FINAL 

Preliminary Assessment Report

Army Aviation Support Facility #3

Meridian, 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

Meridian AASF #3

Meridian, Mississippi 

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Table of Contents

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

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

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

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

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

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

1.5 Facility Environmental Setting ....................................................................................5

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

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

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

1.1.1 Climate ............................................................................................................7

1.5.4 Current and Future Land Use..........................................................................7

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

2.1 No Suspected Release Area A – North Apron .......................................................... 11

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

3.1 Release Area A – AFFF System Tank.......................................................................13

3.2 Release Area B – Tri-MaxTM Carts............................................................................13

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

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

5.1 Meridian Wastewater Treatment Plant (WWTP).......................................................16

5.2 Key Field Airport .......................................................................................................16

5.3 Key Field ANG Base AFFF Releases.......................................................................16

5.4 Potential ANG FTA ...................................................................................................18

6. Preliminary Conceptual Site Model....................................................................................20

6.1 AOI 1 Release Area A – AFFF System Tank ............................................................20

6.2 AOI 2 Release Area B – Tri-MaxTM Carts .................................................................20

7. Conclusions .......................................................................................................................23

7.1 Findings....................................................................................................................23

7.2 Uncertainties ............................................................................................................23

7.3 Potential Future Actions ...........................................................................................24

8. References ........................................................................................................................26
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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Tables

Table ES-1 AOIs at AASF #3

Table 5-1 Potential PFAS Sources at Key Field ANG Base

Table 7-1 AOIs at AASF #3

Table 7-2 Uncertainties

Table 7-3 PA Findings Summary

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 2-1 Fire Training Areas

Figure 3-1 Non-Fire Training Areas

Figure 5-1 Adjacent Sources

Figure 6-1 Areas of Interest

Figure 6-2 Preliminary Conceptual Site Model

Figure 7-1 Summary of Findings

Appendices

Appendix A Data Resources

Appendix B Preliminary Assessment Documentation

B.1 Interview Records

B.2 Visual Site Inspection Checklists

B.3 Conceptual Site Model Information

Appendix C Photographic Log
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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Acronyms and Abbreviations

AASF

AECOM

Army Aviation Support Facility

AECOM Technical Services, Inc.

AFFF aqueous film forming foam

AOI Area of Interest

ANG Air National Guard

ARNG Army National Guard

bgs below ground surface

CERCLA Comprehensive Environmental Response, Compensation, and Liability

Act

CSM conceptual site model

EDRTM Environmental Data Resources, Inc.TM

°F degrees Fahrenheit

FSS fire suppression system

FTA fire training area

MRA Meridian Regional Airport

MSARNG Mississippi Army National Guard

NOAA National Oceanic and Atmospheric Administration

OWS oil/water separator

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

SI Site Inspection

US United States

USACE United States Army Corps of Engineers

USEPA United States Environmental Protection Agency

USGS United States Geological Survey

VSI Visual Site Inspection
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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Executive Summary

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

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

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

(PFAS)-containing materials was completed for the Meridian Army Aviation Support Facility

(AASF) #3 (also referred to as the “facility”) in Meridian, Mississippi to assess potential PFAS

release areas and exposure pathways to receptors. The performance of this PA included the

following tasks:

· Reviewed available administrative record documents and Environmental Data Resources,

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

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

environmental compliance actions in the area surrounding the facility;

· Conducted a site visit on 8 March 2019 and completed visual site inspections at locations

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

· Interviewed current Mississippi ARNG (MSARNG) personnel during the site visit as well as

environmental managers and operations staff. Follow-up interviews were also conducted with

operations staff following the site visit;

· Identified areas of interest (AOIs) and developed a preliminary conceptual site model (CSM)

to summarize potential PFAS source-pathway-receptor linkages for each AOI.

Two AOIs (referred to as “AOI 1” and “AOI 2”) related to potential PFAS release were identified at

AASF #3 during the PA. AOI 1 is the AFFF system tank located outside of the hangar building at

the facility. The tank has evidence of leaking and could be a potential source of PFAS release.

AOI 2 is the location of Tri-MaxTM Carts that were formerly stored on the wash rack. The fate of

the AFFF in the Tri-MaxTM units is unknown, and it is possible they were emptied at AOI 2 prior to

removal from AASF #3, creating a potential source of PFAS at the facility. The AOIs are shown

on Figure ES-1 and described in the Table ES-1 below. The preliminary CSM for AASF #3 is

presented in Figure ES-2.

Table ES- 1: AOIs at Meridian AASF #3

Area of Interest Name Used by Potential Release Date

AOI 1 AFFF System

Tank

AASF #3 Personnel 2015/2016

AOI 2 Tri-MaxTM Carts AASF #3 Personnel /

State Contractors

2007-2012

Based on the Environmental Protection Agency (USEPA) Unregulated Contaminant Monitoring

Rule 3 (UCMR3) data, it was indicated that no PFAS were detected in a public water system

above the USEPA Health Advisory (HA) within 20 miles of the facility. The HA is 70 parts per trillion

for PFOS and PFOA, individually or combined. PFAS analyses performed in 2016 had method

detection limits that were higher than currently achievable. Thus, it is possible that low

concentrations of PFAS were not detected during the UCMR3 but might be detected if analyzed

today.

Based on a potential PFAS release at these AOIs, there is potential for exposure to PFAS

contamination in media at or near the facility. The preliminary CSM for AASF #3, which presents

the potential receptors and media impacted, is shown on Figure ES-2.
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Summary of Findings

12420 Milestone Center Drive

Germantown, MD 20876

Meridian WTTP

Potential

ANG FTA

Key Field

Airport

Key Field ANG Base

B u rw e ll

Cr e ek

Sowashee Creek

Okatibbee Creek

0 800 1,600 3,200

Feet

AOI 1

AOI 2

Release Area A

Release Area B

No Suspected

Release Area A

0 150 300 600

Feet

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Wetland

River/Stream

Canal/Ditch

Pipeline

2
Media

SOURCE PATHWAY RE

AOI 1 & 2 Releases of AFFF

Potential 

PFAS in 

subsurface 

soil, surface 

soil, & 

surface 

water

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ 

Infiltration

Airborne Soil 

Particulate

Surface Soil 

Surface 

Water/ 

Sediment

Shallow 

Groundwater

Subsurface 

Soil

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

Ingestion

Ingestion

Ingestion

Ingestion

Hum

C

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

Site 

Worker

Cons

W

Site 

Worker

Cons

W

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Figure E

Preliminary Concep

Meridian 

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

Meridian AASF #3

Meridian, Mississippi

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1. Introduction

Authority and Purpose

The Army National Guard (ARNG) G9 is the lead agency in performing Preliminary Assessments 

(PAs) and Site Inspections (SIs) for Perfluorooctanesulfonic acid (PFOS) and Perfluorooctanoic 

acid (PFOA) at Impacted Sites at ARNG Facilities Nationwide. This work is supported by the 

United States (US) Army Corps of Engineers (USACE) Baltimore District and their contractor 

AECOM Technical Services, Inc. (AECOM) under Contract Number W912DR-12-D-0014, Task 

Order W912DR17F0192, issued 11 August 2017.

