0002 - Attachment 4 - Site Assessment Report - Fargo VA USTs - P-0040293.pdf

Geotechnical ● Materials Forensic ● Environmental

Building Technology Petrography/Chemistry

American Engineering Testing 2110 Lovett Avenue, Suite #5 Bismarck, ND 58504 teamAET.com • 800.792.6364

SITE ASSESSMENT REPORT

FourFront Design, Inc.

Fargo VA USTs 2101 Elm Street, Fargo, North Dakota

AET Project No. P-0040293

Date:

April 2, 2025

Prepared for:

517 7th Street Rapid City, South Dakota 57701

2110 Lovett Avenue, Suite #5 | Bismarck, ND 58504 Phone (701) 941-8573 | (800) 972-6364 | Fax (651) 659-1379 | teamAET.com | AA/EEO

This document shall not be reproduced, except in full, without written approval from American Engineering Testing, Inc.

April 2, 2024

517 7th Street Rapid City, SD 57701

Attn: Jared Lott, Project Manager Email: jared.lott@fourfrontdesign.com

Subject: Site Assessment Report FourFront Design, Inc.

Fargo VA USTs 2101 Elm Street, Fargo, ND 58102 AET Project No. P-0040293

Dear Mr. Lott:

American Engineering Testing, Incorporated (AET) has completed the Site Assessment Report (Report) at the above-referenced site per the AET Proposal dated February 4, 2025, as part of the authorized Professional Subconsultant Agreement dated February 10, 2025.

If you have any questions, comments, or need additional information, please feel welcome to contact us. AET appreciates the opportunity to work with you on this project.

Sincerely, American Engineering Testing

Taylor Roth Senior Project Manager troth@teamAET.com Office: (701) 941-8573 mailto:jared.lott@fourfrontdesign.com mailto:troth@teamAET.com

Site Assessment Report Fargo VA USTs, Fargo, North Dakota

TABLE OF CONTENTS

1.0 INTRODUCTION

1.1 Site Description

1.2 Background Information

1.3. Previous Studies

1.4 Site Topography

1.5 Geology and Hydrogeology

1.6 Purpose of Work

1.7 Scope of Work

2.0 PROJECT RESULTS

2.1 Surface Conditions

2.2 Subsurface Conditions

2.3 Soil Sample Screening Results

2.4 Soil Analytical Results

2.5 Groundwater Observations

2.6 Sensitive Receptors

2.7 Exposure Pathway Screening

2.7.1 Surface Water Protection Pathway

2.7.2 Groundwater Protection Pathway

2.7.3 Impacted Soil in Contact with Undergrounf Utilities

2.7.4 Soil Inhalation, Ingestion, and Dermal Contact

3.0 DISCUSSION and CONCLUSIONS

4.0 RECOMMENDATIONS

5.0 STANDARD OF CARE

APPENDICES

A. Figures

1. Site Location Topographic Map

2. Soil Boring Location Map

B. Methodologies C. Soil Boring Logs D. Laboratory Analytical Reports

SITE ASSESSMENT REPORT

FARGO VA USTs

FARGO, NORTH DAKOTA

AET PROJECT No. P-0040293

1.0 INTRODUCTION

1.1 Site Description

The Fargo VA USTs project site (Site) is located at 2102 Elm Street in Fargo, North

Dakota (ND). The environmental assessment area of the underground storage tanks

(USTs) at the Site are specifically located in the northeast corner of the property. The latitude/longitude of the assessment area is approximately 46.906957°, -96.773023°. The location of the Site is shown on the attached topographic map, labeled as Figure 1 located in Appendix A.

1.2 Background Information

Information obtained from FourFront Design, Inc. (FourFront or client) indicated the current UST systems are being replaced with new infrastructure. As part of the replacement process, an environmental assessment is required by the owner. The USTs being investigated consist of three 20,000-gallon fuel oil tanks (USTs 1-3) located in one tank basin; and two additional 4,000-gallon diesel tanks (USTs 4 and 8), each located in separate tank basins. Site background investigations indicate that impacted soil was discovered and completely removed in 1992 from the area around USTs 2 and 3 which are used for heating/fuel oil storage.

1.3. Previous Studies

Per the “Statement of Work” (SOW) document provided to AET prior to beginning the Site assessment: “Contaminated soil was discovered and completely removed from the premises in 1992 in the immediate area of construction for USTs 2 and 3.” AET has not been presented with any supporting documentation as it relates to the removal of impacted soil in this area as of the date this Report was written.

1.4 Site Topography

Review of the United States Geologic Survey topographic map, Fargo, ND Quadrangle indicates the elevation of the Site is approximately 906 feet above mean sea level. The surrounding topography of the Site dips to the east-southeast towards the Red River, which is located approximately 375 feet east of the Site (Figure 1).

1.5 Geology and Hydrogeology

The ND Geologic Map Viewer (Geologic Map Viewer | Department of Mineral Resources, North Dakota) indicates the Site lies over the Oahe Formation described as consisting of river sediment, alternating beds of clay, silt, and sand, and a maximum thickness of 33 feet.

Unconfined groundwater flow generally mimics surface topography. Based on the local topography and the location of the Site relative to the Red River, it is anticipated that any shallow groundwater present at the Site would likely flow to the east-southeast.

1.6 Purpose of Work

The purpose of advancing soil borings at the Site was to evaluate subsurface soil conditions around each tank basin to determine the presence of potential petroleum impacts and if there has been petroleum migration through vertical and horizontal features, and at what depth(s) this has occurred. Additionally, the subsurface data collected will be used to aid the client in remediation of any identified petroleum impacts as per the SOW document provided to AET.

As part of the overall environmental assessment, a sensitive receptor survey was also performed following the ND Department of Environmental Quality’s (DEQ) Risk-Based

Corrective Action (RBCA) Technical Guidance. The purpose of the receptor evaluation is to identify possible environmental receptors and exposure pathways present within and around the Site, and to evaluate risk to the environmental receptors via exposure pathways from potentially impacted soil media at the Site.

https://www.dmr.nd.gov/dmr/ndgs/gis-map https://www.dmr.nd.gov/dmr/ndgs/gis-map

1.7 Scope of Work

The scope of work performed on this phase of the project consisted of:

1. contacting local utility companies through ND One Call to identify the locations of underground utility lines and access points on and adjacent to the Site;

2. assisting the property owner with hiring a private utility locating company to locate on-Site private utility lines and access points;

3. researching available information concerning the depths and construction of any water and sewer lines identified on and around the subject Site;

4. mobilizing one environmental professional from AET’s Bismarck, ND office and a two-person drill crew from AET’s Fargo, ND office;

5. advancing five soil borings up to 20 feet below grade (bg) to assess the presence and degree of potential subsurface petroleum impacts in the soil at the three UST basin locations;

6. screening the soil samples recovered from the borings for the presence and concentration of organic vapors as indications of petroleum hydrocarbon impacts;

7. analyzing select soil samples recovered from the borings for the presence and concentration of total petroleum hydrocarbons as gasoline range organics (TPH- GRO), total petroleum hydrocarbons as diesel range organics (TPH-DRO), benzene, toluene, ethylbenzene and xylenes (BTEX), and naphthalene;

8. collecting and testing one soil boring soil sample from each UST basin location (three samples total) for soil resistivity;

9. record depth of groundwater, if encountered, and record visual and olfactory observations to assess potential petroleum impacts in the saturated zone at each UST basin location; and

10. preparing and submitting a Site assessment report including Site description and history; Site figures showing the potential sources, pathways, and receptors assessed; assessment methods used to evaluate the potential for completed pathways and risk including assessment locations, depths, and parameters analyzed; and evaluating all the data generated during our work on this project along with our conclusions and recommendations based on said data.

