Waste_Characterization_Tuba_City_Dump_8-14-2024.pdf

Waste Characterization Tuba City Dump

Prepared for The Hopi Tribe Kykotsmovi, Arizona

Prepared by

6020 Academy NE, Suite 100 Albuquerque, New Mexico 87109 www.dbstephens.com

DB23.1091

August 14, 2024

DB23.1091 | TCD Waste Chrctrztn_814.docx i

Table of Contents

1. Introduction

2. Methods

3. Results

4. Conclusions

References

List of Figures

1 Waste Characterization Sample Locations 2 Box Plots of Radium-226 in Sediments and Rocks 3 Radioactivity Measurements in Sediments and Rocks

List of Tables

1 Waste Characterization Sample Descriptions 2 Radioactivity Measurements for Sediments and Rocks 3 Descriptive Statisitics for Sediments and Rocks

List of Appendices

A Photographs of Waste Characterization Samples B Laboratory Report

DB23.1091 | TCD Waste Chrctrztn_814.docx 1

1. Introduction Daniel B. Stephens & Associates, Inc. (DBS&A) has prepared this report summarizing the results of waste characterization sampling for the Tuba City Dump (TCD) project in northern Arizona.

Samples were analyzed for radium isotopes to establish background levels and to compare field measurements of gamma radiation to laboratory measurements of radium isotopes.

Based on previous investigations, including a waste characterization investigation (DBS&A, 2007), remedial investigation (AMEC, 2015) and feasibility study (Amec Foster Wheeler, 2017) prepared for the Bureau of Indian Affairs (BIA), radioactive waste has not been detected at the TCD, and radiation levels within the TCD are at the same background levels as adjacent areas.

These investigations demonstrated that the waste from TCD contains naturally occurring radioactive material (NORM). Based on over 100 borings completed at TCD, the background concentration is typically less than 1 picocurie per gram (pCi/g) (DBS&A, 2007; AMEC, 2015).

Bedrock may have greater readings near 3 pCi/g (DBS&A, 2007).

The current project includes excavating the waste and hauling it to the WM facility at the Painted Desert Landfill near Joseph City, Arizona. This facility cannot accept waste that has radioactivity readings greater than 5 pCi/g for any given isotope. Our plan for any waste identified as hazardous or radioactive waste greater than 5 pCi/g is to segregate the waste for additional testing to determine the proper means of disposal and which facility may accept it.

These types of waste will be held on-site, and will not be shipped to the WM facility without authorization from WM.

Following excavation, the waste will be screened for radioactivity using a field meter (Geiger counter), which reads in millirem per hour (mrem/hr).

Laboratory measurements of radium isotopes were selected as indicators of natural conditions at TCD. The radium isotopes are part of the natural radioactive decay series of uranium (radium-226) or thorium (radium-228).

DBS&A collected and analyzed samples from the TCD site (Figure 1) to compare field measurements of gamma radiation with laboratory measurements of radium isotopes. The samples were measured with a Geiger counter and then submitted for laboratory analyses of radium isotopes. Photographs of collected samples are provided in Appendix A. Results of the

DB23.1091 | TCD Waste Chrctrztn_814.docx 2 study are discussed in the following sections, including correlation of field and laboratory results.

2. Methods DBS&A collected samples in 2024 and also used archived core samples from drilling in 2005 (Table 1). The samples collected this year are from locations across the site from the upper 1 foot of sediment. Samples were collected from within the waste cells and throughout the site representing typical sediment types at the TCD. These sediments are eroded from the Navajo Sandstone and have been incorporated into the waste cells. During previous studies, the composition of the waste was determined to be dominated by soil (DBS&A, 2007). As the site was an open dump, the waste was pushed into trenches and buried using the local sediments.

The archived rock samples have been stored in core boxes, and were collected in 2005 using an air-rotary drill rig during previous investigations (DBS&A, 2005). The samples are from local bedrock in the TCD area, including the Navajo Sandstone and Kayenta Formation. Due to the fine-grained nature and clay minerals in the Kayenta Formation, these rocks tend to have a greater gamma response compared to the Navajo Sandstone and sediments derived from the sandstone.

Our Geiger counter is a Berkeley Nucleonics palmRAD Model 907 (SN: 61780) and is calibrated for gamma radiation detection. The readings displayed are averaged over 30 seconds, typically with measurements every 3 seconds. For this study, a minimum of 60-second readings were taken to ensure statistical validity, and were taken approximately 1 centimeter (cm) from the sample.

After the sample radioactivity was measured with the Geiger counter, the samples were delivered under chain of custody to Eurofins Environment Testing (Eurofins) in Albuquerque, New Mexico for analysis of radium-226 using U.S. Environmental Protection Agency (EPA) method 903.0 and radium-228 using EPA method 904.0.

3. Results Data collected using the Geiger counter and laboratory results indicate low levels of background radiation for sediment and rock samples (Table 2). Geiger counter readings ranged from

DB23.1091 | TCD Waste Chrctrztn_814.docx 3

0.012 to 0.025 mrem/hr (Table 3 and Figure 2). The laboratory report is provided as Appendix B.

Laboratory results for radium-226 ranged from below detection limits to 3.56 pCi/g (Table 3 and Figure 2). All laboratory results for radium-228 were below detection limits (Table 2). All laboratory analytical results were below 4 pCi/g (Table 2).

When comparing the two methods for analyzing the radioactivity (Geiger counter for gamma readings and laboratory for radium-226), the sediment results have a moderate positive correlation of 0.44 (Table 3 and Figure 3). The rock samples have a weak positive correlation of

0.19 (Table 3 and Figure 3).

