Tronox Navajo Area Uranium Mines
Northern Abandoned Uranium Mine Region
Final
Full Year Analytical Report
Cove Air Study
February 17, 2023
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TETRA TECH
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Tronox Navajo Area Uranium Mines
Northern Abandoned Uranium Mine Region
Final
Full Year Analytical Report
Cove Air Study
Response, Assessment, and Evaluation Services
Contract No. EP-S9-17-03
Task Order 0012
February 17, 2023
Submitted to
U.S. Environmental Protection Agency
Submitted by
Tetra Tech, Inc.
1999 Harrison Street, Suite 500
Oakland, CA 94612
TETRA TECH
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Full Year Analytical Report, Cove Air Study
TABLE OF CONTENTS
Section Page
ACRONYMS AND ABBREVIATIONS IV
EXECUTIVE SUMMARY 1
1.0 INTRODUCTION 1
2.0 FIELD SAMPLING 2
2.1 RADIONUCLIDE SAMPLING 2
2.2 METALS AND PM25 SAMPLING 3
2.3 METEOROLOGICAL STATION DATA 3
3.0 RADIONUCLIDE RESULTS 4
3.1 RADIONUCLIDE ANALYTICAL METHODS 4
3.2 RADIONUCLIDE FIELD SAMPLE RESULTS 4
3.3 RADIONUCLIDE FIELD QUALITY CONTROL RESULTS 5
3.4 RADIONUCLIDE RESULT QUALIFICATIONS 6
4.0 METALS AND PM25 RESULTS 7
4.1 METALS AND PM25 ANALYTICAL METHODS 7
4.2 METALS AND PM25 FIELD SAMPLE RESULTS 7
4.3 METALS AND PM2 5 FIELD QUALITY CONTROL RESULTS 7
5.0 METEOROLOGICAL DATA 9
5.1 METEOROLOGICAL DATA SUMMARY TABLES 10
5.2 WIND ROSE PLOTS 10
6.0 DATA USABILITY 11
6.1 PRECISION 11
6.2 ACCURACY 11
6.3 REPRESENTATIVENESS 12
6.4 COMPARABILITY 13
6.5 COMPLETENESS 13
6.6 SENSITIVITY 14
7.0 REFERENCES 15
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FIGURES
Figure 1. Air Sampling Station Locations
Figure 2. Radium-226 Results
Figure 3. Uranium-234 Results
Figure 4. Uranium-23 8 Results
Figure 5. PM2.5 Results
Figure 6. Arsenic Results
Figure 7. Barium Results
Figure 8. Lead Results
Figure 9. Molybdenum Results
Figure 10. Selenium Results
Figure 11. Uranium Results
Figure 12. Vanadium Results
Figure 13. Wind Roses, All Radionuclide Sampling Events
Figure 14. Wind Roses, PM2.5 and Metals Sampling Events
Figure 15. Spatial Representativeness Summary
Figure 16. Temporal Representativeness - Averaged Hourly Wind Speed
Figure 17. Temporal Representativeness - Maximum Hourly Wind Speed
Figure 18. Temporal Representativeness - Averaged Hourly Vector Wind Direction
Figure 19. Temporal Representativeness - Averaged PM2.5 Concentration
Figure 20. Temporal Representativeness - Averaged Arsenic Concentration
Figure 21. Temporal Representativeness - Averaged Barium Concentration
Figure 22. Temporal Representativeness - Averaged Molybdenum Concentration
Figure 23. Temporal Representativeness - Averaged Lead Concentration
Figure 24. Temporal Representativeness - Averaged Vanadium Concentration
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TABLES
Table 1. Field Sampling Summary - Radionuclides
Table 2. Field Sampling Summary - Metals and PM2.5
Table 3. Summary Statistics - Radionuclides, All Cove Stations
Table 4. Summary Statistics - Radionuclides, by Analyte and Station
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable Concentration
Table 6. Radionuclide Field Duplicate Result Summary
Table 7. Summary Statistics - Metals and PM2.5, All Cove Stations
Table 8. Summary Statistics - Metals and PM2.5, by Analyte and Station
Table 9. Metal and PM2.5 Field Blank Detections Above the Reporting Limit
Table 10. Metal and PM2.5 Field Duplicate Result Summary
Table 11. Meteorological Summary for Radionuclide Sampling Events
Table 12. Meteorological Summary for Metal and PM2.5 Sampling Events
Table 13. Seasonal and Monthly Coverage Summary
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ACRONYMS AND ABBREVIATIONS
AMP Air monitoring plan
AUM Abandoned uranium mine
DQO Data quality objective
ERT Environmental Response Team
NAAQS National Ambient Air Quality Standard
NAREL National Analytical Radiation Environmental Laboratory
NNAQCP Navajo Nation Air Quality Control Program
NTUA Navajo Tribal Utility Authority
PAL Project action limit
PM2.5 Particulate matter less than 2.5 micrometers in diameter
QAPP Quality assurance project plan
Ra-226 Radium-226
Ra-228 Radium-228
RPD Relative percent difference
SCF Standard cubic foot
SCFM Standard cubic foot per minute
Tetra Tech Tetra Tech, Inc.
Th-230 Thorium-230
Th-232 Thorium-23 2
U-234 Uranium-23 4
U-235 Uranium-23 5
U-238 Uranium-23 8
USEPA U.S. Environmental Protection Agency
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EXECUTIVE SUMMARY
The U.S. Environmental Protection Agency (USEPA) tasked Tetra Tech, Inc. (Tetra Tech) to
develop an air monitoring plan (AMP) for collecting air sampling data in the Cove area within
the Northern Abandoned Uranium Mine (AUM) Region of the Navajo Nation. This effort is
referred to as the Cove Air Study. Tetra Tech team members iina ba and Environmental
Restoration Group, Inc. provided local experience, logistics, and radiation assessment
experience. This work was assigned under Task Order 0012 of the Response, Assessment, and
Evaluation Services contract (EP-S9-17-03).
Five sampling locations were selected to evaluate potential exposure to residents in the Cove
area, which is downwind of the AUMs in the nearby Lukachukai Mountains. Air samples were
collected weekly during the effort and analyzed for radionuclides, metals, and particulate matter
less than 2.5 micrometers in diameter (PM2.5).
This report summarizes the sample results and meteorological data collected over a 57 week-
long sampling event between February 10, 2020, and June 21, 2022. The weeks of sampling
covered in this report are referred to as "Events" and are numbered sequentially from 1 to 57
despite the gap of over a year between Events 7 and 8 and about 2 months between Events 44
and 45.
During development of the AMP for the Cove Air Study and following USEPA guidance,
project action limits (PAL) for metals and PM2.5 were identified in the quality assurance project
plan prepared before sampling started. PALs represent the concentrations of contaminants in air
sampled above which risk is added for people living or working in the area.
The sampling results for the study were:
No samples collected had a result above the PAL for radionuclides, metals, or PM2.5. This
indicates that:
o Risk from exposure to the air sampled during this time period for each individual
radionuclide and metal studied does not exceed the upper end of the EPA risk
management range for excess cancer risk of 1E-06 to 1E-04 or a noncancer
hazard quotient of 0.1, and
o PM2.5 concentrations did not exceed the National Ambient Air Quality Standard
(NAAQS) for PM2.5.
Meteorological data showed the predominant wind direction during the sampling events
was from the southwest with frequent periods of wind from the northeast. Because no
previous meteorological data are available, determining whether the observed
meteorological data are typical or atypical is not possible.
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1.0 INTRODUCTION
The U.S. Environmental Protection Agency (USEPA) tasked Tetra Tech, Inc. (Tetra Tech) to
develop an air monitoring plan (AMP) for collecting air sampling data in the Cove area within
the Northern Abandoned Uranium Mine (AUM) Region of the Navajo Nation. This effort is
referred to as the Cove Air Study. Tetra Tech team members iina ba and Environmental
Restoration Group, Inc. provided local experience, logistics, and radiation assessment
experience. This work was assigned under Task Order 0012 of the Response, Assessment, and
Evaluation Services contract (EP-S9-17-03).
Five sampling locations were selected to evaluate potential exposure to residents in the Cove
area, which is downwind of the AUMs in the nearby Lukachukai Mountains. Samples were
collected weekly during the effort and analyzed for radionuclides, metals, and particulate matter
less than 2.5 micrometers in diameter (PM2.5).
Project work was performed in accordance with the AMP finalized on January 8, 2020 (Tetra
Tech 2020). The AMP contains appendices with a sampling and analysis plan, quality assurance
project plan (QAPP), health and safety plan, and site-specific data management plan. The
technical portion of the sampling and analysis work followed the requirements in the sampling
and analysis plan and QAPP. The QAPP appendix was revised and finalized on June 11, 2021
(Tetra Tech 2021).
This report summarizes the sample results and meteorological data collected over a 57 week-
long sampling event between February 10, 2020, and June 21, 2022. The weeks of sampling
covered in this report are referred to as "Events" and are numbered sequentially from 1 to 57
despite the gap of over a year between Events 7 and 8 and about 2 months between Events 44
and 45.
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2.0 FIELD SAMPLING
Five stations in or near Cove, Arizona, were sampled weekly for radionuclides, metals, and
PM2.5 using air samplers provided by the USEPA Environmental Response Team (ERT):
Cove Chapter House station
Cove Day School station
Cove water tower station
Residential station
Navajo Tribal Utility Authority (NTUA) pump station (which served as the reference
location)
The station locations are shown on Figure 1. Tables 1 and 2 summarize the sampling dates of
each event and the latitude and longitude coordinates for each station.
Sampling began in February 2020 with the goal of sampling for a full year. However, after
7 weeks, the sampling effort was temporarily paused because of COVID-19 restrictions. The
process of recalibrating the air samplers began in February 2021, and sampling restarted in
May 2021. In late January 2022, sampling was paused for about 2 months because many of the
radionuclide samplers were not operational. Replacement samplers were acquired and mobilized
to the field, and sampling restarted in March 2022 for 3 more months.
2.1 RADIONUCLIDE SAMPLING
Radionuclide samples were collected using F&J Specialty Products DH-100V samplers. The
AMP specified samples be collected at a flow rate of 15 standard cubic feet per minute (SCFM)
for at least 98.1 hours (4.1 days) to reach a sampling volume of 88,290 standard cubic feet (SCF)
and achieve the desired reporting and detection limits.
Because of the remote sampling location, the sampling team only mobilized to the site once a
week to collect samples from the previous week and restart the samplers. Consequently, the
radionuclide samplers were set up for a 6.5-day collection time and a flow rate of 10 SCFM.
Therefore, the nominal sampling volume was 93,600 SCF, resulting in slightly lower nominal
reporting and detection limits than the AMP specified. This configuration was used through
Event 44. The new samplers were configured with flow rates of 15 SCFM. Therefore, the
nominal sampling volume for Events 45 through 57 was 140,400 SCF, giving even lower
nominal reporting and detection limits.
Table 1 summarizes the radionuclide data obtained for each sampler for each week of sampling.
During the 2021 and early 2022 sampling events, some of the radionuclide samplers stopped
working because of power outages or equipment failures and, in some cases, would not restart
for the following week of sampling. When this occurred, the samplers were returned to USEPA
ERT for repair.
For quality control, the AMP specified that one blank sample be collected and analyzed weekly,
and one duplicate sample be collected every other week using an extra sampler located adjacent
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to the primary sampler at the same station. However, in practice, the duplicate for radionuclide
analysis could not always be collected because of equipment failures. Section 3.3 discusses the
frequency and results for the quality control samples collected.
2.2 METALS AND PM2.5 SAMPLING
Metals and PM2.5 samples were collected using BGIPQ200 samplers. The AMP specified that
samples would be collected at a flow rate of 16.7 standard liters per minute over a 24-hour
sampling period, resulting in a nominal 24 standard cubic meter sample volume to achieve the
desired detection limits. To standardize collection, the samplers were set up to begin collection at
midnight on Friday morning and finish sampling at midnight on Friday night.
Table 2 summarizes metals and PM2.5 data obtained for each sampler for each week of sampling.
Metals samples were collected during each week of sampling with no sampler interruptions.
However, because of COVID-19 restrictions, samples for Event 7 were not collected until long
after the sample holding times. Because of the method requirements for conditioning of the
sampled filters within 30 days after initial conditioning, these samples were not submitted for
analysis.
For quality control, the AMP specified one blank sample be collected and analyzed weekly, and
one duplicate sample be collected every other week using an extra sampler located adjacent to
the primary sampler at the same station. Section 3.3 discusses the results for the quality control
samples collected.
2.3 METEOROLOGICAL STATION DATA
A meteorological station was procured and installed by Navajo Nation Air Quality Control
Program (NNAQCP) personnel at the Cove Chapter House station. This station was used to
collect data on wind speed and direction, temperature, relative humidity, precipitation, and solar
radiation.
Meteorological data were collected for the following periods:
March 6, 2020, at 2:00 PM local time through April 17, 2020, at 11:00 AM local time
March 9, 2021, at 2:00 PM local time through June 21, 2022, at 10:00 AM local time.
The meteorological station collected both hourly and daily data; however, for the purposes of
this report, only the hourly data were used.
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3.0 RADIONUCLIDE RESULTS
This section summarizes the analytical methods, field sample results, and field quality control
sample results for radionuclides from the Cove Air Study.
3.1 RADIONUCLIDE ANALYTICAL METHODS
Samples were analyzed for the following analytes by the National Analytical Radiation
Environmental Laboratory (NAREL) using the indicated analytical methods:
Thorium-230 (Th-230) and thorium-232 (Th-232) using method NAREL TH-EICHROM
Uranium-234 (U-234), uranium-235 (U-235), and uranium-238 (U-238) using method
NAREL U-EICHROM
Radium-226 (Ra-226) using method NAREL RA-07-EC
Radium-228 (Ra-228) and gamma spectroscopy using method NAREL GAM-01
Gross alpha and gross beta using USEPA method 900.0
For the gamma spectroscopy method NAREL GAM-01, NAREL reported results for all
individual radionuclides detected. These included results for Ra-226 and U-235 in addition to
other radionuclides not specified in the QAPP for analysis by gamma spectroscopy. NAREL
indicated in the laboratory reports that potential spectral interference and other problems possibly
associated with the determination of the activity of certain radionuclides result in greater
uncertainty in the activities reported by this method for those radionuclides than for other
commonly reported radionuclides. NAREL also recommended that for this method and the
radionuclides discussed, including Ra-226 and U-235, the results should be used only as a
qualitative means of indicating presence of these radionuclides and not as a quantitative measure
of their concentration. Therefore, the results for Ra-226 and U-235 by the gamma spectroscopy
method are not summarized in this report although they have been uploaded into the project
Scribe database. Results for Ra-226 and U-235 are instead reported for the isotope-specific
methods used for these radionuclides. In this report, only results for Ra-228 are reported from the
gamma spectroscopy method.
