FINAL

Preliminary Assessment Report

Army Aviation Support Facility,

Fort Belvoir, Virginia

Perfluorooctanesulfonic Acid (PFOS) and Perfluorooctanoic Acid 

(PFOA) Impacted Sites

ARNG Installations, Nationwide

June 2020

Prepared for:

Army National Guard Bureau

111 S. George Mason Drive

Arlington, VA 22204

UNCLASSIFIED
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

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Table of Contents

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

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

1.5.1 Soil .................................................................................................................6

1.5.2 Geology .........................................................................................................6

1.5.3 Hydrogeology .................................................................................................6

1.5.4 Hydrology .......................................................................................................7

1.5.5 Climate ...........................................................................................................7

1.5.6 Current and Future Land Use .........................................................................7

2. Fire Training Areas ...........................................................................................................11

3. Non-Fire Training Areas ...................................................................................................13

4. Emergency Response Areas ............................................................................................15

5. Adjacent Sources .............................................................................................................16

6. Preliminary Conceptual Site Model ..................................................................................18

7. Conclusions .....................................................................................................................22

8. References ......................................................................................................................25
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Tables

Table ES-1 AOIs at the AASF

Table 7-1 AOIs at the AASF

Table 7-2 Summary of Uncertainties

Table 7-3 PA Findings Summary

Figures

Figure ES-1 Summary of Findings

Figure ES-2 Preliminary Conceptual Site Model, AASF, VA

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 Area of Interest

Figure 6-2 Preliminary Conceptual Site Model, AASF, VA

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
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Fort Belvoir, Virginia

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Acronyms and Abbreviations

°F degrees Fahrenheit

AASF Army Aviation Support Facility

AECOM AECOM Technical Services, Inc.

AFFF aqueous film forming foam

AOI Area of Interest

ARNG Army National Guard

bgs below ground surface

CERCLA Comprehensive Environmental Response, Compensation, and Liability

Act

CFR Code of Federal Regulations

CSM conceptual site model

DAAF Davison Army Airfield

DCARNG District of Columbia Army National Guard

DLA Defense Logistics Agency

EDRTM Environmental Data Resources, Inc.TM

FTA fire training area

HA Health Advisory

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

SI Site Inspection

UCMR3 Unregulated Contaminant Monitoring Rule 3

US United States

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

VSI visual site inspection
PFAS Preliminary Assessment Report

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Fort Belvoir, Virginia

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Executive Summary

The Army National Guard (ARNG) is performing Preliminary Assessments (PAs) and Site

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

Impacted Sites at ARNG Facilities Nationwide. A PA for per- and polyfluoroalkyl substances

(PFAS)-containing materials was completed for the Army Aviation Support Facility (AASF; also

referred to as the “facility”) in Fort Belvoir, Virginia, to assess potential PFAS release areas and

exposure pathways to receptors. The AASF is an enclave of Davison Army Airfield (DAAF) at US

Army Garrison Fort Belvoir. The AASF is leased to the District of Columbia ARNG (DCARNG).

The performance of this PA included the following tasks:

· Reviewed available administrative record documents and Environmental Data Resources,

Inc. (EDR)TM report packages to obtain information relevant to potential PFAS releases, such

as: drinking water well locations, historical aerial photographs, Sanborn maps, and

environmental compliance actions in the area surrounding the facility; 

· Conducted a site visit on 18 October 2019 and completed visual site inspections at locations

where PFAS-containing materials were suspected of being stored, used, or disposed;

· Interviewed current DCARNG personnel during the site visit;

· Identified Area(s) of Interest (AOIs) and developed a preliminary conceptual site model (CSM)

to summarize potential source-pathway-receptor linkages of potential PFAS in soil,

groundwater, surface water, and sediment for each AOI.

One AOI related to a potential PFAS release was identified at the AASF during the PA. The AOI

is shown on Figure ES-1 and described in Table ES-1 below:

Table ES-1: AOIs at the AASF

Area of Interest Name Used by Potential Release

Date

AOI 1 Building 3121 and

Aircraft Ramp

DCARNG Unknown

Based on potential PFAS releases at the AOI, there is potential for exposure to PFAS

contamination in media at or near the facility. The preliminary CSM for the AASF, which presents

the potential receptors and media impacted, is shown on Figure ES-2. Based on the United States

Environmental Protection Agency (USEPA) Unregulated Contaminant Monitoring Rule 3

(UCMR3) data, it was indicated that no PFAS were detected in a public water system above the

USEPA’s lifetime Health Advisories within 20 miles of the facility. PFAS analyses performed in

2016 had method detection limits that were higher than currently achievable. Thus, it is possible

that low concentrations of PFAS were not detected during the UCMR3 sampling but might be

detected if analyzed today.
Aircraft Ramp

Building 3121

AOI 1

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Summary of Findings

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SOURCE PATHWAY RECEPTOR

AOI 1

AFFF release 

from Tri-Max/fire 

suppression 

system leaks

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ 

Infiltration

Airborne Soil 

particulate

Surface Soil 

at AOI

Surface 

Water/ 

sediment

Subsurface 

Soil

Groundwater

Source Release 

Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-Chart Continues

Partial / Possible Flow

Flow-Chart Stops

Incomplete Pathway

Potentially Complete Pathway

Complete Pathway

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Figure ES-2

Preliminary Conceptual Site Model

AASF, VA

PFAS in 

Surface Soil/

Surface 

Water

/ / / /

/ / / /

/ / / /

/ / / /

/ / / /

NOTES

1. The resident and recreational users refer to 

off-site receptors.

