FINAL

Preliminary Assessment Report

Army Aviation Support Facility #1

Salem, Oregon

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic 

Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

August 2019

Prepared for:

Army National Guard Headquarter

111 S. George Mason Drive

Arlington, VA 22204

U.S. Army Corps of Engineers, Baltimore District

2 Hopkins Plaza

Baltimore, MD 21201

Prepared by:

AECOM

12420 Milestone Center Drive, Suite 150

Germantown, MD 20876

aecom.com

Contract Number: W912DR-12-D-0014

Delivery Order: W912DR17F0192
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

i

Table of Contents

Executive Summary ....................................................................................................................1

1. Introduction ........................................................................................................................4

Authority and Purpose ..............................................................................................4

Preliminary Assessment Methods .............................................................................4

Report Organization ..................................................................................................5

Facility Location and Description...............................................................................5

Facility Environmental Setting ...................................................................................6

1.5.1 Geology .........................................................................................................6

1.5.2 Hydrogeology .................................................................................................6

1.5.3 Hydrology .......................................................................................................7

1.5.4 Climate ...........................................................................................................7

1.5.5 Current and Future Land Use .........................................................................8

2. Fire Training Areas ...........................................................................................................12

FTA 01 – Stormwater Detention Pond .....................................................................12

FTA 02 – Open Field ...............................................................................................12

FTA 03 – Helicopter Training Area ...........................................................................13

Aircraft Maintenance Building .................................................................................13

3. Non-Fire Training Areas ...................................................................................................15

Hangar 2 .................................................................................................................15

Former Chrome Plating Facility ...............................................................................15

Wash Pads .............................................................................................................16

Fuel Shed ...............................................................................................................16

Ramp Area ..............................................................................................................16

Landfills ..................................................................................................................17

4. Emergency Response Areas ............................................................................................19

5. Adjacent Sources .............................................................................................................20

Salem Fire Department #6 ......................................................................................20

Salem Airport Joint Training Area ............................................................................20

6. Conceptual Site Model .....................................................................................................22

AOI 1 Former FTAs .................................................................................................22

AOI 2 Non-FTAs......................................................................................................23

7. Conclusions .....................................................................................................................27

Findings ..................................................................................................................27

Uncertainty .............................................................................................................27

Potential Future Actions ..........................................................................................29

8. References ......................................................................................................................31
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

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Tables

Table ES-1: AOIs at Salem AASF #1

Table 7-1: AOIs at Salem AASF #1

Table 7-2: No Suspected Release Areas

Table 7-3: Uncertainties

Table 7-4: PA Findings Summary

Figures

Figure ES-1 Summary of Findings

Figure ES-2 Conceptual Site Model AOI 1 and AOI 2

Figure 1-1 Facility Location

Figure 1-2 Groundwater Features

Figure 1-3 Surface Water Features

Figure 2-1 Fire Training Areas

Figure 3-1 Non-Fire Training Areas

Figure 5-1 Adjacent Sources

Figure 6-1 Areas of Interest

Figure 6-2 Conceptual Site Model AOI 1 and AOI 2

Figure 7-1 Summary of Findings

Appendices

Appendix A Data Resources

Appendix B Preliminary Assessment Documentation

B.1 Interview Records

B.2 Visual Site Inspection Checklists

B.3 Conceptual Site Model Information

Appendix C Photographic Log
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

iii

Acronyms and Abbreviations

AASF Army Aviation Support Facility

AECOM AECOM Technical Services, Inc.

AFFF aqueous film forming foam

AOI Area of Interest

ARNG Army National Guard

CERCLA Comprehensive Environmental Response, Compensation, and Liability

Act

CSM conceptual site model

DRMO Defense Reutilization and Marketing Office

FTA fire training area

m meters

ORARNG Oregon Army National Guard

OWS oil water separator

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

PIL Pollutant Initiation Levels

SI Site Inspection

US United States

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

VSI visual site inspection

WWTP waste water treatment plant
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

1

Executive Summary

The United States (US) Army Corps of Engineers (USACE) Baltimore District on behalf of the

Army National Guard (ARNG)-Installations & Environment Division, Cleanup Branch contracted

AECOM Technical Services, Inc. (AECOM) to perform Preliminary Assessments (PAs) and Site

Inspections (SIs) for Perfluorooctanesulfonic acid (PFOS) and Perfluorooctanoic acid (PFOA)

Impacted Sites at ARNG Facilities Nationwide. The ARNG is assessing potential effects on

human health related to processes at facilities that used per- and poly-fluoroalkyl substances

(PFAS), primarily in the form of aqueous film forming foam (AFFF) released as part of

firefighting activities, although other PFAS sources are possible.

AECOM completed a PA for PFAS at the Army Aviation Support Facility #1 (AASF) in Salem,

Oregon, to assess potential PFAS release areas and exposure pathways to receptors. The

performance of this PA included the following tasks:

· Reviewed data resources to obtain information relevant to suspected PFAS releases

· Conducted a site visit on 10 September 2018

· Interviewed current Oregon Army National Guard (ORARNG) AASF personnel during the

site visit and ORARNG environmental managers and operations staff

· Completed visual site inspections at known or suspected PFAS release locations and

documented with photographs

· Developed a conceptual site model to outline the potential release and pathway of PFAS for

the Area(s) of Interest (AOIs) and the facility (Figure ES-1)

Two AOIs related to a PFAS release were identified at the Salem AASF during the PA. The AOIs

are shown on Figure ES-1 and are described below:

Table ES-1-1: AOIs at Salem AASF #1

Area of Interest Name Used by Potential Release

Dates

AOI 1 Former FTAs ORARNG & Salem

Fire Department ~1989-2017

AOI 2 Non-FTAs ORARNG & Eyerly

Aircraft Company ~1940s-2017

Based on actual and potential AFFF release at these AOIs, there is a potential for exposure to

PFAS contamination in surface soil, intermittent surface water, and sediments to site and

construction workers via ingestion and inhalation of dust; subsurface soil to site and 

construction workers via ingestion; and surface water, sediments, and groundwater to off-Post

residents and recreational users via ingestion. Based on groundwater and surface water flow

patterns, identified adjacent sources are not anticipated to have an impact on the Salem AASF.

The conceptual site model for the Salem AASF is shown on Figures ES-2.
Aircraft Maintenance Building

FTA 01 

Stormwater 

FTA 02 Open Field Detention Pond

Wash Pad

FTA 03 

Helicopter 

Training Area

Salem FD #6

Former Chrome Plating Facility

Hangar 2

Joint Training Area

Fuel Shed

Former Wash Pad

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

AOI 2

AOI 1

Mill Creek

Blue

Gill

Lake

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

5/30/2019

5/30/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

5/30/2019

1:8,400 ­ Figure ES-1

PM RG 5/30/2019

12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

Base Map: Source: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_ES-1_Salem_Summary.mxd

0 350 700 1,400

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

River/Stream

Canal/Ditch

2
Media

SOURCE PATHWAY RE

AOI 1 & AOI 

2

Fire Training 

Areas; Drainage 

Ditch; Wash Pad; 

Ramp and 

Storage Areas

PFAS in 

Surface Soil

PFAS in 

Subsurface 

Soil

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ Infiltration

Airborne Soil 

particulate

Surface Soil 

at AOI

Surface 

Water/ 

sediment

Subsurface 

Soil

Shallow 

Groundwater

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

IngestionIngestion

Ingestion

Ingestion

Hum

C

Flow-Chart ContinuesPartial / Possible FlowFlow-Chart StopsIncomplete PathwayPotentially Complete PathwayComplete Pathway

Site 

Worker

Cons

W

Site 

Worker

Cons

W

LEGEND

Figure E

Conceptual Si

AOI 1 and 

Salem AA

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

/ / / / 

/ 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

4

1. Introduction

Authority and Purpose

The United States (US) Army Corps of Engineers (USACE) Baltimore District on behalf of the 

Army National Guard (ARNG)-Installations & Environment Division , Cleanup Branch contracted 

AECOM Technical Services, Inc. (AECOM) to perform Preliminary Assessments (PAs) and Site 

Inspections (SIs) for Perfluorooctanesulfonic acid (PFOS) and Perfluorooctanoic acid (PFOA) 

Impacted Sites at ARNG Facilities Nationwide under Contract Number W912DR-12-D-0014, 

Task Order W912DR17F0192, issued 11 August 2017, and Modification 01 issued 30 

September 2017. The ARNG is assessing potential effects on human health related to 

processes at facilities that used per- and poly-fluoroalkyl substances (PFAS), primarily in the 

form of aqueous film forming foam (AFFF) released as part of firefighting activities, although 

other PFAS sources are possible. In addition, the ARNG is assessing businesses or operations 

adjacent to the ARNG facility (not under the control of ARNG) that could potentially be 

responsible for a PFAS release. 

