FINAL 

Preliminary Assessment Report

Fresno TASMG, California

Perfluorooctane-Sulfonic Acid (PFOS) and Perfluorooctanoic 

Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

February 2020

Prepared for:

Army National Guard Headquarters

111 S. George Mason Drive

Arlington, VA 22204

US Army Corps of Engineers, Baltimore District

2 Hopkins Plaza

Baltimore, MD 21201

Prepared by:

AECOM

12420 Milestone Center Drive, Suite 150

Germantown, MD 20876

aecom.com

Contract Number: W912DR-12-D-0014

Delivery Order: W912DR17F0192
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Fresno TASMG, California

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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 ....................................................................................6

Soil...................................................................................................................6

Geology ...........................................................................................................6

Hydrogeology ..................................................................................................7

Hydrology ........................................................................................................7

Climate ............................................................................................................7

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

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

2.1 Wash Rack ...............................................................................................................12

2.2 Hangar Training Area ...............................................................................................12

3. Non-Fire Training Areas.....................................................................................................14

3.1 East Airfield Taxiway.................................................................................................14

3.2 Corrosion Control Facility .........................................................................................14

3.3 AVCRAD Hangar......................................................................................................14

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

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

5.1 Fresno Air National Guard Base...............................................................................17

5.2 Fresno ARFF ............................................................................................................17

5.3 Former Fire Training Area #1 ...................................................................................17

5.4 Former Fire Training Area #2 ...................................................................................17

5.5 Private Aviation Companies at Fresno Yosemite International Airport......................18

5.6 California Department of Forestry and Fire Protection.............................................18

5.7 California Highway Patrol Aviation Facility ...............................................................18

5.8 Former Marine Corps Facility ...................................................................................18

5.9 Aramark Uniform Services .......................................................................................18

5.10 1994 Learjet Crash...................................................................................................19

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

6.1 AOI 1: Hangar Training Area ...................................................................................21

6.2 AOI 2: Wash Rack and East Airfield Taxiway ..........................................................22

7. Conclusions .......................................................................................................................25

7.1 Findings....................................................................................................................25

7.2 Uncertainties ............................................................................................................26

7.3 Potential Future Actions ...........................................................................................27

References..................................................................................................................................29
PFAS Preliminary Assessment Report

Fresno TASMG, California

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Tables

Table ES-1 AOIs at Fresno TASMG

Table 7-1 AOIs at Fresno TASMG

Table 7-2 Uncertainties

Table 7-3 PA Findings Summary

Figures

Figure ES-1 Summary of Findings

Figure ES-2 Preliminary Conceptual Site Model, Fresno TASMG

Figure 1-1 Fresno TASMG 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, Fresno TASMG

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

Fresno TASMG, California

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Acronyms and Abbreviations

AECOM AECOM Technical Services, Inc.

AFFF aqueous film forming foam

amsl above mean sea level

ANGB Air National Guard Base

AOI area of interest

ARFF Aircraft Rescue and Firefighting

ARNG Army National Guard 

AVCRAD Aviation Classification Repair Activity Depot

bgs below ground surface

CAARNG California Army National Guard

CAL FIRE California Department of Forestry and Fire Protection

CERCLA Comprehensive Environmental Response, Compensation, and Liability Act

CSM conceptual site model

EDR Environmental Data Resources

°F degrees Fahrenheit 

FAA Federal Aviation Administration

FBO Fixed Base Operator

ft feet

FTA fire training area

HAZMAT hazardous materials

NOAA National Oceanic and Atmospheric Administration

PA Preliminary Assessment

PFAS per- and poly-fluoroalkyl substances

PFHxS perfluorohexane sulfonic acid

PFOA perfluorooctanoic acid

PFOS perfluorooctanesulfonic acid

ppt parts per trillion

PRL potential release location

RSL regional screening level

SI Site Inspection

TASMG Theater Aviation Sustainment Maintenance Group

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

Fresno TASMG, California

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Executive Summary

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

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

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

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

Impacted Sites at ARNG Facilities Nationwide. The ARNG is assessing the potential exposure to 

humans and the effect on the environment 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 the California (CA) ARNG (CAARNG) Fresno 1106th Theater 

Aviation Sustainment Maintenance Group (TASMG) in Fresno, California, 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

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

• Conducted a 1-day site visit on 7 March 2019

• Interviewed current Fresno TASMG personnel during the site visit including the CAARNG

Aircraft Maintenance Officer and other facility operations staff; and, Fresno Aircraft Rescue

and Firefighting (ARFF) personnel

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

documented with photographs

• Identified areas of interest (AOI) and developed a preliminary conceptual site model (CSM)

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

groundwater, surface water, and sediment for each AOI

Two AOIs related to potential PFAS releases were identified at Fresno TASMG during the PA. The 

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

Table ES-1: AOIs at Fresno TASMG

Area of Interest Name Used by Release Dates

AOI 1 Hangar Training 

Area CAARNG Potentially as early as 2008

AOI 2

Wash Rack and 

East Airfield 

Taxiway

CAARNG Potentially as 

early as 2007

Based on information obtained during the PA at these AOIs, there is potential for exposure to 

PFAS contamination in media at or near the facility. Based on the US Environmental Protection 

Agency (USEPA) Unregulated Contaminant Monitoring Rule 3 data, it was indicated that no PFAS 

were detected in a public water system above the USEPA lifetime Health Advisories within 20 

miles of the facility. As of June 2019, PFAS were sampled and detected below the Health 

Advisories from the off-facility public water supply well that supplies drinking water to the facility 

and is adjacent to the eastern facility property line. The PFAS data for this well are included in 

Appendix A. The preliminary CSM for Fresno TASMG, which presents the potential receptors 

and media impacted is shown on Figure ES-2.
Rogers Helicopters, Inc

California Highway Patrol Aviation Facility

CAL Fire Facility

SkyWest Airlines Hangar

Signature TECHNICAir Facility ARFF Test

Foam Area

ARFF Fire Station

and Test Foam Area

Former Fire

Training Area #1

ARFF Test Foam Area Former Marine

Corps Facility

Former Fire

Training Area #2

Signature Fixed Based

Operator Hangar

Aramark Uniform

Services

1994 Learjet

Crash

Fresno Air National

Guard Base

AVCRAD Hangar

Corrosion Control Facility

East Airfield Taxiway

Wash Rack Hangar Training Area

AOI 2

AOI 1

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Canal/Ditch

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12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 250 500 1,000

Feet

0 1,300 2,600 5,200

Feet

2
Media

SOURCE PATHWAY RECEPTOR

AOI 1

AOI 2

Fire Training and 

Mobile Fire 

Extinguishers 

Discharge

PFAS in 

surface soil

Human 

activities

Precipitation/ 

run-off

Leaching/ 

infiltration

Airborne soil 

particulate

Surface soil 

at AOI

Surface 

water/ 

sediment

Subsurface 

soil

Shallow 

groundwater

Source Release 

Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

dust

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-chart continues

Partial/ possible flow

Flow-chart stops

Incomplete pathway

Possible complete pathway

Complete pathway

/ /

Site 

Worker

Construction 

Worker Resident Trespasser/ Recreational User

Site 

Worker

Construction 

Worker Resident

/ / / /

/ / / /

/ / / /

/ / / /

LEGEND

Figure ES-2

Preliminary Conceptual Site Model

Fresno TASMG, CA

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

Trespasser/ 

Recreational User

1. The resident receptor refers to an off-site

resident.

2. Current risk practice suggests the exposure 

pathway for dermal contact is insignificant

compared to ingestion, but supporting data 

are sparse and continue to be studied. 