2. Inhalation of dust for off-site receptors is likely 

insignificant. 

3. Human consumption of fish potentially 

affected by PFAS is possible.

Site 

Worker

Construction 

Worker Resident1,2 Recreational User1,3

Site 

Worker

Construction 

Worker Resident1,2 Recreational User1,3

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1. Introduction

Authority and Purpose

The Army National Guard (ARNG)-Installations & Environment Division is the lead agency in 

performing Preliminary Assessments (PAs) and Site Inspections (SIs) for Perfluorooctanesulfonic 

acid (PFOS) and Perfluorooctanoic acid (PFOA) at Impacted Sites at ARNG Facilities Nationwide. 

This work is supported by the United States (US) Army Corps of Engineers (USACE) Baltimore 

District and their contractor AECOM Technical Services, Inc. (AECOM) under Contract Number 

W912DR-12-D-0014, Task Order W912DR17F0192, issued 11 August 2017.

The ARNG is assessing potential effects on human health related to processes at facilities that 

used per- and poly-fluoroalkyl substances (PFAS) (a suite of related chemicals), 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 lifetime Drinking Water Health 

Advisories (HAs) 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 

State of Virginia does not currently have drinking water standards for PFAS.

This report presents the findings of a PA for PFAS-containing materials at the Army Aviation 

Support Facility (AASF; also referred to as the “facility”) in Fort Belvoir, Virginia 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 [CFR] Part 300), and Army 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 available administrative record documents and Environmental Data Resources, 

Inc. (EDR)TM report packages to obtain information relevant to potential PFAS releases, such 

as: drinking water well locations, historical aerial photographs, Sanborn maps, and 

environmental compliance actions in the area surrounding the facility;

· Conducted a site visit on 18 October 2019 and completed visual site inspections (VSIs) at 

locations where PFAS-containing materials were suspected of being stored, used, or 

disposed;

· Interviewed current District of Columbia ARNG (DCARNG) personnel during the site visit; 
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· Identified Area(s) of Interest (AOIs) and developed a preliminary conceptual site model (CSM) 

to summarize potential source-pathway-receptor linkages of potential PFAS in soil, 

groundwater, surface water, and sediment for each AOI. 

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 as follows:

· 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 potential PFAS releases 

at the facility identified during the site visit 

· Section 4 – Emergency Response Areas: describes areas of potential PFAS release at the 

facility, specifically in response to emergency situations 

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

facility that are not under the control of ARNG 

· Section 6 – Preliminary 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 facility is located in an enclave of Davison Army Airfield (DAAF) at US Army Garrison Fort 

Belvoir, Fairfax County, Virginia. The facility occupies 25.15 acres of land along the southern 

flightline of DAAF. The address of the facility is listed as 5000 Britten Drive, Fort Belvoir, Virginia 

22060. Figure 1-1 illustrates the location of the AASF.

The facility is used for airfield operational functions and maintenance and storage for DCARNG 

rotary and fixed-wing aircraft. DCARNG began occupation of the property in 1972, and the 

licensing term has been extended until 2037. Property licensing agreements are included in 

Appendix A. 

Facility Environmental Setting

The surrounding property within DAAF includes aircraft hangars, industrial and administrative 

office buildings, concrete and asphalt pads, and landscaped areas currently used for the support 

of airfield activities (AECOM, 2018). Commercial areas are located west of the facility, and 

residential areas are located south of the facility. The general topography of the facility slopes 
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towards the north/northeast, and the topography ranges in elevations between 45 and 75 feet

above mean sea level.

1.5.1 Soil

The soils at the facility belong primarily to three soil associations: Urban Land Complex, LuntMarumsco Complex, and Hatboro Silt Loam. The Urban Land Complex soil series represents

areas that have been heavily altered or developed for construction. The Lunt-Marumsco Complex

and Hatboro Silt Loam are generally characterized as having poor drainage (Avatar and AECOM,

2018). Soils borings collected during a site characterization investigation at the adjacent Building

3233 in DAAF encountered a semi-confining clayey-sand layer at about 17 to 18 feet below

ground surface (bgs) (AECOM, 2018). Soil lithology near the surface consisted of varying

thicknesses of clayey to silty sand or sandy silt (Apex, 2014).

1.5.2 Geology

The facility is located on the upland subprovince of the Virginia Coastal Plain Physiographic

Province and is primarily underlain by the Quaternary estuarine deposits. The estuarine deposits

are characterized as moderately-well to poorly-graded sands and gravels grading to clayey to silty

sand with increasing depth (Fort Belvoir, 1994). The estuarine deposits are underlain by the

unconsolidated sediments of the Potomac Formation, which consist of thin to thick-bedded layers

of medium to coarse sand, silty clay, and gravelly sand (Figure 1-2) (AECOM, 2018).

1.5.3 Hydrogeology

A shallow unconfined aquifer underlies the facility and varies in thickness from three to eight feet.

The water bearing unit consists of moderately-well to poorly-graded sands and gravels (Fort

Belvoir, 1994). The clayey-sand layer encountered at about 20 feet bgs serves as a bounding unit

for vertical groundwater movement and likely corresponds to the lower boundary of the

unconfined aquifer (Apex, 2014; Fort Belvoir, 1994).

Regional groundwater flows generally to the northeast, following the surface water drainage.

