Clean Air Status and Trends Network
Second Quarter 2021 Quality Assurance Report
Summary of Quarterly Operations (April through June)
EPA Contract No. 68HERH21D0006
Introduction
This quarterly report summarizes results from the Clean Air Status and Trends Network (CASTNET)
quality assurance/quality control (QA/QC) program for data collected during second quarter 2021. The
various QA/QC criteria and policies are documented in the CASTNET Quality Assurance Project Plan
(QAPP; Wood, 2021). The QAPP is comprehensive and includes standards and policies for all
components of project operation from site selection through final data reporting. It is reviewed
annually and updated as warranted.
Quarterly Summary
Wood continued working with the American Association for Laboratory Accreditation (A2LA) assessor
in preparation for the biannual review required to maintain International Organization for
Standardization (ISO)/International Electrotechnical Commission (IEC) 17025:2017 accreditation, which
took place April 12-14, 2021. The assessment was virtual. The assessment went smoothly as the
assessor had requested advance, electronic copies of general documentation along with many
laboratory and field-related records. There were four findings that required corrective action. Wood
addressed the corrective actions. Certified, adjustable pipettes with appropriate certification
documentation were ordered. Documentation and other issues were addressed, and the appropriate
updates/additions were prepared and provided to A2LA. Wood's ISO/IEC 17025:2017 re-accreditation
was approved by A2LA will continue through May 2023.
Wood's field and QA personnel began preparing training materials and checklists for calibrators to
help them recognize when local conditions (e.g., size and proximity of vegetation) have potential to
violate established siting criteria during site visits.
Wood incorporated comments received from reviewers of the Draft Final CASTNET Quality Assurance
Project Plan (QAPP) Revision 9.4. Additionally, Wood received approval from EPA to modify
statements on double entry to indicate that only items that directly affect atmospheric concentration
data (e.g., dates) from the Site Status Report Forms (SSRF) require double entry. With this change, only
two fields on the SSRF will require double entry. Wood's QA Manager then worked with the EPA
Project Officer and EPA QA Officer on additional details, and the final version of the QAPP was
approved by EPA in June 2021.
Wood received the final results for proficiency test study 0117 for Rain and Soft Waters from the
National Laboratory of Environmental Testing, a branch of the National Water Research Institute with
ECCC that provides quality assurance services. Sodium was flagged high but within limits. No
corrective actions were required.
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The CASTNET QA Manager prepared the annual management review summary presentation as
required to maintain ISO/IEC 17025:2017 accreditation by the A2LA. During third quarter, the
presentation will be distributed to the CASTNET management team, and the annual management
review meeting will be held to discuss the presentation.
The potassium carbonate used to impregnate the cellulose filters is currently backordered by J.T.
Baker, Wood's usual supplier, until January 2022. Wood has a supply sufficient only through August
2021. Wood began acceptance testing potassium carbonate from four other suppliers. Potassium
carbonate that passed acceptance testing was then scheduled for field testing at the Gainesville test
site. Wood will select a new potassium carbonate supplier based on a product that passes acceptance
testing and field testing with performance that most closely compares with J.T. Baker's potassium
carbonate. Additionally, Wood will verify that the supplier has a sufficient quantity to ensure
availability.
Table 1 lists the quarters of data that were validated to Level 3 during second quarter 2021 by site
calibration group. Table 2 lists the sites in each calibration group along with the calibration schedule.
Table 3 presents the measurement criteria for laboratory filter pack measurements. These criteria
apply to the QC samples listed in the following section of this report. Table 4 presents the critical
criteria for ozone monitoring. Table 5 presents the critical criteria for trace-level gas monitoring.
Quality Control Analysis Count
The QC sample statistics presented in this report are for reference standards (RF) and continuing
calibration verification spikes (CCV) used to assess accuracy and for replicate sample analyses (RP)
used to assess "in-run" precision. In addition, laboratory method blanks (MB) containing reagents
without a filter; laboratory blanks (LB) containing reagents and a new, unexposed filter; and field
blanks (FB) containing reagents and an unexposed filter that was loaded into a filter pack assembly
and shipped to and from the monitoring site while remaining in sealed packaging are also included.
Table 6 presents the number of analyses in each category that were performed during second quarter
2021.