2.0 PROJECT RESULTS

2.1 Surface Conditions

The areas surrounding the Site consist predominantly of residential homes to the north and west, while the Red River borders the eastern edge of the property. The surface cover on the property itself consists of buildings and parking lots made up of concrete and asphalt pavement. Refer to Figure 2 for an aerial map depicting the surface cover at the Site and adjacent properties.

2.2 Subsurface Conditions

On March 17, 2025, AET personnel advanced five soil borings (B-01 through B-03, B-05, and B-06) at the locations depicted in Figure 2, Appendix A, using methods presented in Appendix B, to depths ranging from 10 to 20 feet bg. The soil borings were advanced at the specified locations to provide data regarding the presence/absence, and degree of potential petroleum impacts in soil resulting from current and historic UST system operations at the Site. A private utility locate was conducted at the Site on March 6, 2025, and revealed a subsurface utility conflict to the east of USTs 1,2, and 3. Due to safety concerns and proximity to the building to the east, a soil boring was not advanced to the east of USTs 1,2, and 3.

The soil profiles encountered at the soil boring locations are illustrated on the boring logs presented in Appendix C. Review of the boring logs indicates the soil profile is generally similar at the boring locations. The predominant soil types encountered consisted of alternating layers of clay, silt, sand, and gravel. Groundwater was encountered at depths ranging from 10 to 16 feet bg.

2.3 Soil Sample Screening Results

Soil samples recovered from the soil borings were screened for the presence and concentration of organic vapors as indications of petroleum impacts, using methods presented in Appendix B. One soil sample exhbited a slightly elevated organic reading of 41 parts per million (ppm). All other soil samples screened at the Site were negligible.

Soil organic vapor screening results can be found on the soil boring logs presented in

Appendix C.

2.4 Soil Analytical Results

Select soil samples were collected and submitted for laboratory analysis of TPH-GRO, TPH-DRO, BTEX, and naphthalene. Soil samples selected for analysis were collected at the interval containing the highest recorded organic vapor field reading at each soil boring location. Petroleum analyte concentrations above the ND RBCA Risk-Based Screening

Level (RBSL) were detected in soil sample B-06 (0-2) with a TPH-DRO concentration of

1,120 milligrams per kilogram (mg/kg). Based on the analytical data collected, petroleum impacts are present in the surface soil interval of soil boring B-06 from 0-2 feet bg. Field screening data below this interval indicated negligible organic vapor readings, suggesting petroleum impacts have not migrated vertically at soil boring B-06 much beyond 2 feet bg.

All other soil samples collected exhibited petroleum analyte concentrations that are below their respective RBSLs, indicating petroleum impacts are not present in surface or subsurface soil samples where the remaining soil borings were advanced at each respective UST location. As stated previously in this Report, a soil boring was not able to be advanced to the east of USTs 1, 2, and 3 due to subsurface utility conflicts, therefore, soil data was not collected in this area. Analytical results, as well as the RBSLs for each measured petroleum analyte, are provided below in Table 1.

Laboratory analytical reports for data presented in this Report are included in

Appendix D.

AET analyzed one soil sample at each respective UST basin location for soil resistivity per communication received from the client on January 8, 2025. Soil samples were collected from depths of 7.5 to 12.5 feet bg to better characterize the native soil conditions within the assumed vertical intervals of the UST basin depths. The samples were analyzed under the ASTM G57 Method utilizing an AEMC Resistivity Tester in a 4-Pin

“Miller Box”. The soil resistivity test results are provided below in Table 2.

TABLE 2

Soil Resistivity Testing Results

Sample

ID

Date Collected

Sample Depth

(feet bg)

Soil Resistivity

(Ω/cm)

B-01 3/17/2025 7.5 - 10 795

B-02 3/17/2025 10 - 12.5 885

B-06 3/17/2025 7.5 - 10 551

Legend:

Ω/cm = ohm per centimeter

2.5 Groundwater Observations

Groundwater was encountered in all soil borings, with the exception of soil boring B-06.

The depth of groundwater encountered ranged from 10 to 16 feet bg, as shown on the soil boring logs presented in Appendix C. Groundwater was evaluated using visual and olfactory observations and accompanying organic vapor field screening data collected from the capillary fringe in borings where groundwater was observed. Although hydrocarbon impacts were identified from 0-2 feet bg in soil boring B-06, groundwater was not encountered in soil boring B-06 to a depth of 20 feet bg. Based on soil analytical data, soil organic vapor screening results, and field observations, no petroleum impacts to groundwater around USTs 1, 2, 3, 4, and 8 appear to be present.

2.6 Sensitive Receptors

Information was collected regarding history of the Site, utility and building infrastructure present at and around the Site, and groundwater usage in the area of the Site. Research was also conducted on the ND Department of Water Resources online database, as well as the National Wetlands Inventory database.

2.7 Exposure Pathway Screening

2.7.1 Surface Water Protection Pathway

The nearest surface water identified within the regional vicinity of the Site consists of the

Red River, which at its nearest point is located approximately 375 feet east-southeast of the Site. Although surficial petroleum impacts were identified from 0-2 feet bg in soil boring

B-06, petroleum impacts were not identified in the downgradient soil boring B-05, suggesting surface soil impacts are confined to the area around soil boring B-06 only.

Furthermore, the surface is capped with impermeable pavement at the location of soil boring B-06 to prevent surface water runoff from contacting the underlying impacted surface soil. Therefore, the Surface Water Protection Pathway is considered an incomplete pathway.

2.7.2 Groundwater Protection Pathway

As stated previously in this Report, groundwater was identified at depths ranging from 10 to 16 feet bg. Although petroleum impacts were identified from 0-2 feet bg in soil boring

B-06, groundwater was not encountered in this soil boring to a depth of 20 feet bg. Based on soil analytical data, soil organic vapor screening results, and field observations, no petroleum impacts to groundwater around USTs 1, 2, 3, 4, and 8 appear to be present.

Therefore, the Groundwater Protection Pathway is considered an incomplete pathway, as well as the Groundwater to Surface Water Pathway.