However, localized groundwater flow may vary depending on the topography. For example, based

on a site characterization of the adjacent Building 3233, local groundwater flow was towards

Building 3233 due to a low depression area between Buildings 3233 and 3234. A horizontal

gradient of 0.04 was measured across the site, and groundwater was encountered ranging from

10 to 13 feet bgs (AECOM, 2018).

There are no drinking water wells within the facility. Potable water is supplied by the American

Water Company and is sourced from the Potomac River and Occoquan Reservoir (Virginia

American Water, n.d.). Based on the EDRTM report (Appendix A), there is one active public water

supply well indicated to lie approximately one mile north (downgradient) of the facility. Additional

wells classified as public/ municipal/ government, domestic, industrial, monitoring/ observation,

and unknown lie within a four-mile radius of the facility. Based on the USEPA Unregulated

Contaminant Monitoring Rule 3 (UCMR3) data, it was indicated that no PFAS were detected in a

public water system above the HAs within 20 miles of the facility. PFAS analyses performed in

2016 had method detection limits that were higher than currently achievable. Thus, it is possible

that low concentrations of PFAS were not detected during the UCMR3 sampling but might be

detected if analyzed today. Groundwater features are presented in Figure 1-2.
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1.5.4 Hydrology

Surface water drainage for the facility is generally in the northeast direction towards Accotink

Creek. Stormwater is conveyed through perennial streams or stormwater conveyance pipes that

both lead into an unnamed tributary of Accotink Creek. A stormwater basin is also located in the

area between Buildings 3121 and 3123 on the west side of the paved parking lot. The outfall point,

designated RO-002, is located near the intersection of Sanjer Drive and Ehlers Road and captures

drainage from other facilities and aircraft ramps within DAAF (SES, 2017). Surface water features

are presented in Figure 1-3.

1.5.5 Climate

The facility is in a humid subtropical climate zone, characterized by long and warm summers and

short and mild winters. Based on the monthly averages for Ronald Reagan Washington National

Airport, summer temperatures peak in July, with an average high temperature of 88 degrees

Fahrenheit (°F) and an average low temperature of 71 °F. Winter temperatures are lowest in

January, with an average high temperature of 43 °F and an average low temperature of 29 °F.

Rainfall is generally greater during the summer months but otherwise well distributed year-round,

with a normal annual precipitation of 39.7 inches (National Weather Service, 2020).

1.5.6 Current and Future Land Use

The facility houses airfield operational functions and provides maintenance and storage for

DCARNG rotary and fixed-wing aircraft. Related infrastructure consists of Building 3123, Aviation

Personnel Support Center/Readiness Center, and Building 3121, AASF Hangar, a paved parking

lot, and an aircraft ramp. Buildings 3123 and 3121 at DAAF are both leased to DCARNG.

Reasonably anticipated land use is not expected to change from the current land use.
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Facility Location

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Groundwater Features

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Surface Water Features

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2. Fire Training Areas

One FTA was identified through record reviews and interviews during the PA as described below. 

The FTA is shown on Figure 2-1.

Aircraft Ramp

Training sessions where personnel are instructed on how to use Purple K dry chemical fire 

extinguishers, also referred to as “familiarization training”, are conducted on the aircraft ramp in 

front of Building 3121. There are currently three Purple K fire extinguishers located on the aircraft 

ramp. The familiarization training is conducted annually and supervised by the DAAF fire marshal. 

According to the interviewed DCARNG personnel, smaller, handheld, dry chemical fire 

extinguishers are discharged in lieu of the Purple K fire extinguishers located on the ramp, and a 

firebox containing live fire is occasionally used for the training. 

Tri-MaxTM fire extinguishers were stored on the aircraft ramp prior to being replaced with Purple 

K fire extinguishers. The Tri-MaxTM fire extinguishers were never used or spilled according to the 

knowledge of the interviewees, which extends from 1989 to present. The DAAF Fire Department 

was responsible for maintaining the Tri-MaxTM fire extinguishers and conducting hydrostatic 

testing. The Tri-Maxes were turned into the Defense Logistics Agency (DLA) Disposition Services 

in 2012. Based on the disposal records located in Appendix A, there were 14 Tri-MaxTM fire 

extinguishers turned in, and a hydrostatic test was conducted in 2008. A Safety Data Sheet for 

BlastGuard 6% Synthetic Foam Concentrate was also included with the disposal records; 

however, it could not be confirmed if this material were used within the Tri-MaxTM fire extinguishers 

and if the material contained PFAS. Although PFAS are not listed on the Safety Data Sheet, the 

sheet only lists hazardous components and does not definitely state the BlastGuard 6% Synthetic 

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Fire Training Area

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3. Non-Fire Training Areas

In addition to FTAs, the PA evaluated areas where PFAS-containing materials may have been 

broadly used, stored, or disposed. This may include buildings with fire suppression systems, paint 

booths, AFFF storage areas, and areas of compliance demonstrations. Information on these 

features obtained during the PA are included in Appendices A and B. One non-FTA where AFFF 

was stored and/or potentially released was identified during the PA. A description of the non-FTA 

is presented below, and the non-FTA is shown on Figure 3-1. 

Building 3121 

Building 3121 is a 47,000-square foot maintenance hangar. The original section of Building 3121 

was constructed in 1981 and later expanded in 1985 (Avatar and AECOM, 2018). The 

northwestern portion of the hangar contains fixed-wing aircraft, and the southeastern portion 

contains rotary aircraft. Both portions are connected to an AFFF fire suppression system, which 

was installed during the original construction for the building. 

