FINAL

Preliminary Assessment Report

1108th Theatre Aviation Sustainment 

Maintenance Group (TASMG), 

Gulfport, Mississippi

Perfluorooctanesulfonic Acid (PFOS) and Perfluorooctanoic Acid 

(PFOA) Impacted Sites

ARNG Installations, Nationwide

September 2020

Prepared for:

Army National Guard Bureau

111 S. George Mason Drive

Arlington, VA 22204

UNCLASSIFIED
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

i

Table of Contents

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

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

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

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

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

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

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

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

1.5.2 Hydrogeology ....................................................................................... 7

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

1.5.4 Climate ................................................................................................. 8

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

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

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

3.1 Release Area A – New Paint Hangar ............................................................ 13

3.2 Release Area B – Main Hangar and Tank Room .......................................... 13

3.3 Release Area D & E – Old Aircraft Staging Ramp ........................................ 14

4. Emergency Response Areas ................................................................................. 16

5. Adjacent Sources .................................................................................................. 17

5.1 Release Area C – MSANG Aircraft Parking Ramp ....................................... 17

5.2 MSANG Building 75 (Aircraft Hangar) .......................................................... 17

5.3 MSANG Building W-1 (Former Warehouse) ................................................. 17

5.4 MSANG Building 77 (Former Fire Station) ................................................... 17

5.5 MSANG Building 66 (Current Fire Station) ................................................... 18

5.6 Gulfport-Biloxi International Airport ............................................................... 18

5.7 Gulfport South Waste Water Treatment Plant ............................................... 18

5.8 Former MSARNG Facility ............................................................................. 18

5.9 MSANG FTAs ............................................................................................... 18

6. Preliminary Conceptual Site Model ....................................................................... 21

6.1 AOI 1 Release Area A................................................................................... 21

6.2 AOI 2 Release Area B .................................................................................. 22

6.3 AOI 3 Release Area C .................................................................................. 22

6.4 AOI 4 Release Areas D & E .......................................................................... 23

7. Conclusions ........................................................................................................... 28

7.1 Findings ........................................................................................................ 28

7.2 Uncertainties ................................................................................................ 28

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

8. References ............................................................................................................ 32
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

ii

Figures

Figure ES-1 Summary of Findings

Figure ES-2 Preliminary Conceptual Site Model

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

Figure 6-3 Preliminary Conceptual Site Model AOI 2

Figure 6-4 Preliminary Conceptual Site Model AOI 3 & AOI 4

Figure 7-1 Summary of Findings

Tables

Table ES-1 AOIs at 1108th TASMG

Table 7-1 AOIs at 1108th TASMG

Table 7-2 Sources of Uncertainty

Table 7-3 PA Findings Summary

Appendices

Appendix A Data Resources

Appendix B Preliminary Assessment Documentation

B.1 Interview Records

B.2 Visual Site Inspection Checklists

B.3 Conceptual Site Model Information

Appendix C Photographic Log
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

iii

Acronyms and Abbreviations

% percent

°F degrees Fahrenheit

AECOM AECOM Technical Services, Inc.

AFFF aqueous film forming foam

ARFF Aircraft Rescue and Firefighting

amsl above mean sea level

ANG Air National Guard

AOI area of interest

ARNG Army National Guard

bgs below ground surface

CERCLA Comprehensive Environmental Response, Compensation, and Liability Act

CRTC Combat Readiness Training Center

CSM conceptual site model

EDR Environmental Data Resrouces, Inc.

FTA fire training area

Jet-X Ansul Jet-X 2 3/4 % High-Expansion Foam Concentrate

MSARNG Mississippi Army National Guard

OWS oil-water separator

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

SI Site inspection

TASMG Theatre Aviation Sustainment Maintenance Group

US United States

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

VSI visual site inspection

WWTP waste water treatment plant
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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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) G9, 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) (a suite of related

chemicals), primarily in the form of aqueous film forming foam (AFFF) released during firefighting

activities or training, although other PFAS sources are possible.

AECOM completed a PA for PFAS at 1108th Theatre Aviation Sustainment Maintenance Group

(TASMG) in Gulfport, Mississippi, to assess potential PFAS release areas and exposure pathways

to receptors. The property at 1108th TASMG is under State of Mississippi Military Department

control until June of 2066, as leased from the Gulfport-Biloxi Regional Airport Authority.

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 13 March 2019

· Interviewed current 1108th TASMG personnel during the site visit including Mississippi ARNG

(MSARNG) environmental manager, the facility Fire Chief, the Aviation Safety Officer and

facilities maintenance personnel

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

documented with photographs

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

pathway of PFAS for the areas of interest (AOIs) and the facility

Four AOIs related to a potential PFAS releases were identified at 1108th TASMG during the PA.

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

Table ES-1 AOIs at 1108th TASMG

Area of Interest Name Used by Potential Release

Dates

AOI 1 Release Area A MSARNG October 2018

AOI 2 Release Area B MSARNG 2018

AOI 3 Release Area C MSANG 1990s

AOI 4 Release Area D & E MSARNG 1980s - 2016

Based on the potential PFAS releases at AOI 1, AOI 2, AOI 3, and AOI 4, there is potential for

exposure to PFAS contamination in surface soil to site workers, construction workers, and

visitors/trespassers; in surface water/sediment to off-facility residents; in subsurface soil to 

construction workers; and in shallow groundwater to construction workers and residents. The

CSM for 1108th TASMG is shown on Figure ES-2.

