FINAL

Preliminary Assessment Report

Army Aviation Support Facility 

Concord

Concord, New Hampshire

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

November 2019

Prepared for:

Army National Guard Headquarters

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

AASF Concord

Concord, New Hampshire

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Table of Contents

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

1. Introduction ........................................................................................................................5

Authority and Purpose ..............................................................................................5

Preliminary Assessment Methods .............................................................................5

Report Organization ..................................................................................................6

Facility Location and Description...............................................................................6

Facility Environmental Setting ...................................................................................7

1.5.1 Geology .........................................................................................................7

1.5.2 Hydrogeology .................................................................................................8

1.5.3 Hydrology .......................................................................................................8

1.5.4 Climate ...........................................................................................................9

1.5.5 Current and Future Land Use .........................................................................9

2. Fire Training Areas ...........................................................................................................13

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

Fire Suppression System Releases ........................................................................15

System Testing Area ...............................................................................................16

Fire Extinguishers ...................................................................................................16

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

5. Adjacent Off-Facility Sources ...........................................................................................21

State Military Reservation .......................................................................................21

Concord Municipal Airport .......................................................................................21

City of Concord Fire Department.............................................................................21

Richard M. Flynn Fire Academy ..............................................................................22

Loudon Road Fire Training Area .............................................................................22

New Hampshire Detections .....................................................................................23

6. Preliminary Conceptual Site Model ..................................................................................25

AOI 1 Fire Suppression System Releases ..............................................................25

AOI 2 System Testing Area .....................................................................................26

AOI 3 Infiltration Gallery ..........................................................................................26

7. Conclusions .....................................................................................................................31

Findings ..................................................................................................................31

Uncertainty .............................................................................................................31

Potential Future Action ............................................................................................32

8. References ......................................................................................................................35
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

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Tables

Table 7-1 AOIs at AASF Concord

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 Preliminary Conceptual Site Model AASF Concord

Figure 1-1 Facility Location

Figure 1-2 Groundwater Features

Figure 1-3 Surface Water Features

Figure 3-1 Non-Fire Training Areas

Figure 5-1 Adjacent Sources

Figure 6-1 Areas of Interest

Figure 6-2 Preliminary Conceptual Site Model AOI 1 Fire Suppression System Releases

and AOI 2 System Testing Area

Figure 6-3 Preliminary Conceptual Site Model AOI 3 Infiltration Gallery

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 Photograph Log
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Concord, New Hampshire

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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

AGQS ambient groundwater quality standard

amsl above mean sea level

AOI area of interest

ARNG Army National Guard

bgs below ground surface

CERCLA Comprehensive Environmental Response, Compensation, and Liability Act

CSM conceptual site model

EDR Environmental Data Resources, Inc.

FTA fire training area

HA Health Advisory

MCL maximum contaminant level

NGB National Guard Bureau

NHARNG New Hampshire Army National Guard

NHDES New Hampshire Department of Environmental Services

NHDOS New Hampshire Department of Safety

OWS oil-water separator

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFHxS perfluorohexanesulfonic acid

PFNA perfluorononanoic acid

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

ppt parts per trillion

SI Site Inspection

SMR State Military Reservation

UCMR 3 Third Unregulated Contaminant Monitoring Rule

US United States

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

VSI visual site inspection
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

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Executive Summary

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

Army National Guard (ARNG)-Installations and 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 (AASF) in Concord, New

Hampshire, 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 22 April 2019;

· Interviewed current New Hampshire ARNG (NHARNG) personnel at AASF Concord,

NHARNG environmental managers and operations staff, and former AASF employees

during the site visit;

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

documented with photographs; and

· Developed preliminary conceptual site models (CSMs) to outline the potential release and

pathway of PFAS for the Areas of Interest (AOIs) and the facility (Figure ES-1).

Three AOIs related to potential PFAS release were identified at the AASF Concord during the PA.

These AOIs are shown on Figure ES-1 and described in Table ES-1 below:

Table ES-1: AOIs at AASF Concord

Area of Interest Name Used by Release Dates

AOI 1 Fire Suppression System

Releases

NHARNG 2005 - 2019

AOI 2 System Testing Area NHARNG 2005

AOI 3 Infiltration Gallery NHARNG 2005

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

PFAS contamination in media at or near the facility. The preliminary CSM for the Concord AASF,

which presents the potential receptors and media impacted, is shown on Figure ES-2.
Infiltration Gallery

System Testing Area

Fire Supression

System Releases

Concord Municipal

Airport

State Military Reservation 

(PA Report under separate cover)

City of Concord Fire

Department, Heights Station

Loudon Road Fire

Training Area

Richard M. Flynn

Fire Academy

Fire Extinguisher

Fire Extinguisher

AOI 1

AOI 2

AOI 3

FrenchsB ro ok

Merrimack River

Soucook River

Merrimack River

Souc ook River

0 750 1,500 3,000

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Storm Sewer Line

Retention Basin

Summary of Findings

Figure ES-1

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1:18,000 ­ 12420 Milestone Center Drive

Germantown, MD 20876

Base Map: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus

DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

2
Media

SOURCE PATHWAY RECEPTOR

AOI 1 

AOI 2

AOI 3

Hangar Fire 

Suppression 

System Releases; 

System Testing; 

Releases from 

Infiltration Gallery

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

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-Chart Continues

Partial / Possible Flow

Flow-Chart Stops

Incomplete Pathway

Potentially Complete Pathway

Complete Pathway

Site Worker Construction Worker Resident Trespasser/ Recreational User

Site Worker Construction Worker Resident Trespasser/ Recreational User LEGEND

Figure ES-2

Preliminary Conceptual Site Model

AASF Concord

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

/

/ /

/ /

/ /

/

/

/

/

/

/

/ /

/

/

/

/ /

NOTES

1. The resident receptor refers to an offsite resident. 

2. No surface water bodies were 

identified at the facility, but the surface 

water/sediment pathway is considered 

potentially complete for offsite 

recreational users due to the potential 

for groundwater interaction with the 

downgradient river.

3. Human consumption of fish 

potentially affected by PFAS from the 

downgradient river is possible.

3
PFAS Preliminary Assessment Report

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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 and 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-D0014, 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 (HAs) of 70 parts per trillion (ppt), individually or combined, for PFOA and PFOS in 

May 2016, but there are currently no promulgated national standards regulating PFAS in drinking 

water (USEPA, 2016a; USEPA, 2016b). In the absence of federal maximum contaminant levels 

(MCLs), some states have adopted their own drinking water standards for PFAS. In June 2019, 

the New Hampshire Department of Environmental Services (NHDES) issued Final Proposed 

MCLs and Ambient Groundwater Quality Standards (AGQSs) for four PFAS compounds. The 

drinking water rule amendments were subsequently adopted by the New Hampshire Joint 

Legislative Committee on Administrative Rules to be effective on 30 September 2019 (New 

Hampshire Code of Administrative Rules, 2019). The MCLs/AGQSs are as follows:

· PFOA: 12 ppt

· PFOS: 15 ppt

· PFHxS: 18 ppt

· PFNA: 11 ppt

This report presents findings of a PA for PFAS at the Army Aviation Support Facility (AASF; also 

referred to as the “facility”) in Concord, New Hampshire, in accordance with the Comprehensive 

Environmental Response, Compensation, and Liability Act (CERCLA; USEPA, 1980), as 

amended, the National Oil and Hazardous Substances Pollution Contingency Plan (40 Code of 

Federal Regulations Part 300; USEPA, 1994), and USACE requirements and guidance.

This PA documents the known 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: 
PFAS Preliminary Assessment Report

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Concord, New Hampshire

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

· Conducted a site visit on 22 April 2019;

· Interviewed current New Hampshire ARNG (NHARNG) personnel at AASF Concord,

NHARNG environmental managers and operations staff, and former AASF employees

during the site visit;

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

documented with photographs; and

· Developed preliminary conceptual site models (CSMs) 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 Fire Training Areas (FTAs) at the facility

identified during the site visit, if present.