2.7.3 Impacted Soil in Contact with Underground Utilities

Per utility maps provided by the client, shallow subsurface utility lines do not appear to traverse the area of identified petroleum impacts in soil boring B-06. Soil analytical and organic vapor screening data collected from soil borings B-03 and B-05 suggest impacts have not traveled towards the identified water line to the east of USTs 1, 2, and 3;

however, due to the inability to advance a soil boring in this area, confirmation soil samples were unable to be collected. Also, due to the lack of petroleum analytes and elevated organic vapors measured in soil borings B-01 and B-02, any underground utilities in the areas of USTs 4 and 8 are not likely to be in contact with petroleum impacted subsurface media.

2.7.4 Soil Inhalation, Ingestion, and Dermal Contact

Other than for future construction activities that occur at the Site, the possibility of human receptors coming into physical contact with the identified shallow petroleum impacts at soil boring B-06 is unlikely due to the area being covered with a paved concrete and asphalt parking lot. Additionally, the SOW provided by the client outlines that identified petroleum impacts are to be removed prior to installation of the new UST infrastructure.

The Soil Inhalation, Ingestion, and Dermal Contact Pathway should be considered a potentially complete pathway for construction workers until the shallow petroleum impacts are removed from the area around soil boring B-06 during the upcoming UST upgrades.

3.0 DISCUSSION and CONCLUSIONS

Based on information provided by FourFront, and assessment activities completed by

AET, the following findings can be presented:

• On March 17, 2025, five soil borings were advanced to depths ranging from 10 to

20 feet bg around USTs 1, 2, 3, 4, and 8.

• Due to subsurface utility conflicts, and proximity to the building to the east, a soil boring was not advanced to the east of USTs 1,2, and 3.

• A total of five soil samples were collected from the subsurface interval containing the highest organic vapor field screening reading and submitted for TPH-GRO, TPH-DRO, BTEX, and naphthalene analyses.

• TPH-DRO concentrations above the ND RBCA RBSL was measured in the soil sample collected from soil boring B-06 with a concentration of 1,120 mg/kg. All other soil samples collected exhibited petroleum analyte concentrations that are below their respective RBSLs.

• Field screening data below the 0-2 feet bg interval of soil boring B-06 indicate negligible organic vapor readings, suggesting impacts are isolated to this soil interval and have not migrated vertically.

• Groundwater was encountered at depths ranging from 10 to 16 feet bg in the soil borings advanced at the Site, except in soil boring B-06 where no groundwater was observed to a depth of 20 feet bg.

• Based on recorded field observations, soil organic vapor screening results, and soil analytical data, no petroleum impacts to groundwater around USTs 1, 2, 3, 4, and 8 appear to exist where drilling occurred at each respective UST location.

• The Soil Inhalation, Ingestion, and Dermal Contact Pathway should be considered a potentially complete pathway for construction workers until the shallow petroleum impacts are removed from the area around soil boring B-06 during the upcoming

UST upgrades.

• Soil resistivity tests performed on native soils in the areas of the UST basin locations ranged from 551 to 885 Ʊ/cm.

4.0 RECOMMENDATIONS

Based on the data presented in this Report, AET recommends source removal excavation to a minimum of two feet bg from the area surrounding soil boring B-06 during the UST system upgrade activities.

As stated previously in this Report, per the client SOW, “contaminated soil was discovered and completely removed from the premises in 1992 in the immediate area of construction for USTs 2 and 3.” Therefore, visual and olfactory observation of surface/subsurface soil should be emphasized to the east of USTs 1, 2, and 3 during UST system upgrade activities due to past evidence of petroleum impacts and the inability to advance a soil boring in this area. In the event suspected petroleum impacts are discovered during UST system upgrade activities, it is recommended that work be stopped, and proper evaluation be completed to determine appropriate action.

Typically, petroleum impacted soil excavation activities are guided through on-Site use of a photoionization detector measuring organic vapors to confirm that petroleum impacts have been successfully removed. If FourFront elects to have AET perform this service, a cost estimate and proposal can be provided upon request.

Prior to performing UST system upgrade activities, the ND DEQ UST program should be notified a minimum of 30 days prior to taking the existing UST systems out of service.

5.0 STANDARD OF CARE

Recommendations contained in this report represent our professional opinions. These opinions were arrived at in accordance with currently accepted hydrogeologic and engineering practices at this time and location. Other than this, no warranty is implied or intended.

This report was prepared by: This report was reviewed by:

Taylor Roth Bradley Bishop, CPRR Environmental Project Manager Senior Environmental Project Manager

APPENDIX A

FIGURES

Fargo VA USTs

Fargo, ND

SITE

rd

S t

N n d S t N

E lm

S t

N

VA Hospital Park

SOURCE: USGS The National Map: National Boundaries Dataset, 3DEP Elevation Program, Geographic Names Information System, National Hydrography Dataset, National Land Cover Database, National Structures Dataset, and National Transportation Dataset; USGS Global Ecosystems; U.S. Census Bureau TIGER/Line data; USFS Road data; Natural Earth Data; U.S. Department of State HIU; NOAA National Centers for Environmental Information. Data refreshed February, 2025., Sources: Esri, TomTom, Garmin, 0 500 1000

Feet

Figure 1 Site Location Map

Date: 3/24/2025 AET Project No. P-0040293

Veterans Affairs Medical Center

B-01

B-03

B-06

B-02

0 50 100

Feet

Figure 2 Boring Location Map

Fargo VA USTs FourFront Design, Inc.

Fargo, ND

19th Ave N

12th Ave N

Hector International

Airport

FARGO

Legend

Approximate Boring Locations

Date: 4/1/2025 AET Project No. P-0040293

UST #1

UST #2

UST #3

UST #4

UST #8

Approximate UST Locations

B-05

Approximate Water Line Location

APPENDIX B

METHODOLOGIES

METHODOLOGIES

The following are brief descriptions of the methodologies which will be used during this study.

Soil Boring/Monitoring Well Locations Soil borings are placed at locations to determine the degree of potential petroleum impacts to the soi. The locations are verified with the client and placed in conjunction with the private utility locate results.

Soil Boring Advancement and Sampling The soil borings are advanced using a conventional rotary drill rig with a split spoon soil sampler.The soil boring soil samples are collected in laboratory prepared jar(s), appropriate to the sample procedure.

Soil Sample Screening The soil samples are screened for the presence of organic vapors as an indication of hydrocarbon impacts using a Photoionization Detector (PID). This instrument provides readings in parts per million (ppm) equivalents of the calibration gas. The lower detectable limit is approximately 1 ppm.

The soil samples are collected in Whirl-pak® or Ziploc® baggies and taken to a well-ventilated area. The samples are allowed to equilibrate to room temperature. The samples are vigorously agitated for at least thirty seconds over a ten-minute headspace development period. In turn, each soil jar/bag is opened/punctured as appropriate; the PID probe is quickly inserted through the aluminum foil or plastic bag and the maximum meter response (should be within 2-5 seconds) is recorded. Erratic responses are discounted as a result of high organic vapor concentrations or conditions of elevated headspace moisture.

Contamination Reduction The drill rig and sampler are steam cleaned prior to mobilization and in between soil boring locations if evidence of impacts is identified during field screening of soils.