Mississippi Air National Guard (MSANG) is investigating AOI 3 as a part of their May 2016 PA

report and January 2019 SI report (Leidos, 2019). As such, future actions at AOI 3 under the

CERCLA process are anticipated to be performed by the MSANG, not the MSARNG.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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Based on the USEPA Unregulated Contaminant Monitoring Rule 3 data, it was indicated that no

PFAS were detected in a public water system above the USEPA Health Advisory level within 20

miles of the facility.
MSANG Building 66

(Current Fire Station)

MSANG Building 77

(Former Fire Station)

MSANG Building W-1

(Former Warehouse)

MSANG Building 75

(Aircraft Hangar)

MSANG Aircraft

Parking Ramp

Release Area A

Release Area B

Release Area D

Former MSARNG

Facility

MSANG FTA

Gulfport-Biloxi

International Airport

Gulfport South Waste

Water Treatment Plant

Release Area E

Release Area C

Main Hangar

Turkey Creek

AOI 1

AOI 3

AOI 2

AOI 4

0 550 1,100 2,200

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Pipeline

CLIENT

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ARNG

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MS

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7/9/2020

7/9/2020

Preliminary Assessment for PFAS at TASMG Gulfport, MS

7/9/2020

1:13,200 ­ Figure ES-1 PM RG 7/9/2020

12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

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

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

PROJECT

3
Media

SOURCE PATHWAY RECEPTOR

AOI 1, 2, 3 &

4

Releases of Jet-X

& AFFF

Potential

PFAS in

subsurface

soil, surface

soil, & on

parking ramp

Human

Activities

Precipitation/

Run-Off

Leaching/

Infiltration

Airborne Soil

Particulate

Surface Soil

Surface

Water/

Sediment

Shallow

Groundwater

Subsurface

Soil

Source Release

Mechanism Media Transportand Migration Media ExposureRoutes

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 Visitor/Trespasser

Site

Worker

Construction

Worker Resident Visitor/

Trespasser

/ /

LEGEND

/

Figure ES-2

Preliminary Conceptual Site Model

TASMG Gulfport

Potential

Off-Facility

Sources Not

under

Control of

ARNG

/

/

/

/ /

/

/ / /

/

/ /

/ /

/ / /

Notes:

1. The resident and recreator receptors

refer to an off-site receptor.

2. Dermal contact exposure pathway is

incomplete for PFAS.

4
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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1. Introduction

1.1 Authority and Purpose

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

Army National Guard (ARNG) G9, Cleanup Branch contracted AECOM Technical Services, Inc.

(AECOM) to perform Preliminary Assessments (PAs) and Site Inspections (SIs) for

Perfluorooctanesulfonic acid (PFOS) and Perfluorooctanoic acid (PFOA) Impacted Sites at ARNG

Facilities Nationwide under Contract Number W912DR-12-D-0014, Task Order

W912DR17F0192, issued 11 August 2017. The ARNG is assessing potential effects on human

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

(PFAS), primarily releases of aqueous film forming foam (AFFF) although other sources of PFAS

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 these PFAS

compounds in the environment will vary. The regulatory framework at both federal and state levels

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

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

national standards regulating PFAS in drinking water.

This report presents findings of a PA for PFAS at 1108th Theatre Aviation Sustainment

Maintenance Group (TASMG), Gulfport, Mississippi, in accordance with the Comprehensive

Environmental Response, Compensation, and Liability Act (CERCLA), as amended, the National

Oil and Hazardous Substances Pollution Contingency Plan (40 Code of Federal Regulations Part

300), and USACE requirements and guidance.

This PA documents the known or suspected areas where PFAS may have been released into the

environment at 1108th TASMG. The term PFAS will be used throughout this report to encompass

all PFAS being evaluated, including PFOS and PFOA, which are key components of AFFF.

1.2 Preliminary Assessment Methods

The performance of this PA included the following tasks:

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

· Conducted a site visit on 13 March 2019

· Interviewed current 1108th TASMG personnel during the site visit including Mississippi Army

National Guard (MSARNG) environmental manager, the facility Fire Chief, the Aviation Safety

Officer, and facilities maintenance personnel

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

documented with photographs

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

pathway of PFAS for the areas of interest (AOIs) and the facility
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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1.3 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.

· 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 at each AOI.

· 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

1.4 Facility Location and Description

The 1108th TASMG (also referred to as the “facility”) is located within the City of Gulfport, Harrison

County, on the coast of Mississippi (Figure 1-1). Located on Gulfport-Biloxi International Airport

property, the TASMG facility is co-located with the Air National Guard (ANG) Combat Readiness

Training Center (CRTC). The 1108th TASMG and the CRTC are tenants under lease from

Gulfport-Biloxi Regional Airport Authority until June of 2066. At present, 1108th TASMG includes

approximately 33-acres of land and operates as a full Army aviation maintenance depot facility.

The MSARNG has been occupying the present location since 1989. Prior to that, the MSARNG

occupied a small hangar facility on the south end of the taxiway. These buildings are located

outside of the current boundaries of ANG and ARNG property.

1.5 Facility Environmental Setting

The 1108th TASMG is located within the Gulf Coastal Plain, less than 3 miles from coast of

Mississippi. The Coastal Plain is a gently sloping area of unconsolidated fluvial and deltaic

sediments. Elevations at the facility range from approximately 22 to 26 feet above mean sea level

(amsl). The facility is located within the Turkey Creek Watershed, and drainage generally flows to

the north towards Turkey Creek (MSARNG, 2017).
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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1.5.1 Geology

The facility is located above the unconsolidated sediments of the Gulf Coast Plain and falls entirely

within the Prairie Formation, a late Pleistocene alluvial deposit. The deposits on the Gulf Coast

are defined by the late Pleistocene Sangamonian Interglacial, during which, sea levels rose and

encroached on coastal areas.

At the beginning of this coastal transgression, sea level stood at a much lower elevation than it

does today. Deposition of muddy and sandy marine and estuarine sediments of the Biloxi

Formation occurred during the sea level rise. Gulfport Formation barrier island progradation

coincided with a coalescing of Prairie Formation floodplains, which created an interfingering of

the two units. The sea level eventually exceeded modern levels before falling again about 125 to

122 thousand years ago. During this time, barrier strandplains built out seaward from the edge of

the Prairie Coastal Plain. Below the Sangamonian sediments lie undifferentiated alluvium and

Neogene fluvial siliclastic sediments (Otvos, 2001).