· 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, if present.

· Section 5 – Adjacent Sources: describes sources of 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 AASF Concord is located at 26 Regional Drive in Concord, Merrimack County, New 

Hampshire (Figure 1-1). The facility is near the southeastern city limits, east of Interstate 93 and 

south of Interstate 393. The approximate center of the property is located at geographic 

coordinates 43°12'33.50"N; 71°30'8.21”W longitude at 346 feet above mean sea level (amsl). 
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Concord, New Hampshire

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The NHARNG, by and through the Office of the Adjutant General, entered a lease with the city of 

Concord in 2002 for the use and occupancy of 26 acres of land adjacent to the Concord Municipal 

Airport for 50 years (Appendix A). Prior to this time, the property was an undeveloped section of 

the Concord Municipal Airport. The current AASF building was constructed between 2003 and 

2004, and in 2004, the NHARNG moved AASF operations to the newly-constructed AASF from 

the previous location at the State Military Reservation (SMR). The AASF building occupies 98,900 

square feet and consists of administrative offices, a hangar for the storage and maintenance of 

helicopters, a building for the maintenance and storage of fueling trucks, a jet fuel storage and 

filling area, and a hangar apron connected to the Concord Municipal Airport airfield (Tighe & Bond, 

2018). 

The AASF Concord is home to two Aviation Regiments and an Operational Support Airlift 

Detachment, which operates rotary-winged aircraft such as helicopters for the NHARNG. 

Operations at the AASF Concord include aviation training and maintenance, modification, and 

repair of rotary-winged aircraft. The AASF is a closed facility to the public, with a 6-foot chain-link 

fence surrounding the facility. Access to the facility is through a locked gate that requires an 

electronic security badge. 

Facility Environmental Setting

The AASF Concord is located within the Merrimack Valley in southern New Hampshire, within the 

Eastern New England Upland Physiographic Province of the Appalachian Highlands. The New 

England Upland consists of a maturely-dissected plateau with narrow valleys, and the entire area 

was greatly modified by glaciation. The city of Concord developed along the Merrimack River and 

lies fully within the Merrimack River watershed. The city of Concord has a population of 

approximately 43,000 people, according to the 2017 census (US Census, 2018).

The topography of the facility and in the surrounding area is relatively flat. The topographic high 

of the facility (approximately 345 feet amsl) is located west of the main hangar, on a hill 

constructed for aircraft landing practice. Much of the facility is paved with either asphalt or 

concrete, with unpaved grassy areas along the boundaries of the facility.

The following sections describe the environmental setting of the subject property and include 

information on geology, hydrogeology, hydrology, climate, and current and future land use.

1.5.1 Geology

Regional geology consists of unconsolidated glacial material overlying igneous and metamorphic 

rocks that was deposited during the Wisconsin stage of glaciation, of the Pleistocene Epoch 

during the Quaternary Period. The weight of the ice caused differential depressions of the land 

surface during the Pleistocene Epoch. The southeastward flow of glacial ice scoured the rock 

surface, and as the ice melted, it deposited a thick blanket of glacial till in many areas. Meltwater 

streams deposited a variety of ice-contact sands and gravels upon portions of the till sheet 

(USAEHA, 1993). Geologic features in the vicinity of the facility are shown on Figure 1-2.

The unconsolidated material, which is mainly ground moraine, was originally subglacial till that 

was left scattered over the ground after the ice melted. A ground moraine consists of scattered 

boulders, combined with cobbles, gravel, pebbles, sand, silt, and clay, with some areas of icecontact stratified drift. This stratified drift was derived from englacial and subglacial meltwater 

streams that also carried gravel, sand, silt, and clay. The shallowest layer is an approximately 25- 

to 50-foot-thick lacustrine deposit consisting of very dense, thinly interbedded silt, silt and clay, 

and fine sand. This stratum is overlain by an approximately 50- to 60-foot-thick section of glacial 

till consisting of very dense, fine to medium sand with clayey silt and gravel. Lacustrine sediments 

similar to those underlying the glacial till overlie the glacial till with thicknesses ranging from about 
PFAS Preliminary Assessment Report

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Concord, New Hampshire

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15 to 40 feet. Outwash deposits consisting predominantly of fine sand top the overburden

stratigraphy with a thickness ranging from about 50 to 85 feet (GZA GeoEnvironmental, Inc.,

2010).

Bedrock in the vicinity consists predominantly of moderately fractured, medium-grained, two-mica

granite of the Concord Granite Formation. Additional nearby formations (Lower Rangley, Upper

Rangley, and Perry Mountain Formations) consist of metasedimentary phyllite, schist, and

quartize. The bedrock surface generally slopes downward from west to east (GZA

GeoEnvironmental, Inc., 2010).

1.5.2 Hydrogeology

Based on investigations at the adjacent Former Vishay Sprague Site, groundwater in the vicinity

is expected to be 30 and 50 feet below ground surface (bgs) and to have overburden flow to the

west/southwest toward the Merrimack River, which is located approximately 1 mile

west/southwest of the facility (GZA GeoEnvironmental, Inc., 2018). Groundwater features in the

vicinity of the facility are shown on Figure 1-2.

The overburden hydrogeology in the area generally consists of a dual hydrogeologic unit system

separated by the glacial till stratum. The upper unit consists of the saturated lacustrine and/or

outwash deposits overlying glacial till, whereas the lower unit consists of the lacustrine deposits

underlying the glacial till. Hydraulic communication between the upper and lower units is likely,

with the glacial till forming only a partial aquitard. The upper overburden unit is unconfined, with

the resultant groundwater surface at a pressure equal to atmospheric. The lower unit is partially

confined by the glacial till, with the resultant groundwater surface potentiometric (at pressure

greater than atmospheric). Groundwater elevations within the upper unit are typically observed to

be about 10 to 15 feet higher than those of the lower unit, indicating a loss in total head through

the glacial till aquitard and a vertically downward component of groundwater flow (GZA

GeoEnvironmental, Inc., 2010).

The Environmental Data Resources, Inc. (EDR) Radius Map report did not identify any public

supply wells at the AASF or within a 1-mile radius (EDR, 2019). One domestic well and one

commercial well were identified by the EDR Radius Map approximately 0.5 miles to the east of

the facility. Locations of the wells are shown on Figure 1-2.

The AASF is serviced by municipal water from the city of Concord. Third Unregulated

Contaminant Monitoring Rule (UCMR 3) data were reviewed as part of the PA. PFAS were

nondetect for the Concord Water Department treatment plant, which is located 4.3 miles northwest

of the facility on the west side of the Merrimack River (USEPA, 2017). The primary water source

for the Concord community is Penacook Lake, located 4.5 miles northwest of the facility near the

Concord Water Department treatment plant. During dry periods, the lake is supplemented with

water from Contoocook River Pump Station, which is located further northwest of Penacook Lake.

Additionally, a groundwater well field adjacent to the Soucook River in Pembroke is maintained

as an emergency water source (city of Concord, 2019c). The Pembroke well field is approximately

1.2 miles southeast of the facility, on the opposite side of the Soucook River. None of these

drinking water resources are anticipated to be hydraulically downgradient from the subject

property.

1.5.3 Hydrology

The AASF Concord is located within the central portion of the Merrimack River watershed, which

stretches from central New Hampshire into Northeastern Massachusetts. The nearest major

surface water bodies are the Merrimack River, located approximately 1 mile to the west/southwest

of the facility, and the Soucook River, located approximately 0.6 miles to the south/southeast. The
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Merrimack River is popular for recreational use, including boating, canoeing, rowing, and fishing

(NHDES, 2017). Based on the depth of the Merrimack River (5 to 40 ft or more; Concord Monitor, 

2013) and the depth to groundwater in the area (estimated to be 30 to 50 ft bgs), it is possible

that groundwater to surface water discharge may occur at points along the river downgradient of

the site. No wetlands exist within the vicinity of the facility. Surface water features in the vicinity of

the facility are shown on Figure 1-3.