Notes:

/

3
PFAS Preliminary Assessment Report

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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)-Installations & Environment Division, Cleanup Branch contracted 

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

Inspections (VSIs) 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) (a suite of related chemicals), 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. In the absence of federal maximum 

contaminant levels, some states have adopted their own drinking water standards for PFAS. On 

13 July 2018, under the authority of the Deputy Director of the Division of Drinking Water, 

California issued drinking water notification levels of 14 parts per trillion (ppt) for PFOA and 13 

ppt for PFOS. Notification levels are non-regulatory health-based advisory levels established for 

contaminants in drinking water for which maximum contaminant levels have not been established. 

This report presents findings of a PA for PFAS at California (CA) ARNG (CAARNG) Fresno 1106th

Theater Aviation Sustainment Maintenance Group (TASMG) in Fresno, California (also referred 

to as “the facility”), in accordance with the Comprehensive Environmental Response, 

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

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

requirements and guidance. 

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

PFAS may have been released to the environment at Fresno TASMG. The term PFAS will be 

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

and PFOA, which are key components AFFF.

1.2 Preliminary Assessment Methods

• Reviewed available administrative record documents and Environmental Data Resources

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

• Conducted a 1-day site visit on 7 March 2019

• Interviewed current Fresno TASMG personnel during the site visit including the CA ARNG 

Aircraft Maintenance Officer and other facility operations staff; and, Fresno Aircraft Rescue 

and Firefighting (ARFF) personnel

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

documented with photographs 
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• Identified areas of interest (AOIs) and developed a preliminary conceptual site model (CSM) 

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

groundwater, surface water, and sediment for each AOI

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 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 – 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 Fresno 1106th TASMG, formerly known as the Fresno California Aviation Classification Repair 

Activity Depot (AVCRAD), is located at 5168 East Dakota Avenue, Fresno, California. The mission 

of the TASMG is to provide support of ARNG aviation activities through depot-level and limited 

aviation intermediate unit maintenance. The TASMG provides support to 13 western states, 18 

Army Aviation Support Facilities, and over 500 rotary wing aircrafts (Radian International, 1991). 

CA ARNG leased property from the City of Fresno Airport Authority starting in 1978 and the 

AVCRAD property was constructed in approximately 1985. The lease was recently amended to 

extend to 2058 (Radian International, 1991; White, T., 2019). 

The facility borders the Fresno Yosemite International Airport to the northeast and is situated in 

the center of San Joaquin Valley in the southern portion of California’s Central Valley (Figure 1-

1). The facility is about 115 miles east of the Pacific Ocean and 170 miles south of Sacramento.

The latitude, longitude, and surface elevation at the main gate of the facility are 36°47’11.2” N;

119°43’11.6” W, and 350 feet (ft) above mean sea level (amsl), respectively. 
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Fresno TASMG, California

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1.5 Facility Environmental Setting

Fresno TASMG occupies approximately 48 acres of land that are primarily composed of 

impervious surfaces. In addition to the adjoining Fresno Yosemite International Airport, residential 

communities are to the north of the facility, and commercial areas are to the northeast and east.

Fresno TASMG is in a relatively flat area with no significant natural topographic features. The 

surface elevation ranges from 326 to 344 ft amsl. The general topographic gradient is west/ 

southwest.

Soil

As indicated in the 2019 EDR report (Appendix A), there are three major soil components found 

at the Fresno TASMG property: Atwater, Delhi, and Handford. The properties of each soil 

component are listed below. 

Soil 

Component 

Name

Soil 

Surface 

Texture

Hydrologic 

Group

Soil 

Drainage 

Class

Hydric 

Status

Corrosion 

Potential

Atwater Loamy Sand Class B Well drained Not hydric Moderate

Delhi Loamy Sand Class A Somewhat 

excessively 

drained

Partially 

hydric

Moderate

Handford Sandy Loam Class B Well drained Not hydric Moderate

During a Phase I Preliminary Site Assessment by Leedshill-Herkenhoof Inc. (1990), soil samples 

were collected from five soil borings near an aboveground storage tank at the facility. The borings 

were advanced to 15 to 30 ft below ground surface (bgs) and were found to contain soils of 

unconsolidated to moderately consolidated sands and clayey sands material. The moisture 

content varied with the clay content, as clay-free soils were found to be generally less moist than 

clay-containing sands (Radian International, 1991). 

Geology

Fresno TASMG is located along the eastern margin of California’s San Joaquin Valley. In the San 

Joaquin Valley, the principle freshwater-bearing units are the unconsolidated deposits that extend 

to depths of 3,500 ft bgs. The unconsolidated valley floor alluvium deposits are characterized by 

fine-grained silt and sand. Localized clay beds are also common below 200 ft bgs. Finer 

sediments such as silts and clays are associated with overbank and floodplain deposits, whereas 

coarser sediments such as sands and gravels are associated with levee, channel lag, and point 

bar deposits (BB&E, Inc. 2016).

The Sierra Nevada Mountains form the physiographic barrier on the eastern side of the San 

Joaquin Valley. Groundwater stored in the alluvial deposits is bounded on the eastern flanks and 

below by the consolidated Cretaceous and Tertiary sedimentary rocks and Sierra Nevada granitic 

rocks. Water-bearing zones contain a higher percentage of sand compared to the intervening 

aquitards, which are primarily silt with secondary sand and clay (Page and LeBlanc, 1969). 
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Fresno TASMG, California

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Hydrogeology

Fresno TASMG lies within the Kings Subbasin of the San Joaquin Valley Groundwater Basin.

Groundwater is found in the unconfined or semi-confined conditions within alluvial fan deposits in 

the eastern portion of the Central Valley, where Fresno TASMG is located. Seven water-bearing 

zones have been identified in the vicinity of the TASMG. 

As indicated in the 2019 EDR report (Appendix A), twenty-one wells are located within a onemile radius of the Fresno TASMG. Eleven of the twenty-one wells are listed as federal United 

States Geological Survey (USGS) wells. The remaining ten wells are listed as water wells on the 

California Wells database. Potable water is supplied by City of Fresno public water supply wells, 

and base personnel have indicated that there is a city pump station located adjacent to the eastern 

facility property line approximately 50 ft away. PFAS sampling from one of two drinking water wells 

at this adjacent city pump station was conducted in June 2019. Perfluorohexane sulfonic acid 

(PFHxS), PFOS, and PFOA were detected at 0.93, 6.1, and 1.0 nanograms per liter, respectively. 

The sampling data is included in 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 lifetime Health Advisories within 20 miles of the facility.

According to well database entries in the EDR report, groundwater depth readings taken in 1963 

ranged from 54.56 to 73.85 ft bgs in six USGS wells. However, groundwater levels have since 

declined due to extensive regional pumping and are estimated at a depth greater than 80 ft bgs 

(ERM-West, Inc. 1998). Based on this historical information, the groundwater flow direction is 

inferred to be primarily east. Groundwater features are presented on Figure 1-2. 

Groundwater was measured in a 2018 Site Inspection (SI) at the adjacent Fresno Air National 

Guard Base (ANGB), located approximately 1.3 miles southeast of Fresno TASMG. Depth to 

groundwater ranged from 111 to 120 ft bgs, and the groundwater flow direction was northwest 

(AECOM, 2019). 

Hydrology

Fresno TASMG lies within the Mill Ditch Watershed, and overland surface flow from Fresno 

TASMG runs southwest and joins the Fresno Yosemite International Airport drainage system. This 

drainage system then flows south into Mills Creek (canal along McKinley Avenue) and feeds into 

Herndon Canal. The Herndon Canal is a tributary to the San Joaquin River, which eventually 

discharges into the San Francisco Bay (HazCon, 2017).

Storm water is drained radially outwards in the facility airfield and is captured in the storm drains 

located around the airfield boundary. The storm drainage system on the western side of the 

TASMG facility has a gate valve that can be manually shut to control the release of storm water. 