PFAS are classified as emerging environmental contaminants that are garnering increasing 

regulatory interest due to their potential risks to human health and the environment. PFAS 

formulations contain highly diverse mixtures of compounds. Thus, the fate of PFAS compounds 

in the environment varies. The regulatory framework at both federal and state levels continues 

to evolve. The US Environmental Protection Agency (USEPA) issued Drinking Water Health 

Advisories for PFOA and PFOS in May 2016, but there are currently no promulgated national 

standards regulating PFAS in drinking water. In the absence of federal maximum contaminant 

levels, some states have adopted their own drinking water standards for PFAS. The Oregon 

Department of Environmental Quality has set Pollutant Initiation Levels (PILs) for PFAS/PFOA, 

which are not water quality standards (DEQ, 2017). According to OAR 340-045-0100, only 

facilities that operate under National Pollution Discharge Elimination System and Water 

Pollution Control Facility permits in Oregon are required to analyze effluent for PFAS/PFOA and 

report concentrations that exceed the PILs.

This report presents findings of a PA for PFAS at the Army Aviation Support Facility #1 (AASF) 

in Salem, Oregon, in accordance with the Comprehensive Environmental Response, 

Compensation, and Liability Act (CERCLA), as amended, the National Oil and Hazardous 

Substances Pollution Contingency Plan (40 Code of Federal Regulations Part 300), and USACE 

requirements and guidance. 

This PA documents the known fire training areas (FTAs) as well as other locations where PFAS 

may have been released into the environment at the AASF. The term PFAS will be used 

throughout this report to encompass all PFAS chemicals being evaluated, including PFOS and 

PFOA, which are key components of AFFF.

Preliminary Assessment Methods

The performance of this PA included the following tasks: 

· Reviewed data resources to obtain information relevant to suspected PFAS releases

· Conducted a site visit on 10 and 13 September, 2018

· Interviewed current Oregon Army National Guard (ORARNG) AASF personnel during the 

site visit including ORARNG environmental managers and operations staff
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

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· Completed visual site inspections (VSIs) at known or suspected PFAS release locations 

and documented with photographs 

· Developed a conceptual site model (CSM) to outline the potential release and pathway of 

PFAS for the Area(s) of Interest (AOIs) and the facility

Report Organization

This report has been prepared in accordance with the USEPA Guidance for Performing 

Preliminary Assessments under CERCLA (USEPA, 1991). The report sections and descriptions 

of each are:

· Section 1 – Introduction: identifies the project purpose and authority and describes the 

facility location, environmental setting, and methods used to complete the PA

· Section 2 – Fire Training Areas: describes the FTAs at the facility identified during the site 

visit 

· Section 3 – Non-Fire Training Areas: describes other locations of PFAS releases at the 

facility identified during the site visit 

· Section 4 – Emergency Response Areas: describes areas of AFFF release at the facility, 

specifically in response to emergency situations 

· Section 5 – Adjacent Sources: describes sources of PFAS release adjacent to the facility 

that are not under the control of ARNG 

· Section 6 – Conceptual Site Model: describes the pathways of PFAS transport and 

receptors for the AOIs and the facility 

· Section 7 – Conclusions: summarizes the data findings and presents the conclusions of 

the PA 

· Section 8 – References: provides the references used to develop this document

· Appendix A – Data Resources

· Appendix B – Preliminary Assessment Documentation

· Appendix C – Photographic Log

Facility Location and Description

The AASF is an approximately 81.5 acre facility located in Salem, Oregon (Figure 1-1) along 

the northeast end of Runway 16/34 of the McNary Field Salem Municipal Airport in Marion 

County. The AASF lies approximately 3.1 miles southwest of downtown Salem, 48 miles 

southeast of Portland, and 60 miles northeast of Eugene. Interstate 5 (I-5), traveling in a northsouth direction, is 0.5 miles east and state Highway 22, traveling east-west, is 0.5 miles to the 

north. The geographic coordinates are 44°54’42.6”N and 122°59’51.6”W.

Originally occupied by the Salem Airport from 1930 to 1940, the property was purchased and 

owned by the US Navy until 1971, when the Oregon Military Department purchased the property 

(OMD, 2008). Construction of the three hangars lasted from 1971 – 1973. In 2010, ORARNG 

acquired a former carnival equipment production facility, previously owned and operated by 

Eyerly Aircraft Company, directly east of Hangar 2 and south of Hangar 1. This acquisition 

consisted of 4.56 acres where the previous Eyerly property was located and expanded the 

property boundary of the AASF. 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

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Facility Environmental Setting

Marion County is a predominantly urban area in the Willamette Valley physiographic province, 

an area that holds nearly 70 percent of Oregon’s population. The region extends northward to 

Washington State and is bound by the Coast Range to the west, the Western Cascade Range 

to the east, and the Calapooya Mountains to the south. The county has an approximate total 

area of 1,193 square miles, of which only 10 square miles are water. The closest residence is 

one mile away and a shopping center exists a few hundred feet to the east on the other side of 

the AASF. Anleny National Wildlife Refuge lies three miles to the southeast of the AASF. 

Portions of the Willamette and Mount Hood National Forests are contained within Marion 

County, approximately 30 miles east of the AASF. Wildlife in this area and in vicinity to the AASF 

includes white tail deer, squirrels, raccoons, and numerous species of birds. The terrain within 

the valley and flood plain is of low to moderate relief, ranging from 150 to 1000 feet of elevation. 

1.5.1 Geology

Salem and the AASF lie in the Willamette Valley physiographic province, a drainage basin that 

is roughly 170 miles long from north to south and encompasses nearly 12,000 square miles. 

The Willamette River basin has considerable diversity in its land forms, and may be subdivided 

further into three coextensive physiographic sections with respect to major surface features: (1) 

The Oregon Coast Range section, (2), Puget Trough Section, and (3), the Middle Cascade 

Mountains lowlands section, which includes about 60% of the basin (Piper, 1942) and is where 

the AASF is located.

This lowland area belongs to the main valley plain, and is characterized by gently rolling 

topography traversed by steep-walled, flat-floored stream valleys. The Willamette valley has 

been a topographic low for at least 15 million years and was prone to frequent flooding (the 

Missoula Flood), due to the extensive braided channel systems of this area, which deposited 

Miocene and Pliocene sediments in the basin bottoms to Quaternary and late Tertiary-age 

sediments in the upper 0-100 meters (m) that are primarily coarse-grained sediment and gravel 

(Woodward, Gannett & Vaccaro, 1998). 

Due to this flooding, change of river flow direction, erosion, and deposition from surrounding 

tributaries of the mountain ranges, the thicknesses and age of these deposits can vary widely 

along the valley floor. The AASF is an area of coalesced alluvial fans underlain by 14 m of 12.7 -

15 thousand year old unconsolidated Holocene flood deposits, 200 - 300 m of Pleistocene age 

sand and gravel, the 40 m thick Willamette Silt layer (fine-grained Missoula Flood Deposits and 

clay) which thins towards the south, and another 100 - 200 m of Pleistocene age coarse sand 

and gravel of roughly 28 thousand years of age (O’Connor et al., 2001). Below this, basalt flows 

from the Columbia River Group ranging from 3 to 300 m thick slope westward and overlie 

marine rocks and the Little Butte Volcanic Series (Hampton, 1972). 

1.5.2 Hydrogeology

Regional and local groundwater flow follows a relatively simple drainage pattern which is 

facilitated by the topographic and structural trough of the Willamette Valley, which lies between 

the Coast Range and Cascade Range. Groundwater flows from these divides of high elevation 

to the lowland valley and discharges into the larger streams and rivers. The direction of 

groundwater flow is generally west/northwest towards Mill Creek, a tributary of the Willamette 

River, and several surrounding lakes (Figure 1-2). The unconsolidated, highly permeable soils 

create a shallow groundwater subsystem with a good hydraulic connection between the aquifers 

and streams (Woodward, Gannett, and Vaccaro, 1998). Depth to groundwater in the vicinity 

surrounding the facility typically ranges from 12 to 25 bgs (ORWRD, 2018). This provides a 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

7

system of high infiltration for recharge of groundwater. Groundwater discharges to the smaller

streams, which usually flow on the less permeable Willamette Silt unit and most discharge is

derived from runoff and snow melt (Hampton, 1972). The majority of recharge to the aquifers

occurs in the winter months, where precipitation and snowmelt are high and evapotranspiration

is low. The summer months are characterized by low precipitation, high runoff due to

urbanization, and high evapotranspiration (USGS, 1998).

