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Case Study : River Vantaa Matti Verta,Tuomas Mattila, Jukka Mehtonen, Kimmo Silvo, Jaakko Mannio, Susan Londesborough, Sari Väisänen, Kirsti Lahti Final Conference June 24 - 25 Maastricht, The Netherlands 1 Introduction case study: River Vantaa • • • • • Catchment area 1 686 km2 Population of 1 milj. inhabitants Agriculture (24 % cultivated) Industry (dairy, food, metal, paint, detergent, plastics) Drinking water source (secondary) to Helsinki Metropolitan area • Irrigation source • Recreation object • Cultural scenery and objects Final Conference June 24 - 25 Maastricht, The Netherlands 2 Introduction case study: River Vantaa • Substances – PAH, PBDE, Nonylphenol, DEHP, TBT (TPhT) • Sources – 250 potential plants/sources • Connected to MWT plants – Atmospheric sources (PAH) – Harbor activity, source of TBT in the estuary – Diffuse sources (DEHP, PAH, PBDE)/urban run off • Occasional exceedances of EQS – PAH, DEHP, TBT • TBT concentrations high in sediments Final Conference June 24 - 25 Maastricht, The Netherlands 3 Final Conference June 24 - 25 Maastricht, The Netherlands 4 Specific challenges • Most measurements from river mouth – Compliance upstream? – Use of models • Source/sector specific emission factors not applicable, – Need for STP data, extrapolation – Use of sewage sludge data • Overflows and operational problems in pumping stations Final Conference June 24 - 25 Maastricht, The Netherlands 5 Specific challenges • Urban run off water – Probably an important source for PAH and DEHP (PBDE, NP) • No measurements available • Modeling may be used for PAHs (emission estimates available) • Sludge use for landscaping, gardens, public parks • Leakage of PSs? Final Conference June 24 - 25 Maastricht, The Netherlands 6 Lessons learned from case study • SOCOPSE tools applicable – DSS, Substance reports • Stakeholder involvement essential – Local knowledge – Acceptability of measures (inc. costs/benefits) • Defining complience sometimes difficult – Low EQS compared with analytical uncertainty – Lack of data – Modeling Final Conference June 24 - 25 Maastricht, The Netherlands 7 Lessons learned from case study • Costs of complience hard to estimate for PS – Proposed mangement options serve many objectives • Improved management of urban run off • Better sewage treatment plant operation • Renovation of sewer systems • Management (dredging) of TBT-contaminated sediments expensive compared with (uncertain) benefits • Adaptive monitoring when combined with modeling proved to be cost efficient Final Conference June 24 - 25 Maastricht, The Netherlands 8