EXPLAINING THE PATH AND FATE OF A FIRE-TRAINING AREA PFAS PLUME NEAR - - PowerPoint PPT Presentation

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EXPLAINING THE PATH AND FATE OF A FIRE-TRAINING AREA PFAS PLUME NEAR - - PowerPoint PPT Presentation

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EXPLAINING THE PATH AND FATE OF A FIRE-TRAINING AREA PFAS PLUME NEAR TWO CAPE COD LAKES: UNDERSTANDING GROUNDWATER-LAKE INTERACTIONS IS THE KEY Denis LeBlanc 1 J.K. Bhlke 2 Timothy McCobb 1 Andrea Tokranov 1,3 AFCEC Joint Base Cape Cod 4 1 USGS

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Federal Remediation Technology Roundtable November 7, 2018

EXPLAINING THE PATH AND FATE OF A FIRE-TRAINING AREA PFAS PLUME NEAR TWO CAPE COD LAKES: UNDERSTANDING GROUNDWATER-LAKE INTERACTIONS IS THE KEY

Denis LeBlanc1 J.K. Böhlke2 Timothy McCobb1 Andrea Tokranov1,3 AFCEC Joint Base Cape Cod4

1USGS New England WSC 2USGS Earth Systems Processes

Division

3Harvard University 4Air Force Civil Engineer Center

Support from Toxic Substances Hydrology Program Earth Systems Processes Division Air Force Civil Engineer Center Harvard University

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300 FEET

60 FT

3000 FEET

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Joint Base Cape Cod Plumes

2007

Solvents and Fuels Explosives and Perchlorate Extraction Well Injection Well or Infiltration Gallery 2 miles JBCC

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1 KM

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  • 10
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100

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Altitude, in feet

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Delta H-2 VOCs Delta O-18

NE SW

1 KM

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Lake seepage to groundwater Groundwater underflow from upgradient of lake VOCs

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Not for citation

  • r release

Evaporation makes lake water isotopically heavier

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Fire-Training Area 1 Joint Base Cape Cod

  • Operated from 1958 to 1985
  • PFAS-containing foams used

from about 1970 to 1985

2 km FTA-1 Ashumet Pond

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FTA-1 Ashumet Pond Johns Pond

A A’

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A A’

Ashumet Pond

Weber et al., 2017, ES&T

Total PFASs = 240 ng/L

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Total )

PFAS Plume Intersects Shore of Ashumet Pond

  • Mass flux across section

explains 25% of PFAS concentration in pond

  • Uncertainties:
  • simulated water flux
  • concentration interpolation
  • precursors
  • other sources

Total PFAS, ng/L FTA-1 GW Flow Section

viewer

NE SW Groundwater flow toward viewer 200 200 400 600 800 1,000 FEET 80 40

  • 40
  • 80

ALTITUDE, IN FEET

Not for citation

  • r

release

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Groundwater Inflow Lake Water Outflow Lake Water

680 ng/L 280 ng/L 240 ng/L

PFAS Plume Downgradient Groundwater

110-750 ng/L

150 Ft Ashumet Pond 50 cm below bottom 146 Ft

∑ PFAS, Sept. 2017

Not for citation

  • r release
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FTA-1

Ashumet Pond Quashnet River Johns Pond

Inferred area of lake shadow ? ? ? ? ?

Not for citation

  • r release
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Meters

PFASs Downgradient from Ashumet and Johns Ponds

July-Sept 2017 PFOS + PFOA > 70 ng/L

[EPA Health Advisory]

FTA-1 Ashumet Pond

PFAS plume 2015

Weber et al., 2017

Bedrock

Johns Pond Quashnet River 1 km

Regional Groundwater Flow

Water table Meters

Not for citation

  • r release
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delta 18O/2H May 2003

50 25

  • 25
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No PFOS + PFOA ng/L July 2017 VOCs

541 75 75 70 172 84 64 78 67 9 27 79 100 6 26 34 35

Johns Pond Quashnet River

Regional Groundwater Flow Bedrock

Water table Altitude, in meters

3000 3500 4000 4500 5000 5500 6000

Meters

Not for citation

  • r release
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PFASs Near Ashumet and Johns Ponds 2017

PFOS + PFOA > 70 ng/L

EPA Health Advisory

Groundwater Lake water River water

FTA-1

Ashumet Pond Johns Pond Quashnet River

Inferred area of lake shadow

? ? ? ? ?

Not for citation

  • r release

Results from USGS and AFCEC

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Other Identified Potential PFAS Sources on JBCC and Simulated Flow Paths to Lakes and Rivers

Source: AFCEC, August 2018 FTA-1

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Summary

  • Lakes are often an important part of groundwater systems
  • Groundwater flow near the lakes can affect plume paths

at local and regional scales

  • At Cape Cod the spreading of the FTA PFAS plume is

greatly increased by the lake/groundwater interactions

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For More Information

Installation Restoration Program at Joint Base Cape Cod Rose Forbes Air Force Civil Engineer Center rose.forbes@us.af.mil USGS Contacts Denis LeBlanc dleblanc@usgs.gov Andrea Tokranov andreaweber@fas.harvard.edu Larry Barber lbbarber@usgs.gov Cape Cod Toxic Substances Hydrology Project https://toxics.usgs.gov/investigations/ cape_cod/index.php Groundwater resources of Cape Cod https://ma.water.usgs.gov/projects/ capegwresources/ Cape Cod lakes and plumes Weber et al. (2017) PFAS plume: http://dx.doi.org/10.1021/acs.est.6b05573 McCobb et al. (2018) Plume/lake interaction: https://doi.org/10.1016/j.jenvman.2018.02.083 Stoliker et al. (2017) Plume/lake interaction: http://dx.doi.org/10.1021/acs.est.5b06155