There are two AFFF tanks for the fire suppression system housed within a tank room in Building 

3121. The tanks are marked with dates indicating the levels within the tank to estimate the volume 

of AFFF leaking. Based on the markings, approximately 50 gallons of AFFF leaked from each 

tank, with both tanks originally containing about 300 gallons of AFFF. The markings also indicate 

that the tanks leaked AFFF beginning from August 2012 until June 2014. According to interviewed 

DCARNG personnel, the AFFF leakage was captured using absorbent mats placed underneath 

the two tanks; the disposal method for the absorbent mats is unknown. The leaks were caused 

by a corroded valve, and the valve was subsequently repaired in 2014. The type of AFFF leaked 

is unknown, but DCARNG personnel stated that the tanks have never been refilled. 

Weekly inspections of the AFFF fire suppression system are performed by a state technician, and 

monthly inspections are performed by a DAAF Fire Department personnel. According to 

interviewed DCARNG personnel, there have been several repairs to the fire pump and piping due 

to water leaks. The latest repair occurred in August 2019. 
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Non-Fire Training Area

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4. Emergency Response Areas

Emergency responses to crashes sometimes require flame suppression, which may result in the

release of PFAS to the environment in the form of AFFF. No emergency response areas were

identified within the facility during the PA through interviews with DCARNG personnel. The DAAF

Fire Department is the designated first responder for emergencies at the facility. A support

agreement between the US Army Garrison Fort Belvoir and the AASF is located in Appendix A.
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5. Adjacent Sources

A potential source of PFAS adjacent to the facility, not under the control of the DCARNG, was 

identified during the PA. A description of the adjacent source is presented below, and the adjacent 

source is shown on Figure 5-1.

US Army Garrison Fort Belvoir

The property surrounding the facility is under the control of US Army Garrison Fort Belvoir, which 

is being investigated under a separate PFAS PA Program. Notable incidents at US Army Garrison 

Fort Belvoir that may have resulted in the release of PFAS include the 2018 Lakota Hangar 

(Building 3140) deluge system release and a 1984 army aircraft crash south of DAAF (UPI 

Archives, 1984). According to the incident report for the Lakota Hangar deluge system release 

(Appendix A), 324 gallons of Ansul Jet X 2% High Expansion Foam Concentrate were released 

during an accidental activation of the deluge system on 17 May 2018. The foam ran out of the 

hangar and into the stormwater conveyance system and runway. The foam was cleaned from the 

site using vacuum trucks and Frac tanks and was subsequently sent to Waste Management 

Bethel Landfill in Hampton, Virginia for disposal. 
Fort Belvoir

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12420 Milestone Center Drive

Germantown, MD 20876

Adjacent Sources

Base Map: Virginia Geographic Information Network

(VGIN)

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\DC\AASF_Ft_Belvoir_Figures\AASF_Ft_Belvoir_PA_Figures\Fig_5-1_AASF_Ft_Belvoir_Adjacent_Sources.mxd

Legend

Potential PFAS Release

Approximate Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

0 2,150 4,300 8,600

Feet

Army Aviation Support Facility

17
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

18

6. Preliminary Conceptual Site Model

Based on the PA findings, one area was identified at the facility where AFFF may have been 

stored or expended: AOI 1 Building 3121 and Aircraft Ramp. As such, this area is determined to 

be an AOI and may be a potential PFAS source area. The AOI location is shown in Figure 6-1.

The following section describe the CSM components and the specific preliminary CSM developed 

for AOI 1. 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. The preliminary CSM for AOI 1 is shown in Figure 6-2. 

Human exposure via the dermal contact pathway may occur, and current risk practice suggests it 

is an insignificant pathway compared to ingestion; however, exposure data for dermal pathways 

are sparse and continue to be the subject of PFAS toxicological studies (National Ground Water 

Association, 2018). Receptors at the facility include site workers, construction workers, residents, 

and recreational users. The preliminary CSM for the facility indicates which specific receptors 

could potentially be exposed to PFAS. 

AOI 1: Building 3121 and Aircraft Ramp

AOI 1 includes one non-FTA and one FTA: Building 3121 and the aircraft ramp, respectively. 

AFFF leaked from fire suppression system tanks in Building 3121, and Tri-MaxTM fire 

extinguishers potentially containing AFFF were stored on the aircraft ramp. 

AFFF releases at Building 3121 were captured by absorbent pads that were disposed of in an 

unspecified manner. There are also trench drains located in Building 3121 that lead into a 2,000-

gallon oil water separator. According to interviewed DCARNG personnel, the resulting discharge 

from the oil water separator leads into the sanitary sewer, and the oil water separator is serviced 

annually by American Water Company. Direct exposure pathways to receptors are unlikely due to 

the secondary containment and treatment of wastewater.

Potential AFFF releases on the aircraft ramp would have occurred primarily on paved surfaces 

but may run-off into unpaved surfaces. PFAS releases carried by run-off into surface soil may 

have infiltrated the subsurface soil. PFAS releases may have also infiltrated the subsurface soil 

via cracks in the pavement or in joints between areas that are paved with different materials. 

Ground-disturbing activities to soil at AOI 1 could result in construction worker exposure to 

potential PFAS contamination via inhalation of dust or ingestion of surface and subsurface soil. 

Inhalation of dust or ingestion of surface soil may also occur during the routine activities of site 

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

potentially complete. The inhalation of dust for off-facility residents and recreational users of 

Accotink Creek is also a potentially complete pathway, although the exposure is likely 

insignificant. 