The linear trendline for the sediment sample data excluding non-detects values for the laboratory data is as follows:

radium-226 (pCi/g) = [6.6268 x Geiger reading (mrem/hr)] + 0.0689

The correlated threshold value for radioactivity was calculated using the linear trendline for sediments. Waste with field measurements at or greater than the threshold value will be separated for additional testing. The threshold value that correlates to 5 pCi/g of radium-226 is a reading of 0.744 mrem/hr with the Geiger counter.

4. Conclusions For sediments, which are expected to be the greatest volume of material removed from the TCD, the highest measured radium-226 activity was 0.254 pCi/g. Radium-226 was detected in sediments and rocks, indicating that decay of uranium is occurring at TCD. All radium-228 results were below sample detection limits, which may indicate that thorium decay products are not present in the samples.

The Geiger counter and laboratory results have a reasonable correlation for these background levels of radiation at TCD, indicating that the Geiger counter is a satisfactory field screening device. The threshold value that correlates to 5 pCi/g of radium-226 is a reading of

0.744 mrem/hr with the Geiger counter.

The observed values for radioactivity are consistent with previous investigations (DBS&A, 2007;

AMEC, 2015 and 2017). During the 2007 DBS&A waste characterization study, a composite sample from 79 borings had a radium-226 activity of 0.3 pCi/g and a radium-228 activity of <0.1 PCi/g (Table 5b in DBS&A, 2007).

DB23.1091 | TCD Waste Chrctrztn_814.docx 4

Anthropogenic activities at TCD have apparently not increased radiation levels above background.

References AMEC Environment & Infrastructure, Inc. (AMEC). 2015. Remedial investigation report, Tuba City

Dump Site, Tuba City, Arizona, Final. Submitted to Bureau of Indian Affairs Western Regional Office. May 1, 2015.

Amec Foster Wheeler, Environment & Infrastructure, Inc. (AMEC). 2017. Feasibility study report, Tuba City Dump Site, Tuba City Arizona, Final. Submitted to Bureau of Indian Affairs Western Regional Office. December 2017.

Berkeley Nucleonics. 2014. PalmRAD nuclear radiation monitor operating manual.

Daniel B. Stephens & Associates, Inc. (DBS&A). 2005. Geochemical forensics investigation, Tuba City Landfill. Prepared for the Hopi Tribe, Kykotsmovi, Arizona.

DBS&A. 2007. Waste characterization and expanded groundwater investigation, Tuba City Landfill. Prepared for the Hopi Tribe Department of Water Resources. December 3, 2007.

Figures

TCD_RC-01

TCD-RC-02

TCD_RC-03

TCD_RC-04

TCD_RC-05 TCD_RC-06

TCD_RC-07

TCD_RC-08

TCD_RC-09

TCD_RC-10

SB-1

SB-2

SB-3

S:\PROJECTS\DB23.1091_HOPI_TUBA_CITY_DUMP\GIS\ARCGIS_PRO\TUBA CITY DUMP\TUBA CITY DUMP.APRX

F igure 1

Aerial image: Maxar, Vivid 8/15/2021

Waste Characterization Sample Locations

HOPI TUBA CITY DUMP

6/4/2024

Explanation

Soil boring

0 200 400 ft

N

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HOPI TUBA CITY DUMP

Box Plots of Radium-226 in Sediments and Rock

Figure 2

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0.00

1.00

2.00

3.00

4.00

5.00

6.00

0.000 0.005 0.010 0.015 0.020 0.025 0.030

R ad iu m

-2

C on ce nt ra tio n (p

C i/g

Geiger Counter Reading (mrem/hour)

Sediment Rock

5 pCi/g Line Linear (Sediment)

HOPI TUBA CITY DUMP

Radioactivity Measurements in Sediments and Rocks

Figure 3

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Note: Plot excludes samples that were non-detect for radium-226.

Tables

Table 1. Waste Characterization Sample Descriptions

DB23.1091 | T01_Smpl Dscrptns.docx

Sample ID Type Sample Soil Group

Symbol Description Comment TCD_RC-01 Soil Grab SP Fine sand, pink (7.5 YR 7/4), subangular, quartz, poorly graded, not cemented, dry, 0–1 foot

TCD_RC-02 Soil Grab SP Fine sand, red (2.5 YR 5/6), subangular, quartz, poorly sorted, not cemented, dry, roots

0–1 foot

TCD_RC-03 Soil Grab SP Fine sand, red (2.5 YR 5/6), subangular, quartz, poorly sorted, not cemented, dry, roots

0–1 foot

TCD_RC-04 Soil Grab SP Fine sand, light brown (7.5 YR 6/4), subangular, quartz, poorly sorted, not cemented, dry, roots, minor sandstone gravel

0–1 foot

TCD_RC-05 Soil Grab SP Fine sand (dark reddish brown (2.5 YR 3/4), mixed with ash and charcoal, subangular, quartz, poorly sorted, not cemented, dry, roots, soil peds are

2.5 YR 5/6 when broken up, broken glass

0–1 foot

TCD_RC-06 Soil Grab SP Fine sand, yellowish red (5 YR 5/6), subangular, quartz, poorly sorted, not cemented, dry, roots, ash, charcoal, and cardboard

0–1 foot

TCD_RC-07 Soil Grab SP Fine sand, yellowish red (5 YR 5/8), subangular, quartz, poorly sorted, not cemented, dry, roots