This recharge supplies the major aquifers of the Willamette Basin. The Willamette Valley

comprises two major aquifers, and 3 confining units, created by the unique topographic and

stratigraphic lowland plain resting between two mountain ranges. The town of Salem is

underlain by parts of all five hydrogeological units (Hampton, 1972; Woodward, Gannett, and

Vaccaro, 1998). The majority of the AASF lies on the Willamette aquifer, which is the principal

aquifer for the Willamette Valley and lowland area (Conlon et. al., 2005). Large diameter wells in

the area, one 0.25 miles to the east-southeast and one 1.8 miles northeast of the AASF, can get

upwards of 10,000 gallons per minute.

Approximately two miles southwest of the AASF are several aquifer storage and recovery wells

located 350 feet bgs at Woodmansee Park (City of Salem, 2018). Treated drinking water from

the North Santiam River, approximately 20 miles east of AASF, is injected into a fractured basalt

aquifer. During the winter months, treated drinking water is pumped into this aquifer and

withdrawn during summer months as needed (USCHPPM, 2002).

1.5.3 Hydrology

The AASF is located within the Middle Willamette Watershed. In general, surface water in the

area surrounding the facility flows in the same west/northwest direction as groundwater, towards

Mills Creek, a tributary of the Willamette River (Figure 1-3). Surface water with the AASF flows

towards a grated storm drain system, which is located on the paved western edge of the facility.

Stormwater and surface water runoff are directed into two stormwater detention ponds which

discharge to Mission Ditch, just outside the southeast boundary of the facility. Mission Ditch then

flows west/northwest and discharges into Pringle Creek, a tributary of the Willamette River

(USCHPPM, 2002).

Wastewater in and around the AASF is collected through a series of sanitary sewers, which then

transfer wastewater to the Willow Lake Waste Water Treatment Plant (WWTP). This WWTP, 11

miles north of the AASF, treats approximately 30 million gallons of waste water per day.

Approximately one million gallons of treated water are used daily for irrigation and internal plant

operations, while the remaining treated wastewater is routed to a stormwater outfall, which

discharges to the Willamette River.

Drinking water at the AASF is supplied by the City of Salem. The North Santiam River provides

drinking water to the City of Salem as well as the nearby City of Turner. Due to the lack of

development and high regulation of land within the North Santiam Watershed, water quality

within this watershed is extremely high, with little treatment necessary to provide clean drinking

water. Slow Sand Filtration processes are utilized at the Geren Island Water Treatment Facility,

approximately 18 miles southeast of the AASF (USCHPPM, 2002). Water is then transferred to

the City of Salem and stored within 17 reservoirs around the City. No surface water intakes are

located within 15 miles of the AASF; however, several nearby private residential wells are

located within a mile downgradient of the AASF.

1.5.4 Climate

The AASF is situated in the Willamette Valley physiographic province. Temperatures are

moderated year round by winds and rains that come up and over the Coast Ranges to the east
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

8

from the Pacific Ocean. Annual rainfall is high, with 80% falling from October through March and

less than 5% falling in June and August, the peak growing season (Conlon et. al., 2005). The

average rainfall is around 40 inches near the AASF, with some localized areas slightly north

getting upwards of 70 inches.

1.5.5 Current and Future Land Use

Presently, the AASF includes 58 acres of dedicated-use military taxiway with the remaining 23.5

acres comprising the three active hangars, aviation fueling facilities, a hazardous material

storage facility, vehicle and aircraft parking aprons, and grass-covered areas (AMEC, 2006; 

OMD, 2008). The AASF supports the Medical Evacuation Battalion and the Theatre Aviation

Battalion with associated companies, whose purpose is to provide aircraft movement to support

medical evacuation, provide command, control and communications, provide organic airlift, and

partake in counter drug operations and organizational support aircraft operations (OMD, 2008).

Future land use is not anticipated to change.
McNary Field Salem AASF

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

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TK

1/2/2019

1/2/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:63,360

1/2/2019 ­ Figure 1-1

PM RG 1/2/2019

12420 Milestone Center Drive

Germantown, MD 20876

Facility Location

Base Map: Sources: Esri, HERE, DeLorme, USGS,

Intermap, increment P Corp., NRCAN, Esri Japan, METI,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_1-1_Salem_Facility_Location.mxd

^_

0 0.5 1 2

Miles

Legend

Facility Boundary

9
A!

A!

A!

A!

A!

!5

!5

!P

Mill Creek

Shelton Ditch

Pringle Creek

Mission Ditch

Clark Creek

Wirth

Lake

Blue

Gill

Lake

Stone

Quarry

Lake

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

1/2/2019

1/2/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:31,680

1/2/2019 ­ Figure 1-2

PM RG 1/2/2019

12420 Milestone Center Drive

Germantown, MD 20876

Groundwater Features

Base Map: Sources: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_1-2_Salem_Groundwater.mxd

0 0.25 0.5 1

Miles

Legend

Facility Boundary

Water Body

River/Stream

Canal/Ditch

Inferred

Groundwater Flow

Direction

Geology

Basalt

Clay or Mud

Siltstone

Well

!P Domestic

!5 Irrigation

A! Monitoring Well

A! Other Well

10
Upper Little

Pudding River

Watershed

Lower Mill

Creek

Watershed

Croisan

Creek-Willamette

River Watershed

Glenn

Creek-Willamette

River Watershed

Mill Creek

Shelton Ditch

Pringle Creek

Mission Ditch

Clark Creek

Wirth

Lake

Blue

Gill

Lake

Stone

Quarry

Lake

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

1/2/2019

1/2/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:31,680

1/2/2019 ­ Figure 1-3

PM RG 1/2/2019

12420 Milestone Center Drive

Germantown, MD 20876

Surface Water Features

Base Map: Sources: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_1-3_Salem_Surface_Water.mxd

0 0.25 0.5 1

Miles

Legend

Facility Boundary

Water Body

River/Stream

Canal/Ditch

Surface Water Flow

Direction

11
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

12

2. Fire Training Areas

Four FTAs were identified within the current AASF facility during the PA through interviews. 

These FTAs are described below and shown in Figure 2-1.

FTA 01 – Stormwater Detention Pond

FTA 01 is one of two stormwater retention ponds located west of Hangar 2, across the paved 

aircraft parking area. Annual fire training would occur at this designated location in which 

approximately one gallon of 3% concentrated AFFF from each of the six TriMax 30 tanks would 

be dispensed in this detention pond. This training was intended to teach personnel how to 

operate the nozzles on the TriMax 30 tanks. Additionally, it was noted during interviews that 

personnel at the AASF along with personnel from the City of Salem fire department would 

conduct annual controlled barrel burns within this stormwater detention pond. Wood and other 

organic debris would be burned in 55-gallon drums and extinguished using non-PFAS 

containing portable fire extinguishers (either Class A or Class ABC fire extinguishers). 

Interviewees stated both the TriMax dispensing training and the controlled barrel burns occurred 

annually for at least fifteen to twenty years, with the last training event occurring in December 

2017; however, it is unsure the exact year these barrel burns began. These trainings were 

intended to show personnel how to properly use the nozzles on the TriMax tanks and the nonPFAS containing portable fire extinguishers. 

Both stormwater detention ponds collect surface water and stormwater from within the facility in 

underground drainage basins. These basins then discharge through a stormwater outfall located 

at Mission Ditch, adjacent to Turner Road just outside the northeast boundary of the facility. 

Mission Ditch flows north towards Pringle Creek, eventually discharging into the Willamette 

River. Surface water and stormwater runoff collected in these ponds does not flow through an oil 

water separator, so any residual from these ponds is discharged directly to the stormwater 

outfall. 

FTA 02 – Open Field

During interviews, it was noted that from approximately 1989 through 1991, annual fire training 

activities involving AFFF would occur in a large grassy field to the west of Hangar 1. During fire 

training activities, controlled burns using wood and other organic debris would occur in this area 

over the course of a weekend. Multiple ORARNG facilities would participate in this training by 

bringing their own firetrucks pre-filled with AFFF and using the open field for fire training 

activities. A firetruck at Salem with an AFFF tank capacity of approximately 50 gallons would 

also be used during these annual trainings; however, exact AFFF quantities used during each 

event and concentration of AFFF are unknown. 

Following these trainings, the trucks were transported to the nearby Salem Fire Department #6 

where purging of the AFFF from the trucks would occur. Based on interviewee knowledge, one 

firetruck was at the Salem AASF from approximately 1989 through 1994. It is unknown if there 

was a designated storage location for the firetruck between annual trainings. 