Sample Receipt Statistics
Ninety-five percent of field samples from EPA-sponsored sites must be received by the CASTNET
laboratory in Gainesville, FL no later than 14 days after removal from the sampling tower. Table 7
presents the relevant sample receipt statistics for second quarter 2021. Beginning in early 2020,
deliveries of filter packs to the analytical laboratory have been frequently delayed in transit. For
example, in second quarter 2019, the average interval in days to delivery was 5.487 days. In second
quarter 2020, the average interval in days was 7.285 days. In second quarter 2021, the average interval
was 8.382 days. During review of first quarter 2021 filter pack concentrations (see the CASTNET
Quarterly Data Summary for First Quarter 2021; Wood, 2021), it was noted that one of the Mackville, KY
co-located filter packs for the week of 2/9/21 was not delivered to the analytical laboratory on time.
The MCK131 filter pack was delayed in the postal system for three weeks. Comparison of MCK131
concentrations with concentrations from the co-located MCK231 site showed that the delay allowed
particulate N03 to volatize resulting in higher HN03 concentrations.
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Data Quality Indicator (DQI) Results
Figures 1 through 3 present the results of RF, CCV, and RP QC sample analyses for second quarter
2021. All results were within the criteria listed in Table 3.
Table 8 presents summary statistics of critical criteria measurements at ozone sites collected during
second quarter 2021. The statistics presented contain data validated at Level 2 and Level 3. All data
associated with QC checks that fail to meet the criteria listed in Table 4 were or will be invalidated
unless the cause of failure has no effect on ambient data collection, and passing results still meet
frequency criteria. During second quarter, no values exceeded documented criteria or were
otherwise notable.
Table 9 presents summary statistics of critical criteria measurements at trace-level gas monitoring sites
collected during second quarter 2021. The statistics presented contain data validated at Level 2 and
Level 3. All data associated with QC checks that fail to meet the criteria listed in Table 5 were or will be
invalidated unless the cause of failure has no effect on ambient data collection, and passing results
still meet frequency criteria. Results in shaded cells either exceed documented criteria or are otherwise
notable. Table 10 presents observations associated with the shaded cell results in Table 9.
Laboratory Control Sample Analysis
The laboratory control sample (LCS) is a reagent blank spiked with the target analytes from the
established analytical methods and carried through the same extraction process that field samples
must undergo. The LCS is not required by the CASTNET QA/QC program. LCS analyses are performed
by the laboratory to monitor for potential sample handling artifacts and provide a means to identify
possible analyte loss from extraction to extraction. Figure 4 presents LCS analysis results for second
quarter 2021. All recovery values were between 85 percent and 102 percent with the exception of one
recovery at 36 percent. All other QC in the batch with the low LCS were within criteria, and the sample
data are reasonable compared with other sampling weeks. An error in spiking the sample is suspected.
Corrective action has been initiated to prevent recurrence.
Blank Results
Figures 5 through 7 present the results of MB, LB, and FB QC sample analyses for second quarter 2021.
All second quarter results were within criteria (two times the reporting limit) listed in Table 3. Several
FB showed higher than usual results in late June. The LB and MB associated with these FB were below
the reporting limit. The higher FB results correlate with a freshly made eluent solution. The laboratory
is investigating to ensure there is no quality issue.
Suspect/Invalid Filter Pack Samples
Filter pack samples that were flagged as suspect or invalid during second quarter 2021 are listed in
Table 11. This table also includes associated site identification and a brief description of the reason the
sample was flagged. During second quarter, 10 filter pack samples were invalidated.
Field Problem Count
Table 12 presents counts of field problems affecting continuous data collection for more than one day
for second quarter 2021. The problem counts are sorted by a 30-, 60-, or 90-day time period to
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resolution. A category for unresolved problems is also included. Time to resolution indicates the
period taken to implement corrective action.
References
American Society for Testing and Materials (ASTM). 2008. ASTM E29-08, "Standard Practice for Using
Significant Digits in Test Data to Determine Conformance with Specifications." ASTM
International, West Conshohocken, PA, D01:10.1520/E0029-08. www.astm.org.
U.S. Environmental Protection Agency (EPA). 2020. Title 40 Code of Federal Regulations Part 58,
"Appendix A to Part 58 - Quality Assurance Requirements for Monitors used in Evaluations of
National Ambient Air Quality Standards."
Wood Environment & Infrastructure Solutions, Inc. (Wood). 2021. Clean Air Status and Trends
Network (CASTNET) Quarterly Data Summary for First Quarter 2021. Prepared for U.S.