3.2 RADIONUCLIDE FIELD SAMPLE RESULTS
The radionuclide results for all QAPP analytes are summarized in Table 3 and Table 4. The
results are also summarized for Ra-226, U-234, and U-238 in chart form on Figure 2 through
Figure 4. These tables list the project action limits (PAL) as defined in the QAPP, as well as
alternate PALs. The PALs listed in the QAPP were based on a target cancer risk of 3E-04 and a
target hazard quotient of 0.1. USEPA is currently making decisions based on a target cancer risk
of 1E-04 and a target hazard quotient of 0.1. Therefore, this report uses alternate PALs based on
these target levels. Each figure shows the detected results by sampling station and event, the
alternate PAL, and the maximum reporting limit for all samples in which the radionuclide was
not detected.
No radionuclide concentration in any sample exceeded the PAL or alternate PAL. The lack of
exceedances of these PALs indicates that risk from exposure to the each individual radionuclide
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studied in the air sampled during this time period does not exceed the EPA risk management
range for excess cancer risk of 1E-06 to 1E-04.
3.3 RADIONUCLIDE FIELD QUALITY CONTROL RESULTS
Field blanks and field duplicates were collected to assess data quality as outlined in the QAPP.
The data validation team did not qualify sample results based on field quality control results.
During several events, sample volumes were low or no samples were collected because of
technical problems with the FJ100 samplers used for radionuclide sampling. These samplers
were removed from service, sent back to USEPA ERT for servicing, and then returned to the
field after repair.
Field blank results for radionuclides are summarized in Table 5. One field blank was collected
during each week of sampling except Event 20 when no radionuclide samples were collected
because the samplers would not restart. Several radionuclides were detected in one or more field
blanks at concentrations not meeting the QAPP data quality objective (DQO) of the detected
concentration being below the minimum detectable concentration:
Ra-226, Th-230, Th-232, U-234, U-238, gross alpha, and gross beta were detected in
most or all field blanks at concentrations above the minimum detectable concentration or
minimum detectable activity. The concentrations or activities detected were generally
near the low end of the range of detected concentrations or activities for field samples.
Field duplicate results for radionuclides where both results were detected are listed in Table 6.
The QAPP specified collection of one field duplicate every other week, but the sampling
equipment failures reduced the field duplicates collected. A total of 20 field duplicates were
collected; however, during Event 12, the field duplicate had insufficient volume, so only 19 field
duplicates with valid data for both pairs were collected. Field duplicates were collected weekly
for radionuclides between Events 45 and 57 to compensate for the missing field duplicates earlier
in the project, but the QAPP goal of 26 field duplicates could not be reached.
The relative percent difference (RPD) did not meet the QAPP DQO of 20 percent for
radionuclides in the following cases (the sample results for these duplicate pairs should be
considered estimated):
For gross alpha, seven duplicate pairs had RPDs exceeding 20 percent (from Events 8,
10, 48, 53, 54, 55, and 56) with a maximum RPD of 66 percent.
For gross beta, five duplicate pairs had RPDs exceeding 20 percent (from Events 1, 10,
46, 56, and 57) with a maximum RPD of 113 percent.
For Ra-226, four duplicate pairs had RPDs exceeding 20 percent (from Events 49, 50, 56,
and 57) with a maximum RPD of 49 percent.
For Th-230, the duplicate pair for Event 53 had an RPD exceeding 20 percent (24
percent).
For Th-232, three duplicate pairs had RPDs exceeding 20 percent (from Events 53, 54,
and 56) with a maximum RPD of 30 percent.
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For U-238, four duplicate pairs had RPDs exceeding 20 percent (from Events 49, 50, 53,
and 54) with a maximum RPD of 40 percent.
3.4 RADIONUCLIDE RESULT QUALIFICATIONS
The data validation team rejected nine Ra-226 results. Rejected data were not reported in the
electronic data deliverables but were summarized in the data validation reports. The rejected data
were:
Sample results for all radionuclide analytes for the following 32 samples did not attain a
sampling volume between 75 and 125 percent of the intended nominal sample volume
(93,600 SCF for Events 1 through 44, and 145,080 SCF for Events 45 through 57):
o Residential station: Events 10, 11, 12 (field duplicate), 13, and 31
o Cove Day School station: Events 10, 11, 12, 13, 30, 31, and 46
o Cove water tower station: Events 10, 13, 30, 32, and 49
o Cove Chapter House station: Events 17, 18, 19, 32, 39, 40, 41, and 49
o NTUA pump station: Events 5, 8, 10, 11, 12, 32, and 41
Sample results for Ra-226 in nine samples were rejected based on poor spectral
resolution:
o Residential station: Event 10
o Cove Day School station: Events 7 and 10
o Cove water tower station: Event 7
o Cove Chapter House station: Event 7
o NTUA pump station: Events 5 and 11
o Field blank sample: Events 9 and 11
Other qualifications were applied by the data validation team for a variety of reasons, including
field blank results. Some results with reported activity were changed to nondetects or qualified as
estimated with a high bias based on the field blank results. The data are used as recommended by
the data validation team.
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4.0 METALS AND PM2.5 RESULTS
This section summarizes the analytical methods used for metals and PM2.5 sampling, and the
field sample results and field quality control sample results for metals and PM2.5.
4.1 METALS AND PM2.5 ANALYTICAL METHODS
Samples were analyzed for metals and PM2.5 by Enthalpy Analytical, LLC. Metals were
analyzed using USEPA method 10-3.5, and PM2.5 was analyzed using USEPA method 10-3.1
and following 40 Code of Federal Regulations Part 50.
4.2 METALS AND PM2.5 FIELD SAMPLE RESULTS
The metals and PM2.5 results are summarized in Table 7 and Table 8 and shown on Figure 5
through Figure 12. These tables list the PALs as defined in the QAPP, as well as alternate PALs.
The QAPP PALs were based on a target cancer risk of 3E-04 and a target hazard quotient of 0.1.
USEPA is currently making decisions based on a target cancer risk of 1E-04 and a target hazard
quotient of 0.1. Therefore, this report uses alternate PALs based on these target levels. Each
figure shows the detected results by sampling station and event, the alternate PAL, and the
maximum reporting limit for all samples in which the constituent was not detected.
No metal or PM2.5 concentration in any sample exceeded the PAL or alternate PAL. The lack of
exceedances of these PALs indicates that risk from exposure to each individual metal studied in
the air sampled during this time period does not exceed the EPA risk management range for
excess cancer risk of 1E-06 to 1E-04 or a hazard quotient of 0.1, and that the National Ambient
Air Quality Standard (NAAQS) standard for PM2.5 was not exceeded in any sample.
4.3 METALS AND PM2.5 FIELD QUALITY CONTROL RESULTS
Field blanks and field duplicates were collected to assess data quality as outlined in the QAPP.
The data validation team did not qualify sample results based on field quality control results.
Field blank results for PM2.5 and metals are summarized in Table 9. One field blank was
collected during each week of sampling. PM2.5 and several metals (barium, lead, selenium, and
vanadium) were detected in one or more field blanks. Detections met the QAPP DQO of the
detected concentration being below the reporting limit with the following exceptions:
PM2.5 was detected in 3 of 56 field blanks at concentrations above the reporting limit of
0.042 micrograms per cubic meter for Events 8, 20, and 29. The concentrations detected
were approximately a factor of 10 or more below all detected results for the same weeks
of sampling for Events 8 and 20, indicating the PM2.5 results for these events are likely
not significantly impacted by blank contamination. However, the concentrations detected
for Event 29 were within a factor of 5 of the detected results for field samples, indicating
that some positive bias may have been observed for those samples. These samples are not
likely false positives but should be considered estimated with a possible positive bias.
Barium was detected in 5 of 56 field blanks at concentrations above the reporting limit of
0.00083 micrograms per cubic meter for the samples from Events 11, 14, 39, 50, and 53.
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The field blank result was close to the maximum concentration detected for each of these
weeks, indicating the results may be false positives from blank contamination.
Field duplicate results for PM2.5 and metals where both results were detected are listed in
Table 10. For metals and PM2.5, 28 field duplicates were collected. The RPD for field duplicate
pairs were calculated when the analyte was detected in both the original and the field duplicate
sample. The RPD did not meet the QAPP DQOs of 25 percent for PM2.5 and 20 percent for
metals in the following cases:
For barium, 12 of the 20 duplicate pairs had RPDs exceeding 20 percent (from Events 5,
10, 18, 20, 24, 26, 34, 36, 38, 45, 53, and 55) with a maximum RPD of 112 percent. The
results for these samples were close to the reporting limit. These samples should be
considered estimated.
For lead, 5 of the 11 duplicate pairs had RPDs exceeding 20 percent (from Events 18, 24,
30, 42, and 44) with a maximum RPD of 75 percent. The results for these samples were
close to the reporting limit. These samples should be considered estimated.
For vanadium, 1 duplicate pair had an RPD of 30 percent (from Event 49). The results for
this sample were close to the reporting limit. This sample duplicate pair should be
considered estimated.
For PM2.5, 11 of the 24 duplicate pairs had RPDs exceeding 25 percent (from Events 2, 5,
8, 10, 12, 14, 24, 28, 36, 40, and 44) with a maximum RPD of 99 percent. These samples
should be considered estimated.
To summarize:
Field blank results may indicate false positives for barium results in a few samples from
Events 11 and 14.
Field duplicate results for several metal and PM2.5 results are considered estimated based
on precision not meeting the QAPP DQOs.
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5.0 METEOROLOGICAL DATA
Meteorological data were collected using a Campbell Scientific Meteorological Station at the
Cove Chapter House station using a CR1000 data logger. The data are summarized in this report
for each sampling event. The data fields collected were:
Date and time of the observation
Sequential record number
Temperature in degrees Celsius
Relative humidity in percent
Barometric pressure in millimeters of mercury (however, the Navajo Nation
Environmental Protection Agency indicated this sensor was not operational, so pressure
data are not summarized in this report)
Rainfall in inches
Solar radiation in Webers per square meter
Wind speed using two separate averaging methods (scalar averaging and vector
averaging) in miles per hour
Wind direction (using scalar averaging and vector averaging) in degrees
Standard deviation of the wind direction (for both the scalar and vector averaging
methods) in degrees
Both daily and hourly summary data were downloaded from the meteorological station by
NNAQCP. For the purposes of this report, only the hourly data were used. The sampling periods
were generally as follows:
Radionuclide samplers were started manually around noon on Tuesday and ran for
6.5 days. For this report, the data were tabulated from noon on the start of the sampling
day through the midnight before collection.
Metals and PM2.5 samplers were started up automatically at midnight on Thursday
evening and stopped automatically 24 hours later at midnight on Friday evening. For this
report, the data were tabulated from midnight to midnight on these days.
For the radionuclide samples, individual sample start and stop times varied slightly. However,
for the purposes of this report and study, these differences are minor. Full meteorological data
are available for more detailed analysis if necessary.
Data collection from the meteorological station did not begin until partway through Event 4.
Therefore, meteorological data are not available for the first three sampling events. Although
some data are available for Event 4, meteorological summary data are not presented for Event 4
because of the high uncertainty associated with averaging only about half the sampling period.
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5.1 METEOROLOGICAL DATA SUMMARY TABLES
Table 11 summarizes the meteorological data for the 57 radionuclide sample collection events.
The table shows the expected general increase in average temperature between the spring and
summer. The average relative humidity and average total solar radiation also increased during
this period. Average wind speed ranged from 1.5 to 5.1 meters per second for scalar averaging
and from 1.3 to 4.8 meters per second for vector averaging with higher average wind speeds
observed in the spring months. The weekly average wind directions ranged from 179 to
258 degrees for scalar averaging and from 178 to 257 degrees for vector averaging.
Table 12 summarizes the data for the 57 metals and PM2.5 sample collection events. The trends
observed in Table 11 were also seen generally in Table 12 except for more variability in wind
data, which would be expected from the shorter sampling periods. The wind speed was
particularly high during Events 9, 49, and 51.
5.2 WIND ROSE PLOTS
Table 11 and Table 12 summarize wind speed and wind direction. However, for wind direction,
wind rose plots also provide a helpful visual indication of the data. Wind rose plots were
generated using WRPLOT View software version 8.0.2 and are presented in Figure 13 for the
radionuclide sampling events and Figure 14 for the metals and PM2.5 sampling events. As noted
above, complete data were not available for the first 4 weeks of sampling in 2020, so wind roses
are not presented for those weeks of sampling.
The wind roses show the frequency of specific wind direction and wind speeds. The directions
shown are the directions from which the wind is coming. As illustrated by the wind roses, the
predominant wind direction during the sampling events was from the southwest, but there were
also frequent periods where the wind direction was from the northeast and occasional periods
where the wind direction was from other directions. The variability of wind directions appears
higher for the metals and PM2.5 sampling events, which is not surprising since these samples are
collected over a 24-hour period (compared with 6.5 days for the radionuclide samples).
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Full Year Analytical Report, Cove Air Study
It
6.0 DATA USABILITY
The QAPP identified USEPA as the party that would prepare the usability assessment; this
section provides information that will assist in that assessment (Tetra Tech 2021). Data usability
is based on the precision, accuracy, representativeness, comparability, completeness, and
sensitivity of the methods used.
6.1 PRECISION
Precision was assessed using field duplicate pairs, laboratory control samples, and laboratory
control sample duplicate pairs. Laboratory duplicate pairs cannot be analyzed because of the
nature of the air filters.
Laboratory control sample and laboratory control sample duplicate pair precision was evaluated
during data validation against QAPP criteria and generally met criteria. Data were qualified as
estimated as necessary.
As noted in Section 3.3 and Table 6, field precision for radionuclides was generally good. In a
total of 73 duplicate pair results, both results were detected. For these pairs, the RPD ranged
from 0 to 113 percent with an average of 19 percent. Of these 73 pairs, 49 met the QAPP criteria
of 20 percent for radionuclides and 24 did not. The data validation did not qualify data based on
field duplicate RPD criteria from the QAPP, but for the 24 duplicate pairs that did not meet
criteria, the reported results should be considered estimated.
As noted in Section 4.3 and Table 10, field precision for metals was generally good. In a total of
35 duplicate pair results, both results were detected. For these pairs, the RPD ranged from 0 to
112 percent with an average of 29 percent. Of the 35 pairs, 17 met the QAPP criteria of
20 percent for metals and 18 did not. The data validation did not qualify data based on field
duplicate RPD criteria from the QAPP, but for the 18 duplicate pairs that did not meet criteria,
the reported results should be considered estimated.
As noted in Section 4.3 and Table 10, field precision for PM2.5 was generally very good. In a
total of 24 duplicate pair results, both results were detected. For these pairs, the RPD ranged
from 0 to 99 percent with an average of 31 percent. Of the 24 pairs, 13 met the QAPP criteria of
25 percent for PM2.5 and 11 did not. The data validation did not qualify data based on field
duplicate RPD criteria from the QAPP, but for the 11 duplicate pairs that did not meet criteria,
the reported results should be considered estimated.