Several stormwater catch basins are located along the east perimeter of the grassy FTA. These 

catch basins collect stormwater that is then discharged into Mission Ditch, just outside the 

northeast boundary of the facility. 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

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FTA 03 – Helicopter Training Area

During interviews, the training site manager at the AASF indicated that the ORARNG conducted 

annual firefighting training utilizing a helicopter equipped with AFFF. This training occurred every 

spring from 1998 until 2014 at several ARNG facilities throughout the state of Oregon. The 

helicopter would take five to twenty flights around the AASF and the nearby Creek Falls training 

area, just west of Salem, and release a combination of water and AFFF for fire training 

purposes. 

The helicopter was equipped with a 1,000 gallon water tank and a 35 gallon AFFF tank; 

however, it was estimated that only 5 gallons of concentrated AFFF were used during each 

training event. The foam was added to the helicopter at the AASF and stored in 5-gallon 

buckets; however it is unknown where the filling of the tank on the helicopter occurred or where 

5-gallon buckets of AFFF were stored at the facility. While a designated area to drop the AFFF 

and water mixture was not established during training activities, it was estimated that during 

training the AFFF and water mixture were commonly released to the west of the flightline, 

surrounding FTA 01 and FTA 02. 

Aircraft Maintenance Building

During interviews, personnel noted that annual firefighting training activities occurred just 

outside the aircraft maintenance building, located on the south end of the facility. Following 

construction of the aircraft maintenance building in approximately 2013, joint annual trainings 

with personnel from the AASF and the local Salem Fire Department would occur outside this 

building. Firetrucks were used by both ORARNG and Salem Fire Department to conduct fire 

training activities. Interviewees stated that this training only involved water, and did not involve 

the use of AFFF. There are no suspected releases of AFFF at or within the vicinity of the aircraft 

maintenance building.
Mill Creek

Blue

Gill

Lake

Aircraft Maintenance Building

FTA 01 Stormwater Detention Pond

FTA 02 Open Field

FTA 03 Helicopter Training Area

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

1/7/2019

1/7/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:7,200

1/7/2019 ­ Figure 2-1

PM RG 1/7/2019

12420 Milestone Center Drive

Germantown, MD 20876

Fire Training Areas

Base Map: Sources: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_2-1_Salem_Fire_Training_Areas.mxd

0 300 600 1,200

Feet

Legend

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

River/Stream

14
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

15

3. Non-Fire Training Areas

Five non-FTAs where AFFF was stored and/or released were identified during the PA. A 

description of each non-FTA is presented below, and the non-FTAs are shown on Figure 3-1. 

Hangar 2

Hangar 2, directly across from FTA 01, currently has six empty TriMax 30 tanks stored inside the 

bay doors. These tanks were removed from the flightline and emptied in the stormwater 

detention pond across from Hangar 2 during the last fire training event in December 2017. 

These tanks were previously filled with concentrated 3% AFFF. Following the training, the empty 

tanks were placed within the hangar for temporary storage. Defense Reutilization and Marketing 

Office (DRMO) services and inspects these tanks monthly; however, it is unknown when these 

tanks will be picked up for disposal. New TriMax 30 tanks were brought in to replace the empty 

TriMax 30 tanks and placed throughout the facility, as described below in Section 3.4. 

Additionally, interviewees stated that one firetruck was located within Hangar 2 from 

approximately 1974 until 1988. The firetruck was deployed for fire training activities and 

contained concentrated AFFF; however the quantity and concentration of AFFF on the truck 

during the time of storage is unknown. Exact timeframes and locations of fire training activities 

within the AASF between 1974 and 1988 are unknown. Following fire training activities, it is 

common for firetrucks to be washed down of any potential residual AFFF. Interviewees could not 

provide information on where this potential firetruck washing occurred; however, it is likely this 

occurred in or around the firetruck storage bay of Hangar 2. Due to the lack of floor drains in the 

storage bay of Hangar 2, potential washing of firetrucks at this location would result in residual 

AFFF being washed onto the nearby ramp area. 

In 1988, the firetruck was relocated to Pendleton AASF. No spills or releases were reported from 

this firetruck during its duration of storage and the exact storage location of the previous 

firetruck within the hangar does not contain any floor drains.

With the exception of the area mentioned above within Hangar 2, all drains within hangars at the 

AASF are routed to the local sanitary sewer and then treated at Willow Lake WWTP, 

approximately 11 miles north of the AASF. This WWTP treats wastewater and then discharges 

through a 72-inch stormwater outfall into the Willamette River (ORDEQ, 2004). 

Former Chrome Plating Facility 

From approximately the 1940s until 2008, a former carnival equipment ride production plant, 

previously owned and operated by Eyerly Aircraft Company, was located in the area directly 

behind Hangar 2. This production plant previously conducted chrome plating operations. In 

2010, the ORARNG acquired this land following extensive remedial investigations and feasibility 

studies for various heavy meals and hexavalent chromium. The facility and associated debris 

were removed following demolition of the plant under ORARNG. 

Chrome plating operations commonly involve PFAS-containing mist suppressants to reduce the 

risk of metal fires. There is no knowledge of any AFFF-related activities at this previous plant; 

however, given the timeframe of use, previous chrome plating activities, and historic presence of 

hexavalent chromium at this location, it is possible that PFAS-containing materials were used or 

stored at some point during the operational history of the plant.
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

16

Wash Pads 

As discussed in Section 2.3, annual helicopter fire training would occur at the AASF. 

Interviewee’s estimated that training occurred from 1998 to 2014. Following each training event, 

any residual from the helicopter foam tank was washed out at the AASF. The washing of the 

helicopter tanks occurred at the designated wash pad; however, this wash pad was not installed 

until 2002. The previous wash pad area was located approximately 100 yards north of hangar 2 

and was used for aircraft washing prior to the installation of the current wash pad; however, the 

date of installation of this former wash pad is unknown. Additionally, the historic connection of 

this former wash pad to either the sanitary sewer or stormwater could not be confirmed. 

Residual from the wash pad has various flow routes controlled by a demand valve. If the 

demand valve is not actuated, residual is routed directly to the stormwater system. When the 

demand valve is actuated, drains within the wash pad collect the residual and follow a specific 

flow pattern: oil water separator (OWS), by-pass vault with overflow to the sanitary sewer, 

effluent storage tank, 500-gallon surge tank, and then an evaporator. According to interviewee’s, 

when actuated, the system continues to send effluent to the treatment system for multiple 

'dumps' from the effluent storage tank. Any non-liquid residual is collected and disposed of as 

hazardous waste, while liquid residual is discharged to Mission Ditch, just outside the northeast 

boundary of the facility. 

Fuel Shed

During interviews, it was noted that in approximately 2010 or 2011, the Wildlands Fire Manager 

at the Camp Umatilla ORARNG facility was contacted by the AASF personnel to inquire about 

the transfer of approximately three 5-gallon buckets of concentrated AFFF from the AASF to 

Camp Umatilla. The AFFF was stored in the fuel shed at the AASF and personnel attempted to 

transfer this AFFF to the Camp Umatilla. The Wildlands Fire Manager stated he did not have a 

purpose for the AFFF and refused acceptance of the 5-gallon buckets. 

The manufacturer and specific concentrations of this AFFF product are unknown; however, it is 

believed that these buckets were unopened and unused during their storage. It is unsure how 

long the AFFF was stored in the fuel shed prior to contacting the Wildlands Fire Manager, or 

when exactly the AFFF was disposed of; however, the AFFF was not present in the fuel shed 

during the time of this PA site visit. The floor of the fuel shed is concrete, and no floor drains are 

present within the shed. Whether unintended spills or releases occurred from these buckets 

during or prior to their storage in the fuel shed is unknown. 

Ramp Area

There are currently six full TriMax 30 tanks containing 3% concentrated AFFF located 

throughout the AASF, with most of the tanks being stored near the aircraft ramp areas. The 

following locations of the TriMax 30 tanks are described below: 

· One tank outside of Building 05313

· One tank on a paved area outside the southern-most concrete helicopter parking pad

· One tank along a paved area, approximately 50 yards southeast of FTA 01

· One tank outside between Hangar 3 and the oil water separator evaporator

· One tank west of Hangar 1, approximately 20 yards west of the northern-most helicopter 

parking pad, along the boundary of FTA 02
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

17

· One tank outside the fueling point 

These tanks, inspected monthly, have been stored outside since approximately December 

2017, following the last training activity. While DRMO handles the inspection of tanks and 

disposal of empty tanks, purchasing of these tanks happens through United States Federal 

Procurement Office. No spills or releases have been reported from any of the tanks. 