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

used per- and poly-fluoroalkyl substances (PFAS), 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 a Drinking Water Health 

Advisory (HA) for PFOA and PFOS in May 2016, but there are currently no promulgated national 

standards regulating PFAS in drinking water. The HA is 70 parts per trillion for PFOS and PFOA, 

individually or combined.

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

Support Facility (AASF) #3 (also referred to as the “facility”) in Meridian, 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 Army requirements and guidance. 

This PA documents potential locations where PFAS may have been used, stored, or released into 

the environment at AASF #3. The term PFAS will be used throughout this report to encompass all 

PFAS chemicals being evaluated, including PFOS and PFOA, which are key components of 

AFFF. 

Preliminary Assessment Methods

The performance of this PA included the following tasks: 

· Reviewed available administrative record documents and Environmental Data Resources, 

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

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

environmental compliance actions in the area surrounding the facility;

· Conducted a site visit on 8 March 2019 and completed visual site inspections (VSIs) at 

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

disposed;

· Interviewed current Mississippi ARNG (MSARNG) personnel during the site visit as well as 

environmental managers and operations staff. Follow-up interviews were also conducted with 

operations staff following the site visit; 
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Meridian, Mississippi

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· Identified areas of interest (AOIs) and developed a preliminary conceptual site model (CSM) 

to summarize potential PFAS source-pathway-receptor linkages for each AOI.

Report Organization

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

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

of each are as follows:

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

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

· Section 2 – Fire Training Areas: describes the fire training areas (FTAs) at the facility 

identified during the site visit. 

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

facility identified during the site visit. 

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

specifically in response to emergency situations. 

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

that are not under the control of ARNG. 

· Section 6 – 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 #3 is located southwest of the City of Meridian, at Meridian Regional Airport (also 

known as Key Field) (MRA), in Lauderdale County, Mississippi approximately 19 miles west of 

the Mississippi-Alabama Border (Figure 1-1). The facility houses the B Company 111th and 

comprises seven buildings on the 3.5-acre property including a hangar; storage, administration, 

hazmat and used oil buildings; and a fire pump house. The AASF #3 provides aviation and 

maintenance support primarily for helicopters. The facility was established in 1979, and 

interviewee involvement at the facility began in 1988. The property is leased by the state of 

Mississippi from the Meridian Airport Authority; the current lease is valid until 31 August 2061 

(Appendix A). 

Facility Environmental Setting

Lauderdale County is located in the Atlantic Plain Physiographic Region, which runs along the 

eastern and southern coast of the US, extending from Massachusetts down to the Gulf of Mexico. 

The Atlantic Plain is separated into two provinces; the continental shelf beyond the coastline and 

the interior portion known as the Coastal Plain, the inner edge of which is commonly accepted to 

be the extent of Cretaceous or Tertiary deposits (Fenneman, 1917). AASF #3 is situated in the 
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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East Gulf Coastal Plain, a belted section of the Coastal Plain between the Mississippian Alluvial

Plain and the Floridian Section that drains to the Gulf of Mexico (Fenneman, 1928).

1.5.1 Geology

AASF #3 overlies a thin deposit of Quaternary floodplain alluvium which, in the vicinity of the City

of Meridian, has often been reworked through construction. The soil underlying AASF #3 is

approximately 6 feet of fine sandy loam. Unaltered soil in the uplands are loamy and clayey, well

drained, and typically highly acidic (Allgood, 1983).

The main geologic formation underlying AASF #3 is the Wilcox Group; it comprises, in

stratigraphic order, the Hatchetigbee, Tuscahoma, and Nanafalia Formations corresponding to

the Upper, Middle, and Lower Wilcox. The Hatchetigbee consists of regressive nonmarine

sediments, gray to brown cross-bedded sands, and lignitic clay, and it has been eroded away

beneath the facility to an approximate thickness of several dozen feet (Leidos, 2019). Underlying

the Hatchetigbee is the gray lignitic sand of the Tuscahoma Formation (Figure 1-2), and it is often

laminated with gray clay and fossiliferous marls and reaches a thickness of approximately 350

feet. Beneath the Tuscahoma lies the Nanafalia Formation, which consists of buff-colored,

fossiliferous, glauconitic, calcareous sands, dark lignitic silt, clay and some gravel; it is

approximately 300 feet thick (CH2M Hill, 1992).

The Wilcox Group has not been significantly structurally deformed but does have a gentle regional

dip of 25 to 30 feet per mile to the south-southeast (Leidos, 2019).

1.5.2 Hydrogeology

The Middle and Lower Wilcox (Tuscahoma/Nanafalia Formations) are the principal aquifers in the

area (Figure 1-2). An EDRTM report included a well search for a 1-mile radius surrounding the

facility (Appendix A) and listed 49 registered state and federal wells, with 88% of the wells

situated within these two formations. Wells within the Lower Wilcox are set from 740 to 870 feet

below ground surface (bgs); static water levels measured in the 1970s and 80s within these wells 

are typically 12 to 21 feet bgs. Wells within the Middle Wilcox are set from 240 to 400 feet bgs; 

static water levels measured from 42 to 78 feet bgs (EDRTM, 2019). Using additional online

resources, such as state and local Geographic Information System databases, wells were

researched in a 4-mile radius of the facility. Well data from the US Geological Survey (USGS)

shows one industrial well and six domestic wells within 4 miles downgradient of the facility with

28 wells of unknown purpose (USGS, 2019).

Between approximately 2.5 and 3.5 miles south, southeast, and southwest of the facility, there

are domestic wells in the lower Hatchetigbee Formation that range in depth from 191 to 420 feet

bgs. While most wells in the vicinity of the facility are screened in the middle and lower formations,

these wells are shallower and more likely to be affected by potential contamination from the AASF

#3 area (Leidos, 2019).

Several monitoring wells are set within the Hatchetigbee Formation, about 1 miles to the south in

the center of the Key Field (Leidos, 2019); these wells are set 15 to 27 ft bgs. However, Figure

1-2 does not show all six wells at Key Field, and most wells displayed in that area are categorized

as “unknown” wells. GIS well data are occasionally incomplete due to the time of the data layer

compilation and incomplete data attributes for each well. In this case, the wells categorized as

“unknown” do not have information entered for the well use category. The groundwater within the

Wilcox Group flows to the south-southwest, following the structural dip of the formation (Figure

1-2). Groundwater flow direction at the facility is approximated to follow the same trend; however, 

local variations in flow direction to the west were noted at the adjacent Air National Guard (ANG)

Base located immediately to the south of the facility. Potable water supply to the facility is supplied

by the City of Meridian.
PFAS Preliminary Assessment Report

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Based on the USEPA Unregulated Contaminant Monitoring Rule 3 (UCMR3) data, it was indicated

that no PFAS was detected in a public water system above the USEPA Health Advisory (HA)

within 20 miles of the facility. The HA is 70 parts per trillion for PFOS and PFOA, individually or

combined. PFAS analyses performed in 2016 had method detection limits that were higher than

currently achievable. Thus, it is possible that low concentrations of PFAS were not detected during

the UCMR3 but might be detected if analyzed today.

