Clean Air Status and Trends Network
Third Quarter 2016 Quality Assurance Report
Summary of Quarterly Operations (July through September)
EPA Contract No. EP-W-16-015
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 third
quarter 2016. The various QA/QC criteria and policies are documented in the CASTNET Quality
Assurance Project Plan (QAPP; Amec Foster Wheeler, 2016). 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
Investigation into the cause of the anomalous sulfur dioxide (S02) filter pack concentration
measurements for third and fourth quarter 2015 continued. The laboratory had changed to a
different supplier of the cellulose filter impregnation solution in April 2015, which continued
through October 2015 and affected filter pack samples from mid-May through December 2015.
Corrective action was initiated under International Organization for Standardization
(ISO)/lnternational Electrotechnical Commission (IEC) 17025:2005 management system
protocol. Amec Foster Wheeler continued addressing the next steps as outlined in Corrective
Action CA_0053 and the Filter Pack S02 Issue Summary (versions 4 and 5) during third quarter.
Actions outlined by CA_0053 were completed by the end of third quarter.
A new format for the quarterly data summary was used for preparation of the report, which was
submitted to EPA on July 29, 2016, and September 29, 2016 (first and second quarter 2016,
respectively). Beginning with the Second Quarter 2016 Data Summary, production of the report
and the associated data analysis was moved up by one month from the previous quarterly
submittal date. Future quarterly summary reports will be submitted at the end of March, June,
September, and December each year.
The laboratory began the process of ordering the next year's supply of filters and reagents.
During August, the flagging protocol agreed upon for the May through December 2015 S02 data
was applied to the data set and evaluated. Evaluation revealed that western sites still showed
unreasonably elevated concentrations and require a more rigorous invalidation criterion. An
updated criterion will be developed and tested.
Personnel from the North Carolina Department of Environmental Quality (NCDEQ) completed
audits of the ozone systems at CASTNET sites within the state and completed checks of the
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third-party data collection equipment installed by NCDEQ last year at these ozone sites. One of
Amec Foster Wheeler's field subcontractors met NCDEQ at each site. All sites passed the
audits. The NCDEQ's goal was to determine if CASTNET data are comparable with the North
Carolina ozone network, and they are. It is likely that NCDEQ will regularly perform audits of
CASTNET ozone sites in the future.
CASTNET ozone site CNT169, WY failed an independent audit during a visit in July, but the
auditor decided to re-audit the site after review of the audit data and metadata. These data
indicated possible problems with the pneumatic connections during the audit. The audit of
CNT 169 was repeated in August, and results passed. Additionally, BFT142, NC failed a
National Performance Audit Program (NPAP) audit during the quarter. Review of the audit data
and auditor field notes indicated system moisture intrusion was observed during the audit. Amec
Foster Wheeler is evaluating possible actions to prevent such issues. EPA Region 4 will
schedule a re-audit of this site as their schedule permits.
Safety audits of the BEL116, MD; BVL130, IL; and NPT006, ID sites took place during third
quarter 2016. No safety issues were found.
Amec Foster Wheeler received results for sample analyses for proficiency test study 108 for
Rain and Soft Waters from the National Laboratory of Environmental Testing, a branch of the
National Water Research Institute with Environment Canada that provides QA services. All
CASTNET measured parameters received a performance rating of "ideal." However, analyses
of conductivity were flagged "high bias" at 2.9 percent. Amec Foster Wheeler's proficiency test
plan under the ISO/I EC 7025:2005 accreditation by the American Association for Laboratory
Accreditation does not require action for bias below 5 percent for a single parameter unless it is
a consecutive finding for that parameter. Amec Foster Wheeler's analytical laboratory continued
to be rated, "very good," the highest rating available.
Table 1 lists the quarters of data that were validated to Level 3 during third quarter 2016
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
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in sealed packaging are also included. Table 6 presents the number of analyses in each
category that were performed during third quarter 2016.
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 third quarter 2016.
Data Quality Indicator (DQI) Results
Figures 1 through 3 present the results of RF, CCV, and RP QC sample analyses for third
quarter 2016. All results were within the criteria listed in Table 3. Results for sulfate nylon filter
analyses for one RF sample and one RP sample appear high on the graph but are within criteria
per established rounding rules at 105.3 and 20.2 percent respectively.