1.5.2 Hydrogeology

Two major aquifers, the Mississippi embayment and the coastal lowlands aquifer, occur in

Mississippi. The coastal lowlands aquifer is present in the southern third of the state, which

includes the 1108th TASMG. In southern Mississippi the coastal lowlands aquifer system is more

than 5,000 feet thick and is composed of several individual aquifers and confining units. The base

of the coastal lowlands aquifer system is a thick sequence of marine clays of the Jackson and

Vicksburg Groups, which outcrop across the middle of Mississippi. The facility is located to the

south of a principle regional recharge area, and just to the east of a principle regional discharge

area which is related to the flow of the Mississippi River (Grubbs, 1986).

The individual aquifers that make up the coastal lowlands include the Catahoula, Hattisburg,

Pascagoula, Graham Ferry, and Citronelle. They consist of thick, lenticular beds of sand or gravel

that are generally not continuous over large areas. The Graham Ferry and the Pascagoula

aquifers both underlay the facility and are used for domestic, industrial, and public water supply

in the area. Both of these aquifers include confining clay layers and contain well fields operated

by the City of Gulfport for water supply to the facility and surrounding areas (BB&E, 2016).

The water table aquifer underlying the facility is the Pamlico aquifer. Formerly, the aquifer was

used locally for irrigation and limited water supply; however, it has become contaminated with

sewage and other contaminants from various sources in the general Gulfport area, making it

unsuitable for drinking water. During a 2019 SI at the adjacent ANG CRTC facility, groundwater

levels were measured at depths of 1.95 feet below ground surface (bgs) to 6.25 feet bgs. The

groundwater flow direction is generally north-northwest towards, Bayou Bernard, as shown on

Figure 1-2 (Leidos, 2019).

Drinking water for 1108th TASMG is drawn from a municipal supply. The Environmental Data

Resources, Inc. (EDR) report (Appendix A) lists two City of Gulfport wells approximately 1,400

feet east-southeast of the southern part of the facility. There are multiple domestic drinking water

wells listed within 1 mile to the north of the facility boundary. These wells are generally drilled at

depths of 170 to 220 feet bgs (Appendix A).

Based on the USEPA Unregulated Contaminant Monitoring Rule 3 data, it was indicated that no

PFAS were detected in a public water system above the USEPA Health Advisory level within 20

miles of the facility.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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1.5.3 Hydrology

The 1108th TASMG lies within the Bernard Bayou-Big Lake Watershed (Figure 1-3). The facility

has a very low topographic gradient, with elevations ranging from approximately 22 – 26 feet

amsl. Two drainage ditches direct surface water and stormwater off-site to the north. There is a

pond in the northeast corner of the facility that is potentially used for stormwater and does not

appear to be a permanent feature.

The primary drainage in the area is Bayou Bernard, about 0.5 miles to the north. The bayou drains

east to Big Lake and eventually to the Mississippi Sound and the Gulf of Mexico. The Brickyard

Bayou flows towards the east about 1 mile south of the facility and joins with Bayou Bernard

before entering into Big Lake.

1.5.4 Climate

The Gulfport, Mississippi climate is humid and subtropical. The annual mean temperature is 68.25

degrees Fahrenheit (°F). The average summer temperature is 90.5°F. The summer months (June,

July, and August) have the highest rainfall, with an average of 6.87 inches of precipitation per

month. The average winter temperature is 62.7°F. The mean annual precipitation is 65.19 inches

of rain (US Climate Data, 2019).

1.5.5 Current and Future Land Use

At present, the 1108th TASMG has a total land area of approximately 33 acres. The primary

mission of the facility is to provide aircraft maintenance, component rebuilding, and painting. The

facility buildings provide space for the main operations and storage. Land use surrounding the

facility is a mixture of residential and industrial and includes the co-located ANG CRTC and

Gulfport-Biloxi International Airport.

The 1108th TASMG is located within the City of Gulfport, Mississippi, which is the second largest

city in the state. Reasonably anticipated future land use is not expected to change from the current

land use.
Mississippi 

Sound

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

LC

9/17/2019

9/17/2019

Preliminary Assessment for PFAS at TASMG Gulfport, MS

1:126,720

9/17/2019 ­ Figure 1-1 PM RG 9/17/2019

12420 Milestone Center Drive

Germantown, MD 20876

Facility Location

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

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

^_

TASMG Gulfport

PROJECT

0 1 2 4

Miles

Legend

Facility Boundary

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PM RG 7/9/2020

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Base Map: Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c)
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

12

2. Fire Training Areas

No FTAs were identified at the 1108th TASMG during the PA. According to the facility Fire

Marshall, the adjacent Mississippi ANG (MSANG) Station covers emergency response to the

1108th TASMG. The MSANG operates an FTA at an off-facility location that is discussed further

in Section 5.
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1108th TASMG, Mississippi

13

3. Non-Fire Training Areas

Non-FTAs where PFAS were potentially released were also identified during the PA. A description

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

records appear in Appendix B and photographs in Appendix C.

3.1 Release Area A – New Paint Hangar

The New Paint Hangar is located on the northern half of the facility. Construction of the building

began in 2017 and was completed in September 2018. Release Area A is shown on Figure 3-1.

The New Paint Hangar includes a fire suppression system that is charged with Ansul Jet-X 2 3/4

percent (%) High-Expansion Foam Concentrate (Jet-X). The Jet-X data sheet provided by Ansul

(Appendix A) does not explicitly state the absence of PFAS in the product. Therefore, there is

the potential for Jet-X to contain PFAS. During the VSI, a 400-gallon Jet-X tank that supplies the

New Paint Hangar suppression system was observed in a utility room within the Hangar.

Corrosion was noted on the exterior of the tank, as well as on the floor of the utility room. No floor

drains were noted within the utility room.

According to multiple interviews with site personnel, in October 2018, a full test of the New Paint

Hangar suppression system was conducted using Jet-X. The hangar doors were shut, and the

walls were covered in plastic in order to prevent foam from exiting the hangar. During the test, the

tank was completely expended, and it was reported that the foam reached heights of 4-6 feet

within the hangar. After the test, the foam was cleaned with mops and guided into hangar floor

drains. These drains lead to an oil-water separator (OWS) located behind the hangar that drains

to the city sanitary sewer, and ultimately to the city of Gulfport Waste Water Treatment Plant

(WWTP) located just north of the facility boundary (Figure 3-1). Sludge that collects inside the

OWS is vacuumed out and sent to a Subtitle D landfill.