The facility has no water treatment system, and the two oil water separators associated with the 

Wash Rack and Corrosion Control Facility are connected to the Fresno sanitary sewer system. 

Surface water features are presented on Figure 1-3. 

Climate

Fresno TASMG is in a semi-arid, Mediterranean climate zone characterized by warm, dry weather 

from June through September, and mild, rainy weather from November through March. The 

average annual rainfall is approximately 11.5 inches, with the majority of the rainfall occurring 

between late fall and early spring. Summer temperatures peak in July and August, with an 

average temperature of 82.3 degrees Fahrenheit (°F), and winter temperatures are lowest in 

December to January, with an average temperature of 46.7 °F. Snowfall is rare, but frost occurs 

occasionally (National Oceanic and Atmospheric Administration [NOAA], 2019). 
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Fresno TASMG, California

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Current and Future Land Use

Fresno TASMG serves as a maintenance shop for rotary wing aircraft. The TASMG includes four 

main buildings (hangar, armory, ground support equipment building, and corrosion control facility)

and related infrastructure including roadways, parking lots, aircraft parking areas, and taxi lanes. 

The facility is categorized as a large-quantify hazardous waste generator because it houses 

several oil storage locations and manages a variety of hazardous materials (HAZMAT). The facility 

operates 10 hours per day from Monday through Friday and employs approximately 230 

personnel (HazCon, 2017). The current lease with the city of Fresno Airport Authority is set to 

expire in 2058 (White, T., 2019). Reasonably anticipated future land use is not expected to change 

from the current land use described above. 
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Facility Location

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

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

0 0.5 1 2

Miles

^_

Legend

Facility Boundary

Fresno TASMG

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Legend

Facility Boundary

Water Body

River/Stream

Canal/Ditch

Pipeline

Inferred Groundwater Flow

Direction

Geology

Marine and nonmarine

(continental) sedimentary

rocks

Quaternary Deposits,

Older Alluvium

Fault

Wells

!C( Municipal Well

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Groundwater Features

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 0.25 0.5 1

Miles

10
Mills Creek

Lower Dry

Creek

Watershed

Mill Ditch

Watershed

Legend

Facility Boundary

Water Body

Canal/Ditch

Surface Water Flow

Direction

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12420 Milestone Center Drive

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Surface Water Features

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 750 1,500 3,000

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PFAS Preliminary Assessment Report

Fresno TASMG, California

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2. Fire Training Areas

Two former FTAs were identified through record reviews and site visit interviews during the PA. A 

description and the location of the FTAs are shown on Figure 2-1. PA interview and VSI 

documents and photographs are included in Appendix B and Appendix C, respectively.

Interviewees had direct knowledge of ARNG operations covering the span of 1987 to present.

2.1 Wash Rack

The wash rack area is located at geographic coordinates 36°46’04.9”N; 119°43’07.6”W and is 

comprised of approximately 0.35 acres. A HAZMAT locker is located on the southeast corner of 

the wash rack. During the PA site visit, three 5-gallon AFFF canisters of the brand FireAde 3% 

AFFF Liquid Foam Concentrate were observed in the HAZMAT locker. 

According to interviews with site personnel, an unknown number of Tri-MaxTM 30 fire extinguishers 

were serviced with AFFF in the wash rack area. During the servicing, the Tri-MaxTM fire 

extinguisher would be discharged. Training sessions where personnel would familiarize 

themselves with discharging the Tri-MaxTM fire extinguishers, also referred to as “familiarization 

training”, were additionally conducted in the wash rack area. These events were estimated to 

occur periodically during the years 2007 to 2010. The volume of AFFF used during these events 

is unknown. Presumably, approximately three 5-gallon canisters of 3% AFFF were used 

collectively throughout the years, as six 5-gallon canisters of AFFF were originally procured, and 

three 5-gallon canisters now remain in the HAZMAT locker. There is no inventory or procurement 

system to track AFFF usage. 

The drains in the wash rack area lead to an oil water separator, which then flows into the Fresno 

sanitary sewer. However, according to information gathered during the interview, site personnel 

were instructed to plug the drains in the wash rack area whenever the Tri-MaxTM fire extinguishers 

were sprayed. The AFFF would be then left in place to evaporate or disperse in the wind.

Familiarization training may have also been conducted in this area prior to 2007. However, the 

training would have most likely involved the usage of dishwashing soap as opposed to AFFF. The 

original Tri-MaxTM fire extinguishers were reportedly filled with dishwashing soap and were 

replaced with newer AFFF-containing Tri-MaxTM fire extinguishers in approximately 2007 to 2008. 

2.2 Hangar Training Area

The pavement area outside the TASMG Hangar, located at geographic coordinates 36°47’07.3”N;

119°43’12.5”W, was the site of fire training exercises. According to site personnel, the exercises 

involved extinguishing active fire, which resulted from the ignition of fuel that was collected in a 

pan. The training exercises were conducted annually from approximately 2008 to 2011 and once 

in 2014. Tri-MaxTM fire extinguishers containing 3% AFFF were used in the exercises. Presumably, 

approximately three 5-gallon canisters of 3% AFFF were used collectively throughout the years, 

as six 5-gallon canisters of AFFF were originally procured, and three 5-gallon canisters now

remain in the HAZMAT locker. There is no inventory or procurement system to track AFFF usage. 

Familiarization training may have also been conducted in this area prior to 2008; however, the 

training would have most likely involved the usage of dishwashing soap as opposed to AFFF. The 

original Tri-MaxTM fire extinguishers were reportedly filled with dishwashing soap and were 

replaced with newer AFFF-containing Tri-MaxTM fire extinguishers in approximately 2007 to 2008. 
Wash Rack

Hangar

Training Area

Legend

Potential PFAS Release

Facility Boundary

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12420 Milestone Center Drive

Germantown, MD 20876

Fire Training Areas

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 150 300 600

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PFAS Preliminary Assessment Report

Fresno TASMG, California

14

3. Non-Fire Training Areas

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

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

3.1 East Airfield Taxiway

According to an interview with the mechanic supervisor responsible for maintaining the Tri-MaxTM

fire extinguishers, six Tri-MaxTM 30 fire extinguishers were serviced in the taxiway east of the 

airfield near the perimeter fence. Two areas were identified with geographic coordinates 

36°47’05.9”N; 119°43’07.2”W and 36°47’04.7”N; 119°43’06.5”W.

During the servicing, the Tri-MaxTM fire extinguisher was discharged onto the taxiway at the two 

locations. The AFFF was then left in place to evaporate or disperse in the wind. This servicing 

occurred in 2015 after the previous servicing on the extinguishers had expired. No more than 30-

gallons (the capacity of the Tri-MaxTM 30 fire extinguisher) of 3% AFFF mixture was discharged for 

each extinguisher serviced.

Tri-MaxTM fire extinguishers were observed stationed in various places around the airfield during 

the VSI. According to the aircraft maintenance supervisor, four Tri-MaxTM fire extinguishers remain 

charged with AFFF, and the remaining two extinguishers are not in service. 

3.2 Corrosion Control Facility

The corrosion control facility, also known as the paint shop facility, is located south of the airfield. 

The facility contains an AFFF fire suppression system and houses operations for large-scale 

painting, paint stripping, and paint storage. The corrosion control facility’s geographic coordinates 

are 36°46’59.8”N; 119°43’11.8”W.

The AFFF fire suppression system was installed in June 2011. The deluge system is located on 

the upper level on the southeastern side of the building. The AFFF tank has a 1,100-gallon 

capacity and contains 3% AFFF, manufactured by Chemguard, Inc. The facility also contains a 

waterfall paint spray booth, a patio area for paint stripping, and a strip rack. A large floor drain is 

located in the paint booth, but it is unknown whether the drain leads to the sanitary sewer system 

or storm drain system (Ayerza, 1999). 