PFAS releases carried by run-off likely drain downslope into tributaries of Accotink Creek. Offfacility receptors, such as residents and recreational users, may be exposed to PFAS via ingestion 

of surface water and sediment in Accotink Creek or via the ingestion of fish affected by PFAS. 

The on-facility presence of a stormwater basin near Building 3121 presents a potentially complete 

exposure pathway to site workers and construction workers via ingestion of surface water and 

sediment. 

PFAS are water soluble and can migrate readily from soil to groundwater via leaching. No 

groundwater wells exist at the facility, and the facility receives potable water from American Water 

Company, which sources its water from the Potomac River and Occoquan Reservoir (Virginia 

American Water, n.d.). Both sources of water are greater than five miles away and are unlikely 
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

19

impacted by PFAS releases from AOI 1. However, a public water supply well is located

approximately 1 mile north of the facility and may be impacted by PFAS in groundwater; therefore, 

the groundwater ingestion pathways are potentially complete for residents. Groundwater at the

facility is present at shallow occurrences (less than 15 feet bgs), so the groundwater ingestion

pathway is potentially complete for construction workers under trenching scenarios. The

preliminary CSM for AOI 1 is shown on Figure 6-2.
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12420 Milestone Center Drive

Germantown, MD 20876

Area of Interest

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

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

\\URSGermantown.us.ie.urs\Germantown\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\DC\AASF_Ft_Belvoir_Figures\AASF_Ft_Belvoir_PA_Figures\Fig_6-1_AASF_Ft_Belvoir_AOIs.mxd

Legend

Area of Interest

Potential PFAS Release

Approximate Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

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Inferred Groundwater Flow Direction

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Fort Belvoir

Fort Belvoir

Accotink Creek

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20
SOURCE PATHWAY RECEPTOR

AOI 1

AFFF release 

from Tri-Max/fire 

suppression 

system leaks

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ 

Infiltration

Airborne Soil 

particulate

Surface Soil 

at AOI

Surface 

Water/ 

sediment

Subsurface 

Soil

Groundwater

Source Release 

Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-Chart Continues

Partial / Possible Flow

Flow-Chart Stops

Incomplete Pathway

Potentially Complete Pathway

Complete Pathway

LEGEND

Figure 6-2

Preliminary Conceptual Site Model

AASF, VA

PFAS in 

Surface Soil/

Surface 

Water

/ / / /

/ / / /

/ / / /

/ / / /

/ / / /

NOTES

1. The resident and recreational users refer to 

off-site receptors.

2. Inhalation of dust for off-site receptors is likely 

insignificant. 

3. Human consumption of fish potentially 

affected by PFAS is possible.

Site 

Worker

Construction 

Worker Resident1,2 Recreational User1,3

Site 

Worker

Construction 

Worker Resident1,2 Recreational User1,3

21
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

22

7. Conclusions

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

storage of AFFF and other PFAS-related activities at the facility. The PA findings are based on the 

information presented in Appendix A and Appendix B.

Findings

One AOI related to potential PFAS release was identified (Table 7-1) at the facility during the PA 

(Figure 7-1):

Table 7-1: AOIs at the AASF

Area of Interest Name Used by Potential Release 

Date

AOI 1 Building 3121 and 

Aircraft Ramp

DCARNG Unknown

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

contamination in media at or near the facility. The preliminary CSM for the facility, which presents 

the potential receptors and media impacted, is shown on Figure 6-2. 

One potential off-facility source of PFAS, US Army Garrison Fort Belvoir, was considered in the 

local area surrounding the AASF through interviews or review of previous environmental 

investigations. US Army Garrison Fort Belvoir is being investigated under a separate PFAS PA 

Program.

Uncertainties

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 the facility. Historically, 

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

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

training, firefighting, other non-traditional activities, or on its disposition. 

The conclusions of this PA are based on all available information, including: previous 

environmental reports, EDRsTM, observations made during the VSI, and interviews. Interviews of 

personnel with direct knowledge of a facility generally provided the most useful insights regarding 

a facility's historical and current PFAS-containing materials. Sometimes, the provided information 

was vague or conflicted with site observations. 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 were first used (1969 to present), 

and a reliance on personal recollection. Inaccuracies may arise in potential PFAS release 

locations, dates of release, volume of releases, and the concentration of AFFF used. 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, current personnel were interviewed, multiple persons were interviewed 

for the same potential source area, and potential source areas were visually inspected.

The following Table 7-2 summarizes the uncertainties associated with the PA:
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

23

Table 7-2: Summary of Uncertainties

Area of Interest Source of Uncertainty

AOI 1: Building 3121 

and Aircraft Ramp 

A Safety Data Sheet for BlastGuard 6% Synthetic Foam 

Concentrate was included with the Tri-MaxTM fire extinguisher 

disposal records (Appendix A); however, it could not be confirmed 

if this material were used within the Tri-MaxTM fire extinguishers and 

if the material contained PFAS. Although PFAS are not listed on its 

Safety Data Sheet, the sheet only lists hazardous components and 

does not definitely state the BlastGuard 6% Synthetic Foam 

Concentrate does not contain PFAS.

The type of AFFF leaked from the fire suppression system tanks in 

Building 3121 is unknown. Absorbent mats placed underneath the 

tanks were used to catch the AFFF leaks, but the disposal method 

for the absorbent mats is unknown.

General Due to the limitation of interviewee knowledge, facility operations 

from 1972 (when ARNG began occupying the facility) to 1989 are 

unknown. 

US Army Garrison Fort Belvoir is being investigated under a 

separate PFAS PA Program. However, the findings of the 

investigation have not been made available as to date of this report. 