Landfills

Approximately five miles southeast of the AASF, is a household hazardous waste facility located 

at the Salem-Keizer Recycling and Transfer Station. The geographic coordinates for this facility 

are 44°53’59.58’’N by 122°56’23.57’’W. Various household hazardous wastes can be sent to 

this facility including pesticides, fuels, solvents, mercury, and paint thinners. 

Brown’s Island Demolition Landfill is permitted by the Oregon Department of Environmental 

Quality and is located approximately eight miles west of the AASF. The geographic coordinates 

are 44°55’22.87’’N by 123°05’16.72’’W. This landfill only accepts certain construction demolition 

wastes such as concrete, asphalt, tile, and glass. 

Landfills are not usually a primary potential release area of PFAS, but materials disposed of in 

landfills may create a secondary source of contamination. Such materials, to name a few, may 

include sludge from a WWTP that processes PFAS-laden water, used AFFF storage containers, 

or products associated with waterproofing uniforms or boots.
Mill Creek

Blue

Gill

Lake

Fuel Shed

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

Former Chrome Plating Facility

Hangar 2

Wash Pad

Former Wash Pad

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

1/2/2019

1/2/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:7,200

1/2/2019 ­ Figure 3-1

PM RG 1/2/2019

12420 Milestone Center Drive

Germantown, MD 20876

Non-Fire Training Areas

Base Map: Sources: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_3-1_Salem_Non-Fire_Training_Areas.mxd

0 300 600 1,200

Feet

Legend

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

River/Stream

18
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

19

4. Emergency Response Areas

No emergency response areas were identified within or directly surrounding the AASF facility

during the PA through interviews or previous investigations.
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

20

5. Adjacent Sources

Two potential off-facility sources of PFAS adjacent to the AASF, not under the control of the 

ORARNG, were identified during the PA. A description of each off-facility source is presented 

below and shown on Figure 5-1.

Salem Fire Department #6

Salem Fire Department #6 is located directly west of Salem AASF. The geographic coordinates 

of this fire department are 44°54'49.46"N and 123°00'33.74"W. As mentioned in Section 2.2, 

multiple training activities occurred from 1989 through 1991 at the Salem AASF involving the 

use of AFFF. Following these trainings, firetrucks were transported to the nearby Salem Fire 

Department #6 where purging of the AFFF from the trucks would occur. According to interviews, 

at least two fire trucks are currently located at the Salem Fire Department #6, with AFFF holding 

tanks on each of these trucks. Interviewees recall a number of AFFF releases occurring from 

these tanks within the last several years as well as regular nozzle testing occurring within the 

fire department boundary. Exact dates or timeframe of these releases and nozzle tests are 

unknown. Additionally, quantity and concentration of AFFF used during each release are also 

unknown. 

Salem Airport Joint Training Area

During interviews, it was noted that ORARNG personnel would conduct joint annual off-site fire 

training activities with the Salem Fire Department at the nearby Salem Municipal Airport. The 

Salem Fire Department is believed to be the only entity other than ORARNG that would 

participate in these trainings. 

Trainings would occur with firetrucks equipped with AFFF dispensing systems in which 

personnel would practice operating the nozzles. These fire training activities would occur just 

southwest of the facility, near the south end approach of Runway 34. While it is unsure what 

year these trainings began, interviewees stated the last time this training occurred was in 

approximately 2017. The type, quantity, and concentration of AFFF used during these training 

events are unknown. 
Stone

Quarry

Lake

Salem FD #6

Joint Training Area

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

5/30/2019

5/30/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:7,560

5/30/2019 ­ Figure 5-1

PM RG 5/30/2019

12420 Milestone Center Drive

Germantown, MD 20876

Adjacent Sources

Base Map: Sources: Esri, HERE, Garmin, USGS,

Intermap, INCREMENT P, NRCan, Esri Japan, METI,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_5-1_Salem_Adjacent_Source.mxd

0 315 630 1,260

Feet

Legend

Potential PFAS Release

Facility Boundary

Water Body

River/Stream

Canal/Ditch

21
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

22

6. Conceptual Site Model

Based on the PA findings, two AOIs were identified at the AASF: AOI 1 Former FTAs and AOI 2 

Non-FTAs. The AOI locations are shown on Figure 6-1. The following sections describe the 

CSM components and the specific CSMs developed for these AOIs. The CSM identifies the 

three components necessary for a potentially complete exposure pathway: (1) source, (2) 

pathway, (3) receptor. If any of these elements are missing, the pathway is considered 

incomplete. Receptors at the AASF include site workers, construction workers, and trespassers. 

Potential off-post receptors include residents and recreational users.

In general, the potential PFAS exposure pathways are ingestion and inhalation. Dermal contact 

is not considered to be a potential exposure pathway as studies have shown very limited 

absorption of PFAS through the skin (NGWA, 2018). 

AOI 1 Former FTAs 

AOI 1 is the Former FTAs. Three of the former FTAs previously identified in Section 2, FTA 01 

Stormwater Detention Pond, FTA 02 Open Field, and FTA 03 Helicopter Training Area, are 

located within AOI 1. Based on groundwater and surface water flow direction, similar historic fire 

training activities, and close proximity to one another, these FTAs were grouped into one AOI. A 

description of each of these FTAs and their relation to potential PFAS exposure are described 

below. 

FTA 01 is the Stormwater Detention Pond. For at least fifteen to twenty years, this designated 

detention pond has been used for fire training activities and controlled burns. The fire training 

activities included the release of approximately one gallon of 3% concentrated AFFF from each 

of the six TriMax 30 tanks over a fifteen to twenty year period. The detention pond is unlined 

and any residual from the pond collects in underground drainage basins that then discharge 

through an off-site stormwater outfall just outside the northeastern boundary of the facility. The 

stormwater outfall flows into Mission Ditch, which discharges into Pringle Creek, a tributary of 

the Willamette River. While another stormwater detention pond is located directly north of FTA 

01, no fire training activities or AFFF related releases were ever reported at this pond.

FTA 02 is the Open Field area. From approximately 1989 through 1991, annual fire training 

activities occurred in this open field, west of Hangar 1. Similar to the fire training activities that 

occurred at FTA 01, burning of wood and other organic debris would occur at this location 

annually. A firetruck with an AFFF tank capacity of approximately 50 gallons would be used 

during these annual training events; however, exact AFFF quantities used during each event 

and concentration of AFFF are unknown. Several stormwater catch basins are located along the 

east perimeter of the grassy FTA. These catch basins collect stormwater that is then discharged 

into Mission Ditch, just outside the northeast boundary of the facility. Mission Ditch discharges 

into Pringle Creek, a tributary of the Willamette River.

FTA 03 is the Helicopter Training Area. During interviews with the former Salem Training Site 

Manager, it was noted that annual helicopter training events occurred at Salem AASF from 

approximately 1998 until 2014. A 1,000-gallon water tank and a 35-gallon AFFF tank were used 

during these events; however, it is only estimated that approximately 5 gallons of concentrated 

AFFF were used during each of these training events. While a designated area to drop the 

AFFF and water mixture was not established during training activities, it was estimated that 

during training, the AFFF and water mixture were commonly released to the west of the 

flightline, surrounding FTA 01 and FTA 02. 

Ground-disturbing activities at AOI 1 could result in site worker and construction worker 

exposure to potential PFAS contamination via ingestion of surface soil or inhalation of soil 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

23

particles (dust). Ground-disturbing activities to subsurface soil could result in site and 

construction worker exposure via ingestion of subsurface soil. Therefore, the inhalation and 

ingestion pathways for these receptors are considered potentially complete for AOI 1.

While the surface water intakes for the City of Salem drinking water are all located upgradient of 

the AASF, private drinking water wells are located less than a mile downgradient from the AASF 

facility. Additionally, the Willamette River and its surrounding tributaries are popular for 

recreational activities. Because private drinking water wells are located downgradient of the 

AASF and recreational use of the surrounding surface water bodies is heavy, the ingestion 

exposure pathway for groundwater, surface water, and sediment is considered potentially 

complete for off-post residents and recreational users at AOI 1. Based on groundwater and 

surface water flow patterns, identified adjacent sources are not anticipated to have an impact on 

the Salem AASF. The CSM for AOI 1 is shown on Figure 6-2.

AOI 2 Non-FTAs 

AOI 2 is the Non-FTAs. Several of the former non-FTAs previously identified in Section 3, 

Hangar 2, Former Chrome Plating Facility, Wash Pads, and Ramp Area, are located within AOI 

2. Based on groundwater and surface water flow direction, similar potential historic AFFF 

releases, and close proximity to one another, these non-FTAs were grouped into one AOI. A 

description of each of these non-FTAs and their relation to potential PFAS exposure are 

described below. 