For metals, post-digestion matrix spikes can also be used to assess precision. However, that
assessment has not been performed as part of this limited usability assessment. Generally,
criteria were met for these criteria and data were qualified as appropriate by the data validation.
6.2 ACCURACY
Accuracy was assessed for radionuclides, metals, and PM2.5 using method blanks and field
blanks. Method and field blanks generally met criteria for metals. Method blanks generally met
criteria for radionuclides, but field blanks frequently exceeded the criteria. When criteria were
Contract No. EP-S9-17-03, Task Order 0012 11
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Full Year Analytical Report, Cove Air Study
It
not met, data were qualified as nondetect (U) or estimated with a high bias (J+) during validation
as appropriate based on the concentration in the blanks and field samples.
Accuracy can also be assessed for radionuclides, metals, and PM2.5 using laboratory control
samples and for metals using inductively coupled plasma mass spectrometry tuning data, post-
digestion spike samples, and inductively coupled plasma interference check samples. However,
these assessments have not been performed as part of this limited usability assessment.
Generally, criteria were met for these criteria and data were qualified as appropriate by the
validation team.
6.3 REPRESENTATIVENESS
The representativeness of the dataset includes two aspects: the spatial representativeness of the
sampling, and the temporal representativeness.
The spatial representativeness for air samples is based on two factors. The first is whether the
locations sampled are representative of the receptors to be evaluated for risk by USEPA. The
second is whether those receptors are adequately covered by the stations selected or, in other
words, whether the wind direction during the study period provided enough opportunity to detect
airborne particulate blowing from the AUMs to the stations.
The first aspect of spatial representativeness is assured as all sampling stations are located within
the bounds of the Cove Chapter except for the NTUA pump station, which was intended to serve
as the reference location. The second aspect of spatial representativeness was evaluated based on
the wind direction measured over the sampling period. Figure 15 shows the Cove area including
the location of the sampling stations and AUMs in the Lukachukai Mountains to the southwest of
Cove. This figure also shows a wind rose. The wind rose shows the wind direction was
predominantly from the AUMs to Cove during the time periods sampled.
The temporal representativeness for air samples is also based on two factors. The first is whether
the sampling period covers an adequate period of time. The second is whether the sampling
period occurred during a time when meteorological conditions were typical for the area.
The first aspect of temporal representativeness was evaluated by assessing against the QAPP
goals, which were to collect data for a full year. Although the 57 week-long sampling events
represent more than the goal of 52 weeks, gaps in the study because of COVID-19 (between
Events 7 and 8) and equipment-related delays (between Events 44 and 45) occurred. Table 13
summarizes the representativeness of the data by showing the number or samples collected in
specific seasons and months. For this table, the number of events with data for any Cove station
during a particular month or season are combined. Although some variation between the
coverage for seasons occurred, at least 20 samples were collected in each season. Spring was the
season with the most samples collected and generally had the highest wind speeds.
The second aspect of temporal representativeness was evaluated by comparing wind speeds,
wind directions, PM2.5 concentrations, and metals concentrations for periods where some or all
radionuclide data were missing against the periods where data were obtained. Figure 16 through
Figure 24 show the values for various wind parameters and contaminants of potential concern
Contract No. EP-S9-17-03, Task Order 0012 12
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Full Year Analytical Report, Cove Air Study
It
concentrations for each event against the number of stations with radionuclide data during that
event:
Figure 16 shows averaged hourly vector wind speed.
Figure 17 shows the maximum hourly vector wind speed.
Figure 18 shows averaged hourly vector wind direction.
Figure 19 shows averaged PM2.5 concentration.
Figure 20, Figure 21, Figure 22, Figure 23, and Figure 24 show averaged arsenic, barium,
molybdenum, lead, and vanadium concentrations, respectively. Only detected
concentrations were averaged, so some events do not appear in some figures. Other
metals were not plotted because of very low detection frequency.
In summary, temporal representativeness within the time period collected was good. Sampling
events missing data from one or more stations were generally not those with higher wind speeds,
different wind directions, or higher PM2.5 or metals concentrations. However, the metals and
PM2.5 sampling periods were shorter than the radionuclide sampling periods, so the data from
these periods are not completely representative of each other.
6.4 COMPARABILITY
Samples were collected following standard procedures and the project QAPP and, as such, are
expected to be comparable to data collected using similar equipment and procedures. The
laboratories used followed standard methods, and the data generated are expected to be
comparable to data generated by laboratories following similar standard methods.
6.5 COMPLETENESS
The completeness of the dataset was evaluated in several ways. The most basic is to assess the
criteria in the QAPP, which specified collection of four samples per week from Cove for
52 weeks (208 field samples) along with one reference location sample per week (52 samples),
one field blank each week (52 field blanks), and one field duplicate every other week (26 field
duplicates). The values below consider how many events had data where data were collected and
not rejected for insufficient volume during data validation:
Radionuclides:
o A total of 134 valid samples were collected in Cove for a percent completeness of
134/208 or 64 percent.
o A total of 35 valid samples were collected from the reference location for a percent
completeness of 35/52 or 67 percent.
o A total of 52 valid field blanks were collected for a completeness of 100 percent.
o A total of 19 valid field duplicates were collected for a completeness of 73 percent.
Metals and PM2.5:
Contract No. EP-S9-17-03, Task Order 0012 13
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Full Year Analytical Report, Cove Air Study
o All field samples and field blanks were collected for each of the 57 events except
Event 7,for a completeness of 98 percent for each type.
o Field duplicates were collected for 30 events for a completeness of 100 percent.
6.6 SENSITIVITY
Reporting limits for all samples met the QAPP sensitivity goals based on the PALs for the
project. Reporting limits were also below the alternative PALs described in Sections 3.2 and 4.2
for all analytes in all samples.
Contract No. EP-S9-17-03, Task Order 0012
14
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Full Year Analytical Report, Cove Air Study
7.0 REFERENCES
Tetra Tech, Inc. (Tetra Tech). 2020. "Northern Agency Tronox Mines, Cove Air Study, Air
Monitoring Plan." January 8.
Tetra Tech. 2021. "Appendix B: Quality Assurance Project Plan." In the "Northern Agency
Tronox Mines, Cove Air Study, Air Monitoring Plan." Revision 1. June 11.
Contract No. EP-S9-17-03, Task Order 0012
15
-------
FIGURES
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Figure 1. Air Sampling Station Locations
-------
1.0E-01
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
ND
Nondetect
PAL
Project action limit
pCi/m3
Picocurie per cubic meter
TR
Target risk
1.0E-02
Cl
c
.2 1.0E-03
¦M
ro
4'
c
0)
u
c
o
u
* *
a-a- *
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OE-04 -J + T* TAT
~
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±a aaa
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A A A
A _- A
aA a
A*
i
A A"
1.0E-05
4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 2. Radium-226 Results
-------
1.0E-01
1.0E-02
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR= IE-04
Notes:
ND
Nondetect
PAL
Project action limit
pCi/m3
Picocurie per cubic meter
TR
Target risk
1.0E-03
~
1.0E-04 1
A _ AA *-
* ±*-* -
1 A*2*±±A*
ix A
*-
A AAAaAA
A A_-~ _-^_
*AA* " I
1.0E-05
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 3. Uranium-234 Results
-------
1.0E-01
1.0E-02
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR= IE-04
Notes:
ND Nondetect
PAL Project action limit
pCi/m3 Picocurie per cubic meter
TR Target risk
1.0E-03
1.0E-04 *
1.0E-05
~
A *"*** *
A a- A
A-
. 4 -4S
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 4. Uranium-238 Results
-------
1.0E+03
1.0E+02
< 1.0E+01
00
c
o
"+->
£
4-J
c
1.0E-01
1.0E-02
A
Maximum Detected
-
Minimum Detected
~
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
A- A 'A- A
A *-
A A~
- A "
S - a!
±A a
±A
-A
A aA A A
" 1
A £
A ~
A
-A A
- A
A * AA
A AAA AAA**
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 5. PM2.5 Results
-------
1.0E-01
1.0E-02
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR= IE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
ji
c
2 1.0E-03
£
4-1
c
01
u
c
o
u
* A
AAA A A A A
*
.0E-04 ] A ~ - *
****** +**** *- * :
1.0E-05
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 6. Arsenic Results
-------
l.OE+OO
1.0E-01
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
1.0E-02
1.0E-03
- A A ±A *
a a ~ iA A
A A _ _ A A A
A 4 A
A A _-A A A_
Ia a a - A
A A
1.0E-04
*-* A a - A A AA A
A
I 14" I" -_i A T
A A A - A I ~
- A
A ~
-A
1.0E-05
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 7. Barium Results
-------
1.0E+01
l.OE+OO
A
Maximum Detected
-
Minimum Detected
~
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
[jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
1.0E-01
1.0E-02
1.0E-03
~ * * ***** A*** **
A A A
1.0E-04
1.0E-05
' A
A-
~
-A
~ AAA A &***
A A A
A -A
A AAaA^ A
-A
**
A
AA^±~~
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 8. Lead Results
-------
1.0E+01
l.OE+OO
1.0E-01
1.0E-02
1.0E-03
1.0E-04
1.0E-05
A
A
Maximum Detected
Minimum Detected
Maximum ND
Minimum ND
PAL at TR=lE-04
|jg/m
ND
PAL
TR
Microgram per cubic mete
Nondetect
Project action limit
Target risk
r
~
~ i
~ i
L
~
~
~
*
~
A _
*
~
0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 9. Molybdenum Results
-------
1.0E+02
1.0E+01
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
l.OE+OO
1.0E-01
1.0E-02
1.0E-03
1.0E-04
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 10. Selenium Results
-------
1.0E-01
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
1.0E-02
ji
c
2 1.0E-03
£
4-1
c
01
u
c
o
u
~ A
1.0E-04
1.0E-05
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 11. Uranium Results
-------
l.OE+OO
1.0E-01
A
Maximum Detected
-
Minimum Detected
A
Maximum ND
-
Minimum ND
PAL at TR=lE-04
Notes:
|jg/m3
Microgram per cubic meter
ND
Nondetect
PAL
Project action limit
TR
Target risk
1.0E-02 4
ji
c
o
J-J
£
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O
(J
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~~~~ ~
1.0E-04
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*********
t- A* 4 !
*1- a
1.0E-05
8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 48 50 52 54 56 58
Study Event
Figure 12. Vanadium Results
-------
Event 5
Event 6
Event 7
12%
9.03% \
6.02% \
WIND
SPEED
(rrVs)
¦
>= 11.10
¦
8.80- 11.1C
¦
5.70 - 8.80
¦
3.60 - 5.70
~
2.10-3.60
~
0.50-2.10
Calms
1.92%
NORTH .
16.4%
13.1% \
'9.81% \ \
6.54% \ \ \
/ / 3.27% \
M ( "¦=
(WEST:
(
V
V
WIND SPEED
(m/s)
~ U >=11-10
H 8.80-11.10
¦ 5.70-8.80
SOUTH ¦ 3.60-5.70
I I 2.10-3.60
I I 0.50-2.10
Calms: 1.28%
NORTH "
20.3%
16.2% \
'12.2% \ \
8.12% \ \ \
¦¦ r- , 4.06
Co \ 'i ;
[WEST:
&
) ; j EAST!
w
WIND SPEED
(TVs)
I I >=11.10
H 8.80-11.10
¦ 5.70-8.80
SOUTH-
H 3.60-5.70
I I 2.10-3.60
I I 0.50-2.10
Calms: 1.28%
Event 8
Event 9
Event 10
12%
'9.03% .
WIND SPEED
(irVs)
I I >=11.1D
I I 2.10-3.6
Ml 0.50-2.1
Calms: 1.28%
20.3%
'16.2% \
'12.2% \
8.12% \ \ \
4.06% ;
Y!f. ; ; j !
m
1 \ ! EAST;
f
SOUTH
wiro SPEED
(nVs)
I i >=11.10
¦ 8.80-11.10
I 0.50-2.10
Calms: 0.64%
Wir-D SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 0.00%
Figure 13. Wind Roses, All Radionuclide Sampling Events
Page 1 of 9
-------
Event 11
Event 12
Event 13
12.3%
58% \
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
3.03%
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 0.00%
*
L ¦
NORTH
8.5%
6.8%-^,
5.1%' \
,.'^¦3.4%,,''''\ \ \
WEST; m
\*V~a: j EAST:
WIND SPEED
./' ./ (nVs)
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH EH 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 1.28%
Event 14
11.1%
8.88% \
1 \
r /
WIND SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
Event 15
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
2.56%
Event 16
12.5%
9.96% "it.
7.47%, _
,¦^2.49%''
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
1.28%
Figure 13. Wind Roses, All Radionuclide Sampling Events (Continued)
Page 2 of 9
-------
Event 17
Event 18
Event 19
NORTH
i i i i
11.8%
9.4% \
7.05% \
~4.7%V\ \
J^.2.35%^^ ¦ i i
jWESTi
1 V/
4
^|T ; / : EAST!