0–1 foot

TCD_RC-08 Soil Grab SP Fine sand, reddish yellow (5 YR 5/6), subangular, quartz, poorly sorted, not cemented, dry, roots

0–1 foot

TCD_RC-09 Soil Grab SP Fine sand, reddish yellow (5 YR 6/8), subangular, quartz, poorly sorted, not cemented, dry, roots (gravel 10%, coarse sand, 15%, medium sand 10%, fine sand 60%, fines 5%), gravel up to 1 inch (green and black lithic framents)

0–1 foot

TCD_RC-10 Soil Grab SP Fine sand, pink (7.5 YR 7/4), subangular, quartz, poorly graded, not cemented, dry, 0–1 foot

TCD_RC-11 Rock Core SP Sandstone, light red (2.5 YR 6/6), fine sand, subangular, quartz, poorly graded, cemented, dry, sandstone

SB-3 15–18 feet

Table 1. Waste Characterization Sample Descriptions

DB23.1091 | T01_Smpl Dscrptns.docx

Sample ID Type Sample Soil Group

Symbol Description Comment TCD_RC-12 Rock Core SP Sandstone, white (7.5 YR 1/1), fine sand, subangular, quartz, poorly graded, cemented, dry, sandstone

SB-3 12–

12.4 feet

TCD_RC-13 Rock Core SP Sandstone, pink (7.5 YR 7/4), fine sand, subangular, quartz, poorly graded, cemented, dry, sandstone

SB-1 20–24 feet

TCD_RC-14 Rock Core SP Sandstone, pink (7.5 YR 7/4), fine sand, subangular, quartz, poorly graded, cemented, dry, sandstone

SB-1 30–32 feet

TCD_RC-15 Rock Core SP Clayey Sandstone, light reddish brown (2.5 YR 7/4), fine sand with clay, subangular, quartz, poorly graded, cemented, dry

SB-2 14 feet

Table 2. Radioactivity Measurements for Sediments and Rocks

DB23.1091 | T02_Results.docx

Geiger Counter Reading Laboratory Data (pCi/g) Sample ID Type mrem/hr µrem/hr Radium-226 Radium-228

TCD_RC-01 Sediment 0.017 17 <0.234 <1.24 TCD_RC-02 Sediment 0.016 16 0.186 <0.551 TCD_RC-03 Sediment 0.020 20 0.245 <0.487 TCD_RC-04 Sediment 0.018 18 0.237 <1.01 TCD_RC-05 Sediment 0.020 20 0.215 <0.502 TCD_RC-06 Sediment 0.012 12 0.132 <0.558 TCD_RC-07 Sediment 0.025 25 <0.177 <1.20 TCD_RC-08 Sediment 0.016 16 <0.128 <0.741 TCD_RC-09 Sediment 0.012 12 0.218 <0.974 TCD_RC-10 Sediment 0.020 20 0.187 <0.830 TCD_RC-11 Rock 0.022 22 0.232 <0.584 TCD_RC-12 Rock 0.017 17 0.129 <0.777 TCD_RC-13 Rock 0.019 19 0.124 <0.574 TCD_RC-14 Rock 0.020 20 1.24 <0.480 TCD_RC-15 Rock 0.020 20 3.56 <0.586 mrem/hr = Millirems per hour µrem/hr = Microrems per hour pCi/g = Picocuries per gram

DB23.1091 | T03_Statistics.docx

Table 3. Descriptive Statistics for Sediments and Rocks

Sediment Rock

Statistic

Geiger Counter

(mrem/hr) Radium-226

(pCi/g)

Geiger Counter

(mrem/hr) Radium-226

(pCi/g) Mean 0.018 0.181 0.020 1.06 Standard deviation 0.004 0.055 0.002 1.48 Minimum a 0.012 0.102 0.017 0.124 Maximum 0.025 0.245 0.022 3.56 Count 10 7 5 5 Correlation a 0.44 0.19 a Excludes samples that were non-detect for radium-226.

mrem/hr = Millirems per hour pCi/g = Picocuries per gram

Appendix A

Photographs of

Samples

Photographs

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1. TCD_RC-01 fine sand, grab sample 2. TCD_RC-02 fine sand, grab sample

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3. TCD_RC-03 fine sand, grab sample 4. TCD_RC-04 fine sand, grab sample

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5. TCD_RC-05 fine sand, grab sample 6. TCD_RC-06 fine sand, grab sample

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7. TCD_RC-07 fine sand, grab sample 8. TCD_RC-08 fine sand, grab sample

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9. TCD_RC-09 fine sand, grab sample 10. TCD_RC-10 fine sand, grab sample

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11. TCD_RC-11 sandstone, core sample 12. TCD_RC-12 sandstone, core sample

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13. TCD_RC-13 sandstone, core sample 12. TCD_RC-14 sandstone, core sample

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15. TCD_RC-15 sandstone, core sample

Appendix B

Laboratory Report

ANALYTICAL REPORT

PREPARED FOR

Attn: Chris Wolf

Daniel B. Stephens & Associates Inc.

6020 Academy Road NE

Suite 100 Albuquerque, New Mexico 87109

Generated 4/30/2024 10:04:27 AM

JOB DESCRIPTION

Tuba City Dump

JOB NUMBER

885-1977-1

See page two for job notes and contact information.

Albuquerque NM 87109 4901 Hawkins NE Eurofins Albuquerque https://eol.et.eurofinsus.com/myEOL/

Eurofins Albuquerque

Job Notes

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 South Central, LLC Project Manager.