According to interviewee’s, Hangar 2 historically stored a firetruck with an AFFF tank within a 

designated bay. This truck would routinely participate in fire training activities involving AFFF 

from approximately 1974-1988. Commonly, firetrucks are washed following fire training activities 

to remove any potential residual AFFF left on the truck. While a designated area for the washing 

of this truck could not be confirmed, washing likely occurred at the storage location within 

Hangar 2. The storage bay area of Hangar 2 does not have floor drains, so any potential AFFF 

that was rinsed from the truck during washing would have likely flowed onto the nearby paved 

asphalt area outside the bay door. Additionally, this hangar currently has six empty TriMax tanks 

stored within a closed bay. These tanks have been stored in this hangar since December 2017; 

however, it is unknown if other TriMax tanks were previously stored inside this hangar. 

The Former Chrome Plating Facility is located between Hangar 2 and Hangar 3. Previous 

operations at this facility included chrome and metal plating activities, which commonly involve 

the use of PFAS-containing mist suppressants. While there is no knowledge of any AFFFrelated activities at this previous plant, given the timeframe of use, previous chrome plating 

activities, and historic presence of hexavalent chromium at this location, it is possible that 

PFAS-containing materials were used or stored at some point during the operational history of 

the plant. Portions of the former facility boundary now consist of paved asphalt areas and small 

grass patches. 

The Wash Pad is designated for helicopter and other aircraft washing, and was installed in 

2002. Following annual helicopter training events, the AFFF tanks from the helicopter would be 

rinsed and washed at the wash pad. The concrete wash pad area contains drains that collect 

any residual and control flow based on a demand valve. When the valve is not actuated, 

residual flows to the stormwater system. When the valve is actuated, residual flows through an 

OWS and eventually an evaporator. The evaporator collects and stores any solid residual, while 

liquid residual is discharged through the nearby offsite stormwater outfall. The stormwater outfall 

discharges to Mission Ditch, which then flows into Pringle Creek, a tributary of the Willamette 

River. 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

24

The Ramp Area consists mostly of paved asphalt area outside the hangars. As discussed

above, firetrucks were routinely washed following training activities. Given the long-term storage

of a firetruck with Hangar 2 and the lack of drains within the storage bay, it is likely this truck

was washed on the ramp area just outside of Hangar 2. The current wash pad was not installed

until 2002; therefore, it is likely that the washing of firetrucks following AFFF-related training

activities occurred at the previous wash pad area and the surrounding paved vicinity of the ramp

area. Additionally, since December 2017, there have been six full TriMax tanks located

throughout the ramp area of the Salem AASF. These tanks are inspected monthly by DRMO

and are replaced as needed. Based on aerial photography review, various TriMax tanks have

been stored outside since at least 2005. No spills or released have been reported from any of

the tanks.

Activities at AOI 2 include potential washing of firetrucks following fire training activities with

AFFF, potential historic presence of PFAS-containing mist suppressants, known and potential

washing of aircraft at two concrete wash pads, and other potential releases within the paved

ramp area.

Ground-disturbing activities at AOI 2 are likely to result in site worker and construction worker

exposure to potential PFAS contamination via ingestion of surface soil or inhalation of soil

particles (dust). Additionally, ground-disturbing activities to subsurface soil at AOI 2 are also

likely to result in site and construction worker exposure via ingestion of subsurface soil.

Therefore, the inhalation and ingestion pathways for these receptors are considered potentially

complete for AOI 2.

Following drainage to the oil water separator, liquid residual from the wash pad is discharged to

the stormwater outfall at Mission Ditch, just outside the facility boundary. While the surface

water intakes for the City of Salem drinking water are all located upgradient of the AASF, private

drinking water wells are located less than a mile downgradient from the AASF facility. In general,

groundwater and surface water flow within the vicinity of the Salem AASF is generally

west/northwest, following the watershed discharge and toward Mission Ditch. The Willamette

River and its surrounding tributaries are popular for recreational activities. Because private

drinking water wells are located within a mile downgradient of the AASF and recreational use of

the surrounding surface water bodies is heavy, the ingestion exposure pathway for groundwater,

surface water, and sediment is considered potentially complete for off-post residents and

recreational users at AOI 2. Based on groundwater and surface water flow patterns, identified

adjacent sources are not anticipated to have an impact on the Salem AASF. The CSM for AOI 2

is shown on Figure 6-2.
A!

A!

A!

A!

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

Former Wash Pad

Aircraft Maintenance Building

FTA 01 

Stormwater 

Detention Pond

FTA 02 Open Field

Wash Pad

FTA 03 

Helicopter 

Training Area

Salem FD #6

Former 

Chrome Plating 

Facility

Hangar 2

Joint Training Area

Fuel Shed

AOI 2

AOI 1

Lower Mill

Creek

Watershed

Croisan

Creek-Willamette

River Watershed

Mill Creek

Wirth Lake

Blue

Gill Lake

Stone

Quarry

Lake

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

5/30/2019

5/30/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

1:11,400

5/30/2019 ­ Figure 6-1

PM RG 5/30/2019

12420 Milestone Center Drive

Germantown, MD 20876

Areas of Interest

Base Map: Source: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_6-1_Salem_AOIs.mxd

0 475 950 1,900

Feet

Legend

Potential PFAS

Release

No Suspected

Release

Facility Boundary

Water Body

River/Stream

Canal/Ditch

Surface Water Flow

Direction

Inferred Groundwater

Flow Direction

A! Monitoring Well

A! Other Well

25
Media

SOURCE PATHWAY RE

AOI 1 & AOI 

2

Fire Training 

Areas; Drainage 

Ditch; Wash Pad; 

Ramp and 

Storage Areas

PFAS in 

Surface Soil

PFAS in 

Subsurface 

Soil

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ Infiltration

Airborne Soil 

particulate

Surface Soil 

at AOI

Surface 

Water/ 

sediment

Subsurface 

Soil

Shallow 

Groundwater

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

IngestionIngestion

Ingestion

Ingestion

Hum

C

Flow-Chart ContinuesPartial / Possible FlowFlow-Chart StopsIncomplete PathwayPotentially Complete PathwayComplete Pathway

Site 

Worker

Cons

W

Site 

Worker

Cons

W

LEGEND

Figure 

Conceptual Si

AOI 1 and 

Salem AA

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

/ / / / 

/ 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

27

7. Conclusions

This report presents a summary of available information gathered during PA efforts on the use 

and storage of AFFF at the AASF. The PA findings are based on personnel interviews, 

environmental investigations and reports, historical documents, and the VSI.

Findings

Two AOIs related to a PFAS release were identified (Table 7-1) at the Salem AASF during the 

PA (Figure 7-1).

Table 7-1: AOIs at Salem AASF #1

Area of Interest Name Used by Potential Release 

Dates

AOI 1 Former FTAs ORARNG & Salem 

Fire Department ~1989-2017

AOI 2 Non-FTAs ORARNG & Eyerly 

Aircraft Company ~1940s-2017

Based on the AFFF releases at these AOIs, there is potential for exposure to PFAS 

contamination in surface soils to site and construction workers, nearby residents, and 

recreational users, and in subsurface soils to site and construction workers via inhalation and 

ingestion. There is also the potential for exposure to PFAS contamination in surface water and 

sediment for all receptors via ingestion, and in shallow groundwater for all receptors due to flow 

patterns and the close proximity of private drinking water wells. 

The following areas discussed in Section 2 through Section 5 were determined to have no 

suspected PFAS releases to the environment (Table 7-2).

Table 7-2: No Suspected Release Areas

No Suspected 

Release Area Used by Rationale for No Suspected Release Determination

Aircraft 

Maintenance 

Building

ORARNG and 

Salem Fire 

Department

Several interviewees’ stated that only water was used 

for these trainings. 

Fuel Shed ORARNG

According to interviews, the 5-gallon buckets of AFFF 

were unopened and unused during the duration of 

storage in the fuel shed. No spills or releases were 

reported in this fuel shed. 

Uncertainty

A number of information sources were investigated during this PA to determine the potential for 

PFAS-containing materials to have been present, used, or released at Salem AASF. Historically, 

documentation of PFAS use was not required because PFAS were considered benign. Records 

were not typically kept by the facility or available during the PA on the use of PFAS in 

emergency response or by non-ORARNG units during training events at the AASF. 