Table 8 presents summary statistics of critical criteria measurements at ozone sites collected
during third quarter 2016. 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 third quarter 2016, no results exceeded
documented criteria.
Table 9 presents summary statistics of critical criteria measurements at trace-level gas
monitoring sites collected during third quarter 2016. 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 third quarter 2016. All recovery values were between 90 percent and
110 percent.
Blank Results
Figures 5 through 7 present the results of MB, LB, and FB QC sample analyses for third
quarter 2016. All third quarter results were within criteria (two times the reporting limit) listed in
Table 3.
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Suspect/Invalid Filter Pack Samples
Filter pack samples that were flagged as suspect or invalid during third quarter 2016 are listed in
Table 11. This table also includes associated site identification and a brief description of the
reason the sample was flagged. During third quarter, 24 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 third quarter 2016. The problem counts are sorted by a 30-, 60-, or 90-day time
period to resolution. A category for unresolved problems is also included. Time to resolution
indicates the period taken to implement corrective action. The third quarter table lists an
unusually large value for the 30-day category. This is due to Amec Foster Wheeler's utilization
of a 1-minute data resolution review tool to evaluate the effects of moisture. During this
evaluation, problem tickets were opened when the slightest indication of moisture was observed
in order to more closely examine the data for effects.
References
Amec Foster Wheeler Environment & Infrastructure, Inc. (Amec Foster Wheeler). 2016. Clean
Air Status and Trends Network (CASTNET) Quality Assurance Project Plan (QAPP)
Revision 8.3. 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.
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, D0l:10.1520/E0029-08. www.astm.org.
U.S. Environmental Protection Agency (EPA). 2015. Appendix A to Part 58 - Quality
Assurance Requirements for Monitors used in Evaluations of National Ambient Air
Quality Standards. 40 CFR Part 58.
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Table 1 Data Validated to Level 3 during Third Quarter 2016
Calibration
Months
Number of
Complete
Number of
Group*
Available
Months
Quarters
Quarters
E-3/W-10t
November 2015 -
6
Quarter 1 2016
1
April 2016
SE-4/MW-6*
January 2016 -
6
Quarter 1 2016 -
2
June 2016
Quarter 2 2016
Notes: * The sites contained in each calibration group are listed in Table 2.
f Contains ROM206 of the ROM406/ROM206 collocated pair
i Contains MCK131/231 collocated pair
Table 2 Field Calibration Schedule for 2016
Calibration
Group
Months
Calibrated
Sites
Calibrated
Eastern Sites (24 Total)
E-1
(8 Sites)
February/August
BEL116, MD1 WSP144, NJ ARE 128, PA PED108, VA
BWR139, MD CTH110, NY PSU106, PA VPI120, VA
E-2
(11 Sites)
April/October
ABT147, CT WST109, NH NIC001,NY EGB181,ON
ASH135, ME CAT175, NY WFM007, NY UND002, VT
HOW191, ME HWF187, NY2 WFM105, NY
E-3
(5 Sites)
May/November
KEF112, PA LRU 17, PA CDR119, WV
MKG113, PA PARI 07, WV
Southeastern Sites (11 Total)
SE-4
(7 Sites)
January/July
SND152, AL BFT142, NC COW005, NC SPD111,TN
GAS 153, GA CND125, NC COW137, NC
SE-5
(4 Sites)
February/August
CAD150, AR IRL141, FL
CVL151, MS SUM156, FL
Midwestern Sites (19 Total)
MW-6
(6 Sites)
January/July
CDZ171, KY MCK131, KY PNF126, NC2
CKT136, KY MCK231, KY ESP127, TN
MW-7
(9 Sites)
March/September
ALH157, IL VIN140, IN OXF122, OH
BVL130, IL3 RED004, MN QAK172, OH
STK138, IL DCP114, OH PRK134,WI
MW-8
(4 Sites)
April/October
SAL133, IN ANA115, Ml
HOX148, Ml UVL124, Ml
Western Sites (11 Total)
W-9
(5 Sites)
March/September
KNZ184, KS CHE185, OK ALC188, TX
KIC003, KS SAN189, NE
W-10
(6 Sites)
May/November
GTH161, CO NPT006, ID PND165, WY1
ROM206, CO1 CNT169, WY PAL190, TX
Notes: 1 Trace-level gas calibrations are performed quarterly in February, May, August, and November.