Potential Future Actions

Interviews and records (covering 1989 to present) indicate that current or former ARNG activities 

may have resulted in potential PFAS releases at one AOI identified during the PA. Based on the 

preliminary CSM developed for the AOI, there is potential for receptors to be exposed to PFAS 

contamination in soil, groundwater, surface water, and sediment at the AOI. Table 7-3 summarizes 

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

CERCLA process and undergo an SI. 

Table 7-3: PA Findings Summary

Area of Interest AOI Location Rationale Potential Future 

Action

AOI 1: Building 

3121 and Aircraft 

Ramp

38°42’56.3”N; 

77°11’06.2”W

AFFF leaked from fire 

suppression system tanks in 

Building 3121. Tri-MaxTM 

fire extinguishers potentially 

containing AFFF were 

stored on the aircraft ramp.

Proceed to an SI, 

focus on soil, 

groundwater, surface 

water, sediment

ARNG will evaluate the need for an SI at the AASF based on the potential receptors, the potential 

migration of PFAS contamination off the facility, and the availability of resources. 
Aircraft Ramp

Building 3121

AOI 1

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Summary of Findings

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

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

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Legend

Area of Interest

Potential PFAS Release

Approximate Facility Boundary

Wetland

River/Stream

0 125 250 500

Feet

Fort Belvoir

Fort Belvoir

24
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

25

8. References

AECOM Technical Services, Inc. 2018. (AECOM, 2018). Final Building 3233 Site Characterization

Report Addendum, U.S. Army Garrison Fort Belvoir. November.

Apex Companies, LLC. 2014 (Apex, 2014). Site Characterization Report, Davidson Airfield,

Building 3233, DEQ PC # 2014-3100. Fort Belvoir, Virginia. October 22.

Avatar Environmental and AECOM Technical Services, Inc. 2018. (Avatar and AECOM, 2018).

Fort Belvoir Davison Army Airfield Area Development Plan. January.

National Ground Water Association, 2018. Groundwater and PFAS: State of Knowledge and

Practice. January.

National Weather Service, 2020. DCA Normals, Means, and Extremes.

https://www.weather.gov/lwx/dcanme (Accessed January 2020).

SES Construction and Fuel Services, LLC. 2017. (SES, 2017). Davison Army Airfield, Facility

SWPPP. July.

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

Preliminary Assessments under CERCLA. September.

UPI Archives, 1984. “An Army executive aircraft crashed short of a runway...”

https://www.upi.com/Archives/1984/12/12/An-Army-executive-aircraft-crashed-short-of-arunway/5663471675600/ (Accessed January 2020).

US Army, Fort Belvoir, Directorate of Engineering and Housing, 1994. (Fort Belvoir, 1994). Closure

Plan, Davison Army Airfield, Fire Training Facility. September.

Virginia American Water, n.d. Alexandria System. https://amwater.com/vaaw/about-us/virginiawater-systems/alexandria-system (Accessed January 2020).
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix A

Data Resources
PFAS Preliminary Assessment Report

Army Aviation Support Facility,

Fort Belvoir, VA

Data resources will be provided separately on CD. Data resources for Army Aviation Support

Facility include:

Environmental Data Resources, Inc.TM Geocheck Report

• 2019 Environmental Data Resources, Inc.TM Geocheck Report for Fort Belvoir, VA

DCARNG Leasing Records

• 1972 License for National Guard Purposes, No. DACA-31-3-75-216

• 1987 Supplemental Agreement No. 1 to Department of the Army License No. DACA-31-3-

75-216

• 2012 License No. DACA-31-12-092, Department of the Army License for National Guard

Purposes, Year Round Training and Support Center, Fort Belvoir, Fairfax County, Virginia

DCARNG Support Agreements

• 1997 Support Agreement No. W26AAA-96100-847

• 2010 Support Agreement No. W26AAA-10144-847

Previous Environmental Investigations

• 1992 Interim Hydrogeologic Study Report, Davison Army Airfield Fire Training Site

• 1998 Ground-water Monitoring Well Closure Report, The Davison Army Airfield Fire Training

Area

• 1998 Quarterly Groundwater Sampling, Fire Training Area, Davison Army Airfield, Fort

Belvoir

• 1994 Closure Plan, Davison Army Airfield, Fire Training Facility

• 2002 Corrective Action Monitoring Report – First Quarter 2002, Building 3161

• 2012 RCRA Corrective Action, No Further Action Closure Document, Solid Waste

Management Units, Main Post, U.S. Army Garrison Fort Belvoir, Virginia

• 2013 Corrective Action Monitoring Reports for Third Quarter 2013

• 2018 Final Building 3233 Site Characterization Report Addendum

Miscellaneous Information

• 2012 Tri-Max Disposal Records

• 2014 Fort Belvoir Integrated Cultural Resources Management Plan

• 2017 Facility SWPPP, Davison Army Airfield

• 2017 Notice of Fire Prevention Code Violation at Aircraft Hangar (DCNG)

• 2018 Fort Belvoir Davison Army Airfield Area Development Plan

• 2018 Fort Belvoir Integrated Natural Resources Management Plan

• 2018 General VPES Permit for Discharges of Stormwater from Small Municipal Separate

Storm Sewer Systems, General Permit No.: VAR040093

• 2018 USEPA Spill Incident Report Form for DAAF, 6956 Britten Drive (Bldg. 3140, Lakota

Hangar)
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix B

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix B.1

Interview Records
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

Interviewee:___see below_______________

Title:__________________________________

Phone Number:_________________________

Email:_______________________________

Can your name/role be used in the PA Report? Y or N 

Can you recommend anyone we can interview?