Site personnel with first-hand knowledge did not recall any accidental release of AFFF since the 

time of installation; however, it was reported that there was a small drip leak at one of the pumps 

approximately six to eight months after the AFFF fire suppression system was installed. The leak 

was fixed and cleaned by an outside contractor approximately one week after the incident was 

reported. This leak is not considered to be a significant PFAS release. 

3.3 AVCRAD Hangar

The AVCRAD Hangar is located near the northern facility gate. The hangar maintains several 

rotary-wing aircraft and houses various related maintenance shops, offices, and supply rooms. 

The hangar’s geographic coordinates are 36°47’09.3”N; 119°43’10.3”W.

The hangar was toured during the VSI and was not found to have any storage of AFFF or contain 

a fire suppression system. The building is equipped with ABC fire extinguishers. According to 

interviews with CAARNG, AFFF has not been stored or used historically at the hangar. 
AVCRAD Hangar

Corrosion

Control Facility

East Airfield

Taxiway

Legend

Potential PFAS Release

No Suspected Release

Facility Boundary

Canal/Ditch

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12420 Milestone Center Drive

Germantown, MD 20876

Non-Fire Training Areas

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 150 300 600

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15
PFAS Preliminary Assessment Report

Fresno TASMG, California

16

4. Emergency Response Areas

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

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

identified within the current TASMG facility during the PA through interviews or EDR Reports. The 

CAARNG Maintenance Officer’s knowledge extends to 33 years but includes timeline gaps due 

to years of active military service. Information was also corroborated by an interview with Fresno 

ARFF Captain, whose tenure is 19 years. Aircraft emergencies are responded to by the Fresno 

ARFF unit (also referred to as “the Airport Crash/Fire/Rescue Division”) stationed at the Fresno 

Yosemite International Airport, and all other emergency services are provided by the municipal 

fire department. A mutual aid agreement for providing fire protection also exists between the 

Fresno ARFF and the Fresno Air National Guard Fire Department and is included in Appendix 

A.
PFAS Preliminary Assessment Report

Fresno TASMG, California

17

5. Adjacent Sources

Numerous potential off-facility sources of PFAS adjacent to the TASMG, not under the control of 

the CAARNG, were identified during the PA. A description of each adjacent source is presented 

below, and the adjacent sources are shown on Figure 5-1.

5.1 Fresno Air National Guard Base

Fresno ANGB is located on a 111-acre leased property on the southeast corner of the Fresno 

Yosemite International Airport. Fresno ANGB is home to the 144th Fighter Wing, and operations 

related to the use and/or storage of AFFF have historically occurred at various locations at Fresno 

ANGB. A 2016 PA report on PFAS identified nine potential release locations (PRLs) (BB&E, Inc. 

2016). A 2018 SI report for the Fresno ANGB confirmed that PFOS concentrations in soil at one 

PRL exceeded the USEPA residential soil regional screening level (RSL), and PFOA 

concentrations in groundwater at three PRLs exceeded the Health Advisories (AECOM, 2019). 

The Fresno ANGB PFAS investigation reports are included in Appendix B. A mutual aid 

agreement for fire protection and fire training services between the Fresno Air National Guard Fire 

Department, and the Fresno ARFF is included in Appendix A.

5.2 Fresno ARFF

The Fresno ARFF has a fire station on Fresno Yosemite International Airport property and 

provides emergency response to aircraft emergencies. The fire station stores 3% AFFF and 

contains a firetruck with a 500-gallon AFFF and 3000-gallon water capacity with proportioning 

valves to mix the concentrate with water. Nozzle testing with water regularly occurs in all areas of 

the airport property. In addition, the ARFF conducts bi-annual foam testing for Federal Aviation 

Administration (FAA) certification. Approximately 30-50 gallons of 3% AFFF in the concentrated 

form are released from the firetruck during each testing event. Three testing areas were identified 

during interviews with ARFF personnel. One testing area was outside the ARFF fire station, and 

the other two areas were located southeast of the TASMG at geographic coordinates 

36°46’49.8”N; 119°42’57.2”W and 36°46’40.6”N; 119°42’42.9”W. 

5.3 Former Fire Training Area #1

A former FTA is located on Fresno Yosemite International Airport property at approximate 

geographic coordinates 36°46’43.1”N; 119°42’55.4”W. According to interviews with Fresno ARFF 

personnel, the FTA was utilized by both the ANGB and ARFF in combined annual training events 

during the estimated years of 1989 to 2000. The FTA contained a mock-up aircraft in a lined fire

pit with a fuel pumping system. Training reportedly consisted of igniting fuel within the fire pit or in 

the mock-up aircraft and then extinguishing the resulting fire with AFFF. The frequency, volume, 

and concentration of AFFF used in this FTA are unknown. 

5.4 Former Fire Training Area #2

A former FTA is located on Fresno Yosemite International Airport property at approximate 

geographic coordinates 36°46’07.6”N; 119°42’49.6”W. According to interviews with Fresno ARFF 

personnel, the FTA was utilized by both the ANGB and ARFF in combined annual training events 

during the estimated years of 2005 to 2008. The FTA contained an old city of Fresno bus that 

would be ignited with fuel and then extinguished with AFFF. The frequency, volume, and 

concentration of AFFF used in this FTA are unknown. 
PFAS Preliminary Assessment Report

Fresno TASMG, California

18

5.5 Private Aviation Companies at Fresno Yosemite International 

Airport

Signature Flight Support Corporation maintains two hangars with AFFF deluge systems on a 

parcel of land adjacent to R-11 Runway. One hangar is a Signature TECHNICAir aircraft 

maintenance facility at address 4885 East Shields Avenue, and the other hangar is the Signature 

Fixed Base Operator (FBO) at address 3050 North Winery Avenue. On 16 October 2015, it was 

reported by ARFF personnel that the AFFF deluge system at the Signature FBO hangar had an 

accidental trip, which resulted in a release of AFFF. The ARFF personnel stated there was no

AFFF release from the TECHNICAir facility. 

SkyWest Airlines maintains a hangar on a parcel of land adjacent to R-29 Runway. The hangar 

contains an AFFF deluge system. During an interview with the Fresno ARFF Captain, a call by 

the Captain was made to the facility manager of the SkyWest hangar, and it was confirmed that 

there were no leakage or trips of the AFFF deluge system. A record of this conversation is provided 

in Appendix B. 

Rogers Helicopters, Inc. maintains a hangar on a parcel of land adjacent to R-29 Runway at 

address 5484 East Perimeter Road. Rogers Helicopters, Inc. is a private helicopter operator and 

provides helicopter charter services, maintenance, and logistical support. It is unknown whether 

AFFF is used at the Rogers Helicopters, Inc. facility, or if emergency responses using AFFF have 

occurred at the location. 

5.6 California Department of Forestry and Fire Protection

The California Department of Forestry and Fire Protection (CAL FIRE) maintains a hangar on a 

parcel of land adjacent to R-29 Runway. Fresno ARFF staff indicated during the interview that the 

hangar uses Phos-Chek fire retardants (non-AFFF). 

5.7 California Highway Patrol Aviation Facility

The California Highway Patrol Aviation Facility is located at 3770 North Pierce Avenue (adjacent 

to L-11 Runway). Fresno ARFF indicated during the interview that the facility does not contain an 

AFFF deluge system.

5.8 Former Marine Corps Facility

According to interviews with Fresno ARFF personnel, there was a former Marine Corp facility

located approximately 0.5 miles southeast of the TASMG. The facility housed a Light Anti-Aircraft 

Missile Battalion, a United States Marine Corps air defense unit, and had a deployable fire unit 

with a P-19 firetruck. The current Fresno ARFF fire captain and former guardsman recounted that 

combined fire training was conducted with the Air National Guard in the area during the estimated 

years of 1990-1992. The Marine Corps leased the property from the Fresno Yosemite 

International Airport until approximately five years ago. A search on the Naval Facilities 

Engineering Command administrative record was made, but no information was readily available.