2 Trace-level gas calibrations are performed quarterly in January, April, July, and October.
3Trace-level gas calibrations are performed quarterly in March, June, September, and December.
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Table 3 Data Quality Indicators for CASTNET Laboratory Measurements
Analyte
Method
Precision1
(MARPD)
Accuracy2
(%)
Nominal
Reporting Limits
mg/L
lag/Filter
Ammonium (NH^)
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 (NO"3)
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 collocated filter samples and laboratory
precision based on replicate samples.
2This 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.
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
|jg/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, (Amec
Foster Wheeler, 2016).
Table 4 Ozone Critical Criteria*
Type of Check
Analyzer Response
Zero
Less than + 1.5 parts per billion (ppb)
Span
Less than or equal to + 7 percent between supplied and observed concentrations
Single Point QC
Less than or equal to + 7 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, 2015). 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
so2
Less than + 1.5 ppb
Less than or equal to + 10 percent between supplied and
observed concentrations
NOy
Less than + 1.5 ppb
CO
Less than + 30 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, 2015). 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 E29 (ASTM, 2008).
S02 = sulfur dioxide
NOy = total reactive oxides of nitrogen
CO = carbon monoxide
ppb = parts per billion
Table 6 QC Analysis Count for Third Quarter 2016
Filter
Type
Parameter
RF
Sample
Count
CCV
Sample
Count
RP
Sample
Count
MB
Sample
Count
LB
Sample
Count
FB
Sample
Count
Teflon
so2"
59
207
87
18
26
91
no3
59
207
87
18
26
91
nh+4
36
184
86
18
26
91
cr
59
207
87
18
26
91
Ca2+
38
191
87
19
26
91
Mg2+
38
191
87
19
26
91
Na+
38
191
87
19
26
91
K+
38
191
87
19
26
91
Nylon
so2"
55
207
85
17
28
91
no3
55
207
85
17
28
91
Cellulose
SO2"
69
233
87
18
28
92
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Table 7 Filter Pack Receipt Summary for Third Quarter 2016
Count of samples received more than 14 days
after removal from tower:
14
Count of all samples received:
817
Fraction of samples received within 14 days:
0.983
Average interval in days:
4.416
First receipt date:
07/01/2016
Last receipt date:
09/29/2016
Table 8 Ozone QC Summary for Third Quarter 2016 (1 of 2)
% Single Single Zero
% Span Span Point QC Single Point Point % Zero Average
Site ID Pass1 |%D |2 Pass1 QC |%D|2 QC CL3 Pass1 (ppb)2
ABT147, CT
100.00
1.55
100.00
1.63
0.12
95.65
0.48
ALC188, TX
94.44
2.73
100.00
1.94
0.12
100.00
0.23
ALH157, IL
100.00
1.29
100.00
0.95
0.16
100.00
0.13
ANA115, Ml
100.00
1.06
100.00
0.91
0.22
100.00
0.13
ARE128, PA
100.00
0.93
100.00
0.98
0.12
100.00
0.26
ASH135, ME
100.00
0.85
100.00
0.70
0.09
100.00
0.14
BEL116, MD
98.90
1.86
98.90
1.47
0.34
95.60
0.40
BFT142, NC
96.88
1.73
100.00
1.38
0.21
98.96
0.21
BVL130, IL
100.00
0.90
98.92