Y or N __________________________

1. Roles or activities with the Facility/years working at the Facility.

CW3 Maintenance Officer since 1989 (30 years)

CW2 – pilot and AASF ALSE Officer since 2009 (10 years)

2. Where can I find previous facility ownership information?

There are 7 units stationed at the AASF. They have both fixed wing and rotary wing aircraft. They are tenants 

of the Fort Belvoir Davison Army Airfield. All units will attend training at the same time. 

3. What can you tell us about the history of PFAS including aqueous film forming foam (AFFF) at the

Facility? Was it used for any of the following activities, circle all that apply and indicate years of active

use, if known? Identify these locations on a facility map.

Maintenance

Fire Training Areas

Firefighting (Active Fire)

Crash

Fire Suppression Systems (Hangers/Dining Facilities)

Fire Protection at Fueling Stations

Non-Technical/Recreational/ Pest Management

Metals Plating Facility

Waterproofing Uniforms (Laundry Facilities)

Other

AFFF deluge system was never released. They had Tri-Maxes on airfield managed through Fort Belvoir 

DAAF but Tri-Maxes were never used to their knowledge. Tri-Maxes were turned in to the National Forest 

Registry in 2012. DAAF would have been responsible for performing maintenance on Tri-Maxes and 

hydrostatic testing. 

4. Fill out CSM Information worksheet with the Environmental Manager.

5. Are any current buildings constructed with AFFF dispensing systems or fire suppression systems?

What are the AFFF/suppression system test requirements? What is the frequency of testing the

AFFF/suppression system? Do you have “As Built” drawings for the buildings?
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

Both hangars in Building 3121 are connected to same AFFF deluge system. A state technician comes 

weekly for inspection of deluge system but they are unsure if there’s any sensor testing or trips 

involved in testing. The deluge system was constructed with the building on July 6, 1981. There was 

an addition made to the building in 1985. 

There’s some corrosion on the pipes and evidence of leakage from AFFF tanks and water pump. The 

system was shut down and underwent maintenance in August 2019 to repair the water pump. There 

have been several repairs on the pump and piping. The technician stated there was always a leak. Pipe 

analysis was performed between June and July 2019. They believe nobody was refilling the AFFF 

tank. 

6. Are fire suppression systems currently charged with AFFF or have they been retrofitted for use of

high expansion foam? If retrofitted, when was thatdone?

Currently charged. Unknown about retrofitting

7. How is AFFF procured? Do you have an inventory/procurement system that tracks use?

Unknown

8. What type of AFFF has been/is being used (3%, 6%, Mil Spec Mil-F-24385, High Expansion)?

Manufacturer (3M, Dupont, Ansul, National Foam, Angus, Chemguard, Buckeye, Fire Service Plus)?

Unknown

9. Where is the AFFF stored? How is it stored (tanks, 55-gallon drums, 5-gallon buckets)? What

size are the storage tanks? Is the AFFF stored as a mixed solution (3% or 6%) or concentrated

material?

Unknown
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

10. How many FTAs are/were on this facility and where are they? Locate on a map. How many FTAs

are active and inactive? For inactive FTAs, when was the last time that fire training using AFFF

was conductedat them?

They do familiarization training on ramp outside with fire marshall annually. Training involves being 

instructed on how to use the fire extinguishers outside (Purple K), but then they will actually discharge 

using smaller handheld extinguishers, presumably of the same kind. Sometimes they will discharge 

into a firebox that is on fire. 

11. When a release of AFFF occurs during a fire training exercise, now and in the past, how is the

AFFF cleaned and disposed of? Were retention ponds built to store discharged AFFF? Was the

AFFF trickled to the sanitary sewer or left in the pond to infiltrate?

AFFF leakage from deluge system was captured using absorbent mats and then presumably disposed of in 

proper manner. There are drains in the tank room and in hangar. It is believed at least the drains in the 

hangar go into an OWS and then the sanitary sewer. The OWS is pumped annually by American Water Co. 

12. Can you recall specific times when city, county, and/or state personnel came on-post for training? If so,

please state which state/county agency or military entity? Do you have any records, including

photographs to share with us?

Each unit is responsible for own training and everything is all internal. 

13. Did military routinely or occasionally fire train off-post? List the units that you can recall used/trained

at various areas.

Unknown

14. Did individual units come with their own safety personnel, did they also bring their own AFFF? Was

training with AFFF part of these exercises? How were emergencies handled under these circumstances?

N/A
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

15. Are there specific emergency response incident reports (i.e., aircraft or vehicle

crash sites and fires)? If so, may we please copy these reports? Who (entity) was

the responder?

Not known. Fire department on DAAF responds to emergencies. 

16. Do you have records of fuel spill logs? Was it common practice to wash away fuel spills with

AFFF? Is/was AFFF used as a precaution in response to fuel releases or emergency runway

landings to preventfires?

N/A

17. Was AFFF used for forest fires or fire management on-post/off-post? If so, please describe what

happened and who was involved?

N/A

18. Are there mutual aid/use agreements between county, city, and local fire department? Please list, even

if informal. If formalized, may we have a copy of the agreement?

Not known. There are also Main Post fire personnel that can come to respond to fire emergencies. 

19. Can you provide any other locations where AFFF has been stored, released, or used (i.e. hangars,

buildings, fire stations, firefighting equipment testing and maintenance areas, emergency response

sites, storm water/surface water, waste treatment plants, and AFFF ponds)?