Based on the timeline and operational use, it is possible AFFF could have been released or used 

during fire training exercises. 

5.9 Aramark Uniform Services

An Aramark Uniform Services facility is located at 3333 North Sabre Drive, Fresno, California 

93727. The facility provides uniform-related services such as uniform cleaning and fire-resistant 
PFAS Preliminary Assessment Report

Fresno TASMG, California

19

workwear. According to interviews with TASMG personnel, the facility has a large groundwater 

release. PFAS contamination from these industrial applications is unknown but possible. 

5.10 1994 Learjet Crash

On December 14, 1994, a Learjet on a military training exercise with the Air National Guard 

crashed into Olivewood Apartments at the intersection of Olive Avenue and Recreation Avenue. 

The location is approximately two miles southwest of the Fresno Yosemite International Airport. 

City of Fresno firefighters and paramedics, FAA investigators, and military men were present at 

the scene. According to one first responder account, “the flames were 20 feet high for at least two 

blocks” (Harrison, 2014). An article from a past issue of The Los Angeles Times recounted that 

“flame retardant foam was everywhere” (Arax, 1994). The quantity and type of foam (Class A or 

AFFF) used in the emergency response is unknown. 
Rogers Helicopters, Inc

California Highway

Patrol Aviation Facility

CAL Fire

Facility

SkyWest

Airlines Hangar

Signature

TECHNICAir Facility

ARFF Test

Foam Area

ARFF Fire Station

and Test Foam Area

Former Fire

Training Area #1

ARFF Test

Foam Area

Former Marine

Corps Facility

Former Fire

Training Area #2

Signature Fixed Based

Operator Hangar

Aramark Uniform

Services

1994 Learjet

Crash

Fresno Air National

Guard Base

Legend

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

River/Stream

Canal/Ditch

Pipeline

CLIENT

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ARNG

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4/30/2019

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NOTES Preliminary Assessment for PFAS at Fresno TASMG, CA

1:24,000

4/30/2019 ­ Figure 5-1 PM RG 4/30/2019

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12420 Milestone Center Drive

Germantown, MD 20876

Adjacent Sources

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 1,000 2,000 4,000

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20
PFAS Preliminary Assessment Report

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21

6. Conceptual Site Model

Based on the PA findings, there were two areas where fire training occurred and two areas where 

AFFF may have been incidentally spilled to the ground surface. As such, these AOIs may be 

potential PFAS source areas. The AOIs and CSM for the AOIs are shown on Figure 6-1 and 

Figure 6-2, respectively, and summarized below.

Although the use of AFFF could not be confirmed, the following AOIs were identified that could be

PFAS source areas:

• AOI 1 – Hangar Training Area

• AOI 2 – Wash Rack and East Airfield Taxiway

The following sections describe the CSM components and the specific CSMs developed for each 

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. Dermal contact 

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

absorption of PFAS through the skin (National Ground Water Association, 2018). Receptors for 

Fresno TASMG include site workers, construction workers residents, recreational users, and 

trespassers. Groundwater is too deep in the region for direct exposure; however, it is used as 

water supply. The CSMs for each AOI indicate which specific receptors could potentially be 

exposed to PFAS. 

6.1 AOI 1: Hangar Training Area 

AOI 1 is the Hangar Training Area, which borders the TASMG Hangar to the west. Controlled 

AFFF releases through fire training activities occurred annually during the approximate years 

2008 to 2011 and 2014.

AOI 1 lies within the San Joaquin Valley Groundwater Basin, and all surface water is eventually 

drained by tributaries to the San Joaquin River. PFAS are water soluble and can migrate readily 

from soil to groundwater or surface water via leaching and run-off. If PFAS releases to surface 

and subsurface soil occurred, it is possible that PFAS migrated from surface soil at AOI 1 to 

groundwater and waters in the San Joaquin River. Drinking water is supplied by city of Fresno 

water supply wells. The closest city pump station was indicated to lie adjacent to the eastern 

facility property line, approximately 50 feet away and in the inferred downgradient groundwater 

flow path from the AOI. In addition, precipitation infiltrating into the grassy surrounding areas of 

the AOI may cause the migration of PFAS from surface and subsurface soil to groundwater and 

surface water. 

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

to potential PFAS contamination via inhalation of dust or ingestion of surface soil. Grounddisturbing activities to subsurface soil could result in construction worker exposure via ingestion 

or inhalation of subsurface soil. Off-facility recreational users and residents may be exposed to 

inhalation of dust caused by on-facility ground disturbing activities, although this exposure is likely 

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

potentially complete. 

One of the two drinking water wells at the adjacent city pump station was sampled in June 2019, 

and PFOS and PFOA were detected below the Health Advisories. The city pump station supplies 

water for the facility and residents; therefore, the exposure pathway for groundwater is considered 
PFAS Preliminary Assessment Report

Fresno TASMG, California

22

potentially complete for site workers and residents. Site workers, construction workers, and 

trespassers at the facility may be exposed to PFAS via ingestion of surface water and sediment 

in the San Joaquin River and its tributaries. Similarly, residents and recreational users may be 

exposed to PFAS in surface water and sediment off-facility. The preliminary CSM for AOI 1 is 

shown on Figure 6-2.

6.2 AOI 2: Wash Rack and East Airfield Taxiway

AOI 2 is the Wash Rack and East Airfield Taxiway. The area includes the HAZMAT locker with 

AFFF storage, located at the southeast corner of the Wash Rack. Controlled AFFF releases to 

the Wash Rack have occurred periodically from 2007 to 2010, and AFFF releases in the two 

identified areas from the servicing of Tri-MaxTM fire extinguishers in the East Airfield Taxiway have 

occurred in 2015. 

The Wash Rack contains an oil water separator that drains to the Fresno sanitary sewer. However, 

base personnel have indicated that the wash rack drains were typically plugged during training 

events. Therefore, all potentially contaminated surface water at AOI 2 would have been captured 

in surrounding storm drains, which carry water towards Mills Creek and eventually to San Joaquin

River. If PFAS were released to surface soil at AOI 2, they would have potential to migrate from 

surface soil to surface water via run-off and to groundwater via leaching. The nearest water supply

well to AOI 2 is east of the AOI, approximately 50 feet away. With inferred groundwater flow to the 

east, the water supply well is potentially downgradient of the AOI. The pathways and receptors 

for AOI 2 are the same as described in Section 6.1. The preliminary CSM for AOI 2 is shown on 

Figure 6-2.
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Rogers Helicopters, Inc

ARFF Test

Foam Area

ARFF Fire Station

and Test Foam Area

Former Fire

Training Area #1

Former Marine

Corps Facility

Former Fire

Training Area #2

Signature Fixed Based

Operator Hangar

Aramark Uniform

Services

1994 Learjet Crash

Fresno Air National

Guard Base

California Highway Patrol 

Aviation Facility

CAL Fire Facility

SkyWest Airlines Hangar

Signature 

TECHNICAir 

Facility

Lower Dry

Creek

Watershed

Mill Ditch

Watershed

0 850 1,700 3,400

Feet

!C(!C(

East Airfield Taxiway

Wash Rack

Hangar Training Area

AVCRAD Hangar

Corrosion Control Facility

Mill Ditch

Watershed

AOI 2

AOI 1

­ Figure 6-1

CLIENT

REVISED

SCALE

PROJECT

ARNG

Preliminary Assessment for PFAS at Fresno, TASMG

6/3/2019

6/3/2019

6/3/2019

MS

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GIS BY

CHK BY

PM

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

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

6/3/2019

1:20,400

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\CA\Fresno_TASMG\Fig_6-1_Fresno_TASMG_AOIs.mxd