WIND SPEED
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
I 2.10-3.60
Calms: 1.92%
"'x 9.15%
7.32%
^ 5.49% \
J&3 66% \ \ \
i WESj^JU
V
i i
: EAST!
v>
WIND SPEED
/ (mfe)
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH EH 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 1.28%
ORTH
11.1%
'8.88%
6.66% \
/>444%---^3 , \
jWESTi^
/ i : EAST:
WIMD SPEED
/ (mfe)
>= 11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH EH 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 2.56%
Event 20
Event 21
Event 22
12.5%
9.96% \
'7.47% \
WIND
SPEED
(mfe)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
O.B4%
WIND SPEED
(mfe)
!_¦ 5.70 - 8.80
3.60 - 5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 2.56%
12.5%
9.96% \
'7.47% \
WIND
SPEED
(mfe)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
1.92%
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 3 of 9
-------
Event 23
Event 24
Event 25
13.1%
10.5%' \\
_5.24%-'<;
<2 62%
%
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 0.64%
Event 26
12.5%
9.96% \
'7.47% \
~ "2.49% '
W'Y
WIND
SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
3.85%
11.8%
'9.4% \
'--N 4.7%
>2.35%
U-i"
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
4.49%
Event 27
11.1%
8.88% \
. ,
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
7.B9%
14.4%
11.5% \
8.64% \
5. 76% \ \ \
.-2'88% \ ;
""" 7 I ; ;EASf!
r
SOUTH
wiro SPEED
(nVs)
I i >=11.10
¦ 8.80-11.10
I 0.50-2.10
Calms: 2.56%
Event 28
NORTH
16.4%
13.1% \
9.81% \
n J6.54% \ \ \
§Jk3.27% \
iWESTi ]
/ ; : EAST;
< *
WIMD SPEED
/ (mfe)
~
¦ >=11.10
¦ 8.80-11.10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 6.41%
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 4 of 9
-------
Event 29
19%
'15.2% \
11.4%
7.58% \
.,3 79% \
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 3.21%
Event 30
WirO SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 3.85%
Event 31
11.1%
58% \
I
6.66%
4.44-%>''"
WirO SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 1.92%
Event 32
Event 33
Event 34
NORTH
13.8%
11.%
'8.25% \
5.5% \ \ \
^2.75% \ \ \ i
;WEST_ J -n,
^ 1 1 | lEASTj
\ 2
V
WIND SPEED
/ (mfe)
~
[¦ >=11.10
¦ 8.80-11.10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 3.21%
14.4%
11.5% \
:WESTlJ-,
7
WIISD
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
1.28%
WIISD
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.54%
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 5 of 9
-------
Event 35
Event 36
Event 37
16.4%
13.1% \
9.81%
'6.54% \
Vj3.27%' '¦
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
3.85%
15.7%
'12.6%
9.42%
6.28% \
WIND
SPEED
(nVs)
m
5= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
5.13%
16.4%
13.1%
iWESTi-
J 1
9.81%
'6.54% \
.3.27%' \
WIND SPEED
(nVs)
m
5= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms: 1.92%
Event 38
Event 39
Event 40
I 20.3%
i '16.2% \
- [ 12.2% \
8.12% \
"V L ,-:i^06% \
WIND SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
4.49%
NORTH
24.2%
'19.4% \
14.5% \
'9.68% \ \
"4.84% \ '1 \ i
;WEsr: t
* ; 1 :EAsf;
WIND SPEED
w w
/ (mfe)
"... ~
[¦ >=11.10
¦ 8.80-11.10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: O.B4%
24.2%
'19.4%
'14.5% \
I 4.84% \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80 -11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.54%
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 6 of 9
-------
Event 41
Event 42
Event 43
j >.19% '
WIND SPEED
(mfe)
"'Vky
.5 24%^,
WirO SPEED
-5.70
-3.60
-2.10
6.02%
3.01 %-'¦
iwesrtl
¦
w
WirO SPEED
(mfe)
H 5.70-8.80
¦ 3.60 - 5.70
d 2.10-3.60
¦ 0.50-2.10
Calms: 3.21%
Event 44
Event 45
Event 46
\ --
WllsD SPEED
(mfe)
HZ 2.10-3.60
NORTH
13 1%
I ; .^N
10.5% \
7.86% \
5.24% \ \ \
l^\
; WHS I i ; ! ! EAST!
WIISD SPEED
/ (mfe)
JIIIUL
X
: Si
Calms: 0.00%
7.47%
'4.98% \
M
v
WIISD SPEED
(mfe)
HZ 2.10-3.60
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 7 of 9
-------
Event 47
Event 48
Event 49
WIND SPEED
(nVs)
-5.70
-3.60
-2.10
9.42% \
6.28% \ \
l 3.14% \ ;
WIND SPEED
-5.70
-3.60
-2.10
i" 11%
J__ 7.32% \ \
^ i *3.66% \
WIND SPEED
(nVs)
-5.70
-3.60
-2.10
Event 50
Event 51
Event 52
WIND SPEED
(rrVs)
IH 2.10-3.60
; WEST
"... 21.2%
14.1 % \
"7.06% \
WIND SPEED
(rrVs)
[_¦ 5.70 - 8.80
3.60 - 5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: Q.0G%
/VBT;
WIND SPEED
(rrVs)
IH 2.10-3.60
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 8 of 9
-------
Event 53
Event 54
Event 55
17%
'13.6% \
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
0.64%
17%
'13.6% \
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
0.00%
15.1%
12%
: 9.03%
J__ 6.02% \
i ^3*01% \
I
WIND SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms: 0.64%
Event 56
19%
'15.2%
7.58%
3.79% \
WIND
SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.B4%
Event 57
¦ *
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80 -11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
1.92%
All Events
10.5%
8.44% \
6.33% \
'4.22% \ \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80 -11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
2.08%
Figure 13. Wind Roses, Radionuclide Sampling Events (Continued)
Page 9 of 9
-------
Event 5
Event 6
Event 7
NORTH
25.5%
20.4% \
'15.3% \
19.2% \ \
A! 5.1% \ 'i \
iWESTi
*
7 ? ; jEAST
wind SPEED
(mte)
SOUTH
~ >=11.10
¦ 8.80-11.10
¦ 5.70 - 8.80
¦ 3.60 - 5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
25.5%
20.4% \
'15.3% \.
10.2% \ \
wind SPEED
(mfe)
!¦
Calms: 0.00%
/
34%
27.2% \
20.4% \.
13.6% \ \
wind SPEED
(mte)
~ >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
¦ 3.60-5.70
I 2.10-3.60
|H 0.50-2.10
Calms: 0.00%
Event 8
Event 9
Event 10
NORTH" ..
29.7%
'23.8% \
17.8% \
11.9% \ \ \
5.95% \ \ \
i WEST i
/' / j : EAST:
WIND SPEED
\
/ / (m's)
1 >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH | 3.60-5.70
1 2.10-3.60
H 0.50-2.10
Calms: 0.00%
55.5%
44.4% \
33.3% \
22.2% \ \ \
'11.1% \ 'i \ \
! ! : EAST:
wire SPEED
(nVs)
rm >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
U 3.60 - 5.70
I 2.10-3.60
H 0.50-2.10
Calms: 0.00%
NORTH" ..
17%
13.6% \
10.2% \
\
'¦ i
;WEST_ T
j ; : EAST:
\ \ /W
WIND SPEED
/ (m's)
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH | 3.60-5.70
1 2.10-3.60
H 0.50-2.10
Calms: 0.00%
Figure 14. Wind Roses, PM^sand Metals Sampling Events
Page 1 of 9
-------
Event 11
Event 12
Event 13
NORTH'"
/ 12.8%
j f-:. '10.2%
/ /
^^55% \
/
.// 1
!west[ T r
k 7 / ; ;BASf!
WIND SPEED
/ (nVs)
I >=11.10
¦ 3.80-11.10
¦ 5.70-8.80
SOUTH IHI 3.60-5.70
1 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
ORTH
21.3%
17!%
1?8%
8 b%
4?:,%*
WCST 1 ^
CAST
/
WIND SPEED
/ / (nVs)
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
OUTH EH 3.60-5.70
1 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
A_5 1%,,
|2.55%^
'10.2%''\
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 0.00%
Event 14
Event 15
Event 16
8.5%
4.25% \
WIND SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
m
0.50-2.10
Calms
0.00%
NORTH
12 8%
1C 2%
/f765%
5
2 35:
w-si 1 4
(-ASI
J
WhCSTCC
im's)
¦ >= 11 13
W
¦ 3 fif. - 11 10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
NORTH
12.8%
iq.2%ji^.
7.65%
;WEST[
; 1 : eastI
tV/
WIND SPEED
/ (fn's)
IB >=11.10
¦ 8.80-11.10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
1 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
Figure 14. Wind Roses, PIVh.sand Metals Sampling Events (Continued)
Page 2 of 9
-------
Event 17
Event 18
Event 19
NORTH
12.8%
7.65%
\] 5 1%,,''''
F .,^2^55% \
iWESTi ; .
: EAST!
WIN3 SPEED
/ (mfe)
~ >=11.10
¦ 3.80-11.10
¦ 5.70-8.80
SOUTH EH 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
/X.--
NORTH
"'X 12.8%
'10.2% \
7.65% \
5.1% \ \ \
2.55% \ \ ; i
IWESTi ^-r-f
! j EAST:
WIND SPEED
/ (mfe)
>=11-10
¦ 8.80-11.10
¦ 5.70-8.80
I 2.10-3.60
Calms: 0.00%
8.5%
<4 25% \
1*
w
wiro SPEED
(mfe)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
~
0.50-2.10
Calms: 0.00%
Event 20
"Inorth
WIND SPEED
j / (mfe)
H >=ii.io
¦ 8.80-11.10
5.70-8.80
iSOLTTH- ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 4.17%
Figure 14. Wind Roses, PIVh.sand Metals Sampling Events (Continued)
Page 3 of 9
-------
Event 23
NORTH
29.7%
23.8%^,
17.8%1
11.9%---''' \ \
j I / / ^ \
,.5.95% ¦¦ ;
-gffi i ! i
i WESTi r
^"7 J ; ^ EASTj
WIND SPEED
/ (mfe)
I >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH |ZB 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 4.17%
Event 24
Event 25
21.3%
17%
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 8.33%
25.5%
20.4% \
15.3%
10.2% \
WIMD SPEED
(nVs)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
_ |SOUTH
¦
3.60 - 5.70
I
2.10-3.60
!¦
0.50-2.10
Calms: 0.00%
Event 26
17%
'12.8% \
8.5%
4.25% \
WIND
SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
Event 27
17%
'13.6%
'10.2% \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
Event 28
21.3%
'l7%/\
'12.8%
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
12.50%
Figure 14. Wind Roses, PIVh.sand Metals Sampling Events (Continued)
Page 4 of 9
-------
Event 29
Event 30
Event 31
NORTH ..
38.3%
30.6% \
23%
15-3% \ \
7.35% '
iWESTi
I : r ; ; EAST!
SOUTH
WIND SPEED
(mfe)
Event 32
NORTH '
21.3%
17!%
12.8% \
...
i
jfwm, \
iWESTii f
~T \ : EAST!
WIND SPEED
/' (nVs)
1 -11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH | 3.60-5.70
I 2.10-3.60
H 0.50-2.10
Calms: 0.00%
WIND SPEED
(mIs)
m
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
¦
0.50-2.10
Calms: 0.00%
Event 33
NORTH '
21.3%
17!%
12.8% \
j ir~-
;
\ WEST ';L T
! EAST;
V'"'-.
WIND SPEED
(m's)
1 -11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH | 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
pi-:
NORTH ..
29.7%
23 8% \
'17.8% \
11 '
...
; i 1
fbw
; EAST!
SOUTH
WIND SPEED
(mfe)
Event 34
/
17%
12.8%
8.5%
5% \
WND SPEED
(nVs)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
I
2.10-3.60
~
0.50-2.10
Calms
0.00%
Figure 14. Wind Roses, PM^sand Metals Sampling Events (Continued)
Page 5 of 9
-------
Event 35
Event 36
Event 37
25.5%
20.4% \
WIND SPEED
(mfe)
m
>= 11.10
i j
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
i
Calms
0.50-2.10
4.17%
c
"'10-2%W'\
<3 4% B
j : i
wiro SPEED
(mfe)
m
>= 11.10
i j
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
4.17%
25.5%
20.4% \
i'WEBft"
'0
j,
r
SOUTH.--
WIND SPEED
(mfe)
-5.70
-3.60
-2.10
Event 38
Event 39
Event 40
17%
'12.8% \
8.5%
4.25% \
WIND SPEED
(mfe)
IH 2.10-3.60
iWESTi
WIND SPEED
(mfe)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
nz
2.10-3.60
r~
0.50-2.10
Calms
0.00%
Figure 14. Wind Roses, PM^sand Metals Sampling Events (Continued)
Page 6 of 9
-------
Event 41
Event 42
Event 43
46.8%
37.4% \
28.1%
18.7% \
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
0.00%
21.3%
17%
8.5%
4.25% A
WIND SPEED
(nVs)
I >=11.10
[¦ 8.80-11.10
I 0.50-2.10
Calms: 8.33%
17%
'13.6% \
'10.2% \
6.8% \ \ \
/ ¦ i \ :
KJ ; : EAST:
SOUTH
WIND SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms: 4.17%
Event 44
Event 45
Event 46
25.5%
20.4% \
'15.3% \
WIND
SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
17%
'12.8% \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
NORTH
21.3%
17!%
12.8% \
/ \:\
'8.5% \ \ \
;L
"4.25% \ \ i
;WBT[
' 1 1 y : EASTi
/
WIND SPEED
/ (mfe)
[¦ >=11.10
¦ 8.80-11.10
5.70-8.80
SOUTH.--'" ¦ 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 8.33%
Figure 14. Wind Roses, PIVh.sand Metals Sampling Events (Continued)
Page 7 of 9
-------
Event 47
Event 48
Event 49
Wir-D SPEED
(nVs)
-5.70
-3.60
-2.10
wiro SPEED
(mfe)
m
5= 11.10
i j
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
25.5%
20.4%
192% \ \ \
, I 1
;WEST! ^ g
; : EAST:
*
SOUTH
WIND SPEED
(mfe)
-5.70
-3.60
-2.10
Event 50
Event 51
Event 52
17%
'12.8% \
8.5%
4.25% \
WIND SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
nz
2.10-3.60
r~
0.50-2.10
Calms
0.00%
25.5%
20.4% \
"... '15.3% \
10.2% \ \
5-1% \ ^ 'i
WIND SPEED
(rrVs)
IH 2.10-3.60
Figure 14. Wind Roses, PM^sand Metals Sampling Events (Continued)
Page 8 of 9
-------
Event 53
Event 54
Event 55
25.5%
20.4% \
15.3%
10.2% \
WIND
SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms
0.00%
34%
27.2% \
wiro SPEED
(nVs)
m
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
i
2.10-3.60
!¦
0.50-2.10
Calms: 0.00%
NORTH
29.7%
23.8%
'17.8% \
11.9% \ \ \
j ; ; ¦' / g.
5 95% \ \ ; i
7 ? ¦ :EAST|
w
WIND SPEED
/ / (nVs)
1 >=11.10
¦ 8.80-11.10
¦ 5.70-8.80
SOUTH EH 3.60-5.70
I 2.10-3.60
¦ 0.50-2.10
Calms: 0.00%
Event 56
17%
'13.6% \
'10.2% \
WIND
SPEED
(m/s)
¦
>= 11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
Event 57
29.7%
23.8% \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
0.00%
All Events
11.5%
9.16% \
6.87% \
4.58% \ \
WIND
SPEED
(m/s)
¦
>=11.10
¦
8.80-11.10
¦
5.70 - 8.80
¦
3.60 - 5.70
2.10-3.60
r~
0.50-2.10
Calms
1.25%
Figure 14. Wind Roses, PIVh.sand Metals Sampling Events (Continued)
Page 9 of 9
-------
-7
- -X'' #
^ ' ;,*j| ¦ j
"S ' s~? % >¦ , *, " ,
^1 '\ ¦ "V » ¦ !>£. ^
A AJaandoned Uranium Mine Site
*$¦ Air Samping Station
C"_2 Navajo Nation Chapter Boundary
Notes:
nVs Meter per second
NTUA Navajo Tribal Utility Authority
Figure 15. Spatial Representativeness Summary
-------
Note:
m/s
Meter per second
o
Q
o
o
o
1
o
"8"
O
0 12 3-
Number of Stations with Radionuclide Data
Note that Events 1, 2, and 3 each have data at 4 stations, but wind speed was not measured during these events.
Figure 16. Temporal Representativeness - Averaged Hourly Wind Speed
-------
Note:
m/s
Meter per second
0
Number of Stations with Radionuclide Data
Note that Events 1, 2, and 3 each have data at 4 stations, but wind speed was not measured during these events.
