow to identify least detrimental management option.
Environmental benefits: Risk-based decisions. Environmental benefits: Risk-based decisions. Integrated approach for dredged material management (CHEMICAL+ECOTOXICOLOGICAL): Integrated approach for dredged material management (CHEMICAL+ECOTOXICOLOGICAL): Economic benefits: Re-use of contaminated but not toxic sediments Economic benefits: Re-use of contaminated but not toxic sediments Costs of characterisation: Only for not-completely characterised sediments - categoría II-. Management costs: For intermediate contaminated sediments causing toxicity.