Authorization

Generated

4/30/2024 10:04:27 AM

Authorized for release by Cheyenne Cason, Project Manager cheyenne.cason@et.eurofinsus.com Designee for Tiffany Shaw, Project Manager I tiffany.shaw@et.eurofinsus.comtiffany.shaw@et.eurofinsus.com (505)345-3975

Page 2 of 35 4/30/2024

Table of Contents

Client: Daniel B. Stephens & Associates Inc.

Project/Site: Tuba City Dump

Laboratory Job ID: 885-1977-1

Eurofins Albuquerque

4/30/2024

Cover Page

Table of Contents

Definitions/Glossary

Case Narrative

Client Sample Results

Tracer Carrier Summary

QC Sample Results

QC Association Summary

Lab Chronicle

Certification Summary

Chain of Custody

Receipt Checklists

Definitions/Glossary Job ID: 885-1977-1Client: Daniel B. Stephens & Associates Inc.

Project/Site: Tuba City Dump

Qualifiers

Rad Qualifier Description

G The Sample MDC is greater than the requested RL.

Qualifier

U Result is less than the sample detection limit.

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 Albuquerque

Page 4 of 35 4/30/2024

Job Narrative 885-1977-1

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 are applied to indicate exceptions. Noncompliant quality control (QC) is further explained in narrative comments.

Matrix QC may not be reported if insufficient sample 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 3/27/2024 4:06 PM. 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 23.0°C.

Gas Flow Proportional Counter Method 903.0: Radium-226 Prep Batch 654993

The sample results for TCD_RC-01 (885-1977-1), TCD_RC-02 (885-1977-2), TCD_RC-03 (885-1977-3), TCD_RC-04 (885-1977-4), TCD_RC-05 (885-1977-5), TCD_RC-06 (885-1977-6), TCD_RC-07 (885-1977-7), TCD_RC-08 (885-1977-8), TCD_RC-09 (885-1977-9), TCD_RC-10 (885-1977-10), TCD_RC-11 (885-1977-11), TCD_RC-12 (885-1977-12), TCD_RC-13 (885-1977-13), TCD_RC-14 (885-1977-14), TCD_RC-15 (885-1977-15) and (885-1977-A-1 DU) are based upon sample as received (i.e. wet weight).

Method 904.0: Radium-228 Prep Batch 655008

The sample results for TCD_RC-01 (885-1977-1), TCD_RC-02 (885-1977-2), TCD_RC-03 (885-1977-3), TCD_RC-04 (885-1977-4), TCD_RC-05 (885-1977-5), TCD_RC-06 (885-1977-6), TCD_RC-07 (885-1977-7), TCD_RC-08 (885-1977-8), TCD_RC-09 (885-1977-9), TCD_RC-10 (885-1977-10), TCD_RC-11 (885-1977-11), TCD_RC-12 (885-1977-12), TCD_RC-13 (885-1977-13), TCD_RC-14 (885-1977-14), TCD_RC-15 (885-1977-15) and (885-1977-A-1 DU) are based upon sample as received (i.e. wet weight).

Method 904.0: Radium-228 prep batch 160-655008:

The detection goal was not met for the following samples due lower, but still within acceptance limit, carrier recovery: TCD_RC-01 (885-1977-1), TCD_RC-04 (885-1977-4), TCD_RC-07 (885-1977-7) and (885-1977-A-1-D DU). Analytical results are reported with the detection limit achieved.

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

Case Narrative Client: Daniel B. Stephens & Associates Inc. Job ID: 885-1977-1 Project: Tuba City Dump

Eurofins Albuquerque

Job ID: 885-1977-1 Eurofins Albuquerque

Page 5 of 35 4/30/2024

Client Sample Results

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-1Client Sample ID: TCD_RC-01 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.208 U

(2σ+/-)

0.162

(2σ+/-)

104/28/24 12:3504/02/24 10:03pCi/g0.2341.00

RL MDC

0.161

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/28/24 12:35 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

37.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

1.06 U G

(2σ+/-)

0.822

(2σ+/-)

104/18/24 11:5604/02/24 10:54pCi/g1.241.00

RL MDC

0.816

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:56 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

37.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:56 174.8

Eurofins Albuquerque

Page 6 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-2Client Sample ID: TCD_RC-02 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.186

(2σ+/-)

0.0898

(2σ+/-)

104/28/24 12:4904/02/24 10:03pCi/g0.1001.00

RL MDC

0.0882

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/28/24 12:49 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

88.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.321 U

(2σ+/-)

0.341

(2σ+/-)

104/18/24 11:5604/02/24 10:54pCi/g0.5511.00

RL MDC

0.340

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:56 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

88.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:56 175.5

Eurofins Albuquerque

Page 7 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-3Client Sample ID: TCD_RC-03 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.245

(2σ+/-)

0.106

(2σ+/-)

104/29/24 09:0404/02/24 10:03pCi/g0.1291.00

RL MDC

0.104

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 09:04 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

94.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

-0.0882 U

(2σ+/-)

0.243

(2σ+/-)

104/18/24 11:5604/02/24 10:54pCi/g0.4871.00

RL MDC

0.243

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:56 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

94.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:56 178.5

Eurofins Albuquerque

Page 8 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-4Client Sample ID: TCD_RC-04 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.237

(2σ+/-)

0.156

(2σ+/-)

104/29/24 09:0404/02/24 10:03pCi/g0.2171.00

RL MDC

0.154

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 09:04 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

49.8

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.921 U G

(2σ+/-)

0.672

(2σ+/-)

104/18/24 11:5604/02/24 10:54pCi/g1.011.00

RL MDC

0.666

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:56 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