3.2 Release Area B – Main Hangar and Tank Room

The Main Hangar is located on the northern half of the facility, southeast of the New Paint Hangar.

Release Area B is shown on Figure 3-1. According to interviews with the facility Aviation Safety

Officer (Appendix B), the Main Hangar was constructed in 1989. The building currently serves

as the facility’s main aircraft maintenance hangar.

The Main Hangar includes a 5 to 10-year-old fire suppression system that is equipped with a 900-

gallon Chemguard AFFF tank. During the VSI, an additional 55-gallon drum of Chemguard AFFF

was also noted in the tank room, which is adjacent to the southwest wall of the Main Hangar and

houses the suppression system tank. AFFF residue was noted on the floor of the tank room. Floor

drains were present in this room; however, they were located on an elevated section of floor about

3 feet above the base of the tank, and any minor leaks of AFFF would not reach the drains.

According to site personnel, the bladder in the AFFF tank was replaced within the past year. It is

unknown whether the AFFF in the tank was replaced at this time. Site personnel did not have

knowledge of any documentation related to the bladder change, and there are uncertainties

regarding how the AFFF was managed during this process. Staining on the floor of the tank room

and on the side of the tank itself indicates potential spills or leaks have occurred inside the tank

room. According to interviews, there have been no instances of AFFF release inside the Main

Hangar during the duration of the suppression system’s existence, and a test of the suppression

system has never been conducted.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

14

3.3 Release Area D & E – Old Aircraft Staging Ramp

The Old Aircraft Staging Ramp includes two paved areas located adjacent to the Main Hangar on

its southwest side. Release Areas D & E are shown on Figure 3-1. The ramp was used for aircraft

staging until about 2016. At the time of the PA site visit, the northern part of the Old Aircraft Staging

Ramp (Release Area D) was being used as a staging area for active construction. A new hangar

was being built adjacent to the Main Hangar, which is the second stage of the project that

completed the New Paint Hangar in 2018.

According to information obtained during interviews, Tri-MaxTM units containing AFFF were

historically staged here; however, the Aviation Safety Officer stated that no discharges of AFFF

have occurred from 1991 – present. Personnel were historically trained by discussion and

instructional videos, but not by actually discharging the units. It is unknown how the maintenance

of the Tri-MaxTM units was handled. Training and maintenance activities prior to 1991 are also

unknown. At the time of the site visit, only standard dry chemical extinguishers were present at

the 1108th TASMG installation.
Main Hangar

Release Area A

Release Area B

Release Area D

Release Area E

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PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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4. Emergency Response Areas

No instances of emergency response firefighting were identified at the 1108th TASMG during the

PA. The adjacent MSANG fire department would provide emergency response to the facility, if

needed. The current Aviation Safety Officer and Fire Marshall reported no knowledge of

emergency responses going back to 1991.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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5. Adjacent Sources

Nine potential off-facility sources of PFAS not under control of the MSARNG were identified during

the PA. All these sources are detailed in a 2019 MSANG Gulfport CRTC SI Report for PFAS

(Leidos, 2019). A description of each potential off-facility source is presented below, and locations

are shown on Figure 5-1.

5.1 Release Area C – MSANG Aircraft Parking Ramp

The MSANG Aircraft Parking Ramp is located along the southeast boundary of the facility,

upgradient from the majority of the remaining 1108th TASMG land. Ownership of the northeast

trending segment of the ramp is split between the MSANG and the MSARNG. Routine nozzle

testing using AFFF was conducted on the ramp during the 1990s by CRTC personnel. Nozzle

testing was known to have occurred on the 1108th TASMG property portion of the ramp (Release

Area C) (Leidos, 2019). In addition, line purging of Aircraft Rescue and Firefighting (ARFF)

vehicles that carried AFFF was performed on the Aircraft Parking Ramp in the area of MSANG

Building 77 (Former Fire Station) and Building W-1 (Former Warehouse), as discussed below.

Foam expended on the MSANG Aircraft Parking Ramp by CRTC personnel would have been left

to dissipate or drain into the trench drain in the middle of the ramp. This trench drain leads to a

detention pond and an outfall off-site to the northeast of the 1108th TASMG facility boundary.

MSANG performed an SI at CRTC in 2019; PFAS were detected in soil, sediment, surface water,

and groundwater samples associated with the Aircraft Parking Ramp release area (Leidos, 2019).

There were exceedances of the USEPA Lifetime Health Advisory for PFOS and PFOA

documented in the 2019 SI.

5.2 MSANG Building 75 (Aircraft Hangar)

The MSANG Building 75 (Aircraft Hangar) is located to the south and approximately 80 feet

upgradient of the 1108th TASMG facility boundary. An AFFF suppression system was installed in

the hangar in 2002. The suppression system consists of a 1,200-gallon AFFF tank and additional

AFFF storage containers. A release of AFFF was reported to likely have occurred during testing

of the system after installation. Additionally, a 2009 aircraft crash into the hangar triggered an

AFFF release of unknown quantity. Lastly, a small release of AFFF was reported during pipeline

maintenance in 2013 (Leidos, 2019).

PFAS were detected in the soil and groundwater samples from the Building 75 (Aircraft Hangar)

release area during the 2019 SI (Leidos, 2019).

5.3 MSANG Building W-1 (Former Warehouse)

The MSANG Building W-1 (Former Warehouse) is located approximately 1,000 feet upgradient

of the 1108th TASMG facility boundary, to the south. It was built in 1957 and surplus AFFF was

likely stored at the building before it was demolished in 2007 (Leidos, 2019).

PFAS were detected in the co-located soil and groundwater samples collected by the MSANG to

evaluate the Building W-1 (Former Warehouse) and the Building 77 (Former Fire Station) release

areas during the SI (Leidos, 2019).