Figure 17. Temporal Representativeness - Maximum Hourly Wind Speed
-------
270
250
a>
aj
cub 230
CD
~o
210
T3
£=
C
ro
at
190
170
150
0 12 3
Number of Stations with Radionuclide Data
Note that Events 1, 2, and 3 each have data at 4 stations, but wind direction was not measured during these events.
Figure 18. Temporal Representativeness - Averaged Hourly Vector Wind Direction
-------
o
Notes:
|jg/m3
Microgram per cubic meter
|jm
Micrometer
O
O
O
O
O
O
0 0
O
O
O
O
O
0
O
O
O
O
©
0
8
o
o
0
o
O O O
0 ^
Number of Stations with Radionuclide Data
Figure 19. Temporal Representativeness - Averaged PM2.5 Concentration
-------
Note:
|jg/m3 Microgram per cubic meter
Figure 20. Temporal Representativeness - Averaged Arsenic Concentration
-------
0.003
0,0025
0.002
Note:
|jg/m3 Microgram per cubic meter
o
o
o
o
0.0015
0.001
0,0005
O
o
O
o
o
o
'8~
o
o
o
o
0
o
o
4
Figure 21. Temporal Representativeness - Averaged Barium Concentration
-------
)18
J16
Note:
|jg/m3
Microgram per cubic meter
o
0,0014
3 0.001 -
c
-o 0,0008 Z3-
«y
o
0006
O ^
0,0004 g ^
0,0002 -g- O 8
.a.
o
o ° o
o
Figure 22. Temporal Representativeness - Averaged Molybdenum Concentration
-------
Note:
m3
Cubic meter
0.00035
0,0003
0.00025
}
0
t 0.0002
3
2
J
J
0.00015
0,0001
0,00005
0
o
e
o
1
0
o
Figure 23. Temporal Representativeness - Averaged Lead Concentration
-------
>45
B5
103
125
102
115
101
105
0
Note:
|jg/m3 Microgram per cubic meter
o
Q
o i
Figure 24. Temporal Representativeness
2 i 4
- Averaged Vanadium Concentration
-------
TABLES
-------
Table 1. Field Sampling Summary - Radionuclides
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(36.55600°,
-109.23242°)
Cove Day
School
(36.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
1
2/10/2020
2/17/2020
R
R
R
R2
R
4
1
2
2/18/2020
2/25/2020
R
R
R
R2
R
4
1
3
2/25/2020
3/3/2020
R
R
R
R
R
4
1
2020
4
3/3/2020
3/10/2020
R
R
R
R
R
4
1
5
3/10/2020
3/17/2020
R
R
R
R2
R*
4
0
6
3/17/2020
3/25/2020
R
R
R
R
R
4
1
7
3/24/2020
3/31/2020
R2
R
R
R
R
4
1
8
5/11/2021
5/18/2021
R2
R
R
R
R*
4
0
9
5/18/2021
5/25/2021
R
R
R
R
--
4
0
10
5/25/2021
6/2/2021
R2*
R*
R*
R
R*
2
0
11
6/2/2021
6/8/2021
R*
R*
R
R
R*
2
0
12
6/8/2021
6/15/2021
R2*
R*
R
R
R*
3
0
13
6/15/2021
6/22/2021
R*
R*
R*
R
R
1
1
14
6/22/2021
6/29/2021
--
--
--
R
R
1
1
15
6/29/2021
7/6/2021
--
--
--
R
R
1
1
16
7/6/2021
7/13/2021
--
--
--
R
R
1
1
2021
17
7/13/2021
7/20/2021
--
--
--
R*
R
0
1
18
7/20/2021
7/27/2021
--
--
--
R*
R
0
1
19
7/27/2021
8/3/2021
--
--
--
R*
--
0
0
20
8/3/2021
8/10/2021
--
--
--
--
--
0
0
21
8/10/2021
8/17/2021
--
--
--
--
~
0
0
22
8/17/2021
8/24/2021
--
R
--
R
~
2
0
23
8/24/2021
8/31/2021
--
R
--
R
~
2
0
24
8/31/2021
9/7/2021
--
R
--
R
--
2
0
25
9/7/2021
9/14/2021
--
R
~
R
~
2
0
26
9/14/2021
9/21/2021
R
R
R
R
R
4
1
Page 1 of 3
-------
Table 1. Field Sampling Summary - Radionuclides (Continued)
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(36.55600°,
-109.23242°)
Cove Day
School
(36.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
27
9/21/2021
9/28/2021
R
R
R
R
R
4
1
28
9/28/2021
10/5/2021
R
R
R
R
R
4
1
29
10/5/2021
10/12/2021
R
R
R
R
R
4
1
30
10/12/2021
10/19/2021
R
R*
R*
R
R
2
1
31
10/19/2021
10/26/2021
R*
R*
R
R
R
2
1
32
10/26/2021
11/2/2021
--
--
R*
R*
R*
0
0
33
11/2/2021
11/9/2021
--
--
--
--
--
0
0
2021
34
11/9/2021
11/16/2021
--
--
--
--
--
0
0
35
11/16/2021
11/23/2021
--
--
--
~
~
0
0
36
11/23/2021
11/30/2021
--
R
--
R
--
2
0
37
11/30/2021
12/7/2021
--
R
--
R
R
2
1
38
12/7/2021
12/14/2021
--
R
--
R
R
2
1
39
12/14/2021
12/21/2021
--
R
--
R*
R
1
1
40
12/21/2021
12/28/2021
--
R
--
R*
R
1
1
41
12/28/2021
1/4/2022
-
R
--
R*
R*
1
0
42
1/4/2022
1/11/2022
--
--
--
~
~
0
0
43
1/11/2022
1/18/2022
--
--
--
~
~
0
0
44
1/18/2022
1/25/2022
--
--
--
~
~
0
0
45
3/22/2022
3/29/2022
R
R
R2
R
R
4
1
2022
46
3/29/2022
4/5/2022
R
R*
R2
R
R
3
1
47
4/5/2022
4/12/2022
R
R
R2
R
R
4
1
48
4/12/2022
4/19/2022
R
R
R2
R
R
4
1
49
4/19/2022
4/26/2022
R
R2
R*
R*
R
3
1
50
4/26/2022
5/3/2022
R
R2
R
R
R
4
1
51
5/3/2022
5/10/2022
R
R2
R
R
R
4
1
Page 2 of 3
-------
Table 1. Field Sampling Summary - Radionuclides (Continued)
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(36.55600°,
-109.23242°)
Cove Day
School
(36.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
52
5/10/2022
5/17/2022
R
R2
R
R
R
4
1
53
5/17/2022
5/24/2022
R
R
R
R
R2
4
1
2022
54
5/24/2022
5/31/2022
R
R
R
R
R2
4
1
55
5/31/2022
6/7/2022
R
R
R
R
R2
4
1
56
6/7/2022
6/14/2022
R
R
R
R
R2
4
1
57
6/14/2022
6/21/2022
R
R
R
R
R2
4
1
Total
134
35
Notes:
* A sample was collected, but the result was rejected. See Section 3.4 for discussion.
Sample was not collected this week because of equipment failure (or in the case of Event 7, not analyzed because of expired holding time).
NTUA Navajo Tribal Utility Authority
R Radionuclide sample was collected for this location and event
R2 Radionuclide sample and duplicate were collected for this location and week
Page 3 of 3
-------
Table 2. Field Sampling Summary - Metals and PM2.5
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(35.55600°,
-109.23242°)
Cove Day
School
(35.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
1
2/10/2020
2/17/2020
M
M
M
M2
M
4
1
2
2/18/2020
2/25/2020
M
M
M
M2
M
4
1
3
2/25/2020
3/3/2020
M
M
M
M
M
4
1
2020
4
3/3/2020
3/10/2020
M
M
M
M
M
4
1
5
3/10/2020
3/17/2020
M
M
M
M2
M
4
1
6
3/17/2020
3/25/2020
M
M
M
M
M
4
1
7
3/24/2020
3/31/2020
-
--
--
--
--
0
8
5/11/2021
5/18/2021
M2
M
M
M
M
4
1
9
5/18/2021
5/25/2021
M
M
M
M
M
4
1
10
5/25/2021
6/2/2021
M2
M
M
M
M
4
1
11
6/2/2021
6/8/2021
M
M
M
M
M
4
1
12
6/8/2021
6/15/2021
M2
M
M
M
M
4
1
13
6/15/2021
6/22/2021
M
M
M
M
M
4
1
14
6/22/2021
6/29/2021
M2
M
M
M
M
4
1
15
6/29/2021
7/6/2021
M
M
M
M
M
4
1
16
7/6/2021
7/13/2021
M2
M
M
M
M
4
1
2021
17
7/13/2021
7/20/2021
M
M
M
M
M
4
1
18
7/20/2021
7/27/2021
M
M
M2
M
M2
4
1
19
7/27/2021
8/3/2021
M
M
M
M
M
4
1
20
8/3/2021
8/10/2021
M
M
M2
M
M2
4
1
21
8/10/2021
8/17/2021
M
M
M
M
M
4
1
22
8/17/2021
8/24/2021
M
M
M
M
M2
4
1
23
8/24/2021
8/31/2021
M
M
M
M
M
4
1
24
8/31/2021
9/7/2021
M
M
M
M
M2
4
1
25
9/7/2021
9/14/2021
M
M
M
M
M
4
1
26
9/14/2021
9/21/2021
M
M
M
M
M2
4
1
Page 1 of 3
-------
Table 2. Field Sampling Summary - Metals and PM2.5 (Continued)
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(35.55600°,
-109.23242°)
Cove Day
School
(35.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
27
9/21/2021
9/28/2021
M
M
M
M
M
4
1
28
9/28/2021
10/5/2021
M
M2
M
M
M
4
1
29
10/5/2021
10/12/2021
M
M
M
M
M
4
1
30
10/12/2021
10/19/2021
M
M2
M
M
M
4
1
31
10/19/2021
10/26/2021
M
M
M
M
M
4
1
32
10/26/2021
11/2/2021
M
M2
M
M
M
4
1
33
11/2/2021
11/9/2021
M
M
M
M
M
4
1
2021
34
11/9/2021
11/16/2021
M
M2
M
M
M
4
1
35
11/16/2021
11/23/2021
M
M
M
M
M
4
1
36
11/23/2021
11/30/2021
M
M2
M
M
M
4
1
37
11/30/2021
12/7/2021
M
M
M
M
M
4
1
38
12/7/2021
12/14/2021
M
M2
M
M
M
4
1
39
12/14/2021
12/21/2021
M
M
M
M
M
4
1
40
12/21/2021
12/28/2021
M
M
M2
M
M
4
1
41
12/28/2021
1/4/2022
M
M
M
M
M
4
1
42
1/4/2022
1/11/2022
M
M
M2
M
M
4
1
43
1/11/2022
1/18/2022
M
M
M
M
M
4
1
44
1/18/2022
1/25/2022
M
M
M2
M
M
4
1
45
3/22/2022
3/29/2022
M
M
M
M
M
4
1
2022
46
3/29/2022
4/5/2022
M
M
M2
M
M
4
1
47
4/5/2022
4/12/2022
M
M
M
M
M
4
1
48
4/12/2022
4/19/2022
M
M
M2
M
M
4
1
49
4/19/2022
4/26/2022
M
M
M
M
M
4
1
50
4/26/2022
5/3/2022
M
M2
M
M
M
4
1
51
5/3/2022
5/10/2022
M
M
M
M
M
4
1
Page 2 of 3
-------
Table 2. Field Sampling Summary - Metals and PM2.5 (Continued)
Stations Sampled (Latitude and Longitude)
Usable Results (not
including duplicates)
Year
Event
Start Date
End Date
Residential
(35.55600°,
-109.23242°)
Cove Day
School
(35.55533°,
-109.23242°)
Cove Water
Tower
(36.56425°,
-109.21747°)
Cove Chapter
House
(36.56425°,
-109.19386°)
NTUA Pump
Station
(36.59022°,
-109.11764°)
Cove
Reference
52
5/10/2022
5/17/2022
M
M2
M
M
M
4
1
53
5/17/2022
5/24/2022
M
M
M
M
M
4
1
2022
54
5/24/2022
5/31/2022
M
M
M
M
M2
4
1
55
5/31/2022
6/7/2022
M
M
M
M
M
4
1
56
6/7/2022
6/14/2022
M
M
M
M
M2
4
1
57
6/14/2022
6/21/2022
M
M
M
M
M
4
1
Total
224
56
Notes:
Sample was not analyzed this week because of expired holding time.
M Metals and PM2.5 sample was collected for this location and event.
M2 Metals and PM2.5 sample and duplicate were collected for this location and event.
NTUA Navajo Tribal Utility Authority
PM2.5 Particulate matter less than 2.5 micrometers in diameter
Page 3 of 3
-------
Table 3. Summary Statistics - Radionuclides, All Cove Stations
Analyte
Project Action Limit
(pCi/m3)
Location
Detection
Frequency
Minimum
Concentration
(pCi/m3)
Maximum
Concentration
(pCi/m3)
Exceedances
QAPP PAL
Alternate PAL
Radium-226
3.15E-02
1.05E-02
All Stations
61 /130
9.36E-05
2.77E-04
None
Radium-228
9.90E-03
3.30E-03
All Stations
4/134
1.87E-04
1.24E-03
None
Thorium-230
2.00E-02
6.67E-03
All Stations
27/134
1.40E-04
2.27E-04
None
Thorium-232
8.05E-03
2.68E-03
All Stations
70/134
8.88E-05
2.02E-04
None
Uranium-234
1.54E-02
5.13E-03
All Stations
57/134
6.87E-05
1.87E-04
None
Uranium-235
5.93E-03
1.98E-03
All Stations
6/134
1.21E-05
2.56E-05
None
Uranium-238
1.29E-02
4.80E-03
All Stations
55/134
6.50E-05
1.90E-04
None
Gross Alpha
Not applicable
Not applicable
All Stations
130/130
7.74E-04
1.10E-02
None
Gross Beta
Not applicable
Not applicable
All Stations
130/130
1.16E-02
4.53E-02
None
Notes:
PALs listed are per the QAPP and are based on USEPA preliminary remediation goals for a target cancer risk of 3E-04. The alternate PALs are based on USEPA
preliminary remediation goals for a target cancer risk of 1E-04.