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Water Body

Canal/Ditch

Inferred Groundwater Flow

Direction

Surface Water Flow Direction

!C( Municipal Well

Areas of Interest

12420 Milestone Center Drive

Germantown, MD 20876

0 137.5 275 550

Feet

23
Media

SOURCE PATHWAY RECEPTOR

AOI 1

AOI 2

Fire Training and 

Mobile Fire 

Extinguishers 

Discharge

PFAS in 

surface soil

Human 

activities

Precipitation/ 

run-off

Leaching/ 

infiltration

Airborne soil 

particulate

Surface soil 

at AOI

Surface 

water/ 

sediment

Subsurface 

soil

Shallow 

groundwater

Source Release 

Mechanism Media Transport and Migration Media Exposure Routes

Inhalation of 

dust

Ingestion

Ingestion

Ingestion

Ingestion

Human Receptors: 

Current/ Future

Flow-chart continues

Partial/ possible flow

Flow-chart stops

Incomplete pathway

Possible complete pathway

Complete pathway

/ /

Site 

Worker

Construction 

Worker Resident Trespasser/ Recreational User

Site 

Worker

Construction 

Worker Resident

/ / / /

/ / / /

/ / / /

/ / / /

LEGEND

Figure 6-2

Preliminary Conceptual Site Model

Fresno TASMG, CA

Potential 

Off-Facility 

Source Not 

under 

Control of 

ARNG

Trespasser/ 

Recreational User

1. The resident receptor refers to an off-site

resident.

2. Current risk practice suggests the exposure 

pathway for dermal contact is insignificant

compared to ingestion, but supporting data 

are sparse and continue to be studied. 

Notes:

/

24
PFAS Preliminary Assessment Report

Fresno TASMG, California

25

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 Fresno TASMG. The PA findings are based 

on the information presented in Appendix A and Appendix B.

7.1 Findings

Two AOIs related to potential PFAS release were identified (Table 7-1) at Fresno TASMG during 

the PA (Figure 7-1). 

Table 7-1: AOIs at Fresno TASMG

Area of Interest Name Used by Release Dates

AOI 1 Hangar Training 

Area CA ARNG Potentially as early as 2008

AOI 2

Wash Rack and 

East Airfield 

Taxiway

CA ARNG Potentially as 

early as 2007

The Corrosion Control Facility and AVCRAD Hangar at Fresno TASMG were determined to have 

no suspected PFAS release to the environment. The AVCRAD Hangar did not have any historical 

and current storage or use of AFFF. The Corrosion Control Facility contains an AFFF deluge 

system but did not have any accidental trips of the system since the time of operation (2011 to 

present). A drip leak at one of the system pipes occurred after installation but was fixed shortly 

after and cleaned from the facility. 

Numerous potential off-facility sources of PFAS were considered in the local area surrounding 

Fresno TASMG. These include:

• Fresno ANGB – a PFAS SI at the base has reported PFAS exceedances of the RSL for soil 

and health advisory limits for groundwater

• Fresno ARFF – stores AFFF at the fire station and uses AFFF in several areas of the Fresno 

Yosemite International Airport property for bi-annual FAA certification 

• Former FTAs – two former FTAs on Fresno Yosemite International Airport property were 

reportedly used by ARFF and ANGB and may have involved AFFF in training exercises

• Private Aviation Companies – Signature Flight Support Corporation, Inc. maintains two 

hangars with AFFF deluge systems, one of which had an accidental trip, and SkyWest Airlines 

also maintains a hangar with an AFFF deluge system

• Former Marine Corps Facility – reportedly had a fire unit with a P-19 firetruck and conducted 

fire training activities with Fresno ANGB, which may have involved AFFF usage

• Aramark Uniform Services – conducts industrial activities related to uniform manufacturing

and fireproofing, which may involve PFAS-containing chemicals

• 1994 Learjet Crash – in 1994, a Learjet crashed onto Olive Avenue approximately two miles 

southwest of the airport; an unknown quantity and type of foam was used in the incident 

response
PFAS Preliminary Assessment Report

Fresno TASMG, California

26

Based on information obtained during the PA at these AOIs, there is potential for exposure to 

PFAS contamination in media at or near the facility. The preliminary CSM for Fresno TASMG, 

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

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 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 was 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, retired and current personnel were interviewed, multiple persons were 

interviewed for the same potential source area, and potential source areas were visually 

inspected.

The following Table 7-2 summarizes the uncertainties associated with the PA.

Table 7-2: Uncertainties

Area of Interest Source of Uncertainty

AOI 1: Hangar Training 

Area

Dates of AFFF usage are estimated and cannot be confirmed by 

written documentation. It is unknown what familiarization training 

may have occurred prior to 2007/2008; however, it is speculated 

that any training would have been conducted with dishwashing 

soap as opposed to AFFF, which was first procured in 

2007/2008. 

AOI 2: Wash Rack and 

East Airfield Taxiway

The volume of AFFF used during fire training in the wash rack 

area is unknown. Dates of AFFF usage are estimated and cannot 

be confirmed by written documentation. It is unknown what 

familiarization training may have occurred prior to 2007/2008; 

however, it is speculated that any training would have been 

conducted with dishwashing soap as opposed to AFFF, which 

was first procured in 2007/2008. 

General Some facility operations are not well defined given the limitation 

of interviewee knowledge. CAARNG Maintenance Officer’s

knowledge extends to 33 years but includes timeline gaps due 

to years of active military service.
PFAS Preliminary Assessment Report

Fresno TASMG, California

27

7.3 Potential Future Actions

Based on the documented absence (2011 to present) of the use or release of AFFF from the 

deluge system in the Corrosion Control Facility, evidence does not indicate that current or former 

ARNG activities having contributed PFAS contamination to soil, groundwater, surface water, or 

sediment. 

Interviews and records (covering 1987 to present) indicate that current or former ARNG activities 

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

potential releases occurred after Fresno TASMG received newly commissioned Tri-Max fire 

extinguishers that were subsequently filled with AFFF in approximately 2007 to 2008. Based on 

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

contamination in soil, groundwater, surface water, and sediment at these AOIs. Table 7-3

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

investigation under the CERCLA process and undergo an SI. 

Table 7-3: PA Findings Summary

Area of Interest AOI Location Rationale Potential 

Future Action

AOI 1: Hangar 

Training Area

36°47’07.3”N; 

119°43’12.5”W

Confirmed usage of AFFF during 

annual training exercises by 

interviewee with direct 

knowledge

Proceed to an 

SI, focus on 

soil, 

groundwater, 

surface water, 

sediment

AOI 2: Wash Rack 

and East Airfield 

Taxiway 

36°47'05.9”N; 

119°43'07.2"W

Confirmed usage of AFFF during 

periodic fire training exercises in 

the wash rack and from servicing 

of Tri-Max fire extinguishers; 

interviewees had direct 

knowledge of these occurrences

Proceed to an 

SI, focus on 

soil, 

groundwater, 

surface water, 

sediment

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

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

California Highway Patrol Aviation Facility

CAL Fire Facility

SkyWest Airlines Hangar

Signature TECHNICAir Facility ARFF Test

Foam Area

ARFF Fire Station

and Test Foam Area

Former Fire

Training Area #1

ARFF Test Foam Area Former Marine

Corps Facility

Former Fire

Training Area #2

Signature Fixed Based

Operator Hangar

Aramark Uniform

Services

1994 Learjet

Crash

Fresno Air National

Guard Base

AVCRAD Hangar

Corrosion Control Facility

East Airfield Taxiway

Wash Rack Hangar Training Area

AOI 2

AOI 1

Legend

Area of Interest

Potential PFAS Release

No Suspected Release

Facility Boundary

Canal/Ditch

CLIENT

REVISED

SCALE

ARNG

GIS BY

CHK BY

MS

ST

4/30/2019

4/30/2019

NOTES Preliminary Assessment for PFAS at Fresno TASMG, CA

1:6,000

4/30/2019 ­ Figure 7-1 PM RG 4/30/2019

Q:\Projects\ENV\GEARS\GEO\ARNG PFAS\900-CAD-GIS\920-GIS or Graphics\MXD\CA\Fresno_TASMG\Fig_7-1_Fresno_TASMG_Summary.mxd

12420 Milestone Center Drive

Germantown, MD 20876

Summary of Findings

Base Map: Source: Esri, DigitalGlobe, GeoEye,

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

0 250 500 1,000

Feet

0 1,300 2,600 5,200

Feet

28
PFAS Preliminary Assessment Report

Fresno TASMG, California

29

References

AECOM, 2019. Final Site Inspection Report, Air National Guard Phase II Regional Site 

Inspections for Per- and Polyfluoroalkyl Substances, Fresno Air National Guard Base, Fresno, 

California. March 2019. 