5.4 MSANG Building 77 (Former Fire Station)

MSANG Building 77 was built in 1957 and operated as the CRTC Fire Station until it was

demolished in 2008, and it is located upgradient and approximately 820 feet south of the 1108th
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

18

TASMG facility boundary. During its operation, Building 77 stored AFFF on trucks and in drums.

The 2019 SI reported that on one occasion, a drum of AFFF ruptured outside of the building. No

other known releases of AFFF occurred at Building 77 (Leidos, 2019).

PFAS were detected in the co-located soil and groundwater samples collected by the MSANG to

evaluate the Building W-1 (Former Warehouse) and the Building 77 (Former Fire Station) release

areas during the SI (Leidos, 2019).

5.5 MSANG Building 66 (Current Fire Station)

MSANG Building 66 was built in 2008 to replace Building 77 as the Fire Station, and it is located

south and approximately 0.25-mile upgradient of the 1108th TASMG facility boundary. Historically

and presently, multiple firetrucks hold AFFF at the station, in addition to three 500-gallon AFFF

tanks that supply a gravity-fed refill system for the trucks. AFFF drips slowly into secondary

containment from these tanks. Vehicles that hold AFFF are washed in the parking bays or outside

on the west side of the building (Leidos, 2019).

PFAS were detected in the soil and groundwater samples collected by the MSANG to evaluate

the Building 66 (Current Fire Station) release area during the SI (Leidos, 2019).

5.6 Gulfport-Biloxi International Airport

The 1108th TASMG is located along the northeast corner of the Gulfport-Biloxi International

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

assessment was to evaluate potential PFAS related activities and sources at MSARNG

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 of AFFF at the airport cannot

be confirmed, Gulfport-Biloxi International Airport has been identified as a potential off-site PFAS

source area.

5.7 Gulfport South Waste Water Treatment Plant

The Gulfport South WWTP is located immediately to the north of the facility. Potential PFAS

containing waste water from the New Paint Hangar fire suppression system test was discharged

to the WWTP via the sanitary sewer. WWTPs can be secondary sources of PFAS depending on

the areas that they serve. WWTP biosolids have specifically been found to be secondary sources

of PFAS contamination. Because WWTP personnel were not interviewed during the VSI, it is

unknown where and how the biosolids from the WWTP are treated or disposed of. It is known that

the WWTP discharges effluent, which is potentially PFAS containing, to local streams. As such,

the WWTP could be a potential adjacent source of PFAS.

5.8 Former MSARNG Facility

The former location of the MSARNG facility was in operation from 1974 to the mid-1990s and

consisted of multiple hangars off the south end of the taxiway. No information was obtained during

the PA regarding the potential use, storage, or management of AFFF at this facility.

5.9 MSANG FTAs

The former MSANG FTA (used from 1972 – 1988) is located approximately 0.8-miles to the west

of the 1108th TASMG. During the MSANG SI, all six PFAS compounds tested for were detected

in groundwater (Leidos, 2019). The USEPA Lifetime Health Advisory level of 70 nanograms per
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1108th TASMG, Mississippi

19

liter (ng/l) was exceeded for PFOA and PFOS. The current MSANG FTA (in use since 1999) is

located immediately to the north of the former MSANG FTA. Five PFAS compounds tested for

were detected in groundwater, although there were no exceedances of the USEPA Lifetime Health

Advisory.
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PFAS Preliminary Assessment Report

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6. Preliminary Conceptual Site Model

Based on the PA findings, four AOIs were identified at 1108th TASMG: AOI 1 Release Area A, AOI

2 Release Area B, AOI 3 Release Area C, and AOI 4 Release Area D & E. The AOI locations are

shown on Figure 6-1. The following section describes the CSM components and the specific

preliminary CSM developed for this AOI. 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.

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. Receptors for the 1108th TASMG include

site workers, construction workers, off-facility residents, recreational users, and trespassers. The

CSMs for the AOI indicates which specific receptors could potentially be exposed to PFAS.

6.1 AOI 1 Release Area A

AOI 1 encompasses Release Area A (Figure 6-1). A large release of Jet-X by the MSARNG inside

the hangar occurred in 2018 during a full test of the fire suppression system. No remediation

activities have occurred at AOI 1.

It was reported that the Jet-X foam did not escape the confines of the hangar and was drained

through the floor drains to the OWS, and subsequently to the city of Gulfport WWTP, located just

north of the facility boundary, via the city sanitary sewer system. Given the uncertainty of the

chemical composition of Jet-X, PFAS may have infiltrated to the subsurface via leaks in drains,

the OWS, underground wastewater conveyance piping beneath the hangar, or along such piping

from the facility to the municipal WWTP. Under such scenarios ground disturbing activities in these

areas could result in construction worker exposure to PFAS via inhalation of dust or ingestion of

exposed subsurface soil. Construction activities also have the potential to intersect the shallow

water table. Therefore, the soil and groundwater PFAS contamination exposure pathways for

construction workers are potentially complete.

Potential PFAS contamination may have further infiltrated to shallow groundwater, which is

anticipated to flow north-northwest. It is possible that PFAS could have migrated to water wells

identified within 1 mile of the facility boundaries. Reported well depths range from approximately

20 to 800 feet bgs. Wells located immediately downgradient of the facility are classified as

municipal, irrigation, or other/unknown based on information in the EDR report (Appendix A).

Given the presence of wells with domestic uses downgradient of AOI 1, the groundwater pathway

to off-facility residents is potentially complete. Industrial, municipal supply, irrigation, and more

domestic wells are located within two miles downgradient of the facility, but on the opposite side

of the bayou, which likely acts as a hydraulic barrier. There are City of Gulfport municipal supply

wells identified to the east of the southern part of the facility. These wells are located hydraulically

upgradient from the facility; therefore, the exposure pathway is incomplete for them.

The Gulfport WWTP discharges effluent to local streams. Therefore, the PFAS contamination

exposure pathways for surface water and sediment to off-facility residents are potentially

complete. The preliminary CSM for AOI 1 is shown on Figure 6-2.
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1108th TASMG, Mississippi

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6.2 AOI 2 Release Area B

AOI 2 encompasses Release Area B (Figure 6-1). Due to uncertainties regarding the

management of AFFF during a bladder change of the AFFF tank during 2018, PFAS may have

been released into the environment. No remediation activities have occurred at AOI 2.

