Occurrence of Selected PFAS in Shallow Ambient Groundwater in the - - PowerPoint PPT Presentation

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occurrence of selected pfas in shallow ambient groundwater
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Occurrence of Selected PFAS in Shallow Ambient Groundwater in the - - PowerPoint PPT Presentation

Feb 10, 2023 20 likes •171 views

NJGWS 2018 Pil ilot Stu tudy: Occurrence of Selected PFAS in Shallow Ambient Groundwater in the Coastal Plain Physiographic Province of New Jersey Catherine Jedrzejczyk, PG Research Scientist New Jersey Geological & Water Survey (NJGWS)

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NJGWS 2018 Pil ilot Stu tudy: Occurrence of Selected PFAS in Shallow Ambient Groundwater in the Coastal Plain Physiographic Province of New Jersey

Catherine Jedrzejczyk, PG Research Scientist New Jersey Geological & Water Survey (NJGWS) Catherine.Jedrzejczyk@dep.nj.gov

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Groundwater sampling for PFAS was conducted by NJGWS in 2018

  • Pilot study to research PFAS occurrence in

shallow groundwater

  • Not prompted by any reported issue
  • Data for informational purposes only
  • Samples collected between March and June of 2018
  • 17 existing monitoring wells (MWs) from the NJ Ambient Groundwater Quality

Monitoring Network (AGWQMN)

  • Sampled using peristaltic pump and HDPE tubing
  • USGS monitoring well purging method
  • 3 volume purge with water quality parameter stabilization

NJDEP/DWSG/NJGWS - 2

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SLIDE 3
  • 17 AGWQMN monitoring wells in the Coastal

Plain Physiographic Province of NJ

  • Existing MWs typically sampled by NJGWS in

the south NJ sampling set initially selected

  • Selection not targeted
  • Other network MWs were substituted if water

level was too low or turbidity too high

  • Pumping depth to water < 25 ft bgs for peristaltic

pump to function

  • Targeted turbidity < 1 NTU (not achieved in all

samples)

NJDEP/DWSG/NJGWS - 2

Location

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SLIDE 4

General l PFAS-Sampling Considerations

Avoid cross-contamination

  • PFAS can potentially be found in many

commonly used products

  • Detection limits are very low
  • No PFAS-containing sampling equipment
  • r supplies
  • No fluoropolymer pump parts or tubing
  • Wash hands, clean gloves on before

sampling, avoid contact with sample water or inside of bottles

  • Collect equipment blanks

Limit sorption

  • Avoid use of LDPE and glass

in contact with sample

  • HDPE tubing

recommended

  • Lab-provided HDPE or

polypropylene sample bottles

NJDEP/DWSG/NJGWS - 4

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SLIDE 5

Potential Sources of f PFAS Avoided

Limited data available on impact of PFAS- containing products in the sampling environment so most guidance recommends erring on the side of caution To avoid:

  • Fluoropolymer-containing sampling

equipment and supplies

  • Water- or stain-resistant clothing and

footwear

  • Personal care products that contain PFAS
  • Stain-treated vehicle upholstery or carpet
  • Food wrappers and packaging, especially

greaseproof paper products

NJDEP/DWSG/NJGWS - 5

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Groundwater Sampling for PFAS

  • No PFAS-containing sampling equipment or supplies used
  • HDPE tubing and sample bottles to limit sorption
  • Care was taken to avoid cross-contamination while sampling
  • Avoided use of potentially PFAS-containing personal care products, clothing,

food wrappers

  • Handwashing in field with PFAS-free water
  • New gloves donned immediately before sampling and avoided contact with

sampled water and inside of sample bottle/cap

  • Equipment blanks and field blanks were collected

NJDEP/DWSG/NJGWS - 6

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SLIDE 7
  • NJ Department of Health Laboratory
  • EPA Method 537 rev 1.1
  • Determination of Selected Perfluorinated Alkyl Acids (PFAAs) in Drinking Water by Solid

Phase Extraction and Liquid Chromatography/Tandem Mass Spectrometry (LC/MS/MS)

  • Validated and approved by NJDEP Office of Quality Assurance
  • No approved method for non-potable water at the time of study design
  • Data for informational purposes only
  • 14 PFAS analytes:

Laboratory ry Analysis

NEtFOSAA NMeFOSAA PFBS PFHxS PFOS PFHxA PFHpA PFOA PFNA PFDA PFUnA PFDoA PFTrDA PFTA

NJDEP/DWSG/NJGWS - 7

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DRAFT

Of the 17 monitoring wells sampled:

  • 12 (71%) MWs with at least 1

PFAS detection above the Limit

  • f Quantitation (LOQ)
  • 11 (65%) MWs with multiple

PFAS detections

Detections

NJDEP/DWSG/NJGWS - 8

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SLIDE 9

Compound

Number of MWs with detections (above LOQ) Number of MWs with concentrations ≥ 5 ng/L reporting limit (RL) Maximum concentration detected in ng/L Maximum Contaminant Level (MCL) in ng/L Number of MW samples above MCL

PFNA 3 1 8.7 13 PFOA 11 9 23.6 14* 4 PFOS 10 4 9.2 13* PFHxS 2 2 18.3 PFHxA 9 6 12.5 PFHpA 4 4.9 J PFBS 10 3.1 J

Detected Compounds

NJDEP/DWSG/NJGWS - 9

Notes:

  • 1. Data for informational purposes only.
  • 2. J: Compound detected above limit of quantitation (LOQ) but below RL. Estimated value.
  • 3. * Proposed MCL
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SLIDE 10

NJDEP/DWSG/NJGWS - 10

Total PFAS Concentrations

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SLIDE 11

PFNA

NJDEP/DWSG/NJGWS - 11

Data for informational purposes only.

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SLIDE 12

PFOA

NJDEP/DWSG/NJGWS - 12

Data for informational purposes only.

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SLIDE 13

DRAFT

NJDEP/DWSG/NJGWS - 13

PFOS

Data for informational purposes only.

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SLIDE 14

Ongoin ing PFAS-rela lated Work at NJG JGWS

  • Data shared within NJ DEP
  • Working with United States Geological Survey (USGS) to develop sampling

plan for including PFAS in annual AGWQMN sampling

  • Planning to include sampling for PFAS in 2020 sampling event
  • 50 monitoring wells anticipated to be sampled in partnership with

Bureau of Freshwater and Biological Monitoring and USGS

  • Modifications to sampling method, analytical method, QA/QC

NJDEP/DWSG/NJGWS - 14

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Questions?

NJGWS -