Unknown
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

20. Are you aware of any other creative uses of AFFF? If so, how was AFFF used? What entities were

involved?

No

21. Are there past studies you are aware of with environmental information on plants/animals/

groundwater/soil types, etc., such as Integrated Cultural Resources Management Plans or Integrated

Natural Resources Management Plans?

N/A

22. What other records might be helpful to us (environmental compliance, investigation records, admin

record) and where can we find them?

N/A

23. Do you have or did you have a chrome plating shop on base? What were/are the years of operation

of that chrome plating shop?

No

24. Do you know whether the shop has/had a foam blanket mist suppression system or used a fume

hood for emissionscontrol? If foam blanket mist suppression was used, where was the foam

stored, mixed, applied, etc.?

No
PA Interview Questionnaire - Environmental Manager Facility:__AASF DAAF Ft. Belvoir_ 

Interviewer:__ST____________

Date/Time:___10/18/19________

25. How is off-spec AFFF disposed (used for training, turned in, or given to a local Fire Station)? If

applicable, do you know the name of the vendor that removes off-spec AFFF? Do you have copies of

the manifest or B/L?

Unknown

26. Do you recommend anyone else we can interview? If so, do you have contact information for them?
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix B.2

Visual Site Inspection Checklists




PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix B.3

Conceptual Site Model Information
Preliminary Assessment – Conceptual Site Model Information

Site Name: DCARNG AASF

Why has this location been identified as a site?

Identified leaking AFFF tanks at previous VSI conducted by Arcadis for US Army Garrison Fort Belvoir

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

The AASF is an enclave of US Army Garrison Fort Belvoir, and activities from Fort Belvoir may impact 

the AASF

Training Events

Have any training events with AFFF occurred at this site? training events with dry chemical (non-AFFF) 

extinguishers

If so, how often? Annually

How much material was used? Is it documented? Not documented

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? Northeast

Average rainfall? 40 inches

Any flooding during rainy season? No

Direct or indirect pathway to ditches? Indirect

Direct or indirect pathway to larger bodies of water? indirect

Does surface water pond any place on site? yes

Any impoundment areas or retention ponds? Yes

Any NPDES location points near the site? yes, outfall on unnamed tributary to Accotink Creek

How does surface water drain on and around the flight line? Carried through open channels or stormwater 

conveyance pipes
Preliminary Assessment – Conceptual Site Model Information

Groundwater:

Groundwater flow direction? Northeast

Depth to groundwater? 10-13 ft bgs

Uses (agricultural, drinking water, irrigation)? No groundwater use on facility

Any groundwater treatment systems? No

Any groundwater monitoring well locations near the site? yes, near Building 3233

Is groundwater used for drinking water? potentially yes off facility

Are there drinking water supply wells on installation? No 

Do they serve off-post populations? No

Are there off-post drinking water wells downgradient? Potentially yes

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? N/A

Is surface water from potential contaminated sites treated? N/A

Equipment Rinse Water

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

N/A

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?

N/A

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 areas to south, commercial areas to the west, Davison Army Airfield

Documentation

Ask for Engineering drawings (if applicable).

Has there been a reconstruction or changes to the drainage system? When did that occur?
PFAS Preliminary Assessment Report

Army Aviation Support Facility

Fort Belvoir, Virginia

Appendix C

Photographic Log
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Army Aviation Suport Facility Fort Belvoir, Virginia

Preliminary Assessment Report

Army Aviation Suport Facility

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 1

Description:

Two AFFF tanks are shown in

the tank room of Building

3121.

Orientation:

Northwest

Date 10/18/2019

Time 11:19

Photograph No. 2

Description:

The AFFF tanks have a

history of leaking. The AFFF

levels in the first tank are

marked from August 2012 to

June 2014.

Orientation:

East

Date 10/18/2019

Time 11:13

AECOM Page 1 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Army Aviation Suport Facility Fort Belvoir, Virginia

Preliminary Assessment Report

Army Aviation Suport Facility

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 3

Description:

The AFFF tanks have a

history of leaking. The AFFF

levels in the second tank are

marked from September 2012

to June 2014.

Orientation:

Southeast

Date 10/18/2019

Time 11:14

Photograph No. 4

Description:

The fire pump has a history of

leaking water and is shown in

the tank room of Building

3121.

Orientation:

Northwest

Date 10/18/2019

Time 11:14

AECOM Page 2 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Army Aviation Suport Facility Fort Belvoir, Virginia

Preliminary Assessment Report

Army Aviation Suport Facility

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 5

Description:

Building 3121 has an

overhead AFFF fire

suppression system in the

hangar.

Orientation:

East

Date 10/18/2019

Time 11:19

Photograph No. 6

Description:

Trench drains are located on

the perimeter of the hangar

floor in Building 3121. The

trench drains lead into an oil

water separator.

Orientation:

Southeast

Date 10/18/2019

Time 11:26

AECOM Page 3 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Army Aviation Suport Facility Fort Belvoir, Virginia

Preliminary Assessment Report

Army Aviation Suport Facility

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 7

Description:

Three Purple K dry chemical

fire extinguishers (non-AFFF)

are located on the aircraft

ramp outside Building 3121.

Orientation:

West

Date 10/18/2019

Time 11:27

Photograph No. 8

Description:

The aircraft ramp is shown.

Orientation:

Northwest

Date 10/18/2019

Time 11:31

AECOM Page 4 of 4