During the PA site visit, staining and corrosion were noted on the exterior of the AFFF tank and

the floor of the tank room which feeds to the Main Hangar AFFF suppression system, which

indicate potential PFAS release during the fall 2018 bladder change. There are multiple

uncertainties regarding the bladder change process. It is unknown who conducted the bladder

change, how the AFFF was managed during the change, and whether any AFFF were spilled or

otherwise discharged during the process. Due to these uncertainties and the visual evidence of

AFFF released inside the tank room, there is the potential that PFAS have been released to the

environment.

AFFF released outside of the tank room would have contacted concrete and/or surface soil and

infiltrated in the area immediately surrounding the tank room. Ground disturbing activities to

surface soil could result in facility worker, construction worker, and visitor/trespasser exposure to

potential PFAS contamination via ingestion and inhalation of airborne particulates. Ground

disturbing activities to subsurface soil could result in construction worker exposure to potential

PFAS contamination via ingestion and inhalation of airborne particulates, and ingestion of

contaminated shallow groundwater. Therefore, these pathways are potentially complete. Multiple

municipal wells are located downgradient of 1108th TASMG, therefore, the PFAS exposure

pathway for groundwater to off-facility residents is potentially complete. There are no surface

water features in this area; therefore, the surface water and sediment pathways for PFAS are

incomplete for all receptors. The preliminary CSM for AOI 2 is shown on Figure 6-3.

6.3 AOI 3 Release Area C

AOI 3 encompasses Release Area C which is a part of the MSANG Parking Ramp discussed in

Section 5.1 (Figure 6-1). The northern portion of the ramp is divided between the MSANG and

the MSARNG by a trench drain that runs northeast to southwest down the middle of the ramp. In

the 1990s, nozzle testing with AFFF was conducted by MSANG personnel and is known to have

occurred on both sides of the Aircraft Parking Ramp (Leidos, 2019). No remediation activities

have occurred at AOI 3 to date.

The AFFF released on the Aircraft Parking Ramp would have been left to dissipate or enter the

trench drains on the ramp. Some AFFF may have directly contacted surface soil adjacent to the

ramp. The northeast to southwest-trending drain leads to a detention pond and Outfall 003, an

off-facility outfall to the northeast. During the 2019 MSANG PFAS SI, PFAS were detected in soil,

groundwater, sediment, and surface water samples collected at Outfall 003. AFFF also has the

ability to mobilize through potential cracks and seams in the Aircraft Parking Ramp and into the

soil or shallow groundwater.

Ground-disturbing activities to surface soil at AOI 3 may result in facility worker, construction

worker, and visitor/trespasser exposure to potential PFAS contamination via ingestion or

inhalation of airborne particulates. Ground-disturbing activities to subsurface soil could result in

construction worker exposure to potential PFAS contamination via ingestion of soil, ingestion of

shallow groundwater, or inhalation of airborne particulates. Given the detections of PFAS in the

surface water and sediment at the off-facility outfall, the exposure pathways for these media to

off-facility residents are potentially complete. The preliminary CSM for AOI 3 is shown on Figure

6-4.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

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6.4 AOI 4 Release Areas D & E

AOI 4 encompasses Release Areas D and E (Figure 6-1). Tri-MaxTM units were historically staged

in this area. Given a lack of information prior to 1991 and uncertainty regarding the maintenance

of these units, there is the potential for PFAS to have been released into the environment. No

remediation activities have occurred at AOI 4.

Potential releases of AFFF on the Old Aircraft Staging Ramp (Release Areas D & E) would have

directly contacted the concrete, soil, or entered the surface water drainage ditch located

immediately to the north of the area. Due to their proximity to each other, the potential migration

and exposure pathways to receptors at AOI 4 are the same as those discussed in Section 6.3 for

AOI 3. The preliminary CSM for AOI 4 is shown on Figure 6-4.
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Area of Interest

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

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

PROJECT

24
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Airborne Soil 

Particulate

Surface Soil 

Shallow 

Groundwater

Surface 

Water/

Sediment

Subsurface 

Soil

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

Ingestion

Ingestion

Ingestion

Hum

C

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

Site 

Worker

Cons

W

Site 

Worker

Cons

W

LEGEND

Figure 

Preliminary Concep

AOI 1 – Relea

Potential 

Off-Facility 

Sources Not 

under 

Control of 

ARNG

/ 

/ 

/

/ /

Ingestion

Notes:1. The resident and recreator receptorsrefer to an off-site receptor.2. Dermal contact exposure pathway isincomplete for PFAS.
Media

SOURCE PATHWAY RE

AOI 2

Potential Spill or 

Discharge of 

AFFF during 

bladder 

replacement

Potential 

PFAS on 

concrete/

asphalt and 

surface soil

Human 

Activities

Leaching/

Infiltration

Precipitation/ 

Run-Off

Airborne Soil 

Particulate

Surface Soil 

Shallow 

Groundwater

Surface 

Water/

Sediment

Subsurface 

Soil

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

Ingestion

Ingestion

Ingestion

Hum

C

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

Site 

Worker

Cons

W

Site 

Worker

Cons

W

LEGEND

Figure 

Preliminary Concep

AOI 2 – Relea

Potential 

Off-Facility 

Sources Not 

under 

Control of 

ARNG

/ 

/ /

Ingestion / 

/ 

Notes:1. The resident and recreator receptorsrefer to an off-site receptor.2. Dermal contact exposure pathway isincomplete for PFAS.
Media

SOURCE PATHWAY RE

AOI 3 & 4 MSANG Nozzle Testing Potential PFAS on ramps and 

surface soil

Human 

Activities

Leaching/Infiltration

Precipitation/ 

Run-Off

Airborne Soil 

Particulate

Surface Soil 

Shallow 

Groundwater

Surface 

Water/

Sediment

Subsurface 

Soil

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

IngestionIngestion

Ingestion

Ingestion

Hum

C

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

Site 

Worker

Cons

W

Site 

Worker

Cons

W

LEGEND

Figure 

Preliminary Concep

AOIs 3 & 4 – Release 

Potential 

Off-Facility 

Sources Not 

under 

Control of 

ARNG

/ 

/ 

/ 

/ 

/ 

Notes:1. The resident and recreator receptorsrefer to an off-site receptor.2. Dermal contact exposure pathway isincomplete for PFAS.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

28

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 1108th TASMG. The PA findings are based

on the information presented in Appendix A and Appendix B.