Stormwater at the facility is collected from the parking lots, main apron, and landscaped areas

around the buildings and is discharged into a stormwater pre-treatment system, followed by a

three-tiered underground infiltration gallery before infiltration to groundwater. The stormwater

treatment system is located on the west side of the hangar apron. Stormwater from the roof of the

AASF building is discharged to a separate infiltration gallery located in the northeast corner of the

property (Tighe & Bond, 2018).

1.5.4 Climate

The facility lies within the humid continental climate zone, which is characterized by long, cold,

snowy winters, very warm (and at times humid) summers, and relatively brief autumns and

springs. The monthly daily average temperature ranges from a high of 31 degrees Fahrenheit (°F)

in January to 82°F in July. In winter, successive storms deliver light to moderate snowfall amounts,

contributing to the relatively reliable snow cover. Summer can bring stretches of humid conditions

as well as thunderstorms, and there is an annual average of 12 days of 90°F highs. Average

annual precipitation is approximately 41 inches (US Climate Data, 2019).

1.5.5 Current and Future Land Use

The AASF Concord property is zoned “industrial” by the city of Concord. Much of the facility is

paved with either asphalt or concrete, with unpaved grassy areas along the boundaries of the

facility. West of the main hangar, there is a hill constructed for aircraft landing practice. The AASF

is responsible for various training activities and aircraft maintenance with an active ARNG lease

until 2052. Activities and land use within the facility are not expected to change.

The area surrounding the AASF includes residential and commercial properties to the north, the

Concord Municipal Airport to the south, commercial and light industrial properties to the east, and

additional portions of the Concord Municipal Airport and the SMR to the west. Conservation/Public

Lands are located approximately 0.45 miles to the southeast, adjoining the Soucook River. No

additional mapped priority resources are located within a half-mile radius (Tighe & Bonde, 2018).

Future land use of the surrounding area is anticipated to remain the same.
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Facility Location

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AASF Concord

^_

0 0.5 1 2

Miles

Legend

Facility Boundary

10
A! AA!!

A!

A!

A! A!

A!

A!

A!

A!

A!

A!

A!

A!

!P

!P

Cemete ry Bro

Mil

ok

l Brook

Merrimack River

Frenchs Bro ok

Souc ookRiver

Former Vishay Sprague Facility

Pembroke Well Field

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Groundwater Features

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0 0.25 0.5 1

Miles

Legend

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Storm Sewer Line

Retention Basin

Inferred Groundwater

Flow Direction

Geology

Concord Granite

Perry Mountain

Formation

Upper Rangley

Formation

Lower Rangley

Formation

Wells

!P Domestic Well

!P Commercial Well

A! Monitoring Well

A! Other/Unknown Well

11
Merrimack River

Soucook River

Bow Bog

Brook-Merrimack

River Watershed

Soucook

River

Watershed

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Surface Water Features

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\NH\AASF_Concord_Figures\AASF_Concord_PA_Figures\Fig_1-3_AASF_Concord_Surface_Water.mxd

0 0.125 0.25 0.5

Miles

Legend

Facility Boundary

Water Body

Wetland

River/Stream

Storm Sewer Line

Retention Basin

Surface Water Flow

Direction

12
PFAS Preliminary Assessment Report

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Concord, New Hampshire

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2. Fire Training Areas

No FTAs were identified at the AASF Concord during the PA. Interviewees confirmed that the

facility is supported by the City of Concord Fire Department and that firefighting training has never

occurred on the property (Appendix B).
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3. Non-Fire Training Areas

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

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

Fire Suppression System Releases

As described in Section 1.4, construction on the current AASF hangar building was completed in 

2004, after which operations moved from the SMR. The AASF comprises of administrative offices, 

the AASF hangar, a wash rack, and a Fuel Truck Storage building. The hangar and the Fuel Truck 

Storage Building are currently equipped with AFFF fire suppression systems. The fire suppression 

system in the hangar, which currently includes a 900-gallon tank of Ansulite 3% AFFF, is housed 

in a room on the north side of the hangar near the loading dock. The fire suppression system in 

the Fuel Truck Storage building, which currently includes a 200-gallon tank of Ansulite 3% AFFF, 

is housed in a room in the central portion of the west side of the building. The geographic 

coordinates of the hangar are 43°12'33.50"N; 71°30'8.21”W, and the geographic coordinates of 

the Fuel Truck Storage building are 43°12'30.6"N; 71°30'04.3"W (Figure 3-1).

Both fire suppression systems (in the main hangar and the Fuel Truck Storage Building) were 

originally charged with Aer-O-Lite 3% AFFF in 2005. The system in the main hangar was tested 

once after initial installation (see Section 3.2 below). In 2008, AASF personnel discovered the 

AFFF in both fire suppression systems did not meet military specifications, and the Aer-O-Lite 3% 

AFFF was subsequently removed and replaced with Ansulite 3% AFFF. Twelve 55-gallon drums 

of Aer-O-Lite 3% AFFF were removed from the site and donated to local Fire Departments. Prior 

to disposal, the drums were stored in the hangar Hazardous Materials storage room. The system 

was not tested again after the change to Ansulite 3%. Interviewed personnel indicated that a 

contractor currently manages system inspections, and the interviewees were not familiar with the 

frequency of inspections.

Two releases of AFFF from the fire suppression systems at the AASF have occurred. The first 

release of AFFF occurred on the weekend of February 5 to 6, 2005, when the AASF was hit by 

lightning during a storm, and stray voltage triggered the fire suppression system. It was estimated 

that less than 10 gallons of Aer-O-Lite 3% AFFF were released from the AASF hangar and that 

approximately 3.4 gallons were released from the Fuel Truck Storage Building. After the release, 

the doors of the hangar and Fuel Truck Storage Building were opened, and the foam was washed 

out of the hangar and onto the apron, from where it was either washed into the drain at the center 

of the apron or onto the grass surrounding the apron. Interviewees also noted foam on the grass 

on the west side of the building, near the AASF offices. Foam washed into the drain at the center 

of the apron would drain west to an underground basin, then into an underground storm water 

treatment system, and then an underground infiltration gallery (Figure 3-1). The infiltration gallery 

is located approximately at geographic coordinates 43°12'33.1"N; 71°30'19.2"W (National Guard 

Bureau [NGB], 2002a; NGB, 2002b). 

Some foam may have also been rinsed down the trench drains in the hangar bay and wash rack. 

Foam and wastewater washed into the trench drains would have been contained and treated by 

the onsite wastewater management system. Wastewater would have drained into an onsite oilwater separator (OWS), from where the residual water would have entered a holding tank that 

fed into a membrane ultra-filtration system. After passing through the filtration system, the 

wastewater would have then been held in onsite wastewater holding tanks. The concentrate from 

the membrane filtration system, the residual from the OWS, and the wastewater in the holding 

tanks were removed by a contracted disposal facility. No foam or wastewater were discharged to 

the municipal sanitary sewer system.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

16

The second release occurred in January 2019, when a fire suppression system pipe in the AASF 

hangar wash rack froze and burst. During this release, the foam extended from the wall to about 

half the width (to the center drain) and half the length of the 8,745-square foot wash rack. The 

exact quantity of Ansulite 3% AFFF released was unknown. The foam was contained inside the 

wash bay and was rinsed down the center trench drain by AASF personnel, after which it would 

have been contained in the current AASF wastewater holding tanks, as described above.

System Testing Area

According to AASF personnel, the company that installed the fire suppression system in the 

hangar tested the system once after the initial installation to ensure proper mixing of AFFF and 

water flow and pressure. Testing was conducted outside the north side of the building by the 

loading dock, and the mixture was discharged to the grass at approximate geographic coordinates 

43°12'35.2"N; 71°30'09.9"W. At the time, the system was charged with Aer-O-Lite 3% AFFF. The 

quantity of AFFF released was unknown. The location of the system testing area is shown on 

Figure 3-1.

