Site updates
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This
operational update covers only Section 2—response actions and planning
information. For all other static information, please refer to Operational
Period #1 in the document section of this website.
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Operational Period 4: October 5
–October 11, 2026
Excavation
continued within Zone 3, with approximately 1,288 cubic yards of contaminated
material removed during the reporting week, bringing the cumulative
excavation total to approximately 2,485 cubic yards. Oil continued to seep
from exposed soils and accumulate in extraction pits and pooled groundwater.
Work included continued NAPL and impacted-groundwater recovery, backfilling
of the northern portion of the excavation, and beginning demolition of the
former Shop Annex to provide access to contaminated soils.
EPA
- Continued oversight of excavation, material segregation,
liquid recovery, and backfill activities within Zone 3.
- Evaluated field conditions as excavation exposed continued
oil seepage from excavation sidewalls and oil-saturated soils near the
former Shop Annex and pump house.
- Continued evaluating the extent of contamination around
former fuel-transfer infrastructure. Field observations identified
piping connecting the pump house and tank farm as a potential source of
oil contamination.
- Advanced removal activities into areas requiring demolition
of the former Shop Annex to access contaminated soils beneath and
adjacent to the structure.
ERRS
- Excavated approximately 1,288 cubic yards of contaminated
material within Zone 3, bringing the cumulative excavation total for the
current removal effort to approximately 2,485 cubic yards.
- Removed overlying material identified as clean soil before
excavating underlying contaminated material.
- Segregated and staged excavated soils according to
contamination density. Expanded contaminated-soil staging capacity
beneath the west drip-pad cover and continued using covered staging
space within the west-side barn.
- Continued recovering oil and impacted groundwater from
extraction pits and pooled areas within the excavation.
- Pumped approximately 3,500 gallons of impacted groundwater.
Recovered liquids passed through an oil-water separator, with water
routed to a weir tank for accumulation before transfer to onsite frac
tanks.
- Backfilled an existing test pit following oil-recovery
efforts and excavated another test pit closer to the southern end of the
excavation on October 8. Floating oil (NAPL) was identified.
- Continued excavation near the Shop Annex and pump house,
exposing a storm drain surrounded by oil-saturated soils.
- Placed a demarcation barrier in a portion of the Zone 3
excavation in preparation for backfill. Began gravel backfilling in the
northern portion of the excavation.
- Began demolition of the former Shop Annex to provide access
to contaminated soils. Demolition remained in progress.
- Staged removed metal for recycling.
START
- Conducted daily air monitoring for volatile organic
compounds and particulates at AM03, AM07, AM08, AM10, and AM11.
- Supported oversight of excavation and segregation of removed
soils into appropriate waste streams.
- Documented excavation progress, oil seepage, test-pit
conditions, demolition, and backfill activities through photographic
records and excavation mapping.
- Updated excavation and water-management quantity logs.
USCG
Pacific Strike Team
- Two USCG personnel were
reported onsite during the operational period. Specific activities were
not detailed in the START weekly summary.
2.1.3
Progress Metrics

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Materials Management
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Operational Period 4
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Cumulative*
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Contaminated material excavated
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1,288 cubic yards
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2,485 cubic yards
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Impacted water recovered and managed onsite
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3,500 gallons
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8,100 gallons
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*Cumulative quantities reflect the excavation and
water-recovery effort beginning in September 2026. Water quantities do not
represent a separately measured volume of recovered NAPL.

Excavation
and backfill by day

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2.2
Planning Section
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2.2.1 Anticipated Activities:
Operational
Period 4: October 12–18, 2026
- Continue excavation within Zone 3, adjusting excavation
sequencing and backfill timing based on subsurface conditions and
liquid-recovery needs.
- Continue recovering NAPL and impacted groundwater from
extraction pits and pooled areas, modifying recovery arrangements as
excavation progresses.
- Continue managing recovered liquids through the oil-water
separator and onsite tank system.
- Begin collecting water samples from the extraction pits and
soil samples along excavation boundaries.
- Begin air sampling within the material-storage and
soil-stockpile areas, within the excavation area, and along the site
fence-line perimeter.
- Continue Shop Annex demolition as needed to provide access
to contaminated soils beneath and adjacent to the structure.
- Evaluate exposed drainage and former fuel-transfer piping to
guide excavation and management of associated contaminated material.
- Continue placing demarcation barriers and backfilling
selected excavated areas.
- Continue managing contaminated-soil staging capacity and
segregating materials into appropriate waste streams.
- Continue routine air monitoring and field documentation to
support excavation and material-management decisions.
2.2.2 Next Steps / Long-Term
Planning
EPA will evaluate continued NAPL
accumulation and groundwater recovery to determine whether additional or
modified recovery systems are warranted during the removal action. Excavation
observations will inform excavation limits and management of contaminated
material around former structures, drainage features, and fuel-transfer
piping.
EPA will direct test pits
throughout the west size of zone 3 to identify contaminated soils and
evaluate groundwater and NAPL impacts.
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