Soil Boring Abandonment Following completion of field investigation activities, any soil borings not completed as permanent monitoring wells are abandoned in accordance with North Dakota Administrative Code Chapter 33-18-02 regulations.

Chemical Analysis – soil The soil samples are analyzed for the presence and concentration of TPH-GRO, TPH- DRO, BTEX, and naphthalene according to the appropriate NDDEQ Site investigation requirements.

Soil Resistivity Testing Soil resistivity testing will be performed by AET through use of a “Miller Box” which utilizes the AASHTO-T288 Standard Method of Test for Determining Minimum Laboratory Soil Resistivity.

Chain of Custody Upon collection of a sample to be analyzed in the laboratory, a chain of custody log is initiated. The chain of custody log includes the following information: project, work order number, shipped by, shipped to, project manager, sampling point, location, field identification number, date taken, sample type, number of containers, analysis required, and sampler's signature.

The chain of custody log is delivered with the samples to the laboratory. Upon arrival at the laboratory, the samples are checked in and custody of the samples signed over to the appropriate laboratory personnel. A copy of the chain of custody log is submitted to the project manager.

Quality Assurance/Quality Control (QA/QC) QA/QC manuals are available at AET offices for review.

Reporting Complete a Site assessment report in accordance with the NDDEQ Guidelines for Environmental Site Assessment Reports based on the NDDEQ Investigation of Contaminated Release Sites guidance document. Reports are prepared that 1) present and summarize the results of the work conducted, 2) include Site location and study area maps, 3) give our opinion regarding the presence of petroleum hydrocarbons and the necessity for additional work, and 4) if the results of the study warrant additional work, recommend the scope of additional work.

Staffing Taylor Roth is the Project Manager for this project. The Project Manager is assisted by the balance of the North Dakota office staff as needed.

APPENDIX C

SOIL BORING LOGS

CONCRETE, 8-inches

LEAN CLAY, dark brown, moist

No Sample - Soil Resistivity Test

SILTY LEAN CLAY, light grey, moist

SILT, light brown, saturated

LEAN CLAY, grey, moist

Total Depth- 14 feet

0.1

0.1

0.2

0.3

0.1

WATER

LEVEL

SURFACE ELEVATION:

BORING

COMPLETED:

WATER LEVEL MEASUREMENTS

14 ft

DATE

10-12

NOTE: REFER TO

THE ATTACHED

SHEETS FOR AN

EXPLANATION OF

TERMINOLOGY ON

THIS LOG

Rig:

NA

AL LG:

DEPTH:

DRILLING

FLUID LEVEL

11:45

DR:

NA

CAVE-IN

DEPTH

CASING

DEPTH

SAMPLED

DEPTH

3/17/25

TIME

DRILLING METHOD

3/17/25

3.25" HSA14.0

NA

03/2011

DENDEN

P-0040293

Fargo Veterans Affairs Healthcare System; Fargo, North Dakota

N

SUBSURFACE BORING LOG

FIELD & LABORATORY TESTS

LOG OF BORING NO.

GEOLOGY

LATITUDE:

B-01 (p. 1 of 1)

01-DHR-060

LL

SAMPLE

TYPE

DEPTH

IN

FEET

MC

AET JOB NO:

PROJECT:

REC

IN. PID

(ppm)

MATERIAL DESCRIPTION

PLWC

LONGITUDE:

A E

T _C

O R

P W

-L A

T -L

O N

G P

-0

B O

R

IN

G L

O G

S .G

P J

A E

T

C P

T

W E

LL

.G

D T

/2

6/

ASPHALT, 6-inches

No Recovery

LEAN CLAY, dark brown, moist, trace gravel at 7 feet

No Sample - Soil Resistivity Test

LEAN CLAY, grey, moist

SANDY SILT, light brown, moist

Total Depth- 14 feet

1.7

0.2

0.6

0.3

0.2

0.2

WATER

LEVEL

SURFACE ELEVATION:

BORING

COMPLETED:

WATER LEVEL MEASUREMENTS

14 ft

DATE

0-2

NOTE: REFER TO

THE ATTACHED

SHEETS FOR AN

EXPLANATION OF

TERMINOLOGY ON

THIS LOG

Rig:

NA

AL LG:

DEPTH:

DRILLING

FLUID LEVEL

12:45

DR:

NA

CAVE-IN

DEPTH

CASING

DEPTH

SAMPLED

DEPTH

3/17/25

TIME

DRILLING METHOD

3/17/25

3.25" HSA14.0

NA

03/2011

DENDEN

P-0040293

Fargo Veterans Affairs Healthcare System; Fargo, North Dakota

N

SUBSURFACE BORING LOG

FIELD & LABORATORY TESTS

LOG OF BORING NO.

GEOLOGY

LATITUDE:

B-02 (p. 1 of 1)

01-DHR-060

LL

SAMPLE

TYPE

DEPTH

IN

FEET

MC

AET JOB NO:

PROJECT:

REC

IN. PID

(ppm)

MATERIAL DESCRIPTION

PLWC

LONGITUDE:

A E

T _C

O R

P W

-L A

T -L

O N

G P

-0

B O

R

IN

G L

O G

S .G

P J

A E

T

C P

T

W E

LL

.G

D T

/2

ASPHALT, 8-inches

LEAN CLAY, trace coarse sand, brown, moist WELL GRADED SAND, brown, moist

LEAN CLAY, trace coarse sand, brown, moist POORLY GRADED SAND, trace silt and clay, brown, moist

GRAVEL, saturated

Total Depth- 10 feet

0.7

0.4

0.2

0.3

0.2

WATER

LEVEL

SURFACE ELEVATION:

BORING

COMPLETED:

WATER LEVEL MEASUREMENTS

10 ft

DATE

0-2

NOTE: REFER TO

THE ATTACHED

SHEETS FOR AN

EXPLANATION OF

TERMINOLOGY ON

THIS LOG

Rig:

NA

AL LG:

DEPTH:

DRILLING

FLUID LEVEL

10:00

DR:

NA

CAVE-IN

DEPTH

CASING

DEPTH

SAMPLED

DEPTH

3/17/25

TIME

DRILLING METHOD

3/17/25

3.25" HSA10.0

NA

03/2011

DENDEN

P-0040293

Fargo Veterans Affairs Healthcare System; Fargo, North Dakota

N

SUBSURFACE BORING LOG

FIELD & LABORATORY TESTS

LOG OF BORING NO.

