RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY DI OXI NS AND FURANS Note: gray points are not detected SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY BUTYLTI NS Note: gray points are not detected SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY PCBS • Dioxins and Furans • Signficant declines in concentrations over time • Inner Bay • West Bay Note: gray points are not detected SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY TOTAL PESTI CI DES Note: gray points are not detected SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
RESULTS: 2 0 1 0 GULF OF MAI NE SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016 RESULTS: 2 0 1 0 GULF OF MAI NE METALS
RESULTS: 2 0 1 0 GULF OF MAI NE PAHS * * * SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) * : statistically significant difference in SEPTEMBER 14, 2016 concentrations by area
RESULTS: 2 0 0 0 - 2 0 1 0 GULF OF MAI NE PAHS SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
RESULTS: 2 0 0 0 - 2 0 1 0 GULF OF MAI NE • Add Lauren’s revised version Great Bay Great Bay Great Bay Casco Bay Casco Bay Total PAHs (ng/g) 10 100 1000 10000 Casco Bay Gulf of Maine Note: gray points are not detected SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
SUMMARY Chem ical Group Casco Bay Casco Bay Gulf of Maine 2 0 1 0 -2 0 1 1 1 9 9 1 -2 0 1 1 ( GoM) Metals Below screening Declining/ stable, Consistent with values* selenium? GoM PAHs Below screening Decline since Lower than GoM values 2000-2002 Dioxins and Furans Concentrations are Decline since NA low 2000-2002 Butyltins Concentrations Decline over all NA low, not detected sampling events PCBs Rarely detected Expected NA (rarely (elevated DL) continued decline detected) Pesticides Rarely detected Expected NA (rarely (elevated DL) continued decline detected) SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
FUTURE RESEARCH CONSI DERATI ONS • Metals – selenium? • PAHs – unexpected result, notable response to source reduction? • Emerging Chemicals/ Substances of Concern • Pesticides • Flame Retardants • Microplastics • Pharmaceuticals SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016
SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011) SEPTEMBER 14, 2016 THANK YOU
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