September 14, 2016 Presented by New Hampshire …Coakley Landfill Update September 14, 2016...

Coakley Landfill Update September 14, 2016

Presented by New Hampshire Department of

Environmental Services

PFOA/PFOS results 1,4-dioxane status & groundwater flow Information needs Area drinking water well review Summary of next steps

2

3

GREENLAND

North Hampton

Rye

Existing Subdivision

Proposed Subdivision

Existing Subdivision

Coakley Landfill

GMZ

Groundwater Management Zone (GMZ)

PFOA/PFOS Results

Presenter

Presentation Notes

This figure shows the results of the of the PFOA/PFOS analysis on samples collected from area wells. Results shown are the summation of PFOA and PFOS. Triangles represent monitoring wells associated with the Coakley Landfill and circles represent private drinking water wells. Red and orange identify sample locations that exceed the established AGQS of 70 ppt. Yellow and green show results that were below the AGQS. As you can see, the data do appear to confirm that the landfill is a source of PFCs with concentrations as high as 1,100 ppt. No residential wells sampled exceeded the standard. Only two wells had detections; one shown in yellow (the Golf Clubhouse water supply at 25 ppt PFOA) and another in this area with 8.1 ppt PFOS.

5

Groundwater Flow Direction

Coakley Landfill

GMZ

Information Needs

Groundwater Mngmnt Zone (GMZ)

Presenter

Presentation Notes

This figure shows the results of the of the PFOA/PFOS analysis on samples collected from area wells. Results shown are the summation of PFOA and PFOS. Triangles represent monitoring wells associated with the Coakley Landfill and circles represent private drinking water wells. Red and orange identify sample locations that exceed the established AGQS of 70 ppt. Yellow and green show results that were below the AGQS. As you can see, the data do appear to confirm that the landfill is a source of PFCs with concentrations as high as 1,100 ppt. No residential wells sampled exceeded the standard. Only two wells had detections; one shown in yellow (the Golf Clubhouse water supply at 25 ppt PFOA) and another in this area with 8.1 ppt PFOS.

Coakley Landfill

General ◦ Area well review (postcards to be mailed week of 9/19) ◦ Support EPA in further evaluation of PFOA/PFOS ◦ Surface water & sediment sampling for 1,4-dioxane &

PFOA/PFOS North of Landfill ◦ Residential well sampling to continue ◦ Compliance wells (demonstrate clean boundary) ◦ Water main extension to proposed subdivision ◦ Support Town of Greenland in sampling of residential wells

South of Landfill ◦ PRP-lead residential well sampling to continue ◦ Compliance wells to be identified

East of Landfill ◦ Confirm groundwater flow direction ◦ Evaluate next steps

12” Main

Bethany Church

Breakfast Hill Road

Proposed Subdivision

Existing Water Tower

Homes sampled in Stone Meadow Way neighborhood had no 1,4-dioxane detected.

September 14, 2016 Presented by New Hampshire …Coakley Landfill Update September 14, 2016...

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