Environmental Protection Agency (EPA), Office of Air and Radiation, Clean Air Markets Division,
Washington, DC. Contract No. EP-W-16-015. Gainesville, FL.
Wood Environment & Infrastructure Solutions, Inc. (Wood). 2021. Clean Air Status and Trends
Network (CASTNET) Quality Assurance Project Plan (QAPP) Revision 9.4. Prepared for U.S.
Environmental Protection Agency (EPA), Office of Air and Radiation, Clean Air Markets Division,
Washington, DC. Contract No. EP-W-16-015. Gainesville, FL.
https://java.epa.gov/castnet/documents.do.
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Table 1 Data Validated to Level 3 during Second Quarter 2021
Calibration
Group*
Months
Available
Number of
Months
Complete
Quarters
Number of
Quarters
E-l/SE-5
August 2020 -
January 2021
6
Quarter 4 2020
1
MW-7/W-9
September 2020 -
February 2021
6
Quarter 4 2020
1
E-2/MW-8
October 2020 -
March 2021
6
Quarter 4 2020 -
Quarter 1 2021
2
Note: * The sites contained in each calibration group are listed in Table 2.
Table 2 Field Calibration Schedule for 2021
Calibration
Group
Months
Calibrated
Sites
Calibrated
Eastern Sites (22 Total)
E-l
(8 Sites)
February/August
BEL116, MD WSP144, NJ ARE128, PA PED108,VA
BWR139, MD CTH110, NY PSU106, PA VPU20, VA
E-2
(9 Sites)
April/October
ABT147, CT WST109, NH HWF187, NY1 WFM105, NY UND002, VT
ASH135, ME CAT175, NY NIC001, NY EGB181, ON
E-3
(5 Sites)
May/November
KEF112, PA LRL117, PA CDR119, WV
MKG113, PA PAR107, WV
Southeastern Sites (11 Total)
SE-4
(7 Sites)
January/July
SND152, AL BFT142, NC COW137, NC SPD111, TN
GAS 153, GA CND125, NC DUK008, NC1
SE-5
(4 Sites)
February/August
CAD150, AR SUM156, FL
IRL141, FL CVL151, MS
Midwestern Sites (19 Total)
MW-6
(6 Sites)
January/July
CDZ171, KY MCK131, KY PNF126, NC1
CKT136, KY MCK231, KY ESP127, TN
MW-7
(9 Sites)
March/September
ALH157, IL STK138, IL RED004, MN OXF122, OH PRK134, WI
BVL130, IL2 VIN140, IN DCP114, OH QAK172, OH
MW-8
(4 Sites)
April/October
SAL133, IN ANA115, MI
HOX148, MI UVL124, MI
Western Sites (12 Total)
W-9
(5 Sites)
March/September
KNZ184, KS CHE185, OK ALC188, TX
KIC003, KS SAN 189, NE
W-10
(7 Sites)
May/November
GTH161, CO NPT006, ID UMA009, WA PND165,WY3
ROM206, CO3 PAL190, TX CNT169, WY
Notes: 1 Trace-level gas calibrations are performed quarterly in January, April, July, and October.
2Trace-level gas calibrations are performed quarterly in March, June, September, and December.
3Trace-level gas calibrations are performed quarterly in February, May, August, and November.
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Table 3 Data Quality Indicators for CASTNET Laboratory Measurements
Analyte
Method
Precision1
(MARPD)
Accuracy2
(%)
Nominal
Reporting Limits
mg/L
fig/Filter
Ammonium (NH4+)
AC
20
90-110
0.020*
0.5
Sodium (Na+)
ICP-OES
20
95-105
0.005
0.125
Potassium (K+)
ICP-OES
20
95-105
0.006
0.15
Magnesium (Mg2+)
ICP-OES
20
95-105
0.003
0.075
Calcium (Ca2+)
ICP-OES
20
95-105
0.006
0.15
Chloride (CI")
IC
20
95-105
0.020
0.5
Nitrate (NOs)
IC
20
95-105
0.008*
0.2
Sulfate (S024)
IC
20
95-105
0.040
1.0
Notes: 1 This column lists precision goals for both network precision calculated from co-located filter samples and laboratory precision
based on replicate samples for samples > five times the reporting limit. The criterion is ± the reporting limit if the sample is < five
times the reporting limit.