Fire Extinguishers

Currently, the fire extinguishers inside the AASF Concord and on the apron are ABC extinguishers 

(potassium bicarbonate). Portable ABC extinguishers are present on the apron near the helicopter 

pads and are maintained by AASF Concord. Interviewees confirmed that this type of fire 

extinguisher has been used since the facility opened in 2004.
Fire

Extinguisher

Fire Extinguisher

Infiltration

Gallery

System

Testing

Area

Fire Supression

System Releases

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12420 Milestone Center Drive

Germantown, MD 20876

Non-Fire Training Areas

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\NH\AASF_Concord_Figures\AASF_Concord_PA_Figures\Fig_3-1_AASF_Concord_Non-Fire_Training_Areas.mxd

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No Suspected Release

Facility Boundary

Storm Sewer Line

Retention Basin

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PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

18
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

19

4. Emergency Response Areas

No emergency response areas were identified within the facility during the PA through interviews

or EDR Reports. The City of Concord Fire Department would handle any potential fire or

emergency response incident at the Concord AASF.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

20
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

21

5. Adjacent Off-Facility Sources

Five potential off-facility sources of PFAS adjacent to the AASF Concord were identified during 

the PA. One of these facilities, the SMR, is under the control of the NHARNG, while the remaining 

four are not under the control of the NHARNG. Descriptions of the off-facility sources are 

presented below and are shown on Figure 5-1. Interview records are included in Appendix B.

State Military Reservation

The NHARNG SMR is located 0.5 miles east of the AASF Concord at 1 Minuteman Way, Concord, 

New Hampshire. The geographic coordinates for the SMR are 43°12'37.9"N; 71°30'46.9"W. The 

SMR is owned by the state of New Hampshire and is used for State operations of the NHARNG. 

Currently, no AFFF is stored or used on site, and the City of Concord Fire Department would 

handle any potential fire or emergency response incident. However, the former AASF Concord 

was located at the SMR, and AFFF was used and stored here between 1994 and 2004. The 

ARNG conducted a PFAS PA of the SMR under separate title and cover as part of Contract 

Number W912DR-12-D-0014, Task Order W912DR17F0192, issued 11 August 2017, and known 

releases of AFFF were identified (AECOM, 2019). Please refer to the PA Report for the SMR for 

details of those releases. Because the SMR has potential releases of PFAS and is located outside 

the boundary of the AASF Concord, it is considered a potential adjacent off-facility source of 

PFAS. Figure 5-1 shows the location of the SMR in relation to the AASF Concord. 

Concord Municipal Airport

The Concord Municipal Airport is located directly adjacent to the AASF Concord at 71 Airport 

Road, Concord, New Hampshire. The geographic coordinates for the approximate center of the 

airport property are 43o12’9.838”N; 071o30’08.228”W. The airport is a 614-acre general aviation 

facility and features two runways (Runway 17-35 and Runway 12-30). Runway 12-30 is directly 

south of the AASF, and a closed runway is directly east of the AASF. The airport has one fixed 

base operator, Concord Aviation Services, which offers aircraft services and fueling (City of 

Concord, 2019a). The airport has 35,000 square feet of heated hangars and a dozen private 

T-hangars (City of Concord, 2019b). It is not known if these hangars have fire suppression 

systems charged with AFFF. According to interviews with the NHARNG, the City of Concord Fire 

Department is responsible for responding to any potential fires or emergency response incidents 

at the Concord Municipal Airport. There is no Aircraft Rescue and Firefighting (ARFF) truck 

housed at the airport.

Municipal Airport personnel were not interviewed during the PA because the focus of the 

assessment was to evaluate potential PFAS related activities and sources at NHARNG properties, 

not formally assess adjacent sources. Therefore, it is not known if AFFF is used or stored at the 

airport currently or historically. Because the presence or absence of AFFF at the airport cannot 

be confirmed, the Concord Municipal Airport has been identified as a potential offsite PFAS source 

area. Figure 5-1 shows the location of the Concord Municipal Airport (as a potential PFAS source 

area) in relation to the AASF Concord. 

City of Concord Fire Department

The City of Concord Fire Department Heights Station is located 0.5 miles northwest of the AASF 

at 127 Loudon Road, Concord, New Hampshire. The geographic coordinates for the Heights 

Station are 43°12'52.6"N; 71°30'40.3"W. The current facility was dedicated in 1966 and is 

currently the oldest fire station in the city. The Heights Station is in the Concord Heights District 

and protects an area that encompasses the entire city east of Interstate 93 and north to the area 
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

22

of Sewalls Falls Road, including the Concord Municipal Airport. The Heights District also includes 

the Merrimack and Soucook Rivers, Interstate 93 from Exits 14 through 17, and the majority of 

Interstate 393 (City of Concord, 2019d). The City of Concord Fire Department is responsible for 

responding to any potential fires or emergency response incidents at the AASF Concord.

Concord Fire Department personnel were not interviewed during the PA; therefore, it is not known 

if AFFF is used or stored at the Heights Station currently or historically. Because the presence or 

absence of AFFF at the station cannot be confirmed, the Concord Fire Department has been 

identified as a potential offsite PFAS source area. Figure 5-1 shows the location of the Heights 

Station (as a potential PFAS source area) in relation to the AASF Concord. 

Richard M. Flynn Fire Academy 

The Richard M. Flynn Fire Academy, also known as the New Hampshire Fire Academy, is located 

1.3 miles due east of the AASF at 98 Smokey Bear Boulevard, Concord, New Hampshire. The 

geographic coordinates for the Fire Academy are 43°12'27.8"N; 71°28'39.1"W. 

The Fire Academy includes an administration/classroom building, an 80-bed dormitory, a four-bay 

fire station, and training grounds (two burn buildings, a flashover simulator, and other props). The 

Fire Academy serves as the Northeast regional training facility for aircraft rescue and firefighting 

personnel (New Hampshire Department of Safety [NHDOS], 2019). Class B foam has been used 

on the Fire Academy site through approximately 175 training courses dating back to 1994. 

According to a news interview with the NHDOS, the academy ceased using foam containing 

PFOS and PFOA in May of 2018 and instead selected a fluorine-free foam for training (Sexton, 

2018).

In June and August 2018, environmental samples were collected at the Academy at the request 

of NHDES. PFOS was detected in groundwater at concentrations ranging from 190 ppt to 

18,000 ppt and PFOA was detected at concentrations ranging from 120 ppt to 2,200 ppt, with a 

maximum total of 20,200 ppt for combined PFOA/PFOS. Elevated concentrations of PFAS 

compounds were also detected in soil samples and adjacent surface water samples from the 

Soucook River; however, there are currently no standards for PFAS in soil or surface water in 

New Hampshire (Nobis Group, 2018).

Fire Academy personnel were not interviewed during the PA; therefore, the types and quantities 

of AFFF used or stored at the academy currently or historically are not known. However, because 

the Fire Academy has confirmed releases of PFAS and is located outside the boundary of the 

AASF Concord, it is considered an adjacent off-facility source of PFAS. Figure 5-1 shows the 

location of the Richard M. Flynn Fire Academy in relation to the AASF Concord. 

Loudon Road Fire Training Area 

During interviews, NHARNG environmental office personnel indicated that an FTA was formerly 

located on Loudon Road, next to the Douglas N. Everett Arena, located 1.2 miles west of the 

AASF at 15 Loudon Road, Concord, New Hampshire. The approximate geographic coordinates 

for the former FTA are 43°12'36.1"N; 71°31'31.7"W. Interviewees indicated that there was 

previously a wooden tower at the site that was used for fire training, which was removed in the 

late 1990s.

Concord Fire Department personnel were not interviewed during the PA; therefore, it is not known 

if AFFF were used or stored at the Loudon Road FTA historically. Because the presence of AFFF 

at the FTA cannot be confirmed, it has been identified as a potential offsite PFAS source area. 
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

23

Figure 5-1 shows the location of the Loudon Road FTA (as a potential PFAS source area) in 

relation to the AASF Concord. However, because groundwater flow in the area is generally 

southwest towards the Merrimack River, this area is likely downgradient of the Concord AASF.