GEOLOGY

LATITUDE:

B-03 (p. 1 of 1)

01-DHR-060

LL

SAMPLE

TYPE

DEPTH

IN

FEET

MC

AET JOB NO:

PROJECT:

REC

IN. PID

(ppm)

MATERIAL DESCRIPTION

PLWC

LONGITUDE:

A E

T _C

O R

P W

-L A

T -L

O N

G P

-0

B O

R

IN

G L

O G

S .G

P J

A E

T

C P

T

W E

LL

.G

D T

/2

ASPHALT, 6.5-inches

SILTY LEAN CLAY, light grey, moist trace sand at 4 feet

POORLY GRADED SAND, light brown, moist CLAYEY SILT, trace sand, brown, moist

LEAN CLAY, trace silt and lignite, grey to brown, moist, saturated at 16 feet

Total Depth- 16 feet

2.3

2.4

1.6

0.6

0.3

1.5

0.5

0.1

WATER

LEVEL

SURFACE ELEVATION:

BORING

COMPLETED:

WATER LEVEL MEASUREMENTS

16 ft

DATE

2-4

NOTE: REFER TO

THE ATTACHED

SHEETS FOR AN

EXPLANATION OF

TERMINOLOGY ON

THIS LOG

Rig:

NA

AL LG:

DEPTH:

DRILLING

FLUID LEVEL

9:00

DR:

NA

CAVE-IN

DEPTH

CASING

DEPTH

SAMPLED

DEPTH

3/17/25

TIME

DRILLING METHOD

3/17/25

3.25" HSA16.0

NA

03/2011

DENDEN

P-0040293

Fargo Veterans Affairs Healthcare System; Fargo, North Dakota

N

SUBSURFACE BORING LOG

FIELD & LABORATORY TESTS

LOG OF BORING NO.

GEOLOGY

LATITUDE:

B-05 (p. 1 of 1)

01-DHR-060

LL

SAMPLE

TYPE

DEPTH

IN

FEET

MC

AET JOB NO:

PROJECT:

REC

IN. PID

(ppm)

MATERIAL DESCRIPTION

PLWC

LONGITUDE:

A E

T _C

O R

P W

-L A

T -L

O N

G P

-0

B O

R

IN

G L

O G

S .G

P J

A E

T

C P

T

W E

LL

.G

D T

/2

ASPHALT, 6-inches No Recovery

POORLY GRADED SAND, brown, dry LEAN CLAY, trace coarse sand, dark brown, moist

No Sample - Soil Resistivity Test

LEAN CLAY, grey and brown, moist with silt below 16 feet

SILT, trace clay, light brown, moist Saturated at 17.5 feet SILTY SAND, fine-grained, light brown, moist

Total Depth- 20 feet

41.1

6.4

4.2

0.1

0.1

0.1

WATER

LEVEL

SURFACE ELEVATION:

BORING

COMPLETED:

WATER LEVEL MEASUREMENTS

None

DATE

0-2

NOTE: REFER TO

THE ATTACHED

SHEETS FOR AN

EXPLANATION OF

TERMINOLOGY ON

THIS LOG

Rig:

NA

AL LG:

DEPTH:

DRILLING

FLUID LEVEL

10:45

DR:

NA

CAVE-IN

DEPTH

CASING

DEPTH

SAMPLED

DEPTH

3/17/25

TIME

DRILLING METHOD

3/17/25

3.25" HSA20.0

NA

03/2011

DENDEN

P-0040293

Fargo Veterans Affairs Healthcare System; Fargo, North Dakota

N

SUBSURFACE BORING LOG

FIELD & LABORATORY TESTS

LOG OF BORING NO.

GEOLOGY

LATITUDE:

B-06 (p. 1 of 1)

01-DHR-060

LL

SAMPLE

TYPE

DEPTH

IN

FEET

MC

AET JOB NO:

PROJECT:

REC

IN. PID

(ppm)

MATERIAL DESCRIPTION

PLWC

LONGITUDE:

A E

T _C

O R

P W

-L A

T -L

O N

G P

-0

B O

R

IN

G L

O G

S .G

P J

A E

T

C P

T

W E

LL

.G

D T

/2

APPENDIX D

LABORATORY ANALYTICAL REPORTS

ANALYTICAL REPORT

PREPARED FOR

Attn: Anthony Ligutom

American Engineering Testing Inc.

2110 Lovett Ave #5

Bismarck, North Dakota 58504 Generated 3/27/2025 3:48:49 PM

JOB DESCRIPTION

Fargo VA UST

P-0040293

JOB NUMBER

310-302221-1

See page two for job notes and contact information.

Cedar Falls IA 50613 3019 Venture Way Eurofins Cedar Falls https://eol.et.eurofinsus.com/myEOL/ troth Reviewed

Eurofins Cedar Falls

Eurofins Cedar Falls is a laboratory within Eurofins Environment Testing North Central, LLC, a company within Eurofins Environment Testing Group of Companies

Job Notes This report may not be reproduced except in full, and with written approval from the laboratory. The results relate only to the samples tested. For questions please contact the Project Manager at the e-mail address or telephone number listed on this page.

The test results in this report relate only to the samples as received by the laboratory and will meet all requirements of the methodology, with any exceptions noted. This report shall not be reproduced except in full, without the express written approval of the laboratory. All questions should be directed to the Eurofins Environment Testing North Central, LLC Project Manager.

Authorization

Generated

3/27/2025 3:48:49 PM

Authorized for release by Zach Bindert, Senior Project Manager Zach.Bindert@et.eurofinsus.com (319)595-2016

Page 2 of 25 3/27/2025

Table of Contents

Client: American Engineering Testing Inc.

Project/Site: Fargo VA UST

Laboratory Job ID: 310-302221-1

SDG: P-0040293

Eurofins Cedar Falls

3/27/2025

Cover Page

Table of Contents

Case Narrative

Sample Summary

Detection Summary

Client Sample Results

Definitions

Surrogate Summary

QC Sample Results

QC Association

Chronicle

Certification Summary

Method Summary

Chain of Custody

Receipt Checklists

Job Narrative 310-302221-1

Analytical test results meet all requirements of the associated regulatory program listed on the Accreditation/Certification Summary Page unless otherwise noted under the individual analysis. Data qualifiers and/or narrative comments are included to explain any exceptions, if applicable.

· Matrix QC may not be reported if insufficient sample is provided or site-specific QC samples were not submitted. In these situations, to demonstrate precision and accuracy at a batch level, a LCS/LCSD may be performed, unless otherwise specified in the method.

· Surrogate and/or isotope dilution analyte recoveries (if applicable) which are outside of the QC window are confirmed unless attributed to a dilution or otherwise noted in the narrative.

Regulated compliance samples (e.g. SDWA, NPDES) must comply with the associated agency requirements/permits.

Receipt The samples were received on 3/18/2025 9:20 AM. Unless otherwise noted below, the samples arrived in good condition, and, where required, properly preserved and on ice. The temperature of the cooler at receipt time was 1.8°C.

GC/MS VOA

No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.

Gasoline Range Organics Method 8015C_GRO: The surrogate recovery for the LCS associated with preparation batch 310-449282 and analytical batch 310-449286 was outside the upper control limits.

No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.

Diesel Range Organics Method 8015C_DRO: Due to the matrix, the initial volume(s) used for the following sample deviated from the standard procedure:

B-01 (10-12) (310-302221-1). The reporting limits (RLs) have been adjusted proportionately.

Method 8015C_DRO: Surrogate recovery for the following sample was outside control limits: B-06 (0-2) (310-302221-5). Evidence of matrix interference is present; therefore, re-extraction and/or re-analysis was not performed.

Method 8015C_DRO: Surrogate recovery for the following sample was outside control limits: B-01 (10-12) (310-302221-1).