2 This column lists laboratory accuracy goals based on reference standards and continuing calibration verification spikes. The criterion
is 90-110 percent for ICP-OES reference standards.
3 The reporting limit for sulfate on cellulose filters is 0.080 mg/L (2.0 |jg/filter).
AC = automated colorimetry
IC = ion chromatography
ICP-OES = inductively coupled plasma-optical emission spectrometry
MARPD = mean absolute relative percent difference
mg/L = milligrams per liter
Mg/Filter = micrograms per filter
* = as nitrogen
Values are rounded according to American Society for Testing and Materials (ASTM) E29-08, "Standard Practice for Using Significant
Digits in Test Data to Determine Conformance with Specifications" (ASTM, 2008).
For more information on analytical methods and associated precision and accuracy criteria, see the CASTNET QAPP, (Wood, 2021).
Table 4 Ozone Critical Criteria*
Type of Check
Analyzer Response
Zero
Less than + 3.1 parts per billion (ppb)
Span
Less than + 7.1 percent between supplied and observed concentrations
Single Point QC
Less than + 7.1 percent between supplied and observed concentrations
Notes: * Applies to CASTNET sites that are configured and operated in accordance with Part 58 of Title 40 of the Code of Federal
Regulations (EPA, 2020). The minimum frequency for these checks is once every two weeks.
Values are rounded according to ASTM E29-08, "Standard Practice for Using Significant Digits in Test Data to Determine Conformance
with Specifications" (ASTM, 2008).
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Table 5 Trace-level Gas Monitoring Critical Criteria*
Parameter
Analyzer Response
Zero Check
Span Check/ Single Point QC Check
S02
Less than + 1.51 ppb
Less than + 10.1 percent between supplied and observed
concentrations
NOy
Less than + 1.51 ppb
CO
Less than + 30.1 ppb
Notes: *Applies to CASTNET sites that are configured and operated in accordance with Part 58 of Title 40 of the Code of Federal Regulations
(EPA, 2020). The minimum frequency for these checks is once every two weeks.
Values are rounded according to ASTM E29-08, "Standard Practice for Using Significant Digits in Test Data to Determine
Conformance with Specifications" (ASTM, 2008).
SO2 = sulfur dioxide
NOy = total reactive oxides of nitrogen
CO = carbon monoxide
ppb = parts per billion
Table 6 QC Analysis Count for Second Quarter 2021
Filter
Type
Parameter
RF
Sample
Count
CCV
Sample
Count
RP
Sample
Count
MB
Sample
Count
LB
Sample
Count
FB
Sample
Count
Teflon
S024
75
211
83
18
24
97
NOj
75
211
83
18
24
97
NH+4
36
171
82
18
22
93
CI"
75
211
83
18
24
97
2+
Ca
36
188
82
18
22
93
r, a 2 +
Mg
36
188
82
18
22
93
Na+
36
188
82
18
22
93
K+
36
188
82
18
22
93
Nylon
S024
54
203
88
18
24
94
NOj
54
203
88
18
24
94
Cellulose
SO4
51
192
88
20
24
94
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Table 7 Filter Pack Receipt Summary for Second Quarter 2021
Count of samples received more than 14 days
after removal from tower:
73
Count of all samples received:
743
Fraction of samples received within 14 days:
0.902
Average interval in days:
8.382
First receipt date:
04/01/2021
Last receipt date:
06/24/2021
Note: Sample shipments for the Egbert, Ontario site (EGB181) are in groups of four.
Samples associated with EGB181 are excluded from this statistic.