New Hampshire Detections 

The NHDES is engaged in an ongoing investigation of PFAS in New Hampshire drinking water 

and maintains an online, interactive PFAS Sampling Results map (NHDES, 2019). At the time of 

this PA, the database indicated that PFAS were detected at multiple locations in groundwater, 

soil, and surface water within a 4-mile radius of the AASF Concord. Data shown indicate PFAS 

were detected in groundwater in excess of the New Hampshire AGQSs in groundwater in the 

vicinity of the Richard M. Flynn Fire Academy, approximately 1.3 miles east (side-gradient), near 

the Old Suncook Road Landfill approximately 1.25 miles to the south-southwest (downgradient), 

and at an unidentified location approximately 1 mile to the east (side-gradient). PFAS were 

detected upgradient of the AASF Concord at the Former Vishay Sprague Facility; however, the 

detections were less than the AGQSs. There were no detections greater than the AGQSs within 

approximately 5 miles upgradient of the site. The source of the PFAS at these locations is not 

identified in the database. The data presented in the database are under constant revision, as 

new sites or facilities are added, and the data may not contain all potential PFAS detections.
Concord Municipal

Airport

State Military Reservation

(PA Report under separate cover)

City of Concord Fire

Department, Heights Station

Loudon Road Fire

Training Area

Richard M. Flynn

Fire Academy

FrenchsB ro ok

Merrimack River

Soucook River

Merrimack River

Souc ook River

0 750 1,500 3,000

Feet

Legend

Potential PFAS Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Storm Sewer Line

Retention Basin

Adjacent Sources

Figure 5-1

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PM RG 10/29/2019

1:18,000 ­ 12420 Milestone Center Drive

Germantown, MD 20876

Base Map: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus

DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

24
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

25

6. Preliminary Conceptual Site Model

Based on the PA findings, three AOIs were identified at the AASF Concord: AOI 1 Hangar 

Releases, AOI 2 System Testing Area, and AOI 3 Infiltration Gallery. The AOI locations are shown 

on Figure 6-1. The following sections describe the preliminary CSM components and the specific 

preliminary CSMs developed for these AOIs. The preliminary 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 Concord include site workers and construction workers. Potential off-post receptors 

include recreational users of the Merrimack River.

In general, the potential PFAS exposure pathways are ingestion and inhalation. 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 is sparse and 

continues to be the subject of PFAS toxicological study. 

AOI 1 Fire Suppression System Releases

AOI 1 includes the Fire Suppression System Releases. Both the main hangar and the Fuel Truck 

Storage Building at AASF Concord are equipped with AFFF fire suppression systems. Two 

releases have occurred since the facility was opened. In 2005, a lightning strike triggered the 

release of the suppression systems in both the main hangar and Fuel Truck Storage Building. It 

was estimated that less than 10 gallons of Aer-O-Lite 3% AFFF were released from the AASF 

hangar and that approximately 3.4 gallons were released from the Fuel Truck Storage Building. 

The foam from both buildings was washed out of the hangar onto the apron, from where it was 

either washed into the drain at the center of the apron or onto the grass surrounding the apron. 

Foam washed into the drain at the center of the apron would drain west into an underground 

infiltration gallery. 

The second release occurred in the main hangar in January 2019, when a fire suppression system 

pipe froze and burst in the wash rack. The foam extended from the wall to about half the width (to 

the center drain) and half the length of the 8,745-square foot wash rack. The system was charged 

with Ansulite 3% AFFF, but the exact quantity released is unknown. The foam was contained 

inside the wash bay and was rinsed down the center trench drain. The foam and wastewater from 

the trench drain were contained and treated by the onsite wastewater management system, as 

described in Section 3.1. Residual water was removed and disposed of by a contracted disposal 

facility.

Given the known releases from the two fire suppression systems, there is the potential for PFAS 

to have migrated from surface soil to subsurface soil around the apron. Therefore, grounddisturbing activities at AOI 1 could result in site worker and construction worker exposure to via 

ingestion of surface soil or inhalation of soil particles (dust). Ground-disturbing activities to 

subsurface soil could also result in construction worker exposure via ingestion. Therefore, the 

inhalation and ingestion pathways for these receptors are considered potentially complete for AOI 

1.

PFAS are water soluble and can migrate readily from soil to groundwater; therefore, PFAS 

released to soil at AOI 1 may migrate to the groundwater via leaching. However, due to the depth 

of groundwater at the site (estimated to be 30 to 50 ft bgs), the groundwater ingestion exposure 

pathway for construction workers is considered incomplete. Because no public drinking water 

wells were identified within 1 mile downgradient of the facility, the groundwater pathway for nearby 

residents is also considered incomplete.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

26

No surface water bodies were identified at the facility; however, the Merrimack River is located 

approximately 0.8 miles to the west/southwest (downgradient), and the Soucook River is located 

approximately 0.6 miles to the south/southeast (side gradient). It is not known if there is offsite 

groundwater discharge to surface water bodies (the Soucook River, Merrimack River, or their 

tributaries). Based on the depth to groundwater (30 to 50 ft bgs) and the depth of the Merrimack 

River (5 to 40 ft bgs), groundwater interaction with the river may be possible downgradient of the 

site. Therefore, the ingestion exposure pathway for offsite surface water and sediment is 

considered potentially complete for recreational users. Human consumption of fish potentially 

affected by PFAS from the river is also possible. The preliminary CSM for AOI 1 is shown on 

Figure 6-2.

AOI 2 System Testing Area

AOI 2 is the System Testing Area. According to AASF personnel, the fire suppression system in 

the hangar was tested once in 2005, after the initial installation, to ensure proper mixing of AFFF 

and water flow and pressure. Testing was conducted outside the north side of the building by the 

loading dock, and the mixture was discharged to the grass. The system was charged with Aer-OLite 3% AFFF, but the quantity of AFFF released is unknown.

Given the known release at the System Testing Area, there is the potential for PFAS to have 

migrated from surface soil to subsurface soil. Therefore, ground-disturbing activities at AOI 2 

could result in site worker and construction worker exposure to potential PFAS contamination via 

ingestion of surface soil or inhalation of soil particles (dust). Ground-disturbing activities to 

subsurface soil could result in construction worker exposure via ingestion. Therefore, the 

inhalation and ingestion pathways for these receptors are considered potentially complete. 

Although PFAS may migrate from the soil to the groundwater via leaching, the groundwater 

ingestion exposure pathway for construction workers is considered incomplete due to the depth 

to groundwater (30 to 50 ft bgs). Because no public drinking water wells were identified within 1 

mile downgradient of the facility, the groundwater ingestion pathway for nearby residents is also 

considered incomplete.

As described above in Section 6.1, no surface water bodies were identified at the facility. 

However, it is not known whether there is offsite groundwater discharge to downgradient surface 

water bodies (the Soucook River, Merrimack River, or their tributaries). Based on the depth to 

groundwater (30 to 50 ft bgs) and the depth of the Merrimack River (5 to 40 ft bgs), groundwater 

interaction with the river may be possible downgradient of the site. Therefore, the ingestion 

exposure pathway for offsite surface water and sediment is considered potentially complete for 

recreational users of the nearby rivers. Human consumption of fish potentially affected by PFAS 

from the river is also possible. The preliminary CSM for AOI 2 is shown on Figure 6-2.

AOI 3 Infiltration Gallery

AOI 3 is the Infiltration Gallery. The stormwater system and infiltration gallery were installed circa 

2004, when the new AASF was constructed. Stormwater runoff from the main apron is collected 

in a drain at the center of the apron and discharged into a stormwater pre-treatment system, 

followed by a three-tiered underground infiltration gallery. According to engineering drawings, the 

infiltration gallery is located 4 feet bgs (NGB, 2002c). According to interviews with NHARNG 

personnel, foam from the 2005 fire suppression system releases in the main hangar and the fuel 

truck storage building was washed into the drain.