Evidence of matrix interference is present as the sample was re-prepped and rerun to confirm results.

No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.

General Chemistry No additional analytical or quality issues were noted, other than those described above or in the Definitions/ Glossary page.

Case Narrative Client: American Engineering Testing Inc. Job ID: 310-302221-1 Project: Fargo VA UST

Eurofins Cedar Falls

Job ID: 310-302221-1 Eurofins Cedar Falls

Page 4 of 25 3/27/2025

Sample Summary Client: American Engineering Testing Inc. Job ID: 310-302221-1

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID Client Sample ID Matrix Collected Received

310-302221-1 B-01 (10-12) Solid 03/17/25 11:25 03/18/25 09:20

310-302221-2 B-02 (0-2) Solid 03/17/25 13:18 03/18/25 09:20

310-302221-3 B-03 (0-2) Solid 03/17/25 10:25 03/18/25 09:20

310-302221-4 B-05 (2-4) Solid 03/17/25 09:40 03/18/25 09:20

310-302221-5 B-06 (0-2) Solid 03/17/25 11:25 03/18/25 09:20

Eurofins Cedar Falls Page 5 of 25 3/27/2025

Detection Summary Job ID: 310-302221-1Client: American Engineering Testing Inc.

SDG: P-0040293Project/Site: Fargo VA UST

Client Sample ID: B-01 (10-12) Lab Sample ID: 310-302221-1

No Detections.

Client Sample ID: B-02 (0-2) Lab Sample ID: 310-302221-2

No Detections.

Client Sample ID: B-03 (0-2) Lab Sample ID: 310-302221-3

☼Diesel Range Organics [C10-C28]

RL

11.2 mg/Kg

MDLAnalyte Result Qualifier Unit Dil Fac D Method Prep Type

Total/NA115.6 8015C

Client Sample ID: B-05 (2-4) Lab Sample ID: 310-302221-4

No Detections.

Client Sample ID: B-06 (0-2) Lab Sample ID: 310-302221-5

☼Diesel Range Organics [C10-C28]

RL

66.6 mg/Kg

MDLAnalyte Result Qualifier Unit Dil Fac D Method Prep Type

Total/NA11120 8015C

Eurofins Cedar Falls

This Detection Summary does not include radiochemical test results.

Page 6 of 25 3/27/2025

Client Sample Results

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID: 310-302221-1Client Sample ID: B-01 (10-12) Matrix: SolidDate Collected: 03/17/25 11:25

Date Received: 03/18/25 09:20

Method: SW846 8260D - Volatile Organic Compounds by GC/MS

RL MDL

<0.0145 0.0145 mg/Kg ☼ 03/27/25 07:47 03/27/25 09:05 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Benzene

0.0145 mg/Kg 03/27/25 07:47 03/27/25 09:05 1☼<0.0145Ethylbenzene

0.0145 mg/Kg 03/27/25 07:47 03/27/25 09:05 1☼<0.0145Methyl tert-butyl ether

0.0727 mg/Kg 03/27/25 07:47 03/27/25 09:05 1☼<0.0727Naphthalene

0.0145 mg/Kg 03/27/25 07:47 03/27/25 09:05 1☼<0.0145Toluene

0.0291 mg/Kg 03/27/25 07:47 03/27/25 09:05 1☼<0.0291Xylenes, Total

4-Bromofluorobenzene (Surr) 103 80 - 120 03/27/25 07:47 03/27/25 09:05 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 100 03/27/25 07:47 03/27/25 09:05 180 - 127

Toluene-d8 (Surr) 101 03/27/25 07:47 03/27/25 09:05 180 - 120

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

RL MDL

<16.6 16.6 mg/Kg ☼ 03/19/25 14:26 03/19/25 20:38 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Gasoline Range Organics

(GRO)-C6-C12

4-Bromofluorobenzene (Surr) 109 47 - 150 03/19/25 14:26 03/19/25 20:38 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics)

RL MDL

<50.4 50.4 mg/Kg ☼ 03/25/25 08:01 03/25/25 10:59 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Diesel Range Organics [C10-C28] n-Octacosane 10 S1- 12 - 150 03/25/25 08:01 03/25/25 10:59 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

General Chemistry

RL RL

25.8 0.1 % 03/19/25 14:35 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Percent Moisture (EPA Moisture)

0.1 % 03/19/25 14:35 174.2Percent Solids (EPA Moisture)

Eurofins Cedar Falls

Page 7 of 25 3/27/2025

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID: 310-302221-2Client Sample ID: B-02 (0-2) Matrix: SolidDate Collected: 03/17/25 13:18

Date Received: 03/18/25 09:20

Method: SW846 8260D - Volatile Organic Compounds by GC/MS

RL MDL

<0.0123 0.0123 mg/Kg ☼ 03/27/25 07:47 03/27/25 09:29 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Benzene

0.0123 mg/Kg 03/27/25 07:47 03/27/25 09:29 1☼<0.0123Ethylbenzene

0.0123 mg/Kg 03/27/25 07:47 03/27/25 09:29 1☼<0.0123Methyl tert-butyl ether

0.0613 mg/Kg 03/27/25 07:47 03/27/25 09:29 1☼<0.0613Naphthalene

0.0123 mg/Kg 03/27/25 07:47 03/27/25 09:29 1☼<0.0123Toluene

0.0245 mg/Kg 03/27/25 07:47 03/27/25 09:29 1☼<0.0245Xylenes, Total

4-Bromofluorobenzene (Surr) 103 80 - 120 03/27/25 07:47 03/27/25 09:29 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 102 03/27/25 07:47 03/27/25 09:29 180 - 127

Toluene-d8 (Surr) 97 03/27/25 07:47 03/27/25 09:29 180 - 120

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

RL MDL

<9.99 9.99 mg/Kg ☼ 03/19/25 14:26 03/19/25 21:04 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Gasoline Range Organics

(GRO)-C6-C12

4-Bromofluorobenzene (Surr) 106 47 - 150 03/19/25 14:26 03/19/25 21:04 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics)

RL MDL

<10.2 10.2 mg/Kg ☼ 03/21/25 08:01 03/24/25 13:46 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Diesel Range Organics [C10-C28] n-Octacosane 24 12 - 150 03/21/25 08:01 03/24/25 13:46 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

General Chemistry

RL RL

3.9 0.1 % 03/19/25 14:35 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Percent Moisture (EPA Moisture)

0.1 % 03/19/25 14:35 196.1Percent Solids (EPA Moisture)

Eurofins Cedar Falls

Page 8 of 25 3/27/2025

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID: 310-302221-3Client Sample ID: B-03 (0-2) Matrix: SolidDate Collected: 03/17/25 10:25

Date Received: 03/18/25 09:20

Method: SW846 8260D - Volatile Organic Compounds by GC/MS

RL MDL

<0.0119 0.0119 mg/Kg ☼ 03/27/25 07:47 03/27/25 09:53 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Benzene