49.8

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:56 179.3

Eurofins Albuquerque

Page 9 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-5Client Sample ID: TCD_RC-05 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.215

(2σ+/-)

0.0938

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1071.00

RL MDC

0.0918

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

96.5

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.181 U

(2σ+/-)

0.294

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.5021.00

RL MDC

0.293

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

96.5

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 176.6

Eurofins Albuquerque

Page 10 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-6Client Sample ID: TCD_RC-06 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.132

(2σ+/-)

0.0854

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1181.00

RL MDC

0.0845

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

89.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.206 U

(2σ+/-)

0.328

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.5581.00

RL MDC

0.327

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

89.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 179.3

Eurofins Albuquerque

Page 11 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-7Client Sample ID: TCD_RC-07 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.126 U

(2σ+/-)

0.117

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1771.00

RL MDC

0.116

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

43.0

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

1.18 U G

(2σ+/-)

0.811

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g1.201.00

RL MDC

0.804

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

43.0

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 172.1

Eurofins Albuquerque

Page 12 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-8Client Sample ID: TCD_RC-08 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.0944 U

(2σ+/-)

0.0849

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1281.00

RL MDC

0.0845

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

65.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.731 U

(2σ+/-)

0.504

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.7411.00

RL MDC

0.500

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

65.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 175.5

Eurofins Albuquerque

Page 13 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-9Client Sample ID: TCD_RC-09 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.218

(2σ+/-)

0.117

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1471.00

RL MDC

0.115

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

61.8

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.770 U

(2σ+/-)

0.632

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.9741.00

RL MDC

0.629

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

61.8

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 161.7

Eurofins Albuquerque

Page 14 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-10Client Sample ID: TCD_RC-10 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.187

(2σ+/-)

0.0904

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1021.00

RL MDC

0.0888

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

80.5

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.323 U

(2σ+/-)

0.490

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.8301.00

RL MDC

0.489

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

80.5

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 158.7

Eurofins Albuquerque

Page 15 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-11Client Sample ID: TCD_RC-11 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.232

(2σ+/-)

0.0988

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1101.00

RL MDC

0.0965

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

90.0

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.261 U

(2σ+/-)

0.350

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.5841.00

RL MDC

0.349

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

90.0

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 169.5

Eurofins Albuquerque

Page 16 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-12Client Sample ID: TCD_RC-12 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.129

(2σ+/-)

0.0918

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.1281.00

RL MDC

0.0911

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

72.0

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.227 U

(2σ+/-)

0.447

(2σ+/-)

104/18/24 11:5704/02/24 10:54pCi/g0.7771.00

RL MDC

0.446

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:57 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

72.0

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:57 168.0

Eurofins Albuquerque

Page 17 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-13Client Sample ID: TCD_RC-13 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

0.124

(2σ+/-)

0.0768

(2σ+/-)

104/29/24 08:5404/02/24 10:03pCi/g0.09871.00

RL MDC

0.0760

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 08:54 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

81.3

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.376 U

(2σ+/-)

0.361

(2σ+/-)

104/18/24 11:4204/02/24 10:54pCi/g0.5741.00

RL MDC

0.359

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:42 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

81.3

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:42 181.5

Eurofins Albuquerque

Page 18 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-14Client Sample ID: TCD_RC-14 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

1.24

(2σ+/-)

0.216

(2σ+/-)

104/29/24 11:1404/02/24 10:03pCi/g0.1051.00

RL MDC

0.185

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 11:14 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

93.8

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.423 U

(2σ+/-)

0.320

(2σ+/-)

104/18/24 11:4204/02/24 10:54pCi/g0.4801.00

RL MDC

0.318

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:42 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

93.8

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:42 176.3

Eurofins Albuquerque

Page 19 of 35 4/30/2024

Project/Site: Tuba City Dump

Lab Sample ID: 885-1977-15Client Sample ID: TCD_RC-15 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Method: EPA 903.0 - Radium-226 (GFPC)

Analyte

3.56

(2σ+/-)

0.458

(2σ+/-)

104/29/24 11:1404/02/24 10:03pCi/g0.1051.00

RL MDC

0.328

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-226

Ba Carrier 30 - 110

Carrier

04/02/24 10:03 04/29/24 11:14 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

74.8

Method: EPA 904.0 - Radium-228 (GFPC)

Analyte

0.148 U

(2σ+/-)

0.333

(2σ+/-)

104/18/24 11:4204/02/24 10:54pCi/g0.5861.00

RL MDC

0.333

Dil FacAnalyzedPreparedUnitResult Qualifier

Count Total

Uncert. Uncert.

Radium-228

Ba Carrier 30 - 110

Carrier

04/02/24 10:54 04/18/24 11:42 1

Dil FacAnalyzedPreparedQualifier Limits%Yield

74.8

Y Carrier 30 - 110 04/02/24 10:54 04/18/24 11:42 179.3

Eurofins Albuquerque

Page 20 of 35 4/30/2024

Tracer/Carrier Summary

Project/Site: Tuba City Dump

Method: 903.0 - Radium-226 (GFPC) Prep Type: Total/NAMatrix: Solid

Lab Sample ID Client Sample ID (30-110)

Ba

37.3885-1977-1

Percent Yield (Acceptance Limits)