The conclusions of this PA are predominantly based on the information provided during 

interviews with personnel who had direct knowledge of PFAS use at the facility. Sometimes the 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

28

provided information was vague. Gathered information has a degree of uncertainty due to the

absence of written documentation, the limited number of personnel with direct knowledge due to

staffing changes, the time passed since PFAS was first used (1969 to present), and a reliance

on personal recollection. Inaccuracies may arise in potential PFAS release locations. There is

also a possibility the PA has missed a source of PFAS, as the science of how PFAS may enter

the environment continually evolves.

In order to minimize the level of uncertainty, readily available data regarding the use and

storage of PFAS were reviewed, multiple persons were interviewed for the same potential

source area, and potential source areas were visually inspected. Table 7-3 summarizes the

uncertainties associated with the PA.

Table 7-3: Uncertainties

Area of Interest Source of Uncertainty

All AOIs

Exact timeframe of use at the AOIs is unknown or estimated.

Based on interviewee knowledge and review of historical

documents, information regarding any associated AFFF-activity

was only available from approximately 1974 until present. No

information relating to AFFF was available prior to 1974.

Stormwater Detention

Pond

Fire training events at this location were undocumented; 

therefore, exact quantities of AFFF used during these events is

estimated based on interviewee knowledge.

The timeframe of fire training activities at this location is

estimated between 1999 and 2017; however, exact years are 

unknown.

Open Field

The type, quantity, and concentration of AFFF potentially used

at this AOI are unknown.

The exact location of the training events that occurred at this

FTA is unknown; therefore, the FTA boundary is estimated

based on interviewee knowledge.

Helicopter Training Area

The type, quantity, and concentration of AFFF potentially used

at this FTA are unknown.

The exact location where the AFFF tank on the helicopter was

filled prior to trainings is unknown. The storage location of the 5-

gallon buckets used to fill the tank is also unknown.

Wash Pads

Interviewees stated that the current wash pad area was used to

wash helicopters following AFFF-related fire training exercises; 

however, the timeframe of the training exercises began before

the installation of the wash pad. It is unknown if helicopters

were washed at the former wash pad area following training

events prior to the installation of the current wash pad.

Hangar 2

It is unknown whether any potential releases of AFFF during

storage or washing of AFFF-capable firetrucks historically

occurred at this location. Given there are no floor drains located

in the designated storage area for a formerly stored AFFFcapable firetruck, it is likely that washing of the truck following
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

29

Area of Interest Source of Uncertainty

fire training activities occurred within or directly outside of 

Hangar 2. 

Former Chrome Plating 

Facility

The previous facility which conducted chrome plating operations 

is no longer present. While PFAS is commonly used in metal 

plating operations, there is no knowledge of AFFF fire 

suppression systems or PFAS-containing mist suppressants at 

this plant prior to demolition. 

TriMax Storage Areas

The TriMax 30 tanks located throughout the facility, mostly near 

the flightline, are inspected annually. Releases from these tanks 

only occur in designated areas for fire training activities. No 

spills or unintended releases have been reported from any of 

the tanks located outside at the various storage areas. 

Potential Future Actions

Interviews and records (covering 1974 to present) indicate that current or former ARNG 

activities may have resulted in potential PFAS releases at the two AOIs identified during the PA. 

Based on the CSMs developed for the AOIs, there is potential for receptors to be exposed to 

PFAS contamination in soil, groundwater, surface water, and sediment at these AOIs. Table 7-4

summarizes the rationale used to determine if the AOI should be considered for further 

investigation under the CERCLA process and undergo a Site Inspection (SI). 

ARNG will evaluate the need for an SI at AOIs 1 and 2 at Salem AASF based on the potential 

receptors, the potential migration of PFAS contamination off the facility, and the availability of 

resources.

Table 7-4: PA Findings Summary

Area of Interest AOI Location Rationale Potential 

Future Action

AOI 1 Former FTAs 44°54'40.40"N 

123° 0'6.62"W

Use of AFFF during fire training 

activities from 1989 to 2017. 

Proceed to an 

SI, focus on 

soil, 

groundwater, 

surface water, 

sediment

AOI 2 Non-FTAs 44°54'50.02"N; 

122°59'58.35"W

Activities included washing of 

firetrucks after training, potential 

presence of PFAS-containing mist 

suppressants, washing of aircraft 

at two concrete wash pads, and 

other potential releases during 

storage.

Proceed to an 

SI, focus on 

soil, 

groundwater, 

surface water, 

sediment
Aircraft Maintenance Building

FTA 01 

Stormwater 

FTA 02 Open Field Detention Pond

Wash Pad

FTA 03 

Helicopter 

Training Area

Salem FD #6

Former Chrome Plating Facility

Hangar 2

Joint Training Area

Fuel Shed

Former Wash Pad

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

TriMax Tank

AOI 2

AOI 1

Mill Creek

Blue

Gill

Lake

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

TK

5/30/2019

5/30/2019

NOTES Preliminary Assessment for PFAS at McNary Field Salem AASF, OR

5/30/2019

1:8,400 ­ Figure 7-1

PM RG 5/30/2019

12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

Base Map: Source: Esri, DigitalGlobe, GeoEye,

Earthstar Geographics, CNES/Airbus DS, USDA, USGS,

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\OR\Salem_Figures\Salem_PA_Figures\Fig_7-1_Salem_Summary.mxd

0 350 700 1,400

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

River/Stream

Canal/Ditch

30
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

31

8. References

AMEC Earth & Environmental, Inc. 2006. Phase II Environmental Baseline Study: Army Aviation

Support Facility No. 1 Turner Road SE Salem, Oregon.

City of Salem Public Works Department. 2018. 2018 Annual Water Quality Report. Retrieved

October 2018, from https://www.cityofsalem.net/citydocuments/water-quality-report-english.pdf.

Conlon T., et. al. 2005. Ground-Water Hydrology of the Willamette Basin, Oregon. United States

Geological Survey. Scientific Investigations Report 2005-5168.

Hampton, E.R.. 1972. Geology and Ground Water of the Molalla-Salem Slope area, Northern

Willamette Valley, Oregon. U.S. Geological Survey Water Supply Paper 1997, 83 p.

National Ground Water Association (NGWA). 2018. Groundwater and PFAS: State of

Knowledge and Practice. January.

O’Connor, J.E., et al. 2001. Origin, Extent, and Thickness of Quaternary Geologic Units in the

Willamette Valley, Oregon; U.S. Geological Survey, Professional Paper 1620, 51 p.

Oregon Department of Environmental Quality (ORDEQ). 2004. National Pollutant Discharge

Elimination System Permit Evaluation and Fact Sheet.

Oregon Military Department (OMD). 2008. Site Development Plan: Oregon Military Department

Salem Army Aviation Support Facility (AASF) #1 Master Plan.

Oregon Water Resources Department (ORWRD). 2018. Groundwater Hydrographs. Retrieved

October 2018, from https://apps.wrd.state.or.us/apps/gw/gw_info/gw_map/Default.aspx

Piper, A. 1942. Groundwater Resources of the Willamette Valley, Oregon. United States

Geological Survey.

United States Army Center for Health Promotion and Preventive Medicine (USACHPPM). 2002.

Site Assessment Survey No. 38-EH-5049A-02 Oregon Army National Guard Army Aviation

Support Facility No. 1 Salem, Oregon.

United States Environmental Protection Agency (USEPA). 1991. Guidance for Performing

Preliminary Assessments under CERCLA. September 1991.

Woodward D., Gannett M., and Vaccaro J. 1998. Hydrogeologic Framework of the Willamette

Lowland Aquifer System, Oregon and Washington. United States Geological Survey.