PAL Project action limit
pCi/m3 Picocurie per cubic meter
QAPP Quality assurance project plan
USEPA U.S. Environmental Protection Agency
Page 1 of 1
-------
Table 4. Summary Statistics - Radionuclides, by Analyte and Station
Analyte
Project Action Limit
(pCi/m3)
Location
Detection
Frequency
Minimum
Concentration
(pCi/m3)
Maximum
Concentration
(pCi/m3)
Exceedances
QAPP PAL
Alternate PAL
Radium-226
3.15E-02
1.05E-02
Residential
13/29
9.76E-05
2.32E-04
None
Cove Day School
13/34
9.56E-05
2.33E-04
None
Cove Water Tower
18/27
9.91 E-05
2.77E-04
None
Cove Chapter House
17/40
9.36E-05
2.15E-04
None
NTUA Pump Station
15/34
1.04E-04
2.24E-04
None
Field Blank
47/47
5.55E-05
1.27E-04
None
Radium-228
9.90E-03
3.30E-03
Residential
1 / 29
1.23E-03
1.23E-03
None
Cove Day School
1 / 36
9.85E-04
9.85E-04
None
Cove Water Tower
0/28
--
--
None
Cove Chapter House
2/41
1.87E-04
1.24E-03
None
NTUA Pump Station
0/35
--
--
None
Field Blank
3/49
8.65E-04
1.76E-03
None
Thorium-
230
2.00E-02
6.67E-03
Residential
6/29
1.49E-04
2.13E-04
None
Cove Day School
6/36
1.43E-04
2.27E-04
None
Cove Water Tower
11/28
1.40E-04
1.89E-04
None
Cove Chapter House
4/41
1.40E-04
1.70E-04
None
NTUA Pump Station
9/35
1.25E-04
2.48E-04
None
Field Blank
37/49
5.51 E-05
2.10E-04
None
Thorium-
232
8.05E-03
2.68E-03
Residential
13/29
1.01E-04
1.94E-04
None
Cove Day School
18/36
8.88E-05
1.97E-04
None
Cove Water Tower
18/28
9.81 E-05
1.92E-04
None
Cove Chapter House
21 / 41
9.76E-05
2.02E-04
None
NTUA Pump Station
18/35
1.02E-04
1.54E-04
None
Field Blank
45/49
2.86E-05
1.31E-04
None
Page 1 of 3
-------
Table 4. Summary Statistics - Radionuclides, by Analyte and Station (Continued)
Analyte
Project Action Limit
(pCi/m3)
Location
Detection
Frequency
Minimum
Concentration
(pCi/m3)
Maximum
Concentration
(pCi/m3)
Exceedances
QAPP PAL
Alternate PAL
Uranium-
234
1.54E-02
5.13E-03
Residential
9/29
6.87E-05
1.35E-04
None
Cove Day School
19/36
6.88E-05
1.55E-04
None
Cove Water Tower
17/28
6.98E-05
1.87E-04
None
Cove Chapter House
12/41
7.30E-05
1.14E-04
None
NTUA Pump Station
16/35
7.60E-05
1.34E-04
None
Field Blank
48/49
4.30E-05
9.52E-05
None
Uranium-
235
5.93E-03
1.98E-03
Residential
1 / 29
2.13E-05
2.13E-05
None
Cove Day School
2/36
1.97E-05
2.56E-05
None
Cove Water Tower
1 / 28
1.21E-05
1.21E-05
None
Cove Chapter House
2/41
1.24E-05
1.38E-05
None
NTUA Pump Station
1 / 35
1.65E-05
1.65E-05
None
Field Blank
0/49
-
-
None
Uranium-
238
1.29E-02
4.30E-03
Residential
14/29
7.20E-05
1.39E-04
None
Cove Day School
16/36
7.39E-05
1.90E-04
None
Cove Water Tower
15/28
7.65E-05
1.56E-04
None
Cove Chapter House
10/41
6.50E-05
1.32E-04
None
NTUA Pump Station
11/35
7.97E-05
1.17E-04
None
Field Blank
48/49
3.00E-05
1.01 E-04
None
Gross Alpha
Not
applicable
Not applicable
Residential
28/28
1.02E-03
1.04E-02
None
Cove Day School
36/36
9.90E-04
1.10E-02
None
Cove Water Tower
27/27
8.41 E-04
9.76E-03
None
Cove Chapter House
39/39
7.74E-04
9.77E-03
None
NTUA Pump Station
31 / 33
8.63E-04
1.07E-02
None
Field Blank
26/46
1.68E-04
8.88E-04
None
Page 2 of 3
-------
Table 4. Summary Statistics - Radionuclides, by Analyte and Station (Continued)
Analyte
Project Action Limit
(pCi/m3)
Location
Detection
Frequency
Minimum
Concentration
(pCi/m3)
Maximum
Concentration
(pCi/m3)
Exceedances
QAPP PAL
Alternate PAL
Gross
Beta
Not applicable
Not applicable
Residential
28/28
1.16E-02
3.02E-02
None
Cove Day School
36/36
1.20E-02
4.53E-02
None
Cove Water Tower
27/27
1.27E-02
3.51 E-02
None
Cove Chapter House
39/39
1.25E-02
4.50E-02
None
NTUA Pump Station
32/33
9.50E-03
4.67E-02
None
Field Blank
46/46
4.09E-03
6.24E-03
None
Notes:
PALs listed are per the QAPP and are based on USEPA preliminary remediation goals for a target cancer risk of 3E-04. The alternate PALs are based on USEPA
preliminary remediation goals for a target cancer risk of 1E-04.
NTUA Navajo Tribal Utility Authority
PAL Project action limit
pCi/m3 Picocurie per cubic meter
QAPP Quality assurance project plan
USEPA U.S. Environmental Protection Agency
Page 3 of 3
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
1
4.77E-04
2.80E-04
3
3.77E-04
2.90E-04
6
4.24E-04
2.90E-04
8
5.24E-04
2.80E-04
10
3.35E-04
2.80E-04
11
2.87E-04
2.80E-04
12
3.65E-04
3.10E-04
14
5.54E-04
3.10E-04
16
4.13E-04
3.00E-04
18
3.66E-04
3.00E-04
Gross Alpha
22
4.05E-04
3.20E-04
25
4.52E-04
3.20E-04
29
3.57E-04
3.20E-04
36
5.72E-04
3.40E-04
39
3.83E-04
3.40E-04
45
5.72E-04
2.70E-04
48
8.88E-04
2.90E-04
50
4.80E-04
2.60E-04
51
4.33E-04
2.60E-04
52
2.84E-04
2.80E-04
54
6.13E-04
2.80E-04
1
4.76E-03
5.60E-04
2
4.91 E-03
5.40E-04
3
5.12E-03
5.60E-04
4
5.08E-03
5.60E-04
5
5.05E-03
5.60E-04
6
5.56E-03
5.70E-04
7
4.79E-03
5.60E-04
8
4.77E-03
5.60E-04
9
5.65E-03
5.50E-04
Gross Beta
10
4.65E-03
5.50E-04
11
5.22E-03
5.50E-04
12
5.41 E-03
5.60E-04
13
4.86E-03
5.50E-04
14
5.18E-03
5.70E-04
15
4.87E-03
5.50E-04
16
4.98E-03
5.60E-04
17
4.54E-03
5.50E-04
18
4.30E-03
5.60E-04
19
4.57E-03
5.50E-04
Page 1 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
22
4.74E-03
5.60E-04
23
6.24E-03
5.50E-04
24
4.55E-03
5.60E-04
25
5.24E-03
5.70E-04
26
5.26E-03
5.60E-04
27
4.70E-03
5.60E-04
28
5.25E-03
5.50E-04
29
5.17E-03
5.60E-04
36
4.28E-03
5.90E-04
37
5.49E-03
5.70E-04
38
4.80E-03
5.70E-04
39
5.26E-03
5.80E-04
Gross Beta
(continued)
40
4.09E-03
5.50E-04
41
5.27E-03
5.60E-04
45
4.17E-03
5.60E-04
46
4.51 E-03
5.40E-04
47
4.89E-03
5.50E-04
48
6.02E-03
5.80E-04
49
5.42E-03
5.50E-04
50
4.67E-03
5.70E-04
51
5.06E-03
5.60E-04
52
5.32E-03
5.50E-04
53
5.46E-03
5.50E-04
54
4.86E-03
5.70E-04
55
5.46E-03
5.60E-04
56
6.07E-03
5.60E-04
57
4.57E-03
5.60E-04
1
5.72E-05
2.39E-05
2
9.62E-05
1.72E-05
3
6.91 E-05
1.34E-05
4
5.97E-05
1.44E-05
5
8.06E-05
2.30E-05
6
8.61 E-05
1.85E-05
Radium-226
7
8.41 E-05
1.94E-05
8
9.06E-05
2.36E-05
10
8.83E-05
3.34E-05
12
7.87E-05
3.00E-05
13
1.03E-04
2.39E-05
14
1.08E-04
2.83E-05
15
9.50E-05
3.92E-05
Page 2 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
16
7.72E-05
3.04E-05
17
1.18E-04
2.18E-05
18
1.20E-04
3.16E-05
19
9.09E-05
3.26E-05
22
1.24E-04
2.16E-05
23
8.56E-05
5.24E-05
24
5.93E-05
3.98E-05
25
6.70E-05
4.27E-05
26
5.55E-05
1.75E-05
27
7.59E-05
1.82E-05
28
8.62E-05
1.96E-05
29
1.16E-04
2.08E-05
30
7.12E-05
2.32E-05
31
7.12E-05
1.78E-05
Radium-226
32
1.24E-04
2.35E-05
(continued)
36
6.83E-05
2.05E-05
37
9.83E-05
1.77E-05
38
1.06E-04
2.52E-05
39
8.27E-05
1.61 E-05
40
8.46E-05
2.80E-05
41
9.53E-05
2.44E-05
45
9.40E-05
1.83E-05
46
9.51 E-05
2.09E-05
47
9.73E-05
1.82E-05
48
1.02E-04
3.16E-05
49
1.02E-04
2.07E-05
50
1.05E-04
1.83E-05
51
7.94E-05
2.99E-05
52
1.11 E-04
1.94E-05
53
1.27E-04
2.91 E-05
Radium-228
29
1.76E-03
1.62E-03
2
9.17E-05
8.77E-05
8
9.28E-05
5.96E-05
9
8.87E-05
6.17E-05
12
1.06E-04
8.98E-05
Thorium-230
13
1.18E-04
8.74E-05
14
1.38E-04
9.26E-05
15
1.02E-04
9.42E-05
17
8.61 E-05
8.53E-05
22
1.39E-04
8.61 E-05
Page 3 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
23
1.59E-04
8.86E-05
25
1.09E-04
8.89E-05
26
1.31E-04
8.47E-05
27
8.62E-05
8.36E-05
29
1.66E-04
8.92E-05
Thorium-230
31
1.52E-04
8.47E-05
(continued)
32
1.08E-04
8.56E-05
36
8.49E-05
8.44E-05
46
2.10E-04
8.47E-05
47
9.33E-05
8.78E-05
50
9.04E-05
8.11 E-05
53
8.75E-05
8.42E-05
1
3.76E-05
3.71 E-05
2
4.66E-05
3.67E-05
3
4.87E-05
3.53E-05
5
6.45E-05
3.10E-05
6
6.50E-05
3.14E-05
7
5.84E-05
3.22E-05
8
4.95E-05
1.69E-05
9
6.11E-05
2.32E-05
10
4.87E-05
3.18E-05
11
5.43E-05
2.86E-05
12
7.47E-05
3.57E-05
13
6.46E-05
2.94E-05
14
8.08E-05
3.40E-05
Thorium-232
16
3.96E-05
3.16E-05
17
6.15E-05
2.81 E-05
18
3.75E-05
3.71 E-05
19
7.92E-05
2.52E-05
22
5.56E-05
2.65E-05
23
6.37E-05
3.32E-05
24
4.80E-05
3.49E-05
25
5.06E-05
2.87E-05
26
5.91 E-05
2.89E-05
27
4.83E-05
2.78E-05
28
5.52E-05
3.58E-05
29
8.17E-05
3.65E-05
30
5.95E-05
3.70E-05
31
7.65E-05
3.66E-05
Page 4 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
32
5.45E-05
3.03E-05
39
7.32E-05
2.61 E-05
40
5.91 E-05
3.15E-05
45
5.42E-05
2.85E-05
46
5.23E-05
2.98E-05
47
7.40E-05
3.53E-05
48
5.79E-05
3.03E-05
Thorium-232
49
5.85E-05
2.99E-05
(continued)
50
8.54E-05
2.82E-05
51
8.96E-05
3.35E-05
52
1.10E-04
3.29E-05
53
6.94E-05
3.13E-05
54
4.53E-05
3.62E-05
55
1.31E-04
3.78E-05
56
4.58E-05
3.50E-05
57
7.70E-05
3.91 E-05
1
8.63E-05
1.99E-05
2
4.74E-05
2.67E-05
3
5.38E-05
2.39E-05
4
7.01 E-05
2.59E-05
5
8.47E-05
1.96E-05
6
7.23E-05
1.96E-05
7
9.52E-05
1.91 E-05
8
4.99E-05
1.56E-05
9
7.73E-05
1.66E-05
10
8.12E-05
2.14E-05
Uranium-234
11
6.70E-05
1.60E-05
12
5.83E-05
2.45E-05
13
4.76E-05
2.31 E-05
14
4.30E-05
2.48E-05
15
5.87E-05
2.96E-05
16
7.86E-05
3.08E-05
17
7.23E-05
2.73E-05
19
8.43E-05
2.64E-05
22
5.24E-05
2.73E-05
23
7.80E-05
2.80E-05
24
7.49E-05
1.88E-05
Page 5 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
25
5.49E-05
1.96E-05
26
6.67E-05
1.67E-05
27
5.19E-05
1.63E-05
28
6.53E-05
1.86E-05
29
6.51 E-05
1.94E-05
30
6.87E-05
1.95E-05
31
5.47E-05
2.02E-05
32
6.78E-05
1.93E-05
36
8.01 E-05
2.44E-05
37
7.70E-05
1.92E-05
38
6.56E-05
1.57E-05
39
7.64E-05
1.60E-05
Uranium-234
(continued)
40
6.48E-05
2.34E-05
41
7.72E-05
2.43E-05
45
6.64E-05
1.58E-05
46
8.92E-05
1.60E-05
47
8.77E-05
1.63E-05