TCD_RC-01

32.0885-1977-1 DU TCD_RC-01

88.3885-1977-2 TCD_RC-02

94.3885-1977-3 TCD_RC-03

49.8885-1977-4 TCD_RC-04

96.5885-1977-5 TCD_RC-05

89.3885-1977-6 TCD_RC-06

43.0885-1977-7 TCD_RC-07

65.3885-1977-8 TCD_RC-08

61.8885-1977-9 TCD_RC-09

80.5885-1977-10 TCD_RC-10

90.0885-1977-11 TCD_RC-11

72.0885-1977-12 TCD_RC-12

81.3885-1977-13 TCD_RC-13

93.8885-1977-14 TCD_RC-14

74.8885-1977-15 TCD_RC-15

95.8LCS 160-654993/2-A Lab Control Sample

99.8MB 160-654993/1-A Method Blank

Tracer/Carrier Legend

Ba = Ba Carrier

Method: 904.0 - Radium-228 (GFPC) Prep Type: Total/NAMatrix: Solid

Lab Sample ID Client Sample ID (30-110) (30-110)

Ba Y

37.3 74.8885-1977-1

Percent Yield (Acceptance Limits)

TCD_RC-01

32.0 73.6885-1977-1 DU TCD_RC-01

88.3 75.5885-1977-2 TCD_RC-02

94.3 78.5885-1977-3 TCD_RC-03

49.8 79.3885-1977-4 TCD_RC-04

96.5 76.6885-1977-5 TCD_RC-05

89.3 79.3885-1977-6 TCD_RC-06

43.0 72.1885-1977-7 TCD_RC-07

65.3 75.5885-1977-8 TCD_RC-08

61.8 61.7885-1977-9 TCD_RC-09

80.5 58.7885-1977-10 TCD_RC-10

90.0 69.5885-1977-11 TCD_RC-11

72.0 68.0885-1977-12 TCD_RC-12

81.3 81.5885-1977-13 TCD_RC-13

93.8 76.3885-1977-14 TCD_RC-14

74.8 79.3885-1977-15 TCD_RC-15

95.8 76.6LCS 160-655008/2-A Lab Control Sample

99.8 83.0MB 160-655008/1-A Method Blank

Tracer/Carrier Legend

Ba = Ba Carrier

Y = Y Carrier

Eurofins Albuquerque

Page 21 of 35 4/30/2024

QC Sample Results

Project/Site: Tuba City Dump

Method: 903.0 - Radium-226 (GFPC)

Client Sample ID: Method BlankLab Sample ID: MB 160-654993/1-A Matrix: Solid Prep Type: Total/NA Analysis Batch: 658963 Prep Batch: 654993

Radium-226

Analyte

U 104/28/24 12:3504/02/24 10:03pCi/g0.0971

MDC

1.00

RL

0.04850.0485

(2σ+/-) (2σ+/-)

MB

0.006028

MB

Dil FacPrepared AnalyzedUnitResult Qualifier

Uncert.

Count

Uncert.

Total

Carrier

Ba Carrier 30 - 110 04/02/24 10:03 04/28/24 12:35 1

Dil FacPrepared AnalyzedQualifier Limits%Yield

99.8

MB MB

Client Sample ID: Lab Control SampleLab Sample ID: LCS 160-654993/2-A Matrix: Solid Prep Type: Total/NA Analysis Batch: 658963 Prep Batch: 654993

Radium-226

Analyte

125-759010.1911.3 1.06 1.00 0.0713

RL MDC(2σ+/-)

LCS LCS

pCi/g

UnitResult Qual %RecAdded

Spike

Limits

%RecUncert.

Total

Ba Carrier

Carrier

30 - 110

LCS

Qualifier Limits%Yield

95.8

LCS

Client Sample ID: TCD_RC-01Lab Sample ID: 885-1977-1 DU Matrix: Solid Prep Type: Total/NA Analysis Batch: 659061 Prep Batch: 654993

Radium-226

Analyte

10.42U0.073120.208 U 0.161 1.00 0.291

RL MDC(2σ+/-)

DU DU

pCi/g

UnitResult Qual LimitResult

Sample Sample

Qual

Uncert.

Total

RER

RER

Ba Carrier

Carrier

30 - 110

DU

Qualifier Limits%Yield

32.0

DU

Method: 904.0 - Radium-228 (GFPC)

Client Sample ID: Method BlankLab Sample ID: MB 160-655008/1-A Matrix: Solid Prep Type: Total/NA Analysis Batch: 657622 Prep Batch: 655008

Radium-228

Analyte

U 104/18/24 11:5604/02/24 10:54pCi/g0.468

MDC

1.00

RL

0.2590.259

(2σ+/-) (2σ+/-)

MB

0.06920

MB

Dil FacPrepared AnalyzedUnitResult Qualifier

Uncert.

Count

Uncert.

Total

Carrier

Ba Carrier 30 - 110 04/02/24 10:54 04/18/24 11:56 1

Dil FacPrepared AnalyzedQualifier Limits%Yield

99.8

MB MB

04/02/24 10:54 04/18/24 11:56 1Y Carrier 83.0 30 - 110

Eurofins Albuquerque

Page 22 of 35 4/30/2024

QC Sample Results

Project/Site: Tuba City Dump

Method: 904.0 - Radium-228 (GFPC) (Continued)

Client Sample ID: Lab Control SampleLab Sample ID: LCS 160-655008/2-A Matrix: Solid Prep Type: Total/NA Analysis Batch: 657622 Prep Batch: 655008

Radium-228

Analyte

125-751079.6499.02 1.33 1.00 0.591

RL MDC(2σ+/-)

LCS LCS

pCi/g

UnitResult Qual %RecAdded

Spike

Limits

%RecUncert.