Though no PFAS was detected in the public water system at the time of the UCMR analysis, an

SI performed by the adjacent ANG Base showed PFAS in groundwater immediately south of the

facility exceeding the HA.

1.5.3 Hydrology

The AASF #3 property is predominately impermeable, consisting of asphalt, concrete, and tarmac.

According to the site spill prevention, control, and countermeasures plan, surface flow is across

the site to the west, towards Okatibbee Creek and several emergent wetlands via outfalls located

to the west of the south apron (Bhate, 2011; Appendix A [Final Storm Water Pollution Prevention

Plan]).

According to the National Wetlands Inventory, there is an excavated lacustrine waterbody running

the length of Key Field to the west. Additionally, there are two small emergent wetland bodies

approximately 300 feet west of the AASF #3’s western boundary (Figure 1-3) (US Fish and

Wildlife Service (USFWS), 2019).

The major river system of the area, the Okatibbee River, is fed by Lake Okatibbee, a lacustrine

body of about 5.5 square miles which lies 10 miles north of AASF #3. The Okatibbee River runs

along the western edge of Key Field, where it is fed by Burwell Creek as well as other tributaries.

Regionally, AASF #3 lies within the Burwell Creek-Okatibbee Creek Watershed, and surface flow

is primarily to the south southwest.

1.5.4 Climate

Mississippi has a hot sub-tropical climate and averages an annual 58.8 inches of precipitation,

with April being the rainiest month, averaging over 7.19 inches of precipitation. Snowfall in

Mississippi is rare. Summer temperatures reach an average of 81.9 degrees Fahrenheit (°F) and

an average maximum of 92.5°F, with July being the hottest month. Winter months reach an

average temperature of 51.0°F, and minimum temperatures reach an average low of 39.7°F, with

January being the coldest month (National Oceanic and Atmospheric Administration [NOAA],

2019).

1.5.5 Current and Future Land Use

AASF #3 has a controlled access gate and is adjacent to Key Field at Meridian Regional Airport.

The facility provides aviation and maintenance support primarily for helicopters. Reasonably

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

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Lower Sowashee

Creek Watershed

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Meridian AASF #3

Meridian, Mississippi

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2. Fire Training Areas

While no official FTAs were identified at AASF #3 during the PA through interviews (Appendix B), 

historical document review, or the EDRTM, an area of the north apron was identified as a temporary 

training area for MSARNG personnel.

No Suspected Release Area A – North Apron 

Fire training of MSARNG personnel includes wheeled fire extinguisher unit training. Around 2000, 

a handful of the wheeled units were discharged to concrete at No Suspected Release Area A, on 

the North Apron. The exact contents of the extinguishers were not documented, but it is 

suspected, based on descriptions by MSARNG peronnel, that they were carbon dioxide 

extinguishers. According to interviews with AASF #3 personnel, the contents were described as 

a cold mist that left no residue. This is consistent with extinguishers filled with carbon dioxide 

rather than AFFF or other firefighting foams. This location has no suspected PFAS release 

(Figure 2-1).
No Suspected

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PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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3. Non-Fire Training Areas

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

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

booths, AFFF storage areas, and areas of compliance demonstrations. Two non-FTAs where 

AFFF was stored and/or potentially released were identified during the PA. Descriptions of the 

non-FTAs are presented below, and the locations of the non-FTAs are shown on Figure 3-1. The 

facility currently has 5 or 6 dry chemical portable units on the aprons that are maintained by the 

state, according to interviewees (the specific state agency was not specified). The kitchen is 

equipped with a restaurant-grade fire suppression system (FSS). No fueling infrastructure is 

located at AASF #3; fueling is performed by an off-site fueling truck. No emergencies requiring 

the use of foam have occurred. 

Release Area A – AFFF System Tank

The AASF #3 hangar is equipped with an AFFF suppression system. The system was installed in 

2007, and initial testing was completed with water only. The system consists of an approximately 

500-gallon upright tank that is located outside the hangar and connects to the pump room through 

the wall along the southeast corner. The location of the AFFF system tank is Release Area A. 

Floor drains within the pump room connect to an oil/water separator (OWS) that discharges to the 

sanitary sewer. The sanitary sewer discharges to the city of Meridian’s Wastewater Treatment 

Plant (WWTP). Sometime in 2015 – 2016 the tank bladder was replaced and refilled with AFFF 

by an outside contractor; the replacement was described as routine. Drips and resultant corroded 

paint on the upright tank are visible (Appendix C), indicating overfilling or spillage of AFFF. The 

system also has dedicated water tanks on which the valves have cracked twice, once in 2007 

during the installation of the system and once around 2017/2018. No release of AFFF occurred 

due to cracks in the water valves. Due to evidence of AFFF leaks, Release Area A is considered 

an area of potential PFAS release. 

Release Area B – Tri-MaxTM Carts

Between 2007 and 2011/2012, approximately 10 portable Tri-MaxTM units were kept at AASF #3; 

the units were stationed on the wash rack area at Release Area B (Figure 3-1). It is unknown 

specifically what the capacity of the units was, their concentration, and whether they were 

serviced or refilled. According to interviewees, a contractor (unknown company) for the State of 

Mississippi emptied the units prior to removing them from the facility. It is unknown if the AFFF 

contents were disposed of at the facility or if they were containerized and disposed of off-site. If 

the contents were disposed of on-site, it is possible that AFFF would have been rinsed into the 

wash pad which drains through the OWS and subsequently discharges to the sanitary sewer. 

AASF #3 personnel noted that holes were drilled into the Tri-MaxTM units prior to sending them to 

Camp Shelby for disposal. The final disposal location of the Tri-MaxTM units is unknown. Due to 

the uncertainty of how and where the AFFF was emptied, the location of Release Area B is 

considered an area of potential PFAS release (Figure 3-1).
Release

Area A

Release Area B

0 150 300 600

Feet

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Facility Boundary

River/Stream

Canal/Ditch

Pipeline

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PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

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4. Emergency Response Areas

No emergency response areas or incidents were identified within AASF #3 during the PA through

interviews (Appendix B), historical document review, or the EDRTM. The ANG responds to all

emergency incidents at AASF #3, though it is unknown when the ANG became the primary first

responders or if this has been protocol for the entire period of ARNG operation at the facility.
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

16

5. Adjacent Sources

Four potential off-facility sources of PFAS adjacent to AASF #3, not under the control of the ARNG, 

were identified during the PA. Based on interviews with MSARNG personnel (Appendix B) and 

historical document review, the identified adjacent areas with potential AFFF releases are outside 

the AASF #3 boundaries. Descriptions of the adjacent sources are presented below, and the 

locations of the areas are shown on Figure 5-1. Although the adjacent sources are generally 

located to the south of the facility, hydraulically downgradient, localized variations in groundwater 

flow direction may occur. Because Key Field ANG Base immediately abuts the southern border 

of the facility, it is unknown if variations in local groundwater flow could result in adjacent releases 

migrating to the facility. 