Table 8 Ozone QC Summary for Second Quarter 2021 (1 of 2)
% Single Single Zero
% Span Point QC Point QC % Zero Average
Site ID Pass1 Span |%D|2 Pass1 |%D|2 Pass1 (ppb)2
ABT147, CT
100.00
0.39
100.00
0.45
100.00
0.22
ALC188, TX
100.00
3.83
100.00
2.68
100.00
0.45
ALH157, IL
100.00
1.01
100.00
1.47
100.00
0.15
ANA115, MI
100.00
1.99
100.00
1.49
100.00
0.14
ARE128, PA
100.00
1.45
100.00
1.56
100.00
0.31
ASH135, ME
100.00
0.87
100.00
0.88
100.00
0.17
BEL116, MD
100.00
1.66
100.00
1.14
100.00
0.48
BFT142, NC
100.00
1.18
100.00
1.02
100.00
0.65
BVL130, IL
100.00
1.51
100.00
1.44
100.00
0.24
BWR139, MD
100.00
1.09
100.00
1.52
100.00
0.45
CAD150, AR
100.00
0.87
100.00
1.39
100.00
0.31
CDR119, WV
100.00
2.25
100.00
1.90
100.00
0.19
CDZ171, KY
100.00
2.65
100.00
1.36
100.00
1.09
CKT136, KY
100.00
0.46
100.00
0.45
100.00
0.12
CND125, NC
100.00
1.38
100.00
1.13
100.00
0.66
CNT169, WY
100.00
0.58
100.00
0.64
100.00
0.31
COW137, NC
100.00
0.69
100.00
1.21
100.00
0.89
CTH110, NY
100.00
3.55
100.00
3.97
100.00
0.12
CVL151, MS
97.83
1.41
100.00
0.78
100.00
0.41
DCP114, OH
98.90
1.35
100.00
1.67
98.89
0.55
DUK008, NC
100.00
1.42
98.04
1.63
100.00
0.55
ESP127, TN
100.00
1.02
100.00
0.59
100.00
0.27
GAS153, GA
100.00
3.07
90.38
5.58
100.00
1.62
GTH161, CO
100.00
1.21
100.00
1.48
100.00
0.17
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Table 8 Ozone QC Summary for Second Quarter 2021 (2 of 2)
% Single Single Zero
% Span Point QC Point QC % Zero Average
Site ID Pass1 Span |%D|2 Pass1 |%D|2 Pass1 (ppb)2
HOX148, MI
100.00
1.26
100.00
1.19
100.00
0.18
HWF187, NY
100.00
2.27
100.00
1.76
100.00
0.29
IRL141, FL
100.00
1.83
100.00
2.20
100.00
0.57
KEF112, PA
100.00
0.96
100.00
0.80
100.00
0.16
LRL117, PA
100.00
0.88
100.00
0.78
100.00
0.19
MCK131, KY
98.92
1.70
100.00
1.57
100.00
0.21
MCK231, KY
100.00
0.51
100.00
0.51
100.00
0.15
MKG113, PA
100.00
2.85
100.00
2.41
100.00
0.35
NPT006, ID
98.92
1.49
100.00
1.74
100.00
0.18
OXF122, OH
100.00
2.23
100.00
1.86
100.00
0.24
PAL190, TX
100.00
1.26
100.00
1.53
100.00
0.44
PAR107, WV
100.00
0.99
100.00
1.22
100.00
0.21
PED108, VA
100.00
1.35
100.00
1.87
100.00
0.29
PND165, WY
100.00
0.81
100.00
0.90
100.00
0.20
PNF126, NC
100.00
0.41
100.00
0.86
100.00
0.44
PRK134, WI
100.00
1.06
100.00
1.02
100.00
0.21
PS U106, PA
100.00
3.29
100.00
3.27
100.00
0.18
QAK172, OH
100.00
2.34
98.92
3.99
100.00
1.17
ROM206, CO
100.00
1.52
100.00
1.79
100.00
0.42
SAL133, IN
100.00
0.40
100.00
0.38
100.00
0.25
SAN189, NE
100.00
2.01
100.00
2.07
100.00
0.71
SND152, AL
100.00
0.80
100.00
0.74
100.00
0.36
SPD111, TN
100.00
0.78
100.00
0.95
100.00
0.32
STK138, IL
100.00
1.62
100.00
1.37
100.00
0.39
SUM156, FL
100.00
2.73
100.00
2.05
100.00
0.24
UVL124, MI
100.00
0.73
100.00
0.91
100.00
0.44
VIN140, IN
98.94
4.56
96.81
3.84
100.00
0.62
VPI120, VA
94.06
5.11
98.02
4.07
100.00
0.21
WSP144, NJ
95.88
1.85
96.88
1.84
98.96
0.54
WST109, NH
100.00
0.85
100.00
0.87
100.00
0.18
Notes: Percentage of comparisons that pass the criteria listed in Table 4.
2Absolute value of the average percent differences between the on-site transfer standard and the site monitor.