48
8.03E-05
2.43E-05
49
5.79E-05
1.71 E-05
50
6.49E-05
1.71 E-05
51
8.21 E-05
1.97E-05
52
5.57E-05
2.11 E-05
53
8.25E-05
2.35E-05
54
7.75E-05
2.43E-05
55
6.88E-05
1.82E-05
56
7.26E-05
2.53E-05
57
7.15E-05
1.99E-05
1
6.04E-05
1.99E-05
2
5.13E-05
2.67E-05
3
6.22E-05
1.95E-05
4
5.18E-05
2.92E-05
5
5.40E-05
2.40E-05
Uranium-238
6
7.55E-05
1.96E-05
7
3.62E-05
2.52E-05
8
8.29E-05
2.06E-05
9
4.62E-05
1.66E-05
10
5.24E-05
1.55E-05
11
3.83E-05
1.60E-05
12
3.97E-05
1.99E-05
Page 6 of 7
-------
Table 5. Radionuclide Field Blank Detections Above the Minimum Detectable
Concentration (Continued)
Analyte
Sampling Week
Detected Concentration
(pCi/m3)
Minimum Detectable
Concentration
(pCi/m3)
13
5.51 E-05
2.31 E-05
14
6.32E-05
2.48E-05
15
3.00E-05
2.41 E-05
16
4.82E-05
2.34E-05
17
8.80E-05
2.73E-05
19
6.29E-05
2.64E-05
22
4.20E-05
2.42E-05
23
5.52E-05
2.49E-05
24
3.99E-05
2.31 E-05
25
5.49E-05
1.96E-05
26
5.67E-05
1.67E-05
27
1.01E-04
1.63E-05
28
6.73E-05
2.09E-05
29
6.09E-05
2.19E-05
30
5.92E-05
2.57E-05
31
5.14E-05
2.66E-05
32
4.28E-05
1.93E-05
Uranium-238
36
6.31 E-05
2.27E-05
(continued)
37
8.12E-05
2.36E-05
38
7.39E-05
1.92E-05
39
4.78E-05
1.60E-05
40
5.35E-05
2.14E-05
41
7.29E-05
1.98E-05
45
4.21 E-05
2.19E-05
46
6.80E-05
2.21 E-05
47
6.50E-05
1.63E-05
48
6.42E-05
1.61 E-05
49
8.17E-05
1.71 E-05
50
6.03E-05
2.10E-05
51
8.43E-05
2.22E-05
52
4.46E-05
1.87E-05
53
5.99E-05
2.09E-05
54
8.27E-05
2.98E-05
55
5.55E-05
2.51 E-05
56
7.40E-05
2.06E-05
57
6.62E-05
2.45E-05
Note:
pCi/m3 Picocurie per cubic meter
Page 7 of 7
-------
Table 6. Radionuclide Field Duplicate Result Summary
Analyte
Sampling
Week
Location
Original
Concentration
(pCi/m3)
Field Duplicate
Concentration
(pCi/m3)
Relative
Percent
Difference
1
Cove Chapter House
8.34E-03
7.44E-03
11%
2
Cove Chapter House
9.44E-03
1.01E-02
7%
5
Cove Chapter House
4.72E-03
4.28E-03
10%
7
Residential
5.40E-03
6.60E-03
20%
8
Residential
2.94E-03
2.12E-03
32%
10
Residential
1.41E-03
1.04E-03
30%
45
Water Tower
8.72E-04
1.00E-03
14%
47
Water Tower
1.20E-03
1.19E-03
1%
Gross
48
Water Tower
1.17E-03
1.50E-03
25%
Alpha
49
Cove Day School
1.59E-03
1.61E-03
1%
50
Cove Day School
2.32E-03
2.77E-03
18%
51
Cove Day School
1.30E-03
1.30E-03
0%
52
Cove Day School
1.50E-03
1.77E-03
17%
53
NTUA Pump House
1.35E-03
1.67E-03
21%
54
NTUA Pump House
6.25E-04
1.24E-03
66%
55
NTUA Pump House
1.03E-03
1.67E-03
47%
56
NTUA Pump House
1.35E-03
2.19E-03
47%
57
NTUA Pump House
1.76E-03
1.86E-03
6%
1
Cove Chapter House
2.72E-02
2.21 E-02
21%
2
Cove Chapter House
2.78E-02
2.73E-02
2%
5
Cove Chapter House
1.29E-02
1.21 E-02
6%
7
Residential
1.85E-02
1.84E-02
1%
8
Residential
2.84E-02
2.39E-02
17%
10
Residence
7.04E-03
2.54E-02
113%
45
Water Tower
1.68E-02
1.88E-02
11%
46
Water Tower
1.79E-02
9.27E-03
64%
47
Water Tower
1.79E-02
2.13E-02
17%
Gross Beta
48
Water Tower
2.04E-02
2.34E-02
14%
49
Cove Day School
2.40E-02
2.43E-02
1%
50
Cove Day School
2.93E-02
3.10E-02
6%
51
Cove Day School
2.17E-02
2.18E-02
0%
52
Cove Day School
2.23E-02
2.36E-02
6%
53
NTUA Pump House
2.22E-02
2.70E-02
20%
54
NTUA Pump House
1.85E-02
2.14E-02
15%
55
NTUA Pump House
1.95E-02
2.29E-02
16%
56
NTUA Pump House
1.95E-02
2.55E-02
27%
57
NTUA Pump House
1.81E-02
2.31 E-02
24%
Thorium-
230
53
NTUA Pump House
1.53E-04
1.94E-04
24%
55
NTUA Pump House
2.51 E-04
2.45E-04
2%
56
NTUA Pump House
1.97E-04
2.24E-04
13%
Page 1 of 2
-------
Table 6. Radionuclide Field Duplicate Result Summary (Continued)
Analyte
Sampling
Week
Location
Original
Concentration
(pCi/m3)
Field Duplicate
Concentration
(pCi/m3)
Relative
Percent
Difference
Thorium-
232
2
Cove Chapter House
1.25E-04
1.14E-04
9%
8
Residential
1.11 E-04
1.19E-04
7%
49
Cove Day School
1.09E-04
1.29E-04
17%
51
Cove Day School
1.33E-04
1.40E-04
5%
53
NTUA Pump House
1.37E-04
1.70E-04
21%
54
NTUA Pump House
1.09E-04
1.37E-04
23%
49
Cove Day School
1.09E-04
1.48E-04
17%
Uranium-
234
45
Water Tower
7.06E-05
6.90E-05
2%
47
Water Tower
1.02E-04
1.19E-04
15%
49
Cove Day School
1.11 E-04
9.80E-05
12%
50
Cove Day School
9.05E-05
9.61 E-05
6%
51
Cove Day School
1.09E-04
9.18E-05
17%
52
Cove Day School
8.72E-05
8.94E-05
2%
53
NTUA Pump House
1.06E-04
1.07E-04
1%
54
NTUA Pump House
1.01 E-04
9.29E-05
8%
56
NTUA Pump House
7.36E-05
7.84E-05
6%
57
NTUA Pump House
8.40E-05
1.03E-04
20%
Uranium-
238
45
Water Tower
1.26E-05
1.15E-05
9%
45
Water Tower
7.06E-05
8.24E-05
15%
47
Water Tower
8.01 E-05
9.47E-05
17%
49
Cove Day School
9.81 E-05
1.40E-04
35%
50
Cove Day School
7.19E-05
9.90E-05
32%
51
Cove Day School
1.01 E-04
9.94E-05
2%
53
NTUA Pump House
7.03E-05
1.05E-04
40%
54
NTUA Pump House
1.20E-04
8.43E-05
35%
Notes:
Results are only shown for field duplicate pairs for which both analytes were detected.
NTUA Navajo Tribal Utility Authority
pCi/m3 Picocurie per cubic meter
Page 2 of 2
-------
Table 7. Summary Statistics - Metals and PM2.5, All Cove Stations
Analyte
Project Action Limit
(MQ/m3)
Location
Detection
Frequency
Minimum
Concentration
(MQ/m3)
Maximum
Concentration
(MQ/m3)
Exceedances
QAPP PAL
Alternate
PAL
Arsenic
0.00156
0.00156
All Stations
34 / 224
0.000087
0.00029
None
Barium
0.052
0.052
All Stations
166/224
0.0000985
0.0032
None
Lead
0.15
0.15
All Stations
109/224
0.000088
0.0039
None
Molybdenum
0.209
0.209
All Stations
15/224
0.000084
0.00036
None
Selenium
2.09
2.09
All Stations
1 / 224
0.0005
0.0005
None
Uranium
0.00417
0.00417
All Stations
2/224
0.000084
0.000086
None
Vanadium
0.0104
0.0104
All Stations
48 / 224
0.000093
0.00039
None
PM2.5
35
35
All Stations
204 / 224
0.0416
12.74
None
Notes:
PALs are per the QAPP and are based on USEPA regional screening levels for a target cancer risk of 3E-04 and a target noncancer hazard quotient of 0.1.
Alternate PALs are based on USEPA regional screening levels for a target cancer risk of 1E-04 and a target noncancer hazard quotient of 0.1. The PM2.5 PAL is
from the National Ambient Air Quality Standard for PM2.5.
|jg/m3 Microgram per cubic meter
PAL Project action limit
PM2.5 Particulate matter less than 2.5 micrometers in diameter
QAPP Quality assurance project plan
USEPA U.S. Environmental Protection Agency
Page 1 of 1
-------
Table 8. Summary Statistics - Metals and PM2.5, by Analyte and Station
Analyte
Project Action Limit
(MQ/m3)
Location
Detection
Frequency
Minimum
Concentration
(MQ/m3)
Maximum
Concentration
(MQ/m3)
Exceedances
QAPP PAL
Alternate PAL
Arsenic
0.00156
0.00156
Residential
11/56
0.000087
0.00029
None
Cove Day School
9/56
0.00011
0.00026
None
Cove Water Tower
6/56
0.0001
0.00028
None
Cove Chapter House
8/56
0.0000915
0.0002
None
NTUA Pump Station
8/56
0.000087
0.00017
None
Field Blank
1 / 56
0.00013
0.00013
None
Barium
0.052
0.052
Residential
42/56
0.00013
0.0024
None
Cove Day School
41 / 56
0.00014
0.00215
None
Cove Water Tower
40/56
0.00012
0.002
None
Cove Chapter House
43/56
0.0000985
0.0032
None
NTUA Pump Station
47/56
0.00015
0.007
None
Field Blank
15/56
0.000084
0.0061
None
Lead
0.15
0.15
Residential
29/56
0.000088
0.0011
None
Cove Day School
27/56
0.000105
0.0017
None
Cove Water Tower
26/56
0.000094
0.0039
None
Cove Chapter House
27/56
0.00009
0.00062
None
NTUA Pump Station
28/56
0.00012
0.0016
None
Field Blank
8/56
0.000088
0.0016
None
Molybdenum
0.209
0.209
Residential
6/56
0.000086
0.00036
None
Cove Day School
7/56
0.000084
0.00015
None
Cove Water Tower
2/56
0.00015
0.00019
None
Cove Chapter House
0/56
--
--
None
NTUA Pump Station
2/56
0.00022
0.00048
None
Field Blank
0/56
-
-
None
Page 1 of 2
-------
Table 8. Summary Statistics - Metals and PM2.5, by Analyte and Station (Continued)
Analyte
Project Action Limit
(MQ/m3)
Location
Detection
Frequency
Minimum
Concentration
(MQ/m3)
Maximum
Concentration
(MQ/m3)
Exceedances
QAPP PAL
Alternate PAL
Selenium
2.09
2.09
Residential
0/56
--
--
None
Cove Day School
1 / 56
0.0005
0.0005
None
Cove Water Tower
0/56
--
--
None
Cove Chapter House
0/56
--
--
None
NTUA Pump Station
0/56
--
--
None
Field Blank
1 / 56
0.0005
0.0005
None
Uranium
0.00417
0.00417
Residential
2/56
0.000084
0.000086
None
Cove Day School
0/56
--
--
None
Cove Water Tower
0/56
--
--
None
Cove Chapter House
0/56
--
--
None
NTUA Pump Station
0/56
--
--
None
Field Blank
0/56
-
-
None
Vanadium
0.0104
0.0104
Residential
14/56
0.000096
0.00039
None
Cove Day School
13/56
0.000093
0.00039
None
Cove Water Tower
11/56
0.0001
0.00027
None
Cove Chapter House
10/56
0.000099
0.00028
None
NTUA Pump Station
14/56
0.000087
0.00033
None
Field Blank
3/56
0.000094
0.00049
None
PM2.5
35
35
Residential
56/56
0.167
12.41
None
Cove Day School
52/56
0.042
12.74
None
Cove Water Tower
51 / 56
0.0416
10.45
None
Cove Chapter House
45/56
0.25
12.495
None
NTUA Pump Station
49/56
0.083
20.6
None
Field Blank
5/56
0.0417
0.333
None
Notes:
PALs are per the QAPP and are based on USEPA regional screening levels for a target cancer risk of 3E-04 and a target noncancer hazard quotient of 0.1.
Alternate PALs are based on USEPA regional screening levels for a target cancer risk of 1E-04 and a target noncancer hazard quotient of 0.1. The PM2.5 PAL is
from the National Ambient Air Quality Standard for PM2.5.