Meridian Wastewater Treatment Plant (WWTP) 

The Meridian WWTP is located approximately 0.75 miles southeast of AASF #3. Although no use 

of AFFF at the WWTP has been identified, WWTPs can be sources of PFAS. The OWSs at both 

Key Field ANG Base, discussed in Section 5.3 below, and the AASF #3 connect to the sanitary 

sewer system that discharges to the Meridian WWTP. Due to releases from the ANG Base and 

potential releases from AASF #3, the WWTP is an adjacent source of PFAS.

Key Field Airport 

Key Field Airport, also known as MRA, is a functional joint-use (civilian/military) airfield. AFFF use 

at the airport is unknown and is therefore considered a potential adjacent source of PFAS. 

Key Field ANG Base AFFF Releases 

The Mississippi ANG owns and operates a base at Key Field immediately south of AASF #3; AFFF 

releases have been documented at the ANG Base. The ANG performed an SI in 2019 and 

identified seven sites where PFAS constituents exceeded screening criteria (Leidos, 2019). 

Groundwater samples collected from areas immediately adjacent to the southern boundary of 

AASF #3 were determined to contain high levels of PFAS. Key Field ANG Base is shown on 

Figure 5-1, and summary information from the 2019 SI is provided in Table 5-1:

Table 5-1 Potential PFAS Sources at Key Field ANG Base

Site Description

Hangar 150 In 2002, a ruptured pipe in the FSS caused a discharge of 2,400 gallons 

of AFFF in the hangar. AFFF was washed into the OWS and a grassy 

area southeast of the hangar. Foam was reported to enter both the 

sanitary sewer and stormwater systems. AFFF traveled through Outfall 

002 and to a drainage ditch leading to Okatibbee Creek).

PFOS and PFOA were detected in both surface and subsurface soil 

samples at this release area. Combined PFOS and PFOA concentrations 

exceeded the HA in groundwater.

Hangar 160 The AFFF FSS was activated in 2013 for routine testing and released 

180 gallons of AFFF. The AFFF was discharged to the OWS for the 

hangar, and there was no suspected release to the environment 

surrounding the hangar.
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

17

PFOS and PFOA were detected in surface and subsurface soil samples.

The combined PFOS and PFOA concentrations in groundwater were

found to be equal to the HA.

Building 155 –

Fire Station

As of January 2019, the fire station houses seven vehicles containing

AFFF and an AFFF trailer. The vehicles were filled with AFFF in the fire

station’s bay using either 5-gallon buckets or a hose from the AFFF

trailer.

Soil was not sampled at this release area because it is surrounded by

concrete. Groundwater was sampled from a co-located well also used

for the Former AFFF Spray Test Area. Groundwater results show PFOS

and PFOA at this location exceeded the HA.

Building 104 –

Former Fuel Cell

Maintenance

Building 104 previously had an AFFF FSS. The installation date is

unknown, but the system was retrofitted with a water deluge system in

1992.

PFOS and PFOA were detected in surface and subsurface soil at this

release area. Combined PFOS and PFOA concentrations were found to

exceed the HA in groundwater.

Former AFFF

Spray Test Area

Annual AFFF spray system tests were conducted at this location until

2014, expending approximately 5-10 gallons of AFFF per firetruck and

AFFF trailer. The year testing started and total amount of AFFF released

are unknown. Runoff from the spray test area drains to the west, and the

storm water drainage pathway from the spray test area leads to a flood

control ditch. The ditch flows to the adjacent flood control levee and then

to Okatibbee Creek. AFFF expended in spray tests was left to dissipate

on pavement or washed into the surrounding grassy areas.

At this release area, PFOS and PFOA were detected in both surface and

subsurface soil. PFOS and PFOA, individually and combined, exceeded

the HA. Groundwater was sampled from a co-located well used for both

this release area and Building 155. Groundwater results show PFOS and

PFOA at this location exceed the HA.

Aircraft Parking

Apron

The aircraft parking apron was identified because two catch basins in the

grassy areas on the west end of the apron are downgradient of potential

release areas Hangar 160 and Building 155.

PFOS and PFOA were detected in surface and subsurface soil at this

release area. PFOS and PFOA both exceeded the HA in groundwater

samples.

Stormwater

Outfall 002

The outfall is not within Key Field boundaries, but it is located where

many AFFF releases would have been routed, including the release in

Hangar 150. The ANG outfall is located south (downgradient) of the

AASF #3 stormwater outfalls; however, it is unknown if the outfalls are

interconnected.

In the surface water sample at this release area, PFOS and PFOA

exceeded the HA. Soil and groundwater samples were not taken at this

location, but sampling results at Key Field may indicate that PFOS and

PFOA are present beyond the ANG Base boundary.
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

18

Potential ANG FTA 

AASF #3 interviewees recalled an ANG FTA on the western side of Key Field used for mock 

crashes in the mid-1990s. The mock crashes were set on fire and extinguished; it is unknown if 

AFFF were used as the fire suppressant. This FTA is likely the location of three former FTAs 

documented in the 2016 ANG PA that included mock crash FTAs. The location for the potential 

ANG FTA, which AASF #3 personnel indicated on a map, correlates with the location of the three 

FTAs in the ANG PA, located on the western side of Key Field. The FTAs were reported to have 

been active between 1960 and 1989 within the ANG PA. There is no documentation or recollection 

of AFFF being used at these locations. However, due to Air Force use of AFFF beginning in 1970, 

there is a possibility that PFAS were released at this location (HydroGeoLogic, 2016).
Meridian WTTP

B ur

well C reek

Okatibbee Creek

Sowashee Creek

Potential

ANG FTA

Key Field

Airport

Key Field ANG Base

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Adjacent Sources

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6. Preliminary Conceptual Site Model

Based on the PA findings, two potential release areas were designated as AOIs. The AOIs are 

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

preliminary CSMs developed for the AOIs. The CSM identifies the three components necessary 

for a potentially complete exposure pathway: (1) source, (2) pathway, and (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 are sparse and 

continue to be the subject of PFAS toxicological study. Receptors at Meridian AASF #3 include 

site workers, construction workers, and residents and recreators outside the facility boundary. The 

preliminary CSMs for the AOIs indicate which specific receptors could potentially be exposed to 

PFAS and are shown on Figure 6-2.

AOI 1 Release Area A – AFFF System Tank

AOI 1 encompasses Release Area A (Figure 6-1). The AASF #3 hangar is equipped with an AFFF 

FSS. The system is supplied by an approximately 500-gallon upright tank located on the southeast 

corner of the hangar. Since the system was installed in 2007, it has not been activated; however, 

the bladder reportedly was replaced approximately 2015 – 2016. Evidence of leaked/spilled AFFF 

is visible on the outside of the tank (Appendix C). The volume of AFFF released to the ground 

underneath the tank is unknown. Due to evidence of AFFF release from the tank, this area has 

been designated as an AOI.

If a release of foam occurred in this area, it could have migrated via surface water pathways. The 

storm drains flow off-facility to Okatibbee Creek. PFAS following this path would create a 

potentially complete pathway for surface water and sediment ingestion for site workers, 

construction workers, trespassers, and downstream off-facility residents and recreators of 

Okatibbee Creek. 

