RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY DI OXI NS AND FURANS Note: - - PowerPoint PPT Presentation

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RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY DI OXI NS AND FURANS Note: - - PowerPoint PPT Presentation

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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

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SLIDE 1

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY DI OXI NS AND FURANS

Note: gray points are not detected

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SLIDE 2

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY BUTYLTI NS

Note: gray points are not detected

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SLIDE 3

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

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

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SLIDE 4

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 1 9 9 1 -2 0 1 1 CASCO BAY TOTAL PESTI CI DES

Note: gray points are not detected

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SLIDE 5

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 GULF OF MAI NE

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SLIDE 6

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 GULF OF MAI NE METALS

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SLIDE 7

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 1 0 GULF OF MAI NE PAHS

* * : statistically significant difference in concentrations by area * *

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SLIDE 8

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 0 0 - 2 0 1 0 GULF OF MAI NE PAHS

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SLIDE 9

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

RESULTS: 2 0 0 0 - 2 0 1 0 GULF OF MAI NE

  • Add Lauren’s revised

version

10 100 1000 10000

Total PAHs (ng/g)

Casco Bay Gulf of Maine

Note: gray points are not detected

Casco Bay Casco Bay Great Bay Great Bay Great Bay

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SLIDE 10

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

SUMMARY

Chem ical Group Casco Bay 2 0 1 0 -2 0 1 1 Casco Bay 1 9 9 1 -2 0 1 1 Gulf of Maine ( GoM) Metals Below screening values* Declining/ stable, selenium? Consistent with GoM PAHs Below screening values Decline since 2000-2002 Lower than GoM Dioxins and Furans Concentrations are low Decline since 2000-2002 NA Butyltins Concentrations low, not detected Decline over all sampling events NA PCBs Rarely detected (elevated DL) Expected continued decline NA (rarely detected) Pesticides Rarely detected (elevated DL) Expected continued decline NA (rarely detected)

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SLIDE 11

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

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
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SLIDE 12

SEPTEMBER 14, 2016 SEDIMENT ASSESSMENT OF CASCO BAY (1991-2011)

THANK YOU