|jg/m3 Microgram per cubic meter PM2.5 Particulate matter less than 2.5 micrometers in diameter
NTUA Navajo Tribal Utility Authority QAPP Quality assurance project plan
PAL Project action limit USEPA U.S. Environmental Protection Agency
Page 2 of 2
-------
Table 9. Metal and PM2.5 Field Blank Detections Above the Reporting Limit
Analyte
Sampling Week
Detected Concentration
(Mg/m3)
Reporting Limit
(M9/m3)
Barium
11
1.60E-03
8.30E-04
14
4.10E-03
8.30E-04
39
1.00E-03
8.30E-04
50
1.20E-03
8.30E-04
53
6.10E-03
8.30E-04
PM2.5
8
0.333
0.0417
20
0.210
0.0417
29
0.208
0.0417
Notes:
|jg/m3 Microgram per cubic meter
PM2.5 Particulate matter less than 2.5 micrometers in diameter
Page 1 of 1
-------
Table 10. Metal and PM2.5 Field Duplicate Result Summary
Analyte
Sampling
Week
Location
Original
Concentration
(Mg/m3)
Field Duplicate
Concentration
(M9/m3)
Relative
Percent
Difference
Arsenic
2
Chapter House
0.0001
0.000083
19%
57
NTUA Pump House
0.00017
0.00017
0%
2
Chapter House
0.00038
0.00045
17%
5
Chapter House
0.00011
0.000087
23%
8
Residence
0.00099
0.0011
11%
10
Residence
0.0011
0.0014
24%
16
Residence
0.0015
0.0014
7%
18
NTUA Pump House
0.0013
0.002
42%
20
NTUA Pump House
1.40E-03
2.10E-03
40%
22
NTUA Pump House
8.80E-04
7.60E-04
15%
24
NTUA Pump House
8.20E-04
2.90E-03
112%
Barium
26
NTUA Pump House
8.40E-04
1.60E-03
62%
34
Cove Day School
3.50E-04
1.70E-04
69%
36
Cove Day School
5.20E-04
2.60E-04
67%
38
Cove Day School
3.00E-04
1.80E-04
50%
44
Water Tower
4.20E-04
4.30E-04
2%
45
Water Tower
1.80E-03
1.30E-03
32%
49
Cove Day School
2.00E-03
2.30E-03
14%
51
Cove Day School
7.60E-04
9.00E-04
17%
53
NTUA Pump House
6.10E-03
7.90E-03
26%
55
NTUA Pump House
8.20E-04
1.10E-03
29%
57
NTUA Pump House
2.20E-03
2.10E-03
5%
2
Chapter House
0.00032
0.00034
6%
18
NTUA Pump House
0.000099
0.00017
53%
24
NTUA Pump House
0.00025
0.00044
55%
28
Cove Day School
0.0001
0.00011
10%
30
Cove Day School
0.00011
0.00015
31%
Lead
32
Cove Day School
0.00015
0.00015
0%
34
Cove Day School
0.00019
0.00019
0%
36
Cove Day School
0.00017
0.00016
6%
42
Water Tower
0.00017
0.0001
52%
44
Water Tower
0.00029
0.00064
75%
49
Cove Day School
0.00042
0.00047
11%
1
Chapter House
0.417
0.416
0%
2
Chapter House
0.541
0.208
89%
5
Chapter House
0.583
0.333
55%
PM2.5
8
Residence
3.87
5.12
28%
10
Residence
2.58
6.12
81%
12
Residence
1
2.46
84%
14
Residence
2.25
4.12
59%
Page 1 of 2
-------
Table 10. Metal and PM2.5 Field Duplicate Result Summary (Continued)
Analyte
Sampling
Week
Location
Original
Concentration
(pCi/m3)
Field Duplicate
Concentration
(pCi/m3)
Relative
Percent
Difference
16
Residence
4.75
4.75
0%
18
NTUA Pump House
5.04
6.37
23%
20
NTUA Pump House
10.24
10.65
4%
22
NTUA Pump House
11.95
12.15
2%
24
NTUA Pump House
8.16
11.86
37%
26
NTUA Pump House
1.998
2.247
12%
28
Cove Day School
0.541
0.375
36%
PM2.5
(continued)
34
Cove Day School
0.666
0.666
0%
36
Cove Day School
0.916
0.583
44%
40
Water Tower
0.125
0.042
99%
44
Water Tower
0.749
1.249
50%
45
Water Tower
3.707
3.374
9%
49
Cove Day School
5.745
6.122
6%
51
Cove Day School
3.747
3.164
17%
53
NTUA Pump House
18.326
18.394
0%
55
NTUA Pump House
2.79
2.83
1%
57
NTUA Pump House
9.12
9.41
3%
Vanadium
49
Cove Day School
0.0002
0.00027
30%
57
NTUA Pump House
0.00031
0.00027
14%
Notes:
|jg/m3 Microgram per cubic meter
NTUA Navajo Tribal Utility Authority
PM2.5 Particulate matter less than 2.5 micrometers in diameter
Page 2 of 2
-------
Table 11. Meteorological Summary for Radionuclide Sampling Events
Event
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Average Wind Direction
(degrees)
Scalar
Average
Vector
Average
Scalar
Average
Vector
Average
1
2/13/2020
Full dataset not collected
2
2/20/2020
Full dataset not collected
3
2/27/2020
Full dataset not collected
4
3/3/2020
Full dataset not collected
5
3/10/2020
7.9
68.2
0.5
26,045
2.1
1.8
193
195
6
3/17/2020
6.0
56.2
0.5
30,124
2.9
2.6
231
230
7
3/24/2020
7.0
40.1
0.0
38,594
3.6
3.4
238
237
8
5/11/2021
18.3
13.6
0.0
56,169
2.9
2.5
241
239
9
5/18/2021
17.2
22.0
0.0
53,141
4.4
4.1
225
227
10
5/25/2021
20.8
13.4
0.0
53,708
2.6
2.2
218
220
11
6/2/2021
24.9
17.5
0.0
47,548
2.9
2.5
226
217
12
6/8/2021
25.5
7.2
0.0
62,873
2.7
2.4
214
214
13
6/15/2021
29.5
15.3
0.0
56,147
2.3
1.9
197
198
14
6/22/2021
22.0
35.9
0.2
48,169
2.8
2.5
212
213
15
6/29/2021
24.9
37.1
0.1
49,673
2.6
2.3
179
178
16
7/6/2021
28.3
22.3
0.0
55,615
2.2
1.8
194
186
17
7/13/2021
25.9
34.8
0.0
46,542
2.3
1.9
195
194
18
7/20/2021
23.3
53.3
0.4
40,226
2.2
1.9
207
206
19
7/27/2021
23.0
52.9
0.6
42,910
1.8
1.5
194
194
20
8/3/2021
25.7
21.4
0.0
54,588
2.5
2.2
250
256
21
8/10/2021
25.2
33.5
0.0
43,703
2.5
2.1
192
189
22
8/17/2021
22.0
44.3
0.5
46,472
2.7
2.4
212
211
23
8/24/2021
25.1
25.4
0.0
48,484
2.2
1.9
191
189
24
8/31/2021
21.0
48.2
1.1
37,731
1.8
1.5
218
216
25
9/7/2021
25.1
23.3
0.0
44,208
2.1
1.8
216
216
26
9/14/2021
21.4
29.5
0.2
43,803
2.6
2.3
243
242
Page 1 of 3
-------
Table 11. Meteorological Summary for Radionuclide Sampling Events (Continued)
Event
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Average Wind Direction
(degrees)
Scalar
Average
Vector
Average
Scalar
Average
Vector
Average
27
9/21/2021
17.6
35.5
0.2
36,003
1.7
1.4
205
202
28
9/28/2021
12.9
68.8
1.0
27,455
1.6
1.4
199
200
29
10/5/2021
13.6
52.5
0.3
31,240
2.6
2.4
229
229
30
10/12/2021
7.3
49.7
0.0
33,457
2.3
2.1
225
229
31
10/19/2021
11.5
38.4
0.0
30,393
2.3
2.1
214
213
32
10/26/2021
9.3
47.4
0.0
28,227
2.2
2.0
238
238
33
11/2/2021
11.2
37.0
0.0
28,543
1.9
1.7
222
221
34
11/9/2021
9.2
40.3
0.0
24,995
2.0
1.8
243
242
35
11/16/2021
5.7
35.0
0.0
22,276
1.7
1.5
224
224
36
11/23/2021
3.4
47.3
0.0
21,545
1.7
1.5
217
221
37
11/30/2021
6.1
37.0
0.0
22,454
1.6
1.4
221
221
38
12/7/2021
1.0
66.2
1.1
16,386
2.5
2.3
214
212
39
12/14/2021
-2.5
65.5
0.1
20,017
2.0
1.8
207
208
40
12/21/2021
3.6
61.3
1.1
11,582
3.8
3.5
221
222
41
12/28/2021
-2.4
67.1
0.3
19,956
3.3
3.1
232
231
42
1/4/2022
3.2
57.4
0.0
21,673
2.0
1.7
199
199
43
1/11/2022
1.2
51.2
0.0
23,488
1.5
1.3
217
218
44
1/18/2022
1.3
52.3
0.0
23,710
1.9
1.7
230
230
45
3/22/2022
12.2
22.9
0.0
43,435
2.9
2.6
241
240
46
3/29/2022
9.7
53.2
0.5
42,936
2.6
2.3
254
252
47
4/5/2022
11.4
20.8
0.0
49,093
3.6
3.3
258
257
48
4/12/2022
10.5
22.4
0.1
48,341
3.3
3.0
243
245
49
4/19/2022
12.6
25.6
0.0
50,158
4.2
3.9
234
233
50
4/26/2022
15.3
18.8
0.0
56,195
3.7
3.4
245
245
51
5/3/2022
16.7
20.6
0.0
56,083
5.1
4.8
243
242
52
5/10/2022
17.5
14.6
0.0
57,750
3.0
2.7
227
229
Page 2 of 3
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Table 11. Meteorological Summary for Radionuclide Sampling Events (Continued)
Event
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Average Wind Direction
(degrees)
Scalar
Average
Vector
Average
Scalar
Average
Vector
Average
53
5/17/2022
19.1
19.5
0.0
53,118
3.6
3.3
255
255
54
5/24/2022
19.3
17.3
0.0
57,112
3.7
3.3
250
250
55
5/31/2022
21.6
15.9
0.0
59,213
2.9
2.5
226
224
56
6/7/2022
27.6
14.6
0.0
59,696
3.5
3.1
238
239
57
6/14/2022
22.6
27.1
0.3
51,889
2.6
2.2
213
209
Notes:
Meteorological data collection began halfway through Event 4.
Although no radionuclide samples were collected during Event 20, meteorological data are presented for informational purposes.
°C Degree Celsius
m/s Meter per second
W/m2 Weber per square meter
Page 3 of 3
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Table 12. Meteorological Summary for Metal and PM2.5 Sampling Events
Event
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Average Wind Direction
(degrees)
Scalar
Average
Vector
Average
Scalar
Average
Vector
Average
1
2/13/2020
Full dataset not collected
2
2/20/2020
Full dataset not collected
3
2/27/2020
Full dataset not collected
4
3/3/2020
Full dataset not collected
5
3/13/2020
7.3
71.0
0.3
4,681
4.0
3.7
219
218
6
3/19/2020
2.2
81.7
0.3
3,689
4.1
3.9
238
234
7
3/26/2020
11.2
28.5
0.0
6,468
5.6
5.3
232
231
8
5/14/2021
21.5
9.9
0.0
8,978
2.8
2.4
242
240
9
5/21/2021
17.6
31.6
0.0
7,016
8.2
7.9
213
213
10
5/28/2021
20.5
14.0
0.0
9,010
2.0
1.7
208
206
11
6/4/2021
24.7
24.6
0.0
8,619
2.1
1.6
165
162
12
6/11/2021
23.9
8.3
0.0
9,521
2.2
1.8
212
211
13
6/18/2021
27.5
19.2
0.0
7,892
1.8
1.4
180
178
14
6/25/2021
20.9
35.8
0.2
5,307
2.6
2.2
246
245
15
7/2/2021
26.3
28.7
0.0
7,228
2.2
1.8
169
167
16
7/9/2021
29.0
19.7
0.0
7,720
1.9
1.5
221
205
17
7/16/2021
27.0
28.2
0.0
6,807
2.5
2.2
212
211
18
7/23/2021
23.8
53.4
0.1
6,258
3.0
2.6
262
260
19
7/30/2021
22.7
51.5
0.0
6,191
2.0
1.7
203
188
20
8/6/2021
27.2
21.7
0.0
7,722
3.5
3.2
250
249
21
8/13/2021
25.9
30.7
0.0
7,408
2.6
2.2
126
125
22
8/20/2021
18.4
55.0
0.1
7,348
1.7
1.4
196
187
23
8/27/2021
24.7
34.6
0.0
7,062
2.0
1.7
169
169
24
9/3/2021
19.7
59.5
0.0
6,101
1.2
1.0
204
198
25
9/10/2021
26.7
21.8
0.0
6,724
2.5
2.1
217
216
26
9/17/2021
22.7
18.4
0.0
6,813
2.4
2.2
255
255
Page 1 of 3
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27
28
29
30
31
32
33
34
35
36
37
38
39
40
41_
42
43
44
45
46
47
48
49
50
51
52
Table 12. Meteorological Summary for Metal and PM2.5 Sampling Events (Continued)
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Scalar
Average
Vector
Average
Average Wind Direction
(degrees)
Scalar
Average
9/24/2021
20.3
24.6
0.0
6,246
1.9
1.6
171
10/1/2021
10.3
79.5
0.1
4,738
1.4
1.3
136
10/8/2021
16.9
44.0
0.0
2,839
2.8
2.6
235
10/15/2021
5.0
42.8
0.0
5,468
1.6
1.4
266
10/22/2021
9.5
38.4
0.0
4,841
1.2
1.0
194
10/29/2021
8.6
54.9
0.0
4,587
1.1
1.0
186
11/5/2021
8.6
43.2
0.0
4,336
1.3
1.1
190
11/12/2021
8.6
43.0
0.0
4,038
2.3
2.1
260
11/19/2021
4.8
38.0
0.0
2,904
1.3
1.0
215
11/26/2021
-0.2
47.5
0.0
3,539
1.1
0.9
192
12/3/2021
5.1
42.8
0.0
3,337
1.3
1.2
225
12/10/2021
-0.1
70.2
0.5
1,728
4.2
4.0
264
12/17/2021
-1.4
60.6
0.0
3,316
1.8
1.7
253
12/24/2021
4.9
78.4
1.1
587
5.4
5.1
228
12/31/2021
2.7
72.0
0.1
2,128
4.6
4.3
236
1/7/2022
5.6
60.9
0.0
3,365
1.6
1.2
214
1/14/2022
3.6
51.8
0.0
3,627
2.2
1.9
262
1/21/2022
-1.5
50.1
0.0
2,804
1.2
1.1
182
3/25/2022
12.5
29.8
0.0
6,955
1.6
1.3
253
4/1/2022
8.3
62.6
0.2
7,338
2.2
1.8
273
4/8/2022
10.9
22.4
0.0
7,826
2.0
1.7
231
4/15/2022
13.1
19.2
0.0
8,041
4.0
3.7
242
4/22/2022
13.4
25.4
0.0
3,964
7.8
7.5
225
4/29/2022
14.0
17.3
0.0
8,754
4.8
4.5
262
5/6/2022
19.9
14.9
0.0
8,412
3.2
3.0
249
5/13/2022
13.6
17.1
0.0
9,174
2.1
1.8
275
Page 2 of 3
-------
Table 12. Meteorological Summary for Metal and PM2.5 Sampling Events (Continued)
Event
Start Date
Average
Temperature
(°C)
Average
Relative
Humidity
(Percent)
Total
Rainfall
(inches)
Total Solar
Radiation
(W/m2)
Average Wind Speed (m/s)
Average Wind Direction
(degrees)
Scalar
Average
Vector
Average
Scalar
Average
Vector
Average
53
5/20/2022
17.9
19.9
0.0
9,001
6.3
5.9
257
257
54
5/27/2022
24.2
13.0
0.0
9,124
3.5
3.2
244
243
55
6/3/2022
23.1
10.3
0.0
8,196
3.3
3.0
244
242
56
6/10/2022
28.4
12.9
0.0
9,257
2.6
2.3
264
263
57
6/17/2022
26.4
19.0
0.0
5,378
3.2
2.7
205
202
Notes:
Meteorological data collection began halfway through Event 4.
Although no metals and PM2.5 samples were collected during Event 7, meteorological data are presented for informational purposes.
°C Degree Celsius
m/s Meter per second
PM2.5 Particulate matter less than 2.5 micrometers in diameter
W/m2 Weber per square meter
Page 3 of 3
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Table 13. Seasonal and Monthly Coverage Summary
Season 1
Samples Collected 2
Month 1,3
Samples Collected 2
Radionuclides
Metals
Radionuclides
Metals
December
10
20
Winter
32
40
January
0
12
February
12
12
March
20
16
Spring
73
76
April
20
20
May
28
28
June
25
28
Summer
21
52
July
5
20
August
4
16
September
12
16
Fall
30
56
October
18
20
November
2
16
Total
156
224
Total
156
224
Notes:
Events that cross months or seasons are assigned to the month or season having the most days in that month or season.
Only field samples from the four Cove stations are included. Field quality control and reference station samples are not counted.
Months are arbitrarily separated into seasons based more on climatic conditions than typical calendar associations.
Page 1 of 1
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