1.41
0.22
100.00
0.36
BWR139, MD
100.00
1.66
97.78
2.20
0.31
92.39
0.61
CAD150, AR
100.00
1.28
97.73
1.51
0.41
93.18
0.53
CDR119, WV
100.00
2.58
100.00
2.64
0.17
100.00
0.34
CDZ171, KY
98.96
0.80
97.92
0.69
0.24
96.88
0.29
CKT136, KY
100.00
0.66
100.00
0.56
0.07
100.00
0.15
CND125, NC
100.00
2.64
100.00
2.41
0.19
100.00
0.36
CNT169, WY
100.00
2.22
100.00
0.99
0.18
100.00
0.66
COW137, NC
100.00
1.09
100.00
1.55
0.11
100.00
0.23
CTH110, NY
100.00
0.92
100.00
0.94
0.11
100.00
0.29
CVL151, MS
100.00
1.06
100.00
0.66
0.09
100.00
0.26
DCP114, OH
100.00
1.88
100.00
1.33
0.17
97.75
0.21
ESP127, TN
100.00
1.16
100.00
0.92
0.16
100.00
0.17
GAS153, GA
100.00
0.35
100.00
0.42
0.05
100.00
0.34
GTH161, CO
100.00
4.38
100.00
4.38
0.24
100.00
0.13
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Table 8 Ozone QC Summary for Third Quarter 2016 (2 of 2)
% Single Single Zero
% Span Span Point QC Single Point Point % Zero Average
Site ID Pass1 |%D |2 Pass1 QC |%D|2 QC CL3 Pass1 (ppb)2
HOX148, Ml
100.00
1.72
100.00
1.73
0.23
100.00
0.66
HWF187, NY
100.00
0.62
100.00
0.97
0.16
97.62
0.33
IRL141, FL
100.00
1.01
100.00
1.35
0.14
100.00
0.18
KEF112, PA
100.00
0.78
95.56
1.73
0.63
98.89
0.25
LRU 17, PA
93.75
6.56
95.24
4.16
3.39
95.24
0.81
MCK131, KY
98.92
1.53
100.00
0.88
0.12
98.92
0.34
MCK231, KY
100.00
1.50
100.00
1.69
0.18
100.00
0.31
MKG113, PA
100.00
0.76
98.75
0.88
0.25
91.25
0.45
OXF122, OH
100.00
2.03
98.88
2.83
0.22
98.88
0.87
PAL190, TX
97.14
1.26
98.51
1.23
0.29
97.01
0.48
PARI 07, WV
98.95
2.35
100.00
1.74
0.22
97.89
0.23
PED108, VA
100.00
1.97
100.00
1.87
0.24
100.00
0.20
PND165, WY
97.89
2.68
97.89
3.22
0.85
97.89
1.37
PNF126, NC
100.00
1.35
98.90
1.72
0.17
100.00
0.28
PRK134, Wl
100.00
2.58
98.89
2.36
0.30
98.89
0.38
PSU106, PA
100.00
0.71
100.00
0.50
0.12
97.87
0.43
QAK172, OH
97.83
3.21
97.85
3.12
1.88
97.85
1.06
ROM206, CO
100.00
1.04
100.00
0.90
0.12
100.00
0.16
SAL133, IN
98.91
1.50
100.00
1.21
0.19
95.65
0.53
SAN 189, NE
100.00
0.95
100.00
0.89
0.11
100.00
0.15
SND152, AL
100.00
1.25
100.00
1.25
0.09
100.00
0.29
SPD111, TN
100.00
1.00
96.51
1.75
0.49
97.67
0.55
STK138, IL
97.87
1.76
100.00
0.85
0.16
100.00
0.44
SUM156, FL
96.91
1.81
100.00
1.17
0.09
100.00
0.39
UVL124, Ml
100.00
0.80
100.00
0.67
0.12
97.87
0.23
VIN140, IN
100.00
2.38
98.96
2.43
0.18
100.00
0.30
VPI120, VA
100.00
0.93
100.00
1.05
0.18
100.00
0.29
WSP144, NJ
100.00
1.65
98.95
2.08
0.34
96.84
0.90
WST109, NH
100.00
0.95
98.92
1.30
0.26
98.92
0.27
Notes: 1 Percentage of comparisons that pass the criteria listed in Table 4. Values falling below 90 percent are addressed in Table 9.
2 Absolute value of the average percent differences between the on-site transfer standard and the site monitor. Values
exceeding the criteria listed in Table 4 are addressed in Table 9.
3 90 percent confidence limit of the coefficient of variation. This should be less than or equal to the 7 percent single point QC
check critical criterion. Values exceeding this criterion are addressed in Table 9.