7.1 Findings

Four AOIs related to potential PFAS releases were identified at 1108th TASMG during the PA

(Figure 7-1) and are described in Table 7-1 below.

Table 7-1 AOIs at 1108th TASMG

Area of Interest Name Used By Release Dates

AOI 1 Release Area A MSARNG 2018

AOI 2 Release Area B MSARNG 2018

AOI 3 Release Area C MSANG 1990s

AOI 4 Release Area D & E MSARNG 1980s - 2016

Based on the potential PFAS releases at AOI 1, AOI 2, AOI 3, and AOI 4, there is potential for

exposure to PFAS contamination in surface soil to site workers, construction workers, and

visitors/trespassers; in surface water/sediment to off-facility residents; in subsurface soil to 

construction workers; and in shallow groundwater to construction workers and residents.

Multiple potential off-facility sources of PFAS were noted as being present in the local area

surrounding 1108th TASMG. These areas include: the Gulfport-Biloxi International Airport,

Gulfport South WWTP, the former MSARNG occupied facility, and the adjacent MSANG CRTC

(Aircraft Parking Ramp – overlaps MSARNG property and AOI 2, Building 75 [Aircraft Hangar],

Building W-1 [Former Warehouse], Building 77 [Former Fire Station], and Building 66 [Current

Fire Station]). Details regarding these areas are provided in Section 5.

The MSANG CRTC is located upgradient from the 1108th TASMG. MSANG conducted an SI for

PFAS at the CRTC in 2019, and PFAS were detected in soil, sediment, surface water, and

groundwater samples collected during the assessment (Leidos, 2019).

7.2 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, or other non-traditional activities, or on its disposition.

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, and personal accounts from interviews did not extend back farther than

1991. Gathered information has a degree of uncertainty due to the absence of written

documentation, the limited number of personnel with direct knowledge due to staffing changes,

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

recollection. Inaccuracies may arise in potential PFAS release locations, dates of release, volume
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

29

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, potential source areas were visually inspected, and

documents regarding potential adjacent sources were reviewed.

Table 7-2 summarizes the uncertainties associated with the PA:

Table 7-2 Sources of Uncertainty

Area of Interest Source of Uncertainty

General Interview information obtained during the

PA only extended back to 1991. The facility

has been operating in its current location

since 1989.

AOI 1 Release Area A It is unknown whether Jet-X contains

PFAS.

AOI 1 Release Area A It is unknown whether pipes and conduits

from the New Paint Hangar to the WWTP

have leaked in the subsurface.

AOI 3 Release Area C It is unknown whether AFFF has leached

from the concrete parking ramp into

subsurface soil and/or groundwater.

AOI 3 Release Area C The amount and concentration of AFFF

released at AOI 2 throughout the 1990s is

unknown.

Main Hangar Tank Room No information regarding the AFFF tank

bladder change process was available.

Former MSARNG Facility It is unknown whether AFFF was stored,

managed, or used at this former location.

AOI 4 Release Areas D & E The potential management and use of TriMax units from 1989 - 1991 is unknown. No

information was available regarding the

maintenance of Tri-MaxTM units that were

historically staged on the ramp after 1991.

7.3 Potential Future Actions

Interviews and records (covering 1991 to present) indicate that current or former ARNG activities

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

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

in soil, groundwater, surface water, and sediment at these AOIs. 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.

ARNG will evaluate the need for an SI at AOI 1, AOI 2, and AOI 4 at 1108th TASMG based on the

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

availability of resources. MSANG is investigating AOI 3 as a part of their May 2016 PA report and
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

30

January 2019 SI report (Leidos, 2019). As such, future actions at AOI 3 under the CERCLA

process are anticipated to be performed by the MSANG, not the MSARNG.

Table 7-3 PA Findings Summary

Area of Interest Rationale Potential Future Action

AOI 1 Release Area A

In 2018 a full test of the

suppression system was

conducted using Jet-X foam,

which may contain PFAS.

Proceed to an SI, focus on

soil and groundwater.

AOI 2 Release Area B

The bladder change in the

AFFF tank may have resulted in

AFFF releases to the

environment.

Proceed to an SI, focus on

soil and groundwater.

AOI 3 Release Area C

In the 1990s, MSANG

performed nozzle testing with

AFFF along the ramp.

Proceed to the next step in

the CERCLA process under

the MSANG program.

AOI 4 Release Areas D & E

Interview records do not cover

the entire timeline of Tri-MaxTM

presence, and there is

uncertainty regarding the

maintenance procedures.

Proceed to an SI, focus on

soil, groundwater, surface

water, and sediment.
MSANG Building 66

(Current Fire Station)

MSANG Building 77

(Former Fire Station)

MSANG Building W-1

(Former Warehouse)

MSANG Building 75

(Aircraft Hangar)

MSANG Aircraft

Parking Ramp

Release Area A

Release Area B

Release Area D

Former MSARNG

Facility

MSANG FTA

Gulfport-Biloxi

International Airport

Gulfport South Waste

Water Treatment Plant

Release Area E

Release Area C

Main Hangar

Turkey Creek

AOI 1

AOI 3

AOI 2

AOI 4

0 550 1,100 2,200

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Pipeline

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

PD

7/9/2020

7/9/2020

Preliminary Assessment for PFAS at TASMG Gulfport, MS

7/9/2020

1:13,200 ­ Figure 7-1 PM RG 7/9/2020

12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

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

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

PROJECT

31
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

32

8. References

BB&E. 2016. Final Perfluorinated Compounds Preliminary Assessment Site Visit Report

Mississippi Air National Guard Combat Readiness Training Center Gulfport, Mississipi and C-17

Assault Strip Adjacent to Camp Shelby Hattiesburg, Mississippi. May.