If the AFFF entered surface soil in the area of the AFFF System Tank as a result of spills, as 

photographs of corrosion on the tank support (Appendix C), there is the potential for PFAS to 

infiltrate further into subsurface soil and groundwater. PFAS entering surface soil would result in 

a potentially complete ingestion and inhalation pathway for surface soil to site workers and 

construction workers; subsurface soil for the construction worker; and groundwater for 

construction workers and off-facility residents with downgradient domestic water wells. Because 

access to the facility is controlled, trespasser exposure is considered incomplete.

AOI 2 Release Area B – Tri-MaxTM Carts

AOI 2 is the location of Release Area B, where Tri-MaxTM carts were stored (Figure 6-1). The fate 

of AFFF in the extinguishers, whether they were emptied in a way that AFFF was captured or if 

they were emptied into the area of the wash pad for it to disperse, is unknown. Had AFFF been 

emptied in the area of the wash pad, the potential release pathways for AFFF would be identical 

to the pathways described above in Section 6.1. AFFF may have drained through the wash pad 

to the OWS and subsequently to the Meridian WWTP via the sanitary sewer. Stormwater drains 

are located adjacent to the wash pad, any wash water or stormwater that is not captured by wash 

pad drains could carry PFAS via the storm drains off-facility to Okatibbee Creek.
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Meridian WTTP

Bu rwel l Cr e ek

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Burwell

Creek-Okatibbee

Creek Watershed Lower Sowashee

Creek Watershed

Potential ANG

FTA

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Airport

0 800 1,600 3,200

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No Suspected Release

Facility Boundary

Water Body

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Inferred Groundwater Flow Direction

Wells

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A! Monitoring Well

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AOI 2

Release Area A

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Media

SOURCE PATHWAY RE

AOI 1 & 2 Releases of AFFF

Potential 

PFAS in 

subsurface 

soil, surface 

soil, & 

surface 

water

Human 

Activities

Precipitation/ 

Run-Off

Leaching/ 

Infiltration

Airborne Soil 

Particulate

Surface Soil 

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Water/ 

Sediment

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Soil

Source Release Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

Dust

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Cons

W

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LEGEND

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Preliminary Concep

Meridian 

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

Meridian AASF #3

Meridian, Mississippi

23

7. Conclusions

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

use, storage, or release of AFFF and other PFAS-related activities at AASF #3. The PA findings 

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

Findings

Two AOIs related to potential PFAS releases (Table7-1) were identified at AASF #3 during the PA 

through interviews with facility personnel (Figure 7-1).

Table 7-1 AOIs at AASF #3

Area of Interest Name Used by Potential Release 

Dates

AOI 1 Release Area A AASF Personnel 2015/2016

AOI 2 Release Area B AASF Personnel / State 

Contractors 2007-2012

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

contamination in media at or near the facility. The preliminary CSM for AASF #3, which presents 

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

There are four potential adjacent sources of PFAS near AASF #3. Due to the proximity and history 

of AFFF release at the adjacent ANG facility, it is considered a potential adjacent source. The SI 

for the adjacent ANG Base showed PFAS exceeding the HA in groundwater immediately south of 

AASF #3. The Meridian WWTP to the southeast, a potential ANG FTA to the southwest, and Key 

Field Airport to the south are also potential adjacent sources of PFAS. Though the adjacent 

sources are downgradient of the facility, they are considered potential adjacent sources of PFAS 

due to their proximity and potential for contamination to AASF #3.

Uncertainties

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

PFAS-containing materials to have been stored, 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 disposition and use 

of PFAS in training, firefighting, or other non-traditional activities. 

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

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

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

regarding a facility’s historical and current PFAS-containing materials. Sometimes, the provided 

information was vague or conflicted with other sources. Gathered information has a degree of 

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

direct knowledge due to staffing changes, the time passed since PFAS were first used (1969 to 

present), and a reliance on personal recollection. Inaccuracies may arise in potential PFAS 

release locations, dates of release, volume of releases, and the concentration of AFFF used. 

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

enter the environment continually evolves.

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

of PFAS were reviewed, current personnel were interviewed, multiple persons were interviewed 
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

24

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

uncertainties associated with the PA are summarized in Table 7-1.

Table 7-2: Uncertainties

Area of Interest Source of Uncertainty

AOI 1: Release Area A – 

AFFF System Tank

The amount of AFFF released and exact timeframe of the leak 

are unknown.

AOI 2: Release Area B – 

Tri-MaxTM Carts

It is unknown if the AFFF contents of the Tri-MaxTM Carts were 

disposed of at the facility or if they were containerized and 

disposed of off-site.

General

A data gap exists between 1979, when the facility was 

established, and 1988. Firsthand knowledge of activities that 

occurred at AASF #3 dates back to 1988.

It is unknown if the stormwater outfalls between the facility and 

the ANG Base are connected prior to discharging to Okatibbee 

Creek.

Potential Future Actions 

Based on the absence (1988-present) of the release of PFAS-containing materials on the North 

Apron (No Suspected Release Area A), evidence does not indicate that current or former 

MSARNG activities in this area contributed to PFAS contamination in media at or near the facility. 

This area will not move forward in the CERCLA process.

Interviews and physical evidence indicate PFAS may have been introduced into the environment, 

thus, there is a potential for receptors to be exposed to PFAS as shown in the Preliminary CSM 

in Section 6. Table 7-4 summarizes the rationale used to determine if the AOIs should be 

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

ARNG will evaluate the need for an SI at Meridian AASF #3 based on the potential receptors, the 

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

Table 7-3: PA Findings Summary

Area of Interest Rationale Potential Future 

Action

AOI 1 Release 

Area A 

The AFFF System Tank has evidence of 

an AFFF leak on the outside of the tank.

Proceed to an SI, focus 

on soil, surface water, 

sediment, and 

groundwater

AOI 2 Release 

Area B 

There is a possibility AFFF from demilled 

Tri-MaxTM Carts was released at this 

location.

Proceed to an SI, focus 

on soil, surface water, 

sediment, and 

groundwater
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Meridian WTTP

Potential

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B u rw e ll

Cr e ek

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Release Area A

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8. References

Allgood, Velton C. 1983. Soil Survey of Lauderdale County, Mississippi. United States Soil

Conservation Service, Mississippi Agricultural and Forestry Experiment Station.

Bhate Associates (Bhate). 2011. Spill Prevention, Control, and Countermeasure Plan and Spill

Contingency Plan for Mississippi Army National Guard Army Aviation Support Facility #3,

Meridian, Mississippi. Contract Number: 10-A&E-34-F; Bhate Project Number: 9100134

CH2M Hill 1992. Site Investigation Report, 186th Tactical Reconnaissance Group, Key Field,

Meridian, Mississippi, Final, July.

Childress, S.C. 1973. Mississippi Geologic Names. Mississippi Geological, Economic, and

Topographic Survey, Bulletin 118

EDRTM. 2019. The EDRTM Radius Map Report with Geocheck. Target Property: Meridian AASF,

1551 65th Ave S, Meridian, MS 39307. Inquiry Number: 5660870.2s. May 22, 2109.

Fenneman, N.M. 1917. Physiographic Subdivision of the United States. Proceedings of the

National Academy of Sciences of the United States of America, Vol. 3, No.1 (Jan. 15,

1917), pp. 17-22.