%D = percent difference
CL = confidence limit
ppb = parts per billion
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Table 9 Trace-level Gas QC Summary for Third Quarter 2016
Parameter
% Span
Pass1
Span
|%D |2
% Single
Point QC
Pass1
Single Point
QC |%D|2
Single
Point
QC CL3
% Zero
Pass1
Zero
Average
(ppb)2
BEL116, MD
SO2
100.00
1.40
100.00
1.28
0.31
100.00
1.15
NOy
100.00
2.32
100.00
2.89
0.51
100.00
0.17
BVL130, IL
SO2
100.00
1.57
100.00
2.50
0.34
100.00
0.42
NOy
100.00
4.00
100.00
1.89
0.43
100.00
0.91
CO
100.00
0.52
91.11
5.29
1.17
88.89
18.23
HWF187, NY
NOy
100.00
1.02
100.00
2.67
0.39
100.00
0.39
PND165, WY
NOy
100.00
1.85
100.00
4.36
0.57
100.00
0.08
PNF126, NC
NOy
100.00
1.45
100.00
2.52
0.47
100.00
0.81
ROM206, CO
NOy
100.00
1.18
100.00
1.40
0.26
96.43
0.72
Notes: 1 Percentage of comparisons that pass the criteria listed in Table 5. Values falling below 90 percent are addressed in Table 10.
2 Absolute 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.
3 90 percent confidence limit of the coefficient of variation. This should be less than or equal to the 10 percent single point
QC check critical criterion. Values exceeding this criterion are addressed in Table 10.
%D = percent difference
CL = confidence limit
ppb = parts per billion
Table 10 Trace-level Gas QC Observations for Third Quarter 2016
Site ID
Parameter
QC Criterion
Comments
BVL130, IL
CO
% Zero Pass
Several QC check failures occurred throughout
the quarter, most likely due to an elevated
baseline resulting from an erroneous zero
point auto-reference by the analyzer.
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Table 11 Filter Packs Flagged as Suspect or Invalid during Third Quarter 2016
Site ID
Sample No.
Reason
BAS601, WY
1628005-01
1630008-01
Insufficient flow volume
BBE401, TX
1635004-02
The mass flow controller
malfunctioned and was replaced.
BEL116, MD
1635003-06
Power failure
BUF603, WY
1629006-02
Power failure
CAN407, UT
1636005-03
Insufficient flow volume
CDR119, WV
1628001-12
1630005-12
Data logger malfunction
CHA467, AZ
1629004-04
Insufficient flow volume
CHE185, OK
1629005-02
1631005-02
1633005-02
1634005-02
There were telemetry and data
logger issues. Data recovery is
underway.
CNT169, WY
1638003-16
Flow data are missing due to a
polling error.
DIN431, UT
1634004-06
Insufficient flow volume
KIC003, KS
1629005-03
1630007-03
1631005-03
1632005-03
Leaks in the flow system and a
malfunctioning flow pump
MEV405, CO
1636005-15
Flow system malfunction
PAL190, TX
1628001-38
Data logger malfunction
PED108, VA
1635003-40
Flow data are missing due to a
polling error.
UND002, VT
1630005-52
1637003-52
Intermittent power fluctuations
resulted in problems with site
telemetry.
Table 12 Field Problems Affecting Data Collection
Days to Resolution
Problem Count
30
544
60
14
90
0
Unresolved by End of Quarter
20
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 1 Reference Standard Results for Third Quarter 2016 (percent recovery)
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Amec Foster Wheeler Environment <8 Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 2 Continuing Calibration Spike Results for Third Quarter 2016 (percent recovery)
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Amec Foster Wheeler Environment cS Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 3 Replicate Sample Analysis Results for Third Quarter 2016 (percent difference)
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Amec Foster Wheeler Environment <8 Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 4 Laboratory Control Sample Results for Third Quarter 2016 (percent recovery)
120
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Amec Foster Wheeler Environment <8 Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 5 Method Blank Analysis Results for Third Quarter 2016 (total micrograms)
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Amec Foster Wheeler Environment <8 Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 6 Laboratory Blank Analysis Results for Third Quarter 2016 (total micrograms)
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Amec Foster Wheeler Environment <8 Infrastructure, Inc. - Project No. 6064160003
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EPA Contract No. EP-W-16-015
CASTNET Quality Assurance Report - Third Quarter 2016
Figure 7 Field Blank Analysis Results for Third Quarter 2016 (total micrograms)
0.45
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