0.0119 mg/Kg 03/27/25 07:47 03/27/25 09:53 1☼<0.0119Ethylbenzene

0.0119 mg/Kg 03/27/25 07:47 03/27/25 09:53 1☼<0.0119Methyl tert-butyl ether

0.0596 mg/Kg 03/27/25 07:47 03/27/25 09:53 1☼<0.0596Naphthalene

0.0119 mg/Kg 03/27/25 07:47 03/27/25 09:53 1☼<0.0119Toluene

0.0238 mg/Kg 03/27/25 07:47 03/27/25 09:53 1☼<0.0238Xylenes, Total

4-Bromofluorobenzene (Surr) 100 80 - 120 03/27/25 07:47 03/27/25 09:53 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 98 03/27/25 07:47 03/27/25 09:53 180 - 127

Toluene-d8 (Surr) 97 03/27/25 07:47 03/27/25 09:53 180 - 120

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

RL MDL

<12.8 12.8 mg/Kg ☼ 03/19/25 14:26 03/19/25 21:30 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Gasoline Range Organics

(GRO)-C6-C12

4-Bromofluorobenzene (Surr) 108 47 - 150 03/19/25 14:26 03/19/25 21:30 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics)

RL MDL

15.6 11.2 mg/Kg ☼ 03/21/25 08:01 03/24/25 14:02 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Diesel Range Organics [C10-C28] n-Octacosane 80 12 - 150 03/21/25 08:01 03/24/25 14:02 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

General Chemistry

RL RL

13.2 0.1 % 03/19/25 14:35 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Percent Moisture (EPA Moisture)

0.1 % 03/19/25 14:35 186.8Percent Solids (EPA Moisture)

Eurofins Cedar Falls

Page 9 of 25 3/27/2025

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID: 310-302221-4Client Sample ID: B-05 (2-4) Matrix: SolidDate Collected: 03/17/25 09:40

Date Received: 03/18/25 09:20

Method: SW846 8260D - Volatile Organic Compounds by GC/MS

RL MDL

<0.0118 0.0118 mg/Kg ☼ 03/27/25 07:47 03/27/25 10:17 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Benzene

0.0118 mg/Kg 03/27/25 07:47 03/27/25 10:17 1☼<0.0118Ethylbenzene

0.0118 mg/Kg 03/27/25 07:47 03/27/25 10:17 1☼<0.0118Methyl tert-butyl ether

0.0592 mg/Kg 03/27/25 07:47 03/27/25 10:17 1☼<0.0592Naphthalene

0.0118 mg/Kg 03/27/25 07:47 03/27/25 10:17 1☼<0.0118Toluene

0.0237 mg/Kg 03/27/25 07:47 03/27/25 10:17 1☼<0.0237Xylenes, Total

4-Bromofluorobenzene (Surr) 105 80 - 120 03/27/25 07:47 03/27/25 10:17 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 101 03/27/25 07:47 03/27/25 10:17 180 - 127

Toluene-d8 (Surr) 99 03/27/25 07:47 03/27/25 10:17 180 - 120

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

RL MDL

<13.7 13.7 mg/Kg ☼ 03/19/25 14:26 03/19/25 21:55 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Gasoline Range Organics

(GRO)-C6-C12

4-Bromofluorobenzene (Surr) 105 47 - 150 03/19/25 14:26 03/19/25 21:55 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics)

RL MDL

<11.9 11.9 mg/Kg ☼ 03/21/25 08:01 03/24/25 14:17 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Diesel Range Organics [C10-C28] n-Octacosane 58 12 - 150 03/21/25 08:01 03/24/25 14:17 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

General Chemistry

RL RL

18.0 0.1 % 03/19/25 14:35 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Percent Moisture (EPA Moisture)

0.1 % 03/19/25 14:35 182.0Percent Solids (EPA Moisture)

Eurofins Cedar Falls

Page 10 of 25 3/27/2025

SDG: P-0040293Project/Site: Fargo VA UST

Lab Sample ID: 310-302221-5Client Sample ID: B-06 (0-2) Matrix: SolidDate Collected: 03/17/25 11:25

Date Received: 03/18/25 09:20

Method: SW846 8260D - Volatile Organic Compounds by GC/MS

RL MDL

<0.0122 0.0122 mg/Kg ☼ 03/27/25 07:47 03/27/25 10:41 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Benzene

0.0122 mg/Kg 03/27/25 07:47 03/27/25 10:41 1☼<0.0122Ethylbenzene

0.0122 mg/Kg 03/27/25 07:47 03/27/25 10:41 1☼<0.0122Methyl tert-butyl ether

0.0610 mg/Kg 03/27/25 07:47 03/27/25 10:41 1☼<0.0610Naphthalene

0.0122 mg/Kg 03/27/25 07:47 03/27/25 10:41 1☼<0.0122Toluene

0.0244 mg/Kg 03/27/25 07:47 03/27/25 10:41 1☼<0.0244Xylenes, Total

4-Bromofluorobenzene (Surr) 102 80 - 120 03/27/25 07:47 03/27/25 10:41 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Dibromofluoromethane (Surr) 103 03/27/25 07:47 03/27/25 10:41 180 - 127

Toluene-d8 (Surr) 100 03/27/25 07:47 03/27/25 10:41 180 - 120

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

RL MDL

<9.98 9.98 mg/Kg ☼ 03/19/25 14:26 03/19/25 22:21 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Gasoline Range Organics

(GRO)-C6-C12

4-Bromofluorobenzene (Surr) 108 47 - 150 03/19/25 14:26 03/19/25 22:21 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

Method: SW846 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics)

RL MDL

1120 66.6 mg/Kg ☼ 03/21/25 08:01 03/24/25 16:04 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Diesel Range Organics [C10-C28] n-Octacosane 272 S1+ 12 - 150 03/21/25 08:01 03/24/25 16:04 1

Surrogate Dil FacAnalyzedPreparedQualifier Limits%Recovery

General Chemistry

RL RL

2.3 0.1 % 03/19/25 14:35 1

Analyte Dil FacAnalyzedPreparedUnit DResult Qualifier

Percent Moisture (EPA Moisture)

0.1 % 03/19/25 14:35 197.7Percent Solids (EPA Moisture)

Eurofins Cedar Falls

Page 11 of 25 3/27/2025

Definitions/Glossary

SDG: P-0040293Project/Site: Fargo VA UST

Qualifiers

GC VOA

Qualifier Description

S1+ Surrogate recovery exceeds control limits, high biased.

Qualifier

GC Semi VOA Qualifier Description

S1- Surrogate recovery exceeds control limits, low biased.

Qualifier

S1+ Surrogate recovery exceeds control limits, high biased.

Glossary

These commonly used abbreviations may or may not be present in this report.