Fenneman, N.M. 1928. Physiographic Divisions of the United States. Annals of the Association

of American Geographers, Vol. 18, No. 4 (Dec., 1928), pp. 261-353.

HydroGeoLogic. 2016. Preliminary Assessment Report for Perfluorinated Compounds,

Mississippi Air National Guard, 186th Air Refueling Wing, Meridian, Mississippi, Final.

Leidos. 2014. WORK PLAN FOR PRELIMINARY ASSESSMENT/SITE INVESTIGATION FOR

COMPLIANCE RESTORATION PROGRAM MISSISSIPPI AIR NATIONAL GUARD

(186th AIR REFUELINGWING) MERIDIAN, MISSISSIPPI.

Leidos. 2019. SITE INSPECTION REPORT FOR PERFLUOROOCTANE SULFONATE AND

PERFLUOROOCTANOIC ACID AT KEY FIELD, MISSISSIPPI. Contract Number

W9133L-14-D-0007; Task Order Number 0009

National Oceanic and Atmospheric Administration (NOAA). 2019. Climate Data Online.

https://www.ncdc.noaa.gov/cdo-web/. Accessed September 2019.

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

Preliminary Assessments under CERCLA. September.

United States Fish and Wildlife Service (USFWS). 2109. National Wetlands Inventory, Wetlands

Mapper. https://www.fws.gov/wetlands/data/mapper.html.

United States Geological Survey (USGS). 2019. https://waterdata.usgs.gov/nwis/gw. Accessed

September 2019.
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

Appendix A

Data Resources
PFAS Preliminary Assessment Report

Meridian AASF #3, MS

Data resources will be provided separately on CD. Data resources for Meridian AASF #3 include:

Meridian AASF #3 Site Background Documents

· 2017 Meridian Storm Water Pollution Prevention Plan, Volume 2, 1 March 2017

· 2014 Geologic Map of the Meridian South Quadrangle

· 2011 Meridian Spill Prevention, Control, and Countermeasure Plan and Spill Contingency

Plan, August 2011

Previous Investigations Completed

· 2019 The EDR Radius Maptm Report with GeoCheck®; Aerial Photo Decade Package; &

Certified Sanborn Map Report; Target Property Jackson AASF, 365 Shop Street, Jackson,

MS 46176.

· 2017 Jackson AASF Storm Water Pollution Prevention Plan (SWPPP), Volumes I & II

· 1972 Amendment to Lease Agreement, Jackson Municipal Airport Authority

Meridian AASF #3 Site Property Documents

· 2011 Meridian Lease Document, 12 August 2011
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

Appendix B

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

Appendix B.1

Interview Records
From: Chaney, Michael A 1SG USARMY NG MSARNG (USA) <michael.a.chaney24.mil@mail.mil> 

Sent: Saturday, May 30, 2020 8:49 AM

To: Witte, Joe <joe.witte@aecom.com>

Subject: [EXTERNAL] RE: [Non-DoD Source] ARNG PFAS: Meridian AASF - TriMax Units (UNCLASSIFIED)

Sir,

The AFFF tanks were removed from our facility and demilled and disposed of elsewhere. That is all that I 

know about them. Please let me know if you need further assistance 

Thanks 

MC

From: Witte, Joe <joe.witte@aecom.com>

Sent: Friday, May 29, 2020 9:57 AM

To: Chaney, Michael A 1SG USARMY NG MSARNG (USA) <michael.a.chaney24.mil@mail.mil>

Cc: Li, Jennifer J (Germantown) <jennifer.j.li@aecom.com>; Davis, Joe B CTR NG NGB ARNG (USA) 

<joe.b.davis36.ctr@mail.mil>; Gaines, Rita F NFG NG MSARNG (USA) <rita.f.gaines.nfg@mail.mil>

Subject: RE: [Non-DoD Source] ARNG PFAS: Meridian AASF - TriMax Units (UNCLASSIFIED)

All active links contained in this email were disabled. Please verify the identity of the sender, 

and confirm the authenticity of all links contained within the message prior to copying and 

pasting the address to a Web browser. 

Hello Mr. Chaney,

I’m assisting my colleague, Jennifer Li, with the completion of the Meridian AASF PFAS PA Report. So, 

first of all, thank you for your continued support and for the information you provided below. We just 

have a few more questions:

- Do you/the personnel who de-milled the tanks recall how the state contractor emptied the AFFF 

from the units? Was the AFFF emptied into a tote or frac tank and taken away for disposal or 

were they emptied to the ground or a drain?

- Where was the De-milling performed at the facility?

If you can provide answers to these questions, or simply let us know that the answers to the questions 

are unknown/undocumented, we should have sufficient information to complete our report.

Thanks again Mr. Chaney. We look forward to hearing back from you.

Joe Witte

Environmental Scientist, Remediation, DC Metro Region

D +1-301-944-3617 (NEW)

M +1-301-300-9873
joe.witte@aecom.com < Caution-mailto:joe.witte@aecom.com >

AECOM

12420 Milestone Center Drive

Suite 150

Germantown, MD 20876, USA

T +1-301-250-2934(NEW)

aecom.com < Caution-http://www.aecom.com/ >

Built to deliver a better world

LinkedIn < Caution-http://www.linkedin.com/company/aecom_15656 > Twitter < Cautionhttp://twitter.com/AECOM > Facebook < Cautionhttp://www.facebook.com/AecomTechnologyCorporation > Instagram < Caution-http://instagram.com/aecom >

From: Chaney, Michael A 1SG USARMY NG MSARNG (USA)

<michael.a.chaney24.mil@mail.mil < Caution-mailto:michael.a.chaney24.mil@mail.mil > >

Sent: Monday, March 02, 2020 1:26 PM

To: Li, Jennifer J (Germantown) <jennifer.j.li@aecom.com < Caution-mailto:jennifer.j.li@aecom.com > >

Subject: RE: [Non-DoD Source] ARNG PFAS: Meridian AASF - TriMax Units (UNCLASSIFIED)

CLASSIFICATION: UNCLASSIFIED

Jennifer,

Sorry for the delay but I did talk to the guys that DE milled those tanks for turn in. It was done here and 

both of the guys that did it said that someone from the state came and emptied them for them prior to 

them being de milled. However they did not have a point of contact of which company it was . Again 

sorry for the delay but at least now we have an answer. If you have any more questions for me feel free 

to email or call me

Thanks

Mike 

From: Li, Jennifer J (Germantown) <jennifer.j.li@aecom.com < Caution-mailto:jennifer.j.li@aecom.com > >

Sent: Friday, February 28, 2020 9:12 AM

To: Chaney, Michael A 1SG USARMY NG MSARNG (USA) <michael.a.chaney24.mil@mail.mil < Cautionmailto:michael.a.chaney24.mil@mail.mil > >

Cc: Davis, Joe B CTR NG NGB ARNG (USA) <joe.b.davis36.ctr@mail.mil < Cautionmailto:joe.b.davis36.ctr@mail.mil > >; Gaines, Rita F NFG NG MSARNG (USA) 

<rita.f.gaines.nfg@mail.mil < Caution-mailto:rita.f.gaines.nfg@mail.mil > >

Subject: [Non-DoD Source] ARNG PFAS: Meridian AASF - TriMax Units

All active links contained in this email were disabled. Please verify the identity of the sender, 

and confirm the authenticity of all links contained within the message prior to copying and 

pasting the address to a Web browser.
Good morning Mr. Chaney,

Thank you again for speaking with us on Tuesday. As a follow up, were you able to speak with other 

personnel to determine if, how, and where the former TriMax units were emptied at the AASF prior to 

turning them in?