Arax, Mark. “At Least 3 Killed as Plane Crashes on Fresno Street: Accident: Learjet has engine 

trouble while returning to airport. It slams into apartment complex, creating grim scene of 

destruction.” Los Angeles Times. 15 December 1994. 

Ayerza, 1999. Conversation between Gene Ayerza (Lear Siegler Services Inc.) and Dina 

Calanchini (Radian International). 2 March.

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

144th Fighter Wing, California Air National Guard, Fresno Yosemite International Airport, 

Fresno, California. May 2016. 

ERM-West, Inc. 1998. Final Well 70 Interim Action Ground Water Monitoring Program Sampling 

and Analysis Plan, Old Hammer Air Field, Fresno, California. January 1998.

Harrison, Liz. “December marks 20th anniversary of Learjet crash in Fresno.” ABC 30 Action 

News. 26 November 2014. 

HazCon, 2017. Spill Prevention, Control, and Countermeasure Plan, 1106th Theather Aviation 

Sustainment Maintenance Group (TASMG), 5168 East Dakota Avenue, Fresno, Califronia 

93727. April 2017. 

Leedshill-Herkenhoff Inc., 1990. Phase 1 Preliminary Site Assessment for the California National

Guard Aviation Classification Repair Activity Depot. February.

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

Practice. January 2018.

National Oceanic and Atmospheric Administration. 2019. Fresno Normals, Means & Extremes. 

https://www.weather.gov/hnx/fatmain (Accessed April 2019). 

Page, R.W., and LeBlanc, R.A., 1969. Geology, Hydrology, and Water Quality in the Fresno Area, 

California. U.S. Geological Survey Open File Report 69-328. 

Radian International. 1999. California Army National Guard Preliminary Assessment for California 

Aviation Classification Repair Activity Depot, Fresno, California. Delivery Order 0086, Contract 

Number DACA01-95-D-0015. October 1999. 

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

Preliminary Assessments under CERCLA. EPA/540/G-91/013. September 1991. 

White, Thomas (CA ARNG Real Estate Manager). “Re: CA ARNG Leasing Documents” Message 

to Stephanie Tjan. 2019. E-mail. 
PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix A 

Data Resources
PFAS Preliminary Assessment Report 

Fresno TASMG, California

Data resources will be provided separately on CD. Data resources for Fresno TASMG include: 

Environmental Data Resources, Inc. Geocheck Report

• 2019 Environmental Data Resources, Inc. Geocheck Report for Fresno TASMG, CA

CAARNG Leasing Information

• 2019 CA ARNG Leasing Documents E-mail from Tom White (CAARNG Real Estate

Manager) to Stephanie Tjan (AECOM)

CA Water Board GAMA Groundwater Information System

• Well 306 Drinking Water Analytical Data

• King-22 Well Drinking Water Analytical Data

Material Safety Data Sheets

• 2006 Material Safety Data Sheet – Chemguard 3% AFFF C-301MS

• 2018 Safety Data Sheet – Fire Service Plus, Inc. FireAde Fire Fighting Agent

Previous Investigations

• 1999 Final California Army National Guard Preliminary Assessment for California Aviation

Classification Repair Activity Depot, Fresno, California

Miscellaneous Data Resources

• 1983 Reciprocal Fire Protection Agreement

• 2016 Final Perfluorinated Compounds Preliminary Assessment Site Visit Report, 144th

Fighter Wing California Air National Guard, Fresno Yosemite International Airport, Fresno

California

• 2017 Spill Prevention, Control, and Countermeasure Plan, 1106th Theater Aviation

Sustainment Maintenance Group (TASMG), 5168 East Dakota Avenue, Fresno, CA 93727

• 2019 Final Site Inspection Report, Air National Guard Phase II Regional Site Inspections for

Per- and Polyfluoroalkyl Substances, Fresno Air National Guard Base, Fresno, California
PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix B 

Preliminary Assessment Documentation
PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix B.1 

Interview Records
PA Interview Questionnaire - Other Facility:__Fresno TASMG____

Interviewer:___ST___________

Date/Time:___3/7/19_________

Interviewee:___ ______________________ 

Title:____unknown________________________

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:

unknown

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?

Does not recall false trip or foam testing at AFFF deluge system.

Foam leaked 6-8 months after it was installed, but it was just a drip leak at the tank.

Refill Tri-Maxes at wash rack with minimal spills.

Mockup aircraft at FTA was welded steel mockup that looked like jet aircraft. 
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

Interviewee:__multiple (see below)________

Title:__________________________________ 

Phone Number:_________________________

Email:_______________________________

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

Can you recommend anyone we can interview?

Y or N __________________________

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

– was here when they first issued Tri-Max, worked on flightline and serviced Tri-Max, mechanic 

and technical inspector, at facility for 33 years

– started 2003, flights ops and technical inspector

– started 2003, maintained Tri-Maxes that were serviced once a year, aircraft electrician, quality 

manager representative and fire marshall

– at facility for 2 years 

2. Where can I find previous facility ownership information?

AVCRAD and armory were built in 1996, the perimeter has been the same

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

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

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

Maintenance said he were perform maintenance events where he serviced Tri-Max 

and sprayed

Fire Training Areas ~annually, training on flightline, often trained with soap

Firefighting (Active Fire) they have no fire truck, in event of real fire they would have also used 

soap 

Crash never on facility, Air Guard crash on Belmont Ave. near school and Chestnut and Olive 

intersection that was responded by municipal fire department

Fire Suppression Systems (Hangers/Dining Facilities) Paint shop AFFF deluge system

Fire Protection at Fueling Stations

Non-Technical/Recreational/ Pest Management

Metals Plating Facility

Waterproofing Uniforms (Laundry Facilities)

Other

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

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

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

AFFF/suppression system? Do you have “As Built” drawings for the buildings?

Paint shop has AFFF deluge, was built in 2012 and serviced but never had any releases through testing 

or accidental trips.

They have an outside contractor and that comes and performs annual maintenance.
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

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

high expansion foam? If retrofitted, when was that done?

Paint shop is still charged with AFFF.

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

No inventory system, but throughout years 2008-2011, must have used three or four 5-gallon 

buckets of AFFF

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

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

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

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

material?

They had old Tri-Maxes that used dishwashing soap and air for familiarization training. After they got 

new Tri-Maxes (procured ~2007/2008), they started using AFFF. AFFF is stored in 5-gallon buckets. 

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

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

was conducted at them? 

1) Collective training – group would conduct familiarization training, annually from 2008-2011

2) Individual training, 2007-2010

3) Wash rack training, plugged drain, individual training, 2007-2010
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

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

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

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

Just let it evaporate

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

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

photographs to share with us?

Airport FD would use their own truck to spray with water on-post

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

at various areas.

No

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

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

No

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

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

the responder?