Given the known releases of AFFF to the stormwater system, there is potential for PFAS to have 

migrated from the infiltration gallery directly to subsurface soil. Therefore, ground-disturbing 

activities at AOI 3 could result in site worker and construction worker exposure to potential PFAS 
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

27

contamination via inhalation of soil particles (dust). Ground-disturbing activities to subsurface soil

could result in construction worker exposure via ingestion. Therefore, the inhalation and ingestion

pathways for these receptors are considered potentially complete. Although PFAS may migrate

from the soil to the groundwater via leaching, the groundwater ingestion exposure pathway for

construction workers is considered incomplete due to the depth to groundwater (30 to 50 ft bgs).

Because no public drinking water wells were identified within 1 mile downgradient of the facility,

the groundwater ingestion pathway for nearby residents is also considered incomplete.

As described above in Section 6.1, no surface water bodies were identified at the facility.

However, it is not known whether there is offsite groundwater discharge to downgradient surface

water bodies (the Soucook River, Merrimack River, or their tributaries). Based on the depth to

groundwater (30 to 50 ft bgs) and the depth of the Merrimack River 5 to 40 ft bgs), groundwater

interaction with the river may be possible downgradient of the site. Therefore, the ingestion

exposure pathway for offsite surface water and sediment is considered potentially complete for

recreational users of the nearby rivers. Human consumption of fish potentially affected by PFAS

from the river is also possible. The preliminary CSM for AOI 3 is shown on Figure 6-3.
A!! A! A

A!

A!

A!

A!

A!

A!

A!

A!

A!

A!

A!

A!

!P

!P

Infiltration

Gallery

System

Testing Area

Fire Supression

System Releases

Concord Municipal

Airport

State Military Reservation 

(PA Report under separate cover)

City of Concord Fire

Department, Heights Station

Loudon Road Fire

Training Area

Richard M. Flynn

Fire Academy

Fire Extinguisher

Fire Extinguisher

FrenchsB ro ok

Merrimack River

Soucook River

Merrimack River

Souc ook River

Bow Bog

Brook-Merrimack

River Watershed

Soucook River

Watershed

AOI 1 AOI 2

AOI 3

0 750 1,500 3,000

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Storm Sewer Line

Retention Basin

Surface Water Flow Direction

Inferred Groundwater Flow Direction

Area of Interest

Figure 6-1

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1:18,000 ­ 12420 Milestone Center Drive

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Base Map: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus

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Media

SOURCE PATHWAY RECEPTOR

AOI 1 

AOI 2

Hangar Fire 

Suppression 

System Releases; 

System Testing

PFAS in 

Surface 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

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-Chart Continues

Partial / Possible Flow

Flow-Chart Stops

Incomplete Pathway

Potentially Complete Pathway

Complete Pathway

Site Worker Construction Worker Resident Trespasser/ Recreational User

Site Worker Construction Worker Resident Trespasser/ Recreational User LEGEND

Figure 6-2

Preliminary Conceptual Site Model

AOI 1 Fire Suppression System Releases and 

AOI 2 System Testing Area

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

/

/ /

/ /

/ /

/

/

/

/

/

/

/ /

/

/

/

/ /

NOTES

1. The resident receptor refers to an offsite resident. 

2. No surface water bodies were 

identified at the facility, but the surface 

water/sediment pathway is considered 

potentially complete for offsite 

recreational users due to the potential 

for groundwater interaction with the 

downgradient river.

3. Human consumption of fish 

potentially affected by PFAS from the 

downgradient river is possible.

29
Media

SOURCE PATHWAY RECEPTOR

AOI 3

Releases from 

Infiltration Gallery

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

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-Chart Continues

Partial / Possible Flow

Flow-Chart Stops

Incomplete Pathway

Potentially Complete Pathway

Complete Pathway

Site Worker Construction Worker Resident Trespasser/ Recreational User

Site Worker Construction Worker Resident Trespasser/ Recreational User LEGEND

Figure 6-3

Preliminary Conceptual Site Model

AOI 3 Infiltration Gallery

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

/

/ /

/ /

/

/

/

/

/

/

/ / /

/ /

/

/

/ /

NOTES

1. The resident receptor refers to an offsite resident. 

2. No surface water bodies were 

identified at the facility, but the surface 

water/sediment pathway is considered 

potentially complete for offsite 

recreational users due to the potential 

for groundwater interaction with the 

downgradient river.

3. Human consumption of fish 

potentially affected by PFAS from the 

downgradient river is possible.

30
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

31

7. Conclusions

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

storage, and potential release of AFFF and other PFAS-related activities at the AASF Concord. 

The PA findings are based on the information presented in Appendix A and Appendix B.

Findings

Three AOIs related to PFAS releases were identified (Table 7-1) at the AASF Concord during the 

PA (Figure 7-1).

Table 7-1: AOIs at AASF Concord

Area of

Interest Name Used by PotentialRelease Dates

AOI 1 Fire Suppression System Releases NHARNG 2005 - 2019

AOI 2 System Testing Area NHARNG 2005

AOI 3 Infiltration Gallery NHARNG 2005

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

PFAS contamination in media at or near the facility. The preliminary CSMs for AOI 1 and AOI 2 

are shown on Figure 6-2, and the preliminary CSM for AOI 3 is shown on Figure 6-3. The 

preliminary CSMs present the potential receptors and media impacted. 

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

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

Table 7-2: No Suspected Release Areas

No Suspected

Release Area Used by Rationale for No SuspectedRelease Determination

Fire Extinguishers NHARNG Fire extinguishers inside the AASF Concord and on the

apron are ABC extinguishers (potassium bicarbonate).

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 AASF Concord. 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 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 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, and 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.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

32

Table 7-3: Uncertainties

Area of Interest Source of Uncertainty

AOI 1

Fire Suppression

System Releases

According to interviewees, the foam from the 2005 event was washed out of the

hangar onto the apron, from where it was either washed into the drain at the center

of the apron or onto the grass to the south of the apron. The quantity of AFFF

which was washed onto the grass is unknown.

Additionally, interviewees indicated that foam from the 2019 hangar release was

contained inside the wash rack; however, it is possible that some foam was

released to the environment. The exact quantity of AFFF released in 2019 is

unknown.

AOI 2

System Testing

Area

The system testing was undocumented; therefore, the exact quantity of AFFF used

is unknown. Additionally, the exact location of the system testing is estimated

based on interviewee knowledge.

AOI 3

Infiltration Gallery

According to interviewees, the foam from the 2005 event was washed out of the

hangar onto the apron, from where it was either washed into the drain at the center

of the apron or onto the grass to the south of the apron. The quantity of AFFF

which traveled to the infiltration gallery is unknown.

Potential Future Action

Interviews and records (covering 2005 to present) indicate that current or former ARNG activities 

may have resulted in potential PFAS releases at the three AOIs identified during the PA. Based 

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

PFAS contamination in surface and subsurface soil at these AOIs. In addition, there is potential 

for offsite receptors to be exposed to PFAS contamination in surface water and sediment or via 

fish consumption. Table 7-4 summarizes the rationale used to determine if the AOIs should be 

considered for further investigation under the CERCLA process and undergo a SI. 

The ARNG evaluates the need for an SI based on the presence of a PFAS release, possible 

receptors, and the migration potential of PFAS contamination to receptors.

Table 7-4: PA Findings Summary

Area of

Interest

AOI

Location Rationale

Potential

Future Action

AOI 1

Fire

Suppression

System

Releases

43°12'31.0"N;

71°30'07.8"W

Known release in 2005 from the main hangar

and the Fuel Truck Storage Building Hangar.

Foam was washed into the drain at the center

of the apron and onto the grass to the south of

the apron. Known release in 2019 within Wash

Rack. Foam was contained inside the building.