Have a good weekend,

Jen

Jennifer J. Li

Project Manager/Environmental Scientist

D +1-301-944-2344(NEW)

M +1-301-717-6939(NEW)

jennifer.j.li@aecom.com < Caution-mailto:jennifer.j.li@aecom.com > < Caution-Cautionmailto:jennifer.j.li@aecom.com >

AECOM

12420 Milestone Center Drive

Suite 150

Germantown, MD 20876, USA

T +1-301-250-2629 (NEW)

aecom.com < Caution-Caution-http://www.aecom.com/ >
PA Interview Questionnaire - Other Facility: AASF #3 Meridian, MS

Interviewer:

Date/Time: 8 March 2019 @ 0800 

Interviewee:__See Below________________

Title:__________________________________

Phone Number:_________________________

Email:_______________________________

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

Can you recommend anyone we can interview?

Y or N __________________________

Roles or activities with the Facility/Years working at the Facility:

, Production Control, Alternate Environmental Compliance Officer, 11 years

, Backshop and Building Maintenance Supervisor, 24 years

, Grounds Maintenance, 31 years

PFAS Use: Identify accidental/intentional release locations, time frame of release, frequency of releases, 

storage container size (maintenance, fire training, firefighting, buildings with suppression systems (as 

builts), fueling stations, crash sites, pest management, recreational, dining facilities, metals plating, or 

waterproofing). How are materials ordered/purchased/disposed/shared with others?

Facility Background: Established in 1979, Support facility, B Company 111th, 

chinooks only. State Troops come in for classroom and simulation training. 

Prior to 1979, Key Field airport was used as a WWII base.

No official Fire Training Areas. Training of the 111th includes fire extinguisher 

training with wheeled units. No foam expended. In approximately 2000 a 

couple of the wheeled units were discharged to the concrete of the North 

Apron. The contents were described as a “mist” that was cold and left no 

residue on the concrete. The expended units were most likely CO2

extinguishers. 

Hangar has an AFFF suppression system consisting of an approximate 500-

gallon upright tank that is located outside of the hangar along the 

southeastern corner. The system was installed in 2007 (tank is date 

stamped). Initial testing of the system was with water only, no foam was used 

during the test. Approximately 3-4 years ago, the bladder in the tank was 

replaced by an outside contractor and the tank refilled with AFFF. The 

replacement was described as routine. Drips from tank overfill or spillage are 

present on the outside of the AFFF storage tank (see photos). The paint on 

the exterior of the tank appears corroded where the drips are. The pump 

room is located inside the hangar building, floor drains within the room drain 

to the OWS and subsequently to the sanitary sewer. No leaks observed in 

the pump room during site visit. System has dedicated water tanks. The 

water valve has cracked and leaked water twice but only water was released 

– once right after it was installed in in 2007 and once around 2017/2018. 

No emergencies requiring the use of foam have occurred.

Known Uses

Use 

Procurement

Disposition

Storage (Mixed)

Storage (Solution)

Inventory, Off-Spec

Containment

SOP on Filling

Leaking Vehicles

Nozzle and Suppression 

System Testing

Dining Facilities

Vehicle Washing

Ramp Washing

Fuel Spill Washing and 

Fueling Stations

Chrome Plating or 

Waterproofing 
PA Interview Questionnaire - Other Facility: AASF #3 Meridian, MS

Interviewer:

Date/Time: 8 March 2019 @ 0800 

There is no bulk storage of AFFF at the facility. No fire trucks were ever stationed at the facility. 

Air Guard provides emergency response for the facility. Fire training at the AASF is practical in 

nature regarding facility and equipment/vehicle operations. Interviewees did not recall ANG 

spraying any suppressants during such training.

The facility currently has approximately 5-6 portable units that are stored outside on the apron. 

The units observed during the site visit were dry chemical. Portable units are maintained by the 

State (direct follow up questions to via separate interview). 

Between 2007 and 2011/2012, approximately 10 portable Trimax units were at the facility. 

Interviewees recalled they were bright green in color. Capacity, concentration, and whether they 

were serviced or refilled was unknown. Interviewees said that holes were drilled into the canisters 

to empty prior to turning into USFPO warehouse at Camp Shelby. Ask 

(Maintenance Supervisor) about details on this event: where emptied, how much, concentration, 

etc. 

No fueling operations are present on the facility. A fueling truck comes in to fuel on the pad.

Kitchen has restaurant grade suppression system over stove (photo).

ANG base immediately south of ARNG AASF has known AFFF releases. ANG conducting own 

PA/SI. ARNG interviewees pointed out an additional ANG FTA potentially not mentioned in the

ANG PA. In the mid-1990s, interviewees recalled an ANG FTA on the western side of the 

runways – saw mock crashes set on fire and put out, unknown if AFFF or what suppressant was 

used. Recalled ARNG landing a helicopter in that area and how difficult it was because there is 

metal sticking out of the ground.

Tank farm (private) located immediately north of the facility. Interviewees have never seen a fire 

truck in that area. No fire suppression systems observed from afar.

Use of AFFF at the commercial hangars at Key Field airport is unknown. 

Drinking water is supplied by the City of Meridian (likely from the Okatibee Reservoir). 

City WWTP is located immediately east of the airport.
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

Appendix B.2

Visual Site Inspection Checklists
Visual Site Inspection Checklist

Names(s) of people performing VSI:

Recorded by:

ARNG Contact:

Date and Time:

Method of visit (walking, driving, adjacent):

Source/Release Information

Site Name / Area Name / Unique ID: AASF#3 Meridian,

3.5 acres

Historic Site Use (Brief Description):

Current Site Use (Brief Description):

Physical barriers or access restrictions:

1. Was PFAS used (or spilled) at the site/area? Y / N

1a. If yes, document how PFAS was used and usage time (e.g., fire fighting training 2001 to 2014):

2. Has usage been documented? Y / N

2a. If yes, keep a record (place electronic files on a disk): 

No formal documentation of AFFF FSS bladder replacement.

3. What types of businesses are located near the site? Industrial / Commercial / Plating / Waterproofing / Residential

3a. Indicate what businesses are located near the site

4. Is this site located at an airport/flightline? Y / N

4a. If yes, provide a description of the airport/flightline tenants:

AASF located on northern portion of the airport. Othere tenets unknown except for ANG Base.

March 8, 2019 0800

Walking

Site / Area Acreage:

Access Resticted with controlled access gate.

AFFF FSS present on site. Outdoor AFFF tank shows signs of dripped/spilled AFFF on outside of the tank. 

Historical TriMax units may have been demilled onsite, disposition of AFFF contents unknown.