Total

Ba Carrier

Carrier

30 - 110

LCS

Qualifier Limits%Yield

95.8

LCS

Y Carrier 76.6 30 - 110

Client Sample ID: TCD_RC-01Lab Sample ID: 885-1977-1 DU Matrix: Solid Prep Type: Total/NA Analysis Batch: 657622 Prep Batch: 655008

Radium-228

Analyte

10U G1.0621.06 U G 0.935 1.00 1.45

RL MDC(2σ+/-)

DU DU

pCi/g

UnitResult Qual LimitResult

Sample Sample

Qual

Uncert.

Total

RER

RER

Ba Carrier

Carrier

30 - 110

DU

Qualifier Limits%Yield

32.0

DU

Y Carrier 73.6 30 - 110

Eurofins Albuquerque

Page 23 of 35 4/30/2024

QC Association Summary

Project/Site: Tuba City Dump

Rad

Prep Batch: 654993

Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch

Solid DPS-21885-1977-1 TCD_RC-01 Total/NA

Solid DPS-21885-1977-2 TCD_RC-02 Total/NA

Solid DPS-21885-1977-3 TCD_RC-03 Total/NA

Solid DPS-21885-1977-4 TCD_RC-04 Total/NA

Solid DPS-21885-1977-5 TCD_RC-05 Total/NA

Solid DPS-21885-1977-6 TCD_RC-06 Total/NA

Solid DPS-21885-1977-7 TCD_RC-07 Total/NA

Solid DPS-21885-1977-8 TCD_RC-08 Total/NA

Solid DPS-21885-1977-9 TCD_RC-09 Total/NA

Solid DPS-21885-1977-10 TCD_RC-10 Total/NA

Solid DPS-21885-1977-11 TCD_RC-11 Total/NA

Solid DPS-21885-1977-12 TCD_RC-12 Total/NA

Solid DPS-21885-1977-13 TCD_RC-13 Total/NA

Solid DPS-21885-1977-14 TCD_RC-14 Total/NA

Solid DPS-21885-1977-15 TCD_RC-15 Total/NA

Solid DPS-21MB 160-654993/1-A Method Blank Total/NA

Solid DPS-21LCS 160-654993/2-A Lab Control Sample Total/NA

Solid DPS-21885-1977-1 DU TCD_RC-01 Total/NA

Prep Batch: 655008

Lab Sample ID Client Sample ID Prep Type Matrix Method Prep Batch

Solid DPS-0885-1977-1 TCD_RC-01 Total/NA

Solid DPS-0885-1977-2 TCD_RC-02 Total/NA

Solid DPS-0885-1977-3 TCD_RC-03 Total/NA

Solid DPS-0885-1977-4 TCD_RC-04 Total/NA

Solid DPS-0885-1977-5 TCD_RC-05 Total/NA

Solid DPS-0885-1977-6 TCD_RC-06 Total/NA

Solid DPS-0885-1977-7 TCD_RC-07 Total/NA

Solid DPS-0885-1977-8 TCD_RC-08 Total/NA

Solid DPS-0885-1977-9 TCD_RC-09 Total/NA

Solid DPS-0885-1977-10 TCD_RC-10 Total/NA

Solid DPS-0885-1977-11 TCD_RC-11 Total/NA

Solid DPS-0885-1977-12 TCD_RC-12 Total/NA

Solid DPS-0885-1977-13 TCD_RC-13 Total/NA

Solid DPS-0885-1977-14 TCD_RC-14 Total/NA

Solid DPS-0885-1977-15 TCD_RC-15 Total/NA

Solid DPS-0MB 160-655008/1-A Method Blank Total/NA

Solid DPS-0LCS 160-655008/2-A Lab Control Sample Total/NA

Solid DPS-0885-1977-1 DU TCD_RC-01 Total/NA

Eurofins Albuquerque

Page 24 of 35 4/30/2024

Lab Chronicle Client: Daniel B. Stephens & Associates Inc. Job ID: 885-1977-1 Project/Site: Tuba City Dump

Client Sample ID: TCD_RC-01 Lab Sample ID: 885-1977-1 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 658963 SCB EET SLTotal/NA 04/28/24 12:35

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:56

Client Sample ID: TCD_RC-02 Lab Sample ID: 885-1977-2 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659061 SCB EET SLTotal/NA 04/28/24 12:49

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:56

Client Sample ID: TCD_RC-03 Lab Sample ID: 885-1977-3 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659075 SWS EET SLTotal/NA 04/29/24 09:04

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:56

Client Sample ID: TCD_RC-04 Lab Sample ID: 885-1977-4 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659075 SWS EET SLTotal/NA 04/29/24 09:04

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:56

Client Sample ID: TCD_RC-05 Lab Sample ID: 885-1977-5 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Eurofins Albuquerque

Page 25 of 35 4/30/2024

Project/Site: Tuba City Dump

Client Sample ID: TCD_RC-06 Lab Sample ID: 885-1977-6 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-07 Lab Sample ID: 885-1977-7 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-08 Lab Sample ID: 885-1977-8 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-09 Lab Sample ID: 885-1977-9 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-10 Lab Sample ID: 885-1977-10 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Eurofins Albuquerque

Page 26 of 35 4/30/2024

Project/Site: Tuba City Dump

Client Sample ID: TCD_RC-11 Lab Sample ID: 885-1977-11 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-12 Lab Sample ID: 885-1977-12 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657622 EMH EET SLTotal/NA 04/18/24 11:57

Client Sample ID: TCD_RC-13 Lab Sample ID: 885-1977-13 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 08:54