%D = percent difference
ppb = parts per billion
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Table 9 Trace-level Gas QC Summary for Second Quarter 2021
Parameter
% Span
Pass1
Span |%D|2
% Single
Point QC
Pass1
Single Point
QC |%D|2
% Zero
Pass1
Zero
Average
(ppb)2
BVL130, IL
S02
100.00
2.25
100.00
6.15
96.55
0.69
NOy
100.00
1.42
100.00
2.63
100.00
0.79
CO
98.18
2.49
45.45
18.58
51.79
44.58
DUK008, NC
NOy
NA
NA
NA
NA
NA
NA
HWF187, NY
NOy
100.00
0.71
100.00
1.28
97.83
0.55
PND165, WY
NOy
97.73
4.56
77.27
5.52
100.00
0.68
PNF126, NC
NOy
98.04
2.93
96.00
5.55
96.08
0.39
ROM206, CO
NOy
100.00
0.70
100.00
2.66
100.00
0.26
Notes: Percentage of comparisons that pass the criteria listed in Table 5. Values falling below 90 percent are addressed in Table 10.
2Absolute value of the average percent differences between the supplied and observed concentrations. Values exceeding the criteria
listed in Table 5 are addressed in Table 10.
%D = percent difference
ppb = parts per billion
Table 10 Trace-level Gas QC Observations for Second Quarter 2021
Site ID
Parameter
QC Criterion
Comments
BVL130, IL
CO
% Single Point QC Pass
The CO analyzer required calibration in April and
Single Point QC |%D|
May.
% Zero Pass
Zero Average
PND165, WY
NOy
% Single Point QC Pass
The analyzer required calibration in May.
Notes: %D = percent difference
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Table 11 Filter Packs Flagged as Suspect or Invalid during Second Quarter 2021
Site ID
Sample No.
Reason
ALC188, TX
2121004-01
Power failures affected two weeks of sampling.
BBE401, TX
2118003-02
Insufficient flow volume was caused by a flow
system leak.
BUF603, WY
2121005-02
The data logger malfunctioned.
CDR119, WV
2119001-12
A power failure affected one week of sampling.
CHE185, OK
2117004-02
The sample was invalidated for suspect data.
FOR605, WY
2118005-03
A polling issue caused missing data. Data may be
recovered during review and validation.
JOT403, CA
2118003-12
A polling issue caused missing data. Data may be
recovered during review and validation.
LRL117, PA
2115001-31
The sample was invalidated for suspect data.
PIN414, CA
2118003-17
Insufficient flow volume was caused by a flow
system leak.
PND165, WY
2120001-40
The data logger malfunctioned.
Table 12 Field Problems Affecting Data Collection
Days to Resolution Problem Count
30
401
60
8
90
2
Unresolved by End of Quarter
39
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 1 Reference Standard Results for Second Quarter 2021 (percent recovery)
RF - Teflon ICP-OES
Ca S Mg • Na i, K
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6/19/2021
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1
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 2 Continuing Calibration Spike Results for Second Quarter 2021 (percent recovery)
CCV-Teflon ICP-OES
Ca ¦ Mg» NaA K
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I
- tUTU021
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 3 Replicate Sample Analysis Results for Second Quarter 2021 (percent difference)
RP - Teflon ICP-OES
Ca ¦ Mg» NaA K
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Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 4 Laboratory Control Sample Results for Second Quarter 2021 (percent recovery)
LCS-Teflon ICP-OES
Ca ¦ Mg» NaA K
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120
LCS - Cellulose IC
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Analysis Date
- 6/7/2021
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 5 Method Blank Analysis Results for Second Quarter 2021 (total micrograms)
0.16
MB - Teflon ICP-OES
Ca ¦ Ug» NaA K
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Analysis Date
i
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 6 Laboratory Blank Analysis Results for Second Quarter 2021 (total micrograms)
LB-Teflon ICP-OES
Ca ¦ Mg» NaA K
0.18
0.16
0.14
0.12
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4/12/2021
4/24/2021
Analysis Dale
1
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i
I
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
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EPA Contract No. 68HERH21D0006
CASTNET Quality Assurance Report - Second Quarter 2021
Figure 7 Field Blank Analysis Results for Second Quarter 2021 (total micrograms)
FB - Teflon ICP-OES
Ca ¦ Mg» NaA K
0.25
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Analysis Date
i
Wood Environment & Infrastructure Solutions, Inc. - Project No. 6064216003
18 of 18
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