☼ Listed under the "D" column to designate that the result is reported on a dry weight basis

Abbreviation

%R Percent Recovery

CFL Contains Free Liquid

CFU Colony Forming Unit

CNF Contains No Free Liquid

DER Duplicate Error Ratio (normalized absolute difference)

Dil Fac Dilution Factor

DL Detection Limit (DoD/DOE)

DL, RA, RE, IN Indicates a Dilution, Re-analysis, Re-extraction, or additional Initial metals/anion analysis of the sample

DLC Decision Level Concentration (Radiochemistry)

EDL Estimated Detection Limit (Dioxin)

LOD Limit of Detection (DoD/DOE)

LOQ Limit of Quantitation (DoD/DOE)

MCL EPA recommended "Maximum Contaminant Level"

MDA Minimum Detectable Activity (Radiochemistry)

MDC Minimum Detectable Concentration (Radiochemistry)

MDL Method Detection Limit

ML Minimum Level (Dioxin)

MPN Most Probable Number

MQL Method Quantitation Limit

NC Not Calculated

ND Not Detected at the reporting limit (or MDL or EDL if shown)

NEG Negative / Absent

POS Positive / Present

PQL Practical Quantitation Limit

PRES Presumptive

QC Quality Control

RER Relative Error Ratio (Radiochemistry)

RL Reporting Limit or Requested Limit (Radiochemistry)

RPD Relative Percent Difference, a measure of the relative difference between two points

TEF Toxicity Equivalent Factor (Dioxin)

TEQ Toxicity Equivalent Quotient (Dioxin)

TNTC Too Numerous To Count

Eurofins Cedar Falls

Page 12 of 25 3/27/2025

Surrogate Summary

SDG: P-0040293Project/Site: Fargo VA UST

Method: 8260D - Volatile Organic Compounds by GC/MS Prep Type: Total/NAMatrix: Solid

Lab Sample ID Client Sample ID (80-120) (80-127) (80-120)

BFB DBFM TOL

103 100 101310-302221-1

Percent Surrogate Recovery (Acceptance Limits)

B-01 (10-12)

103 102 97310-302221-2 B-02 (0-2)

100 98 97310-302221-3 B-03 (0-2)

105 101 99310-302221-4 B-05 (2-4)

102 103 100310-302221-5 B-06 (0-2)

103 101 101LCS 310-449885/2-A Lab Control Sample

103 100 98MB 310-449885/1-A Method Blank

Surrogate Legend

BFB = 4-Bromofluorobenzene (Surr)

DBFM = Dibromofluoromethane (Surr)

TOL = Toluene-d8 (Surr)

Method: 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics) Prep Type: Total/NAMatrix: Solid

Lab Sample ID Client Sample ID (47-150)

BFB1

109310-302221-1

Percent Surrogate Recovery (Acceptance Limits)

B-01 (10-12)

105310-302221-1 MS B-01 (10-12)

105310-302221-1 MSD B-01 (10-12)

106310-302221-2 B-02 (0-2)

108310-302221-3 B-03 (0-2)

105310-302221-4 B-05 (2-4)

108310-302221-5 B-06 (0-2)

264 S1+LCS 310-449282/3-A Lab Control Sample

107MB 310-449282/1-A Method Blank

Surrogate Legend

BFB = 4-Bromofluorobenzene (Surr)

Method: 8015C - Nonhalogenated Organics using GC/FID -Modified (Diesel Range Organics) Prep Type: Total/NAMatrix: Solid

Lab Sample ID Client Sample ID (12-150)

OTCN1

10 S1-310-302221-1

Percent Surrogate Recovery (Acceptance Limits)

B-01 (10-12)

24310-302221-2 B-02 (0-2)

80310-302221-3 B-03 (0-2)

58310-302221-4 B-05 (2-4)

272 S1+310-302221-5 B-06 (0-2)

65LCS 310-449459/2-A Lab Control Sample

118LCS 310-449681/2-A Lab Control Sample

73MB 310-449459/1-A Method Blank

109MB 310-449681/1-A Method Blank

Surrogate Legend

OTCN = n-Octacosane

Eurofins Cedar Falls

Page 13 of 25 3/27/2025

QC Sample Results

SDG: P-0040293Project/Site: Fargo VA UST

Method: 8260D - Volatile Organic Compounds by GC/MS

Client Sample ID: Method BlankLab Sample ID: MB 310-449885/1-A

Matrix: Solid Prep Type: Total/NA

Analysis Batch: 449882 Prep Batch: 449885

RL MDL

Benzene <0.00931 0.00931 mg/Kg 03/27/25 07:47 03/27/25 08:16 1

MB MB

Analyte Dil FacAnalyzedPreparedDUnitResult Qualifier

<0.00931 0.00931 mg/Kg 03/27/25 07:47 03/27/25 08:16 1Ethylbenzene

<0.00931 0.00931 mg/Kg 03/27/25 07:47 03/27/25 08:16 1Methyl tert-butyl ether

<0.0465 0.0465 mg/Kg 03/27/25 07:47 03/27/25 08:16 1Naphthalene

<0.00931 0.00931 mg/Kg 03/27/25 07:47 03/27/25 08:16 1Toluene

<0.0186 0.0186 mg/Kg 03/27/25 07:47 03/27/25 08:16 1Xylenes, Total

4-Bromofluorobenzene (Surr) 103 80 - 120 03/27/25 08:16 1

MB MB

Surrogate

03/27/25 07:47

Dil FacPrepared AnalyzedQualifier Limits%Recovery

100 03/27/25 07:47 03/27/25 08:16 1Dibromofluoromethane (Surr) 80 - 127

98 03/27/25 07:47 03/27/25 08:16 1Toluene-d8 (Surr) 80 - 120

Client Sample ID: Lab Control SampleLab Sample ID: LCS 310-449885/2-A

Matrix: Solid Prep Type: Total/NA

Analysis Batch: 449882 Prep Batch: 449885

Benzene 0.0764 0.07502 mg/Kg 98 75 - 137

Analyte

LCS LCS

DUnitResult Qualifier %Rec

Spike

Added

%Rec

Limits

Ethylbenzene 0.0764 0.07065 mg/Kg 92 73 - 126

Methyl tert-butyl ether 0.0764 0.07896 mg/Kg 103 71 - 144

Naphthalene 0.0764 0.07239 mg/Kg 95 50 - 150

Toluene 0.0764 0.07238 mg/Kg 95 72 - 126

Xylenes, Total 0.153 0.1427 mg/Kg 93 70 - 129

4-Bromofluorobenzene (Surr) 80 - 120

Surrogate

LCS LCS

Qualifier Limits%Recovery

101Dibromofluoromethane (Surr) 80 - 127

101Toluene-d8 (Surr) 80 - 120

Method: 8015C - Nonhalogenated Organics using GC/FID -Modified (Gasoline Range Organics)

Client Sample ID: Method BlankLab Sample ID: MB 310-449282/1-A

Matrix: Solid Prep Type: Total/NA

Analysis Batch: 449286 Prep Batch: 449282

RL MDL

Gasoline Range Organics

(GRO)-C6-C12

<9.30 9.30 mg/Kg 03/19/25 14:26 03/19/25 17:11 1

MB MB

Analyte Dil FacAnalyzedPreparedDUnitResult Qualifier

4-Bromofluorobenzene (Surr) 107 47 - 150 03/19/25…