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657471 SWS EET SLTotal/NA 04/18/24 11:42

Client Sample ID: TCD_RC-14 Lab Sample ID: 885-1977-14 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 11:14

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657471 SWS EET SLTotal/NA 04/18/24 11:42

Client Sample ID: TCD_RC-15 Lab Sample ID: 885-1977-15 Matrix: SolidDate Collected: 03/26/24 00:00

Date Received: 03/27/24 16:06

Prep DPS-21 CJK654993 EET SL

Type

Batch Batch

MethodPrep Type LabAnalystRun

Prepared or Analyzed

Batch

Number

Dilution

Factor

Total/NA 04/02/24 10:03

Analysis 903.0 1 659076 SCB EET SLTotal/NA 04/29/24 11:14

Prep DPS-0 655008 CJK EET SLTotal/NA 04/02/24 10:54

Analysis 904.0 1 657471 SWS EET SLTotal/NA 04/18/24 11:42

Eurofins Albuquerque

Page 27 of 35 4/30/2024

Project/Site: Tuba City Dump

Laboratory References:

EET SL = Eurofins St. Louis, 13715 Rider Trail North, Earth City, MO 63045, TEL (314)298-8566

Eurofins Albuquerque

Page 28 of 35 4/30/2024

Accreditation/Certification Summary

Project/Site: Tuba City Dump

Laboratory: Eurofins St. Louis All accreditations/certifications held by this laboratory are listed. Not all accreditations/certifications are applicable to this report.

Authority Program Identification Number Expiration Date

Alaska (UST) State 20-001 05-06-25

ANAB Dept. of Defense ELAP L2305 04-06-25

ANAB Dept. of Energy L2305.01 04-08-25

ANAB ISO/IEC 17025 L2305 04-06-25

Arizona State AZ0813 12-08-24

California Los Angeles County Sanitation

Districts

10259 06-30-22 *

California State 2886 06-30-24

Connecticut State PH-0241 03-31-25

Florida NELAP E87689 06-30-24

HI - RadChem Recognition State n/a 06-30-24

Illinois NELAP 200023 11-30-24

Iowa State 373 12-01-24

Kansas NELAP E-10236 10-31-24

Kentucky (DW) State KY90125 12-31-24

Kentucky (WW) State KY90125 (Permit

KY0004049)

12-31-24

Louisiana NELAP 04080 06-30-22 *

Louisiana (All) NELAP 04080 06-30-24

Louisiana (DW) State LA011 12-31-24

Maryland State 310 09-30-24

Massachusetts State M-MO054 06-30-24

MI - RadChem Recognition State 9005 06-30-24

Missouri State 780 06-30-25

Nevada State MO00054 07-31-24

New Jersey NELAP MO002 06-30-24

New Mexico State MO00054 06-30-24

New York NELAP 11616 03-31-25

North Carolina (DW) State 29700 07-31-24

North Dakota State R-207 06-30-24

Oklahoma NELAP 9997 08-31-24

Oregon NELAP 4157 09-01-24

Pennsylvania NELAP 68-00540 02-28-25

South Carolina State 85002001 06-30-24

Texas NELAP T104704193 07-31-24

US Fish & Wildlife US Federal Programs 058448 07-31-24

USDA US Federal Programs P330-17-00028 05-18-26

Utah NELAP MO00054 07-31-24

Virginia NELAP 10310 06-15-25

Washington State C592 08-30-24

West Virginia DEP State 381 10-31-24

Eurofins Albuquerque

* Accreditation/Certification renewal pending - accreditation/certification considered valid.

Page 29 of 35 4/30/2024

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Login Sample Receipt Checklist

Client: Daniel B. Stephens & Associates Inc. Job Number: 885-1977-1

Login Number: 1977

Question Answer Comment

Creator: McQuiston, Steven

List Source: Eurofins Albuquerque

List Number: 1

N/AThe cooler's custody seal, if present, is intact.

N/ASample custody seals, if present, are intact.

TrueThe cooler or samples do not appear to have been compromised or tampered with.

FalseSamples were received on ice. Thermal preservation not required.

TrueCooler Temperature is acceptable.

TrueCooler Temperature is recorded.

TrueCOC is present.

TrueCOC is filled out in ink and legible.

TrueCOC is filled out with all pertinent information.

TrueIs the Field Sampler's name present on COC?

TrueThere are no discrepancies between the containers received and the COC.

TrueSamples are received within Holding Time (excluding tests with immediate HTs)

TrueSample containers have legible labels.

TrueContainers are not broken or leaking.

TrueSample collection date/times are provided.

TrueAppropriate sample containers are used.

TrueSample bottles are completely filled.

TrueSample Preservation Verified.

N/AThere is sufficient vol. for all requested analyses, incl. any requested MS/MSDs

N/AContainers requiring zero headspace have no headspace or bubble is <6mm (1/4").

N/ATCEQ Mtd 1005 soil sample was frozen/delivered for prep within 48H of sampling.

Eurofins Albuquerque Page 34 of 35 4/30/2024

Login Sample Receipt Checklist

Client: Daniel B. Stephens & Associates Inc. Job Number: 885-1977-1

Login Number: 1977

Question Answer Comment

Creator: Worthington, Sierra M

List Source: Eurofins St. Louis

List Creation: 03/29/24 11:56 AMList Number: 2

TrueRadioactivity wasn't checked or is </= background as measured by a survey meter.

TrueThe cooler's custody seal, if present, is intact.

TrueSample custody seals, if present, are intact.

TrueThe cooler or samples do not appear to have been compromised or…