Proceed to an SI,

focus on surface

soil, subsurface

soil, and

groundwater

AOI 2

System

Testing Area

43°12'35.2"N;

71°30'09.9"W

Fire Suppression System from the main hangar

was tested and discharged to this location in

2005.

Proceed to an SI,

focus on surface

soil, subsurface

soil, and

groundwater

AOI 3

Infiltration

Gallery

43°12'33.1"N;

71°30'19.2"W

Foam washed into the drain at the center of the

apron after 2005 fire suppression system

releases would travel to the underground

infiltration gallery. Potential for AFFF to be

released to the subsurface from the infiltration

gallery.

Proceed to an SI,

focus on

subsurface soil

and groundwater
Infiltration Gallery

System Testing Area

Fire Supression

System Releases

Concord Municipal

Airport

State Military Reservation 

(PA Report under separate cover)

City of Concord Fire

Department, Heights Station

Loudon Road Fire

Training Area

Richard M. Flynn

Fire Academy

Fire Extinguisher

Fire Extinguisher

AOI 1

AOI 2

AOI 3

FrenchsB ro ok

Merrimack River

Soucook River

Merrimack River

Souc ook River

0 750 1,500 3,000

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Storm Sewer Line

Retention Basin

Summary of Findings

Figure 7-1

CLIENT

REVISED

SCALE

10/29/2019 MS

AM

10/29/2019

10/29/2019

ARNG

GIS BY

CHK BY

TITLE

PROJECT Preliminary Assessment for PFAS at AASF Concord, NH

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\NH\AASF_Concord_Figures\AASF_Concord_PA_Figures\Fig_7-1_AASF_Concord_Summary.mxd

PM RG 10/29/2019

1:18,000 ­ 12420 Milestone Center Drive

Germantown, MD 20876

Base Map: Source: Esri, DigitalGlobe, GeoEye, Earthstar Geographics, CNES/Airbus

DS, USDA, USGS, AeroGRID, IGN, and the GIS User Community

33
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

34
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

35

8. References

AECOM, 2019. Draft Preliminary Assessment Report, State Military Reservation, Concord, New

Hampshire, Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA)

Impacted Sites, ARNG Installations, Nationwide. May.

City of Concord, 2019a. Concord Municipal Airport, Airport Figures. Accessed May 6 2019 at

https://www.concordnh.gov/344/Concord-Municipal-Airport.

City of Concord, 2019b. Facilities, Concord Municipal Airport. Accessed May 6 2019 at

http://www.concordnh.gov/facilities/facility/details/concordmunicipalairport-31

City of Concord, 2019c. General Services (Public Works), Water, Water Source. Accessed 23

May 2019 at: https://www.concordnh.gov/1396/Water-Source.

City of Concord, 2019d. Heights Station. Accessed May 6 2019 at https://concordnh.gov/1108/

Heights-Station.

Concord Monitor, 2013. Editorial: River must be approached with caution. Accessed 15 October

2019 at https://www.concordmonitor.com/Archive/2013/07/EditRIVER-cmview-070913. 10

July.

EDR, 2019. The EDR Radius MapTM Report with GeoCheck®; Aerial Photo Decade Package; 

and Certified Sanborn® Map Report; Army Aviation Support Facility Concord, 26 Regional 

Drive, Concord, NH, 03301. May.

GZA GeoEnvironmental, Inc., 2010. Remedial Action Plan, Former Vishay Sprague Facility, 70

Pembroke Road, Concord, New Hampshire. February.

GZA GeoEnvironmental, Inc., 2018. Annual Summary Report – Monitoring Year 2017, Former

Vishay Sprague Facility, 70 Pembroke Road, Concord, New Hampshire.

New Hampshire Code of Administrative Rules, Chapter Env-Dw 700, Water Quality: Standards,

Monitoring, Treatment, Compliance, and Reporting; Env-Dw 701.03, Env-Dw 705.06, EnvDw 707.06, Env-Dw 712.23 through Env-Dw 712.30. Effective 30 September 2019.

NGB, 2002a. Site Plan - Airside. Sheet No: C-11. Army Aviation Support Facility, Project No.

97828-R/330028, Army – New Hampshire National Guard, Concord Airport, Concord, New

Hampshire. 25 October.

NGB, 2002b. Grading and Drainage Plan - Airside. Sheet No: C-14. Army Aviation Support

Facility, Project No. 97828-R/330028, Army – New Hampshire National Guard, Concord

Airport, Concord, New Hampshire. 25 October.

NGB, 2002c. Drainage System Details #1. Sheet No: C-16. Army Aviation Support Facility, Project

No. 97828-R/330028, Army – New Hampshire National Guard, Concord Airport, Concord,

New Hampshire. 25 October.

NHDES, 2017. The Upper Merrimack River. Water Division, Rivers Management Protection

Program. Accessed 15 October 2019 at

https://www.des.nh.gov/organization/divisions/water/wmb/rivers/merri_river_upper.htm.

 NHDES, 2019. NHDES PFAS Sample Map. Accessed May 15 2019 at

http://nhdes.maps.arcgis.com/apps/View/index.html?appid=66770bef141c43a98a445c54a

17720e2&extent=-73.5743,42.5413,-69.6852,45.4489.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

36

NHDOS, 2019. Division of Fire Standards and Training and Emergency Medical Services. Our

Mission. Accessed May 3, 2019 at https://www.nh.gov/safety/divisions/fstems/.

Nobis Group, 2018. Focused Site Investigation Work Plan, New Hampshire Department of Safety,

Richard M. Flynn Fire Academy, 98 Smokey Bear Boulevard, Concord, New Hampshire,

NHDES Site No. 201710012. November 9.

Sexton, Adam, 2018. PFAS detected at New Hampshire Fire Academy. New Hampshire News

Channel WMUR9. Accessed May 3 2019 at: https://www.wmur.com/article/baby-sea-lionrescued-from-busy-california-highway-1556904231/27357461. October 31.

Tighe & Bond, 2018. Building Addition Preconstruction Assessment, New Hampshire Army

National Guard, Army Aviation Support Facility, 26 Regional Drive Concord, New

Hampshire. September.

United States Census Bureau, 2018. QuickFacts: Concord city, New Hampshire; United States.

Accessed May 2 2019 at https://www.usclimatedata.com/climate/concord/newhampshire/united-states/usnh0045.

US Climate Data, 2019. Climate Concord - New Hampshire. Accessed April 9 2019 at

https://www.usclimatedata.com/climate/concord/new-hampshire/united-states/usnh0045.

USAEHA, 1993. Preliminary Assessment, Ground Water Quality Survey No. 38-26-K28T-94,

Selected NHARNG Sites. 12 November.

USEPA, 1980. Comprehensive Environmental Response, Compensation, and Liability Act

(CERCLA).

USEPA, 1991. Guidance for Performing Preliminary Assessments under CERCLA. September.

USEPA, 1994. National Oil and Hazardous Substances Pollution Contingency Plan (Final Rule).

40 CFR Part 300; 59 Federal Register 47384. September.

USEPA, 2016a. Drinking Water Health Advisory for Perfluorooctanoic Acid (PFOA). Office of

Water (4304T). Health and Ecological Criteria Division, Washington, DC 20460. EPA

Document Number: 822-R-16-005. May.

USEPA, 2016b. Drinking Water Health Advisory for Perfluorooctane Sulfonate (PFOS). Office of

Water (4304T). Health and Ecological Criteria Division, Washington, DC 20460. EPA

Document Number: 822-R-16-004. May.

USEPA, 2017. UCMR 3 (2013-2015) Occurrence Data by State. Occurrence Data for the

Unregulated Contaminant Monitoring Rule. Accessed 9 July 2019 at

https://www.epa.gov/dwucmr/occurrence-data-unregulated-contaminant-monitoring-rule.