Professional Paper 1424-B.
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix A

Data Resources
PFAS Preliminary Assessment Report

Army Aviation Support Facility - Salem, Oregon

Data Resources will be provided separately on CD. Data Resources for the Salem Army 

Aviation Support Facility include:

Salem AASF Leases, Licenses, and Permits

• 1971 Bargain and Sale Deed between the City of Salem and the State Military Department

• 1985 Bargain and Sale Deed between the City of Salem and the State Military Department

• 1986 Airport Lease Agreement between the City of Salem and the State of Oregon Military

Department

• 1987 Airport Lease Agreement between the City of Salem and the State of Oregon Military

Department

• 1989 Airport Lease Agreement between the City of Salem and the State of Oregon Military

Department

• 1994 Airport Lease Agreement between the City of Salem and the State of Oregon Military

Department

• 2009 Airport Lease and Access Agreement between the City of Salem and the State of

Oregon by and through the Oregon Military Department

• 2012 Easement and Equitable Servitude from Oregon Military Department to Oregon

Department of Environmental Quality

• 2012 Easement and Equitable Servitude between Jack. V Everly Revocable Trust and the

State of Oregon through the Oregon Department of Environmental Quality

• 2012 Consent Order for Closure of Eyerly Aircraft Site from Oregon Military Department to

Oregon Department of Environmental Quality

• 2012 Statutory Warranty Deed between Jon V. Eyerly and the State of Oregon by and

through the Oregon Military Department

Salem AASF PFAS Release Information

• 2004 Tri-Max Material Safety Data Sheet

Previous Investigations Completed at the Salem AASF

• 1994 Salem District Proposed Resource Management Plan/Final Environmental Impact

Statement, Volume I

• 2002 Site Assessment Survey No. 83-EH-5049A-02 Oregon Army National Guard Army

Aviation Support Facility No. 1, Salem, Oregon

• 2006 AMEC Earth & Environmental, Inc. Phase II Environmental Baseline Study: Army

Aviation Support Facility No. 1

• 2008 Site Development Plan, Oregon Military Department Salem Army Aviation Support

Facility (AASF) #1 Master Plan

• 2011 Staff Report for the Recommended Remedial Action for the Eyerly Aircraft Site

Salem AASF Installation Maps

• 2005 Jack Eyerly Trust Property Remediation Sub Areas

• 2006 Former Eyerly Aircraft Property

• 2018 US Fish and Wildlife Service Wetlands Map – Salem AASF 1
PFAS Preliminary Assessment Report

Army Aviation Support Facility - Salem, Oregon

2018 Site #41C05 McNary Field Salem AASF

Salem As-Builts

• 1971 Hangar 1 As-Built Construction Plans

• 1975 Hangar 2 As-Built Construction Plans

• 1991 Hangar 3 As-Built Construction Plans

• Former Wash Pad Location As-Built

Salem AASF Correspondence

• 2018 Confirmation of no AFFF use Correspondence

Salem AASF EDR Report

• 2018 Salem AASF Environmental Data Resource Report
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix B

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix B.1

Interview Records









PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix B.2

Visual Site Inspection Checklists








PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix B.3

Conceptual Site Model Information
Preliminary Assessment – Conceptual Site Model Information

Site Name: Salem AASF #2

Why has this location been identified as a site?

Multiple AFFF releases previously occurred on this property. A former chrome plating facility is also 

located on what is now property owned by ORARNG. 

Are there any other activities nearby that could also impact this location?

Yes, several releases reported at the nearby Salem Fire Department (#6) and joint fire trainings at the 

Salem Airport

Training Events

Have any training events with AFFF occurred at this site? Yes

If so, how often? Various dates at multiple locations, ranging between 1989 and 2017

How much material was used? Is it documented? Estimated approximately 6 gallons per year at 

stormwater detention pond; however, quantities at other locations unknown. All releases were 

undocumented. 

Identify Potential Pathways: Do we have enough information to fully understand over land surface 

water flow, groundwater flow, and geological formations on and around the facility? Any direct 

pathways to larger water bodies?

Surface Water:

Surface water flow direction? East towards Willamette River tributaries (Wirth Lake, Blue Gill Lake, 

Mission Ditch, Mill Creek)

Average rainfall? 40 inches/year

Any flooding during rainy season? No

Direct or indirect pathway to ditches? Direct pathway to ditches 

Direct or indirect pathway to larger bodies of water? Indirect pathway

Does surface water pond any place on site? Yes, two stormwater detention ponds

Any impoundment areas or retention ponds? Yes, two stormwater detention ponds 

Any NPDES location points near the site? No

How does surface water drain on and around the flight line? Surface water within the AASF flows 

towards the storm drain system, which is located on the paved western edge of the facility. Stormwater 

and surface water runoff are directed into two stormwater detention ponds which discharge to Mission 

Ditch, just outside the southeast boundary of the facility
Preliminary Assessment – Conceptual Site Model Information

Groundwater:

Groundwater flow direction? East/southeast 

Depth to groundwater? Typically 12-25 bgs in the area surrounding the facility

Uses (agricultural, drinking water, irrigation)? Drinking and industrial 

Any groundwater treatment systems? No

Any groundwater monitoring well locations near the site? Yes

Is groundwater used for drinking water? Yes 

Are there drinking water supply wells on installation? No

Do they serve off-post populations? N/A

Are there off-post drinking water wells downgradient? Yes, within one mile

Waste Water Treatment Plant:

Has the installation ever had a WWTP, past or present? No

If so, do we understand the process and which water is/was treated at the plant? N/A

Do we understand the fate of sludge waste? Yes, sludge waste from the oil water separator is sent as 

hazardous waste for disposal once the reservoir is full. 

Is surface water from potential contaminated sites treated? No, only surface water in/around the wash pad 

area, which is directed to the oil water separator. All other surface water/stormwater flows directly into 

onsite detention ponds which then flow to Mission Ditch, directly offsite. 

Equipment Rinse Water

1. Is firefighting equipment washed? Where does the rinse water go? Potential previous firefighting 

activities involving helicopters involved washing at the wash rack, which has drains connected to the oil 

water separator which then discharges liquid waste to Mission Ditch, just outside the southeast boundary 

of the facility. 

2. Are nozzles tested? How often are nozzles tested? Where are nozzles tested? Are nozzles cleaned after 

use? Where does the rinse water flow after cleaning nozzles? No firetrucks on site with AFFF; all 

firefighting activity occurs at local Salem Fire Department #6, west of the facility. Interviewee’s believed 

nozzles are tested directly on ground outside of fire station. 

3. Other?
Preliminary Assessment – Conceptual Site Model Information

Identify Potential Receptors:

Site Worker: Yes

Construction Worker: Yes

Recreational User: Yes

Residential: Yes 

Child: Yes

Ecological: Yes

Note what is located near by the site (e.g. daycare, schools, hospitals, churches, agricultural, livestock)?

Residential and industrial areas, shopping centers, schools, hospital, churches,

Documentation

Ask for Engineering drawings (if applicable): Done

Has there been a reconstruction or changes to the drainage system? When did that occur?: No
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Salem, Oregon

Appendix C

Photographic Log
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 1

Description:

Facing south. One of the six 

full TriMax 30 tanks, 

collocated with non-PFAS 

containing portable fire 

extinguishers, located along 

the flightline.

Photograph No. 2

Description:

Facing East. The building 

directly in front is Hangar 3. 

The TriMax 30 tank is stored 

outside, to the left of the 

hangar. The small building 

just to the left of the TriMax 

30 houses the oil water 

separator (OWS) evaporator. 
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 3

Description:

Floor drains inside of Hangar 

3. These drains lead to the 

local sanitary sewer which is 

sent to the Willow Lake 

Wastewater Treatment Plant 

before being discharged into 

the Willamette River. 

Photograph No. 4

Description: 

Facing Southeast. One of the 

two grate drains present at the 

south end entrance of Hangar 

2. The trench drains discharge 

to the OWS.. 
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 5

Description:

Facing West. One of the two 

stormwater management 

ponds located at Salem AASF 

#1. 

Photograph No. 6

Description: 

Facing Northeast, towards 

Hangar 2. One of the 

stormwater drains directly 

outside the stormwater 

management pond..
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 7

Description:

Facing Northwest towards 

AOI 1. One of the storm 

drains directly outside the 

stormwater management pond.

. 

Photograph No. 8

Description: 

Facing North. One of the two 

storm drains located within the 

stormwater management pond.

This storm drain leads to the 

stormwater outfall just outside 

the northeast boundary of the 

facility. 
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 9

Description:

Facing Northwest, towards 

AOI 2. Stormwater and 

surface runoff collected in this 

drain discharges to the 

stormwater outfall just outside 

the northeast boundary of the 

facility. 

Photograph No. 10

Description:

Facing Northwest. One 

TriMax 30 tank located within 

AOI 2, the current fueling 

station can be seen on the right 

hand side of the picture. 
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 111

+

Description:

Facing Southwest. Location of 

the fueling point located on 

the northern tip of the facility. 

Photograph No. 112

Description:

Facing Southeast. Pictured is 

Mission Ditch, where all 

stormwater and surface runoff 

from the facility is discharged. 

This off-site ditch flows 

west/northwest discharging 

into Pringle Creek, and 

eventually flowing into the 

Willamette River. 
Preliminary Assessment Report

Salem AASF #1

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Salem AASF #1 Salem, Oregon

Photograph No. 113

Description:

The previous firetruck storage 

area within Hangar 2. No 

drains are located within this 

storage area. 

Photograph No. 14

Description:

Six empty TriMax 30 tanks 

stored within a non-climate 

controlled room of Hangar 2.