Just the Air Guard crash mentioned above.
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

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

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

landings to prevent fires?

No

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

happened and who was involved?

No

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

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

Municipal FD responds to emergencies. Aircraft emergencies are responded by ARFF. 

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

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

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

Currently there are only four charged Tri-Maxes. 

Other potential adjacent sources:

- Marine Corp facility nearby

- Air Guard had FTA with active fire training on aircraft mockup

- ANG facility nearby

- Skywest (commercial maintenance)

- Cal Highway Patrol

- Airmark have huge GW release

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

involved?

No
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

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

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

Natural Resources Management Plans?

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

record) and where can we find them?

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

of that chrome plating shop?

No

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

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

stored, mixed, applied, etc.?

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

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

the manifest or B/L?

Disposed of during training. Started with ~six 5-gallon buckets. 
PA Interview Questionnaire - Environmental Manager Facility:__Fresno TASMG___

Interviewer:__ST___________

Date/Time:__3/7/19_________

26. Do you recommend anyone else we can interview? If so, do you have contact information for them?
PA Interview Questionnaire - Other Facility:_Fresno TASMG_____

Interviewer:__ST____________

Date/Time:___3/7/19_________

Interviewee:__multiple (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:

Chief, Captain of Airport Public Safety, 19 years with airport but was part of the Air Guard before since 

1989

engineer, ARFF coordinator, 12 years at facility and coordinator for 7 years

City of Fresno FD, fire captain

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?

There’s two FDs (Air Guard and airport) and they always train together.

Cal Fire has phos check.

2005-2008, FTA on ANG property, did fire training on City of Fresno bus, combined training with Air 

Guard, active fire. 

FTA with mockup aircraft – had a fuel pumping system to a lined fire pit.

ARFF foam would runoff into surface drainage system and into city sewage. 

Signature building has an AFFF deluge system, there was a accidental trip on October 16, 2015. To get rid 

of all the foam, they sprayed water with a high pressure mist/nozzle.

Skywest maintenance has a deluge AFFF system but no trips (confirmed via call from Captain to Skywest 

facility).

Testing of foam –biannual for FAA certification, still occurring, last time was in November-January

They used 3% AFFF in the concentrated form, proportioners on fire truck.

They use 30-50 gallons of concentrated AFFF per testing event from fire truck. 

Fire truck has 500-gallon foam capacity ad 3000 water gallon capacity.

They perform nozzle testing with just water anywhere. 

AFFF is stored in 45-gallon totes and 5-gallon buckets. 

Marine Corps did have a P-19 and deployable unit, also trained with Air National Guard, Light Anti-
PA Interview Questionnaire - Other Facility:_Fresno TASMG_____

Interviewer:__ST____________

Date/Time:___3/7/19_________

Aircraft Missile Battery (or Battalion) (LAAMB 4th)

Marine Corps combined training in 1990-1992 (Capt. has knowledge)

Marine Corps closed shop ~ 5 years ago and property is now part of airport. 
PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix B.2 

Visual Site Inspection Checklists










PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix B.3 

Conceptual Site Model Information
Preliminary Assessment – Conceptual Site Model Information

Site Name: Fresno TASMG

Why has this location been identified as a site?

Facility has multiple sites containing operations to support maintenance and operation of aircraft. AFFF 

was used or stored at the facility.

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

Facility is near Fresno Yosemite International Airport, which contains numerous aviation industry tenants

that use unknown fire suppression techniques. Additionally, Fresno ARFF and Fresno ANGB operate 

facilities in the vicinity of the TASMG.

Training Events

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

If so, how often? Approximately once a year from 2008 – 2011 and 2014

How much material was used? Is it documented? No documentation but started with six/seven 5-gallon

containers of AFFF and now only three containers remain

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? Radially outwards in airfield or public airport

Average rainfall? 12.8 inches

Any flooding during rainy season? No

Direct or indirect pathway to ditches? Direct pathway to ditches 

Direct or indirect pathway to larger bodies of water? Storm water drains to Mills Creek and eventually to 

San Joaquin River

Does surface water pond any place on site? No

Any impoundment areas or retention ponds? No 

Any NPDES location points near the site? Yes, on western side of facility

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

Groundwater:

Groundwater flow direction? Assumed east

Depth to groundwater? Approximately 55 to 74 ft bgs

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

Any groundwater treatment systems? No

Any groundwater monitoring well locations near the site? Yes

Is groundwater used for drinking water? Yes

Are there drinking water supply wells on installation? No

Do they serve off-post populations? N/A

Are there off-post drinking water wells downgradient? Yes, approximately 50 ft east of facility boundary

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?

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?

Nozzles for Tri-max extinguishers are tested after servicing in the wash rack area and eastern airfield

taxiway. Flows to storm water drains. No cleaning. 

3. Other?
Preliminary Assessment – Conceptual Site Model Information

Identify Potential Receptors:

Site Worker - Yes

Construction Worker - Yes

Recreational User - Yes (potential off-facility user of San Joaquin River for recreation)

Residential - Yes (potential off-facility user of San Joaquin River for recreation)

Child Yes – Yes (potential off-facility user of San Joaquin River for recreation)

Ecological - Yes (eco receptors of Mills Creek or San Joaquin River)

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

Aviation industry tenants of Fresno Yosemite International Airport, residential communities to the north,

commercial areas to the northeast and east

Documentation

Ask for Engineering drawings (if applicable).

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

None known
PFAS Preliminary Assessment Report

Fresno TASMG, California

Appendix C 

Photographic Log
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Fresno TASMG Fresno, California

Preliminary Assessment Report

Fresno TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 1

Description:

Wash rack area and

HAZMAT locker with AFFF

storage; Tri-Max 30 mobile

fire extinguishers containing

AFFF were discharged in the

wash rack area

Orientation:

Northeast

Date 3/7/2019

Time 11:06

Photograph No. 2

Description:

Wash rack drains were

plugged whenever Tri-Max

fire extinguishers were

discharged in the wash rack

area

Orientation:

South

Date 3/7/2019

Time 11:08

AECOM Page 1 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Fresno TASMG Fresno, California

Preliminary Assessment Report

Fresno TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 3

Description:

Three 19-Liter (5-gallon)

canisters of FireAde 3%

AFFF Liquid Foam

Concentrate stored in the

HAZMAT locker

Orientation:

West

Date 3/7/2019

Time 11:09

Photograph No. 4

Description:

Taxiway east of airfield where

Tri-Max 30 fire extinguishers

containing AFFF were

serviced and then discharged

Orientation:

Southeast

Date 3/7/2019

Time 11:11

AECOM Page 2 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Fresno TASMG Fresno, California

Preliminary Assessment Report

Fresno TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 5

Description:

Tri-Max 30 fire extinguisher

containing 3% AFFF

concentrate; approximately

seven Tri-Max extinguishers

were observed on or

surrounding the airfield

Orientation:

South

Date 3/7/2019

Time 11:13

Photograph No. 6

Description:

1,100-gallon tank of 3%

AFFF by Chemguard, Inc. for

fire suppression system

contained in the upper deck

of the Corrosion Control

Facility

Orientation:

Southeast

Date 3/7/2019

Time 11:21

AECOM Page 3 of 4
Appendix C - Photographic Log

Army National Guard, Preliminary

Assessment for PFAS

Fresno TASMG Fresno, California

Preliminary Assessment Report

Fresno TASMG

Perfluorooctane-Sulfonic Acid (PFOS) and

Perfluorooctanoic Acid (PFOA) Impacted Sites

ARNG Installations, Nationwide

Photograph No. 7

Description:

TASMG personnel

demonstrates where collective

fire training exercises took

place outside the TASMG

Hangar

Orientation:

Southwest

Date 3/7/2019

Time 11:32

AECOM Page 4 of 4