January.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Data Resources
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Data resources will be provided separately on CD. Data resources for the AASF Concord

include:

Environmental Data Resources Report

· 2019 The EDR Radius MapTM Report with GeoCheck®; Aerial Photo Decade Package; and

Certified Sanborn® Map Report; Army Aviation Support Facility Concord, 26 Regional

Drive, Concord, NH 03301.

Previous Investigations

· GZA GeoEnvironmental, Inc., 2010. Remedial Action Plan, Former Vishay Sprague Facility,

70 Pembroke Road, Concord, New Hampshire. February.

· Hengen, Elizabeth Durfee, 2011. Historic Area Form, Concord Municipal Airport, Concord,

New Hampshire. February.

· Stone & Webster Environmental Technology & Services, 1998. Final Site Investigation, New

Hampshire Army National Guard, State Military Reservation, Concord, New Hampshire.

March.

· Tighe & Bond, 2018. Building Addition Preconstruction Assessment, New Hampshire Army

National Guard, Army Aviation Support Facility, 26 Regional Drive Concord, New

Hampshire. September.

Real Estate Documentation

· City of Concord, New Hampshire, 2002. Lease Agreement by and between the City of

Concord and the State of New Hampshire, by and through the Adjutant General, for a

certain 26 acre tract or parcel of land located in the City of Concord, County of Merrimack

and State of New Hampshire at Concord Municipal Airport. 29 May.

Regulations, Advisories, and Orders

· NHDES, 2019. New Hampshire Code of Administrative rules, Chapter Env-Dw 700, Water

Quality: Standards, Monitoring, Treatment, Compliance, and Reporting; NH Env-Dw 701.03,

NH Env-Dw 705.06, NH Env-Dw 707.06, NH Env-Dw 712.23 through NH Env-Dw 712.30.

30 September.

Engineering Drawings

· NHARNG, 2013. AASF – First Floor Plan. Sheet 1 of 2. November.

· NHARNG, 2013. AASF – First Floor Plan. Sheet 2 of 2. November.

· NGB, 2002a. Site Plan - Airside. Sheet No: C-11. Army Aviation Support Facility, Project No.

97828-R/330028, Army – New Hampshire National Guard, Concord Airport, Concord, New

Hampshire. 25 October.

· NGB, 2002b. Grading and Drainage Plan - Airside. Sheet No: C-14. Army Aviation Support

Facility, Project No. 97828-R/330028, Army – New Hampshire National Guard, Concord

Airport, Concord, New Hampshire. 25 October.

· NGB, 2002c. Drainage System Details #1. Sheet No: C-16. Army Aviation Support Facility,

Project No. 97828-R/330028, Army – New Hampshire National Guard, Concord Airport,

Concord, New Hampshire. 25 October.
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Appendix B.1

Interview Records








PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Appendix B.2

Visual Site Inspection Checklists




PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Appendix B.3

Conceptual Site Model Information




PFAS Preliminary Assessment Report

AASF Concord

Concord, New Hampshire

Photograph Log
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA)

Impacted Sites ARNG Installations, Nationwide

Photograph No. 01

Description:

View of apron from main

hanger at AASF from bay

doorl note floor/trench

drain along doorway.

Orientation:

Southeast

Date 4/22/2019

Time 14:11

Photograph No. 02

Description:

Floor/trench drain along

center of main AASF

Hanger.

Orientation:

Northeast

Date 4/22/2019

Time 14:12

AECO Page 1 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 03

Description:

AFFF tank (900 gallons) 

and piping for the Hanger 

fire suppression system in 

the tank/pump room.

Orientation:

Southeast

Date 4/22/2019

Time 14:19

Photograph No. 04

Description:

Label details for the AFFF 

tank for the Hanger fire 

suppression system in the 

tank/pump room. This label 

appears to have been 

removed from a 55-gallon 

AFFF drum and placed on 

the 900-gallon AFFF tank.

Orientation:

NA

Date 4/22/2019

Time 14:19

AECO Page 2 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 05

Description:

Label details for the 900-

gallon AFFF tank for the 

Hanger fire suppression 

system in the tank/pump 

room.

Orientation:

NA

Date 4/22/2019

Time 14:23

Photograph No. 06

Description:

Label details for the 900-

gallon AFFF tank for the 

Hanger fire suppression 

system in the tank/pump 

room.

Orientation:

NA

Date 4/22/2019

Time 14:23

AECO Page 3 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 07

Description:

AFFF tank (200 gallons) 

and piping for the Fuel 

Truck Storage Building fire 

suppression system in the 

tank/pump room.

Orientation:

Southeast

Date 4/22/2019

Time 14:37

Photograph No. 08

Description:

Label details for the 200-

gallon AFFF tank for the 

Fuel Truck Storage 

Building fire suppression 

system in the tank/pump 

room.

Orientation:

NA

Date 4/22/2019

Time 14:37

AECO Page 4 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 09

Description:

Label details for the 200-

gallon AFFF tank for the 

Fuel Truck Storage 

Building fire suppression 

system in the tank/pump 

room.

Orientation:

NA

Date 4/22/2019

Time 14:37

Photograph No. 10

Description:

Label details for the 200-

gallon AFFF tank for the 

Fuel Truck Storage 

Building fire suppression 

system in the tank/pump 

room.

Orientation:

NA

Date 4/22/2019

Time 14:37

AECO Page 5 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 11

Description:

Label details for the 200-

gallon AFFF tank for the 

Fuel Truck Storage 

Building fire suppression 

system in the tank/pump 

room. This label appears 

to have been removed 

from a 55-gallon AFFF 

drum and placed on the 

900-gallon AFFF tank.

Orientation:

NA

Date 4/22/2019

Time 14:37

Photograph No. 12

Description:

Drain in center of AASF 

apron, which flows west to 

a underground basin, 

Vortex oil-water seperator, 

and then an on-site 

infiltration gallery.

Orientation:

Southeast

Date 4/22/2019

Time 14:45

AECO Page 6 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 13

Description:

Access point to the 

underground basin west of 

the AASF Apron, into 

which the drain at the 

center of the apron flows. 

Maholes for the 

Vortechnics oil-water 

separator and area of 

infiltration gallery can be 

seen in the background.

Orientation:

Northwest

Date 4/22/2019

Time 14:47

Photograph No. 14

Description:

View of infiltration gallery 

area looking West.

Orientation:

West

Date 4/22/2019

Time 14:47

AECO Page 7 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 15

Description:

Manhole covers for 

Vortechnics oil-water 

separator.

Orientation:

North

Date 4/22/2019

Time 14:48

Photograph No. 16

Description:

Close-up of manhole 

covers for Vortechnics oilwater separator.

Orientation:

South

Date 4/22/2019

Time 14:48

AECO Page 8 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 17

Description:

Pipes in wash rack of main 

AASF Hanger which froze 

and burst in January 2019, 

resulting in a foam release 

(Ansulite 3% AFFF).

Orientation:

North

Date 4/22/2019

Time 15:32

Photograph No. 18

Description:

Area of Wash Rack in 

main AASF Hanger which 

had a foam release 

(Ansulite 3% AFFF) in 

January 2019. Pipes 

(shown on back wall) froze 

and burst, resulting in a 

foam release. The foam 

was approximately chesthigh and extended from 

the back wall to about half 

the width (to the center 

drain) and half the length 

of the wash rack.

Orientation:

North

Date 4/22/2019

Time 15:33

AECO Page 9 of 10
Appendix C - Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS

AASF Concord Concord, New Hampshire

Preliminary Assessment Report

AASF Concord

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic Acid (PFOA) 

Impacted Sites ARNG Installations, Nationwide

Photograph No. 19

Description:

Fire extinguisher (#1) on 

AASF apron near Fuel 

Tank Storage Building, 

chemical.

Orientation:

NA

Date 4/22/2019

Time 15:33

Photograph No. 20

Description:

Fire extinguisher (#2) on 

AASF apron near Fuel 

Tank Storage Building, 

chemical.

Orientation:

NA

Date 4/22/2019

Time 15:33

AECO Page 10 of 10