Landfill Community Update · 1972-1985 Waste Deposited 1990 Record of Decision for Remedial Action...
Transcript of Landfill Community Update · 1972-1985 Waste Deposited 1990 Record of Decision for Remedial Action...
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Landfill Community Update
NEWHAMPSHIRE -,L" DEPARTMENT OF
Environmental ~~ Services
June 25, 2019
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Background History Applicable Standards and Screening Levels
Private Well Sampling
Ongoing and Completed Investigations Bedrock Fish Tissue Sampling Stormwater Sampling
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RYE
Grove Rd Landfill
Rye water tower
OU 2
OU 1
Coakley Landfi 11 Area
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1972-1985 Waste Deposited
1990 Record of Decision for Remedial Action
1998 Landfill Consolidated and Capped
2015 1,4-Dioxane Added as Site COC = 3.0 ppb
2016 PFAS Sampling Initiated
2016 EPA HA and DES AGQS for PFOA and PFOS = 70 ppt
As of 2017, Many Wells Meeting Most Site CLs
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Standards and Screening Levels at Coakley
Drinking water health advisory (HA) and AGQS PFOA and PFOS = 70 ppt in drinking water.
Screening levels (SLs) PFOA and PFOS = 760 ppt in surface water PFBS = 760,000 ppt in surface water PFOA and PFOS = 0.369 ppm in sediment PFBS = 369 ppm in sediment PFOA and PFOS = 5.21 ppb in fish tissue PFBS = 5,210 ppb in fish tissue
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PFAS - PFAS_Sample_Results_GW
PFOS_PFOA
400+ ppt
70 ppt - <399 ppt
45 ppt - <70 ppt
10 ppt - <45 ppt Coakley Landfill
Greenland
Rye
1. GMZ 2. PFAS in Site MWs 2016 3. Prompted area private
well sampling
North Hampton
Coakley Landfill
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,. LJ ·•-· _J• '._1 _.l
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Postcard Survey • Public water available • Not all properties
connected • Objective: to identify
& sample existing private wells
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Extended Sampling • Published offering for
private well sampling(PFAS + 1,4-dioxane)
• Multiple mobilizations • NHDES/EPA performed Trained personnel Contract labs Sample ready
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400+ ppt
70 ppt - <399 ppt
45 ppt - <70 ppt
10 ppt - <45 ppt
Rye Landfill Results (PFOA+PFOS)
• Summary
• Consistent with existing conceptual site model Grove Road
Landfill Groundwater flow Other contaminants
North Hampton • 1,4-Dioxane detections Fire Station
Detected in two wells Lowering of standard Treatment systems inst. Car Wash
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400+ ppt
70 ppt - <399 ppt
45 ppt - <70 ppt
10 ppt - <45 ppt
Biannual Sampling
• Site monitoring • Private well monitoring • Data trends
Private wells sampled biannually
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+PFOA+PFOS
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20
15
10
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-----------·-.-.PFOA+PFOS
-----------·-
Private wells sampled biannually
PFOA + PFOS Trend Summary • Private wells with
highest PFAS • 4 events suggest no
trend • Source?
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1,4-Dioxane BHR2
1 + 1,4-Dioxane
-"(-Q;r..,_"O '(-Qi..',;:◊
Month-Year
1 ... 1,4-Dioxane
1,4-Dioxane Trend Summary • Two private wells • Revised standard
shown 0.32 ppb • 6+ years of data • Steady state
Private wells sampled biannually
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Summary of Private Well Sampling Summary of Private Well Sampling
• Continued biannual sampling of site MWs and private wells.
• Data support limited off-site impacts. • Data suggest steady state (no trend) • Bedrock investigation will refine understanding of
bedrock flow and existing/potential off-site impacts.
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8 Surface Water Results
All locations downstream of landfill < 760 ppt in 2018
One location in immediate vicinity of landfill > 760 ppt SW-5 = 961 ppt PFOA SW-5 = 974 ppt PFOS
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Surface Water Results PFOS = 270 ppt PFOA = 335 ppt
PFOS = 974 ppt PFOA = 961 ppt PFOS = 62 ppt
PFOA = 88 ppt
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Investigation
Performed per May 31, 2018 Work Plan
Two-year schedule
Investigation initiated to: Understand flow pathways in bedrock Determine level of contamination in bedrock Assess contaminant migration in bedrock
groundwater to potential receptors
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Investigation
Surface geophysics
3 new bedrock wells installed
Borehole geophysics
Packer interval samples collected
9 historic bedrock wells redeveloped, surveyed, sampled
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♦ DEEP BEDROCK RECONNAISSANCE WELL
♦ DEEP BEDROCK INVESTIGATION WELL COUPLET
♦ PREVIOUSLY COMPLETED BOREHOLE GEOPHYSICS
COAKLEY LANDFILL SUPERFUND SITE FIGURE 1
CFB
NORTH HAMPTON & GREENLAND, NEW HAMPSHIRE OhllS 2019-06-18 REVOATE·
SHEETTITLE: JN APFROV:DB'r' ISSUC
DEEP BEDROCK RECONNAISSANCE WELL LOCATIONS 10424.016 MAD
SCALE: AS SHOWN
CHECKED8Y CFB
ISSUE OATE: CES1NC
Deep Bedrock Investigation Wells
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Results - 3 New Wells
MW-20 3 fracture zones sampled 1,4-dioxane detected in all 3 fracture zones at
0.4 ppb, 0.4 ppb and 0.41 ppb PFOA detected in one zone at 4.62 ppt MW-21 7 fracture zones sampled 1,4-dioxane detected in one zone at 0.55 ppb PFOA detected in one zone at 4.37 ppt MW-22 7 fracture zones sampled ND for 1,4-dioxane and PFAS
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Sampling Results – 3 New Wells
PFOA = 4.37 ppt 1,4 Dioxane = 0.55ppb
PFOA = 4.62 ppt 1,4 Dioxane = 0.41ppb
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Wells
11 historic bedrock wells located
9 redeveloped and surveyed
Sampling at 9 wells completed in June, including sampling from ≈ 50 fracture zones
Results used to refine Conceptual Site Model
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Next Steps
Bedrock Investigation Tech Memo fall 2019 Update Conceptual Site Model Address Data Gaps Pumping Test Installation of Additional Bedrock Wells
USGS Model Development
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Tissue Sampling
Berrys Brook fish samples collected in June 2018 Lafayette Road Lang Road Sagamore Road Upstream of Brackett Road Berrys Brook estuary
Eel, Shiner, Pickeral and Brown Trout
PFOA, PFOS and PFNA were detected
PFOS = 19.2 ppb (ng/g) in Eel at Lafayette Road; SL = 5.21 ppb
Brown Trout = 6.1 ppb PFOS
EPA conducted risk assessment and determined no unacceptable risk from consumption of fish
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Blunts Island
Brackett Rd
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Sampling
Sample collected from groundwater seep appeared to be mixing with stormwater runoff
April 2018, CLG initiated additional sampling to segregate stormwater runoff
Based on results, EPA directed additional sampling of runoff and cap materials
Samples collected in fall 2018 and spring 2019
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www.epa.gov/superfund / coakley
-.r ::~~~~: Environmental
~~ Services
Andrew Hoffman, P.E. Richard Hull NH Department of Environmental U.S. EPA - New England, Region 1 Services Tel. (617) 918-1882 Tel. (603) 271-4060 E-mail: [email protected] E-mail: [email protected]
Kelsey Dumville U.S. EPA - New England, Region 1 Tel. (617) 918-1003 E-mail: [email protected]
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