Camp Davis (MCOLF) –
Site 111 PFAS Review
January 2026 RAB Summary & Aquifer Comparison
The January 2026 Restoration Advisory Board (RAB) minutes document elevated PFAS concentrations in shallow groundwater monitoring wells at Site 111.
The highest reported PFOS concentration was 29,200 ng/L in the surficial aquifer,
7300 times the EPA Limit for drinking water.
Reported concentrations in the deeper Castle Hayne aquifers remain below EPA’s 4 ng/L drinking water standard.
The RAB minutes also summarize modeled future residential and construction worker cumulative exposure scenarios that exceeded target risk thresholds when exposures across multiple environmental media were combined.
Lower Castle Hayne Aquifer
Reported values remain below the federal drinking water standard in January 2026 documentation.
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PFOS: 1.64 ng/L
→ 41% of EPA’s 4 ng/L limit
Upper Castle Hayne Aquifer
(Deeper Groundwater)
Reported values remain below the federal drinking water standard in January 2026 documentation.
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PFOS: 1.63 ng/L
→ 40.75% of EPA’s 4 ng/L limit -
PFOA: 3.06 ng/L
→ 76.5% of EPA’s 4 ng/L limit
Surficial Aquifer
(Shallow Groundwater Monitoring Wells)
These concentrations were measured in shallow monitoring wells within the surficial aquifer. They are not reported residential drinking water supply wells. The EPA 4 ng/L standard applies to finished drinking water, not environmental monitoring wells.
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PFOS: 29,200 ng/L
Approximately 7,300 times the EPA’s 4 ng/L drinking water standard. -
PFOA: 849 ng/L
→ 21,225% of EPA’s 4 ng/L drinking water limit
(212× the federal standard)
All concentration values drawn from
January 2026 RAB meeting minutes.
Shallow vs.
Deep Aquifer Results
EPA’s 4 ng/L standard applies to finished drinking water. The shallow groundwater results above were recorded in monitoring wells used for environmental investigation.
The January 2026 RAB minutes state that future residential potable groundwater use scenarios could exceed target risk levels.
They also state that future construction worker cumulative exposure to combined soil, shallow groundwater, and surface water could exceed non-cancer hazard thresholds.
Individual exposure pathways alone did not exceed target levels; cumulative exposure across multiple pathways did.
Conceptual aquifer cross-section illustrating shallow (surficial) and deeper (Castle Hayne) groundwater zones.
Concentration values shown are drawn from January 2026 RAB meeting minutes.
Elevated PFAS concentrations were documented in shallow monitoring wells, while reported values in the deeper aquifer remained below EPA’s 4 ng/L drinking water standard.
SafeHollyRidge.org publishes information drawn directly from publicly available records and official meeting minutes. This page will be updated as new documents are released.
According to the January 2026 Restoration Advisory Board (RAB) minutes:
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Elevated PFAS concentrations have been documented in shallow (surficial) groundwater monitoring wells at Site 111.
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Reported concentrations in the deeper Castle Hayne aquifers remain below EPA’s 4 ng/L drinking water standard in the most recent documented sampling.
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The Remedial Investigation (RI) process is ongoing.
Ongoing Investigation
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Monitoring remains active.
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Remedial options are being evaluated for the shallow groundwater system.
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Deeper aquifer sampling continues to assess long-term protection of regional drinking water sources.
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Updates will be incorporated into this page as official documentation becomes available.
What This Means Going Forward
The RAB minutes indicate:
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A pilot in-situ treatment study is planned for the shallow aquifer.
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Continued groundwater monitoring is occurring across multiple aquifer zones.
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Additional data collection and evaluation are part of the RI process.
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A final Remedial Investigation report is anticipated but has not yet been released.