Adjacent Key Field airport, ANG Base, and WWTP

Estabilshed in 1979 as a support facility

Houses the B Company 111th and provides aviation and maintenance support 

primarily for helicopters.

Page 1 of 4
Visual Survey Inspection Log

1. Does the facility have a fire suppression system? Y / N

1a. If yes, indicate which type of AFFF has been used:

1b. If yes, describe maintenance schedule/leaks:

1c. If yes, how often is the AFFF replaced:

AFFF replaced when bladder was replaced.

1d. If yes, does the facility have floor drains and where do they lead? Can we obtain an as built drawing?

Lead to OWS and subsequently the sanitary sewer.

Transport / Pathway Information

1. Does site/area drainage flow off installation? Y / N

1a. If so, note observation and location:

surface flow is across the site to the west, towards Okatibbee Creek 

2. Is there channelized flow within the site/area? Y / N

2a. If so, please note observation and location: 

facility is predominantly paved with storm water flow to the west to the creek

3. Are monitoring or drinking water wells located near the site? Y / N

3a. If so, please note the location: 

4. Are surface water intakes located near the site? Y / N

4a. If so, please note the location: 

5. Can wind dispersion information be obtained? Y / N

5a. If so, please note and observe the location.

6. Does an adjacent non-ARNG PFAS source exist? Y / N

6a. If so, please note the source and location.

6b. Will off-site reconnaissance be conducted? Y / N

Facility drinking water sourced from the City of Meridian. Several unknown well types downgradient of the 

facility, a few domestic wells approx. 3 miles downgradient

ANG Base at Key Field along southern border of the AASF. ANG Base has documented AFFF releases.

Other Significant Site Features: 

Migration Potential:

AFFF FSS in hangar, external AFFF tank with dedicated water tanks. Type of AFFF unknown 

AFFF tank bladder replaced approx. 2015/2016 by outside contractor. No documentation available.

Page 2 of 4
Visual Survey Inspection Log

1. Has the infrastructure changed at the site/area? Y / N

1a. If so, please describe change (ex. Structures no longer exist): 

2. Is the site/area vegetated? Y / N

2a. If not vegetated, briefly describe the site/area composition:

3. Does the site or area exhibit evidence of erosion? Y / N

3a. If yes, describe the location and extent of the erosion: 

patches of unvegetated ground, little erosional evidence

4. Does the site/area exhibit any areas of ponding or standing water? Y / N

4a. If yes, describe the location and extent of the ponding: 

Receptor Information

1. Is access to the site restricted? Y / N

1a. If so, please note to what extent:

2. Who can access the site? 

2a. Circle all that apply, note any not covered above: 

3. Are residential areas located near the site? Y / N

3a. If so, please note the location/distance: 

4. Are any schools/day care centers located near the site? Y / N

4a. If so, please note the location/distance/type: 

5. Are any wetlands located near the site? Y / N

5a. If so, please note the location/distance/type: 

two small emergent wetlands near the western boundary of the facility

Site Workers / Construction Workers / Trespassers / Residential / Recreational 

Users / Ecological

Access restricted by controlled access gate

Significant Topographical Features: 

facility is mostly paved with patches of grass between paved areas

Page 3 of 4
Visual Survey Inspection Log

Additional Notes

Photographic Log

Photo ID/Name Date & Location Photograph Description

Page 4 of 4
PFAS Preliminary Assessment Report

Meridian AASF #3

Meridian, Mississippi

Appendix B.3

Conceptual Site Model Information
Preliminary Assessment – Conceptual Site Model Information

Site Name: Meridian AASF #3, Mississippi

Why has this location been identified as a site? 

Facility is an AASF. AFFF FSS on site, TriMax units historically present

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

AASF located on Key Airfield. Air National Guard Base located immediately south of AASF

Training Events

Have any training events with AFFF occurred at this site? Not with AFFF

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? Generally to the west via storm drain system

Average rainfall? 58.8 inches annually

Any flooding during rainy season? Unknown

Direct or indirect pathway to ditches? Storm drain outfalls to the west

Direct or indirect pathway to larger bodies of water? storm drains lead to Okatibbee Creek

Does surface water pond any place on site? No

Any impoundment areas or retention ponds? No

Any NPDES location points near the site? 3 Outfalls located along the western boundary and 

northwest corner of the AASF

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

Groundwater:

Groundwater flow direction? Approximately south/southwest. Local differences in flow may trend more 

west.

Depth to groundwater? 15-27 ft bgs

Uses (agricultural, drinking water, irrigation)? Downgradient domestic approx. 3 miles away

Any groundwater treatment systems? No

Any groundwater monitoring well locations near the site? Not on facility, some monitoring wells on 

ANG Base and Key Field

Is groundwater used for drinking water? No

Are there drinking water supply wells on installation? No

Do they serve off-post populations? N/A

Are there off-post drinking water wells downgradient Yes approx. 3 miles downgradient to the south

Waste Water Treatment Plant:

Has the installation ever had a WWTP, past or present? No, Meridian WWTP (municipal) located to the 

east across highway

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? No

Is surface water from potential contaminated sites treated? No

Equipment Rinse Water

1. Is firefighting equipment washed? Where does the rinse water go? No

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

after use? Where does the rinse water flow after cleaning nozzles? N/A

3. Other? 
Preliminary Assessment – Conceptual Site Model Information

Identify Potential Receptors:

Site Worker Yes

Construction Worker Yes

Recreational User Yes – off site

Residential Yes – off site

Child Yes – off site

Ecological Yes

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

Surrounding area is predominantly industrial/commercial

Documentation

Ask for Engineering drawings (if applicable).

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

Meridian AASF #3

Meridian, Mississippi

Appendix C

Photographic Log
Preliminary Assessment Report

Army Aviation Support Facility - Meridian, MS

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Meridian AASF Meridian, Mississippi

Photograph No. 1

Description:

Non-AFFF restaurant-grade 

fire suppression system above 

stove in the AASF kitchen. 

Photograph No. 2

Description: 

Close-up of the cooking range 

suppression system details.
Preliminary Assessment Report

Army Aviation Support Facility - Meridian, MS

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Meridian AASF Meridian, Mississippi

Photograph No. 3

Description:

Image of portable dry 

chemical fire extinguisher

located on the flight apron and 

a close-up of its details.

Photograph No. 4

 

Description: 

Tag from water sprinkler 

system inspection.
Preliminary Assessment Report

Army Aviation Support Facility - Meridian, MS

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Meridian AASF Meridian, Mississippi

Photograph No. 5

 

Description:

AFFF deluge system control 

room (left) and image of 

outdoor AFFF tank with 

evidence of AFFF drips/spill.

Photograph No. 6

 

Description: 

Rust on AFFF tank, indicating 

potential spills (left), and 

staining on ground below 

AFFF tank water valve (right).
Preliminary Assessment Report

Army Aviation Support Facility - Meridian, MS

Perfluorooctane-Sulfonic Acid (PFOS) and 

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

AECOM

APPENDIX C – Photographic Log

Army National Guard, Preliminary

Assessment for PFAS Meridian AASF Meridian, Mississippi

Photograph No. 7

 

Description

AFFF tank with evidence 

of spills (left), AFFF tank 

certification information 

(right).