Grubb, Hayes F. 1986. Gulf Coast Regional Aquifer-System Analysis--A Mississippi Perspective.

US Geological Survey Water-Resources Investigations Report 86-4 162.

Leidos. 2019. Final Site Inspection Report for Perfluorooctane Sulfonate and Perfluorooctanoic

Acid at Gulfport Regional Airport, Mississippi. January.

MSARNG 2017. Gulfport TASMG, Final Storm Water Pollution Prevention Plan, Volume 2.

Otvos, Ervin G. 2001. H. Mississippi Coast: Stratigraphic and Quaternary Evolution in the

Northern Gulf Coastal Plain Framework. US Geological Survey Open-file Report 01-415-H.

United States Climate Data. 2018. Available at https://www.usclimatedata.com/climate/desmoines/iowa/united-states/usia0231 (Accessed August 23, 2018).

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

Preliminary Assessments under CERCLA. September.
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

Appendix A

Data Resources
PFAS Preliminary Assessment Report

1108th TASMG – Gulfport, Mississippi

Data Resources will be provided separately on CD. Data Resources for 1108th TASMG include:

Adjacent MSANG PFAS Investigations

• 2016 Final Perfluorinated Compounds Preliminary Assessment Site Visit Report Mississippi

Air National Guard Combat Readiness Training Center Gulfport, Mississippi and C-17

Assault Strip Adjacent to Camp Shelby Hattiesburg, Mississippi

• 2019 Site Inspection Report for Perfluorooctane Sulfonate and Perfluorooctanoic Acid at

Gulfport Regional Airport, Mississippi

Previous Investigations or Reports Completed at 1108th TASMG and Surrounding Area

• 2017 Gulfport TASMG, Final Storm Water Pollution Prevention Plan, Volume 2

• 1986 Gulf Coast Regional Aquifer System Analysis-A Mississippi Perspective

1108th TASMG EDRTM Report

• 2019 1108th TASMG Environmental Data Resources, Inc.TM Report

Other Facility Information

• Ansul Jet-X 2% Foam Concentrate Data Sheet

• Facility Lease Information 
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

Appendix B

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

Appendix B.1

Interview Records










PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

Appendix B.2

Visual Site Inspection Checklists








PFAS Preliminary Assessment Report

1108th TASMG, Mississippi

Appendix B.3

Conceptual Site Model Information
Preliminary Assessment – Conceptual Site Model Information

Site Name: TASMG Gulfport

Why has this location been identified as a site?

Foam suppression systems in hangars.

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

Adjacent ANG facility. Read SI – ANG may have sprayed foam onto ARNG property.

Training Events

Have any training events with AFFF occurred at this site? No

If so, how often? N/A

How much material was used? Is it documented? N/A

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? Most surface drainage enters stormwater system or sewer system/oil-water 

separator.

Average rainfall? 65.19 inches

Any flooding during rainy season? Yes

Direct or indirect pathway to ditches? Yes, stormwater system has outfalls

Direct or indirect pathway to larger bodies of water? Unknown

Does surface water pond any place on site? Yes, one pond on east side.

Any impoundment areas or retention ponds? No

Any NPDES location points near the site? Unknown

How does surface water drain on and around the flight line? Stormwater system
Preliminary Assessment – Conceptual Site Model Information

Groundwater:

Groundwater flow direction? North to northwest (as identified in ANG SI report)

Depth to groundwater? 1 – 5 feet

Uses (agricultural, drinking water, irrigation)? No

Any groundwater treatment systems? No

Any groundwater monitoring well locations near the site? Yes

Is groundwater used for drinking water? Not on base

Are there drinking water supply wells on installation? No

Do they serve off-post populations? N/A

Are there off-post drinking water wells downgradient? Unknown, potentially private wells

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?

No

3. Other? 

Release (for testing purposes) of Paint Hangar foam fire suppression system in 2018. Went into drains, 

then oil-water separator, then city sewer.
Preliminary Assessment – Conceptual Site Model Information

Identify Potential Receptors:

Site Worker Unlikely

Construction Worker Unlikely

Recreational User Unlikely

Residential Unlikely

Child Unlikely

Ecological Possible, depending on where city sewer discharges to.

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

Foam would have discharged to the city sewer, so groundwater and soil in the area would not

have been impacted.

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

1108th TASMG, Mississippi

Appendix C

Photographic Log
PreliminaryAssessment Report

AECOM

1108th TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites 

ARNG Installations, Nationwide

APPENDIX C – Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS 1108th TASMG Gulfport, Mississippi

Description:

55-gallon drum of AFFF staged 

in the Main Hangar Fire 

Suppression System utility 

room.

Data taken: 13 March 2019

Photograph No. 1

Description:

Label on Main Hangar Fire 

Suppression System tank.

Data taken: 13 March 2019

Photograph No. 2
AECOM

Preliminary Assessment Report 

1108th TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites 

ARNG Installations, Nationwide

APPENDIX C – Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS 1108th TASMG Gulfport, Mississippi

Description:

Hose for Fire Suppression 

System in Main Hangar.

Data taken: 13 March 2019

Photograph No. 3

Description:

400-gallon tank of Ansul 

Jet-X foam which charges 

the Paint Hangar Fire 

Suppression System.

Data taken: 13 March 2019

Photograph No. 4
AECOM

Preliminary Assessment Report 

1108th TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites 

ARNG Installations, Nationwide

APPENDIX C – Photographic Log

Army National Guard, Preliminary 

Assessment for PFAS 1108th TASMG Gulfport, Mississippi

Description:

Label on Paint Hangar Fire 

Suppression System tank.

Data taken: 13 March 2019

Photograph No. 5

Description:

Dry chemical extinguishers on 

the flight line outside the Main 

Hangar.

Data taken: 13 March 2019

Photograph No. 6