CASTNET Quality Assurance Report Second Quarter 2012

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Summary of Quarterly Operations (April - June)
EPA Contract No. EP-W-09-028

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 2012. The results presented for filter pack data collection and field calibrations
are generated from data extracted from the CASTNET Data Management Center database using
the CASTNET Data Management System Application. The various QA/QC criteria and policies
are documented in the CASTNET Quality Assurance Project Plan (QAPP). 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.

The CASTNET QAPP Revision 8.0 was approved by EPA during April 2012.

During second quarter 2012, AMEC Environment & Infrastructure, Inc. (AMEC) continued
working with the manufacturer of the flow transfer standards used for the network to resolve the
measurement errors AMEC discovered in 2011. AMEC and the manufacturer will continue
investigating with the goal of quantifying the error and providing users with a measure of
uncertainty for affected data. The corrective actions implemented by AMEC include:

• The requirement that all flow standard certification documents produced by the
manufacturer for AMEC standards include verification of pressure readings in the
range expected at network sites.

• The collection of audit data from both flow standard instruments during all
calibrations through the end of 2012.

During second quarter 2012, the CASTNET QA Manager completed an audit of site operator
forms for the trace-level gas analyzers at special study sites to verify that the information
collected fulfilled each form's purpose, as well as being accurately completed by the site
operator. Audit results indicated that the appropriate information is being recorded accurately

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CASTNET Quality Assurance Report — Second Quarter 2012

and completely. The audit also found that the current system needs an additional requirement to
document evaluation of zero/precision/span (ZPS) results by field personnel when the sequence
has been manually initiated and recorded by site operators. The CASTNET QA Manager
initiated appropriate corrective action by working with the Field and Data Operations managers
to establish a routine system for field operations form review and devise a system for
electronic archiving.

During first quarter 2012, the CASTNET QA Manager completed an audit of the preparation,
use, and return of the calibration and repair kits. The first phase of the audit focused on the
procedures and preparation of the calibration and repair kits used by field technicians. Minor
findings resulted in recommendations to revise the checklists used when packing the kits to
provide additional details for the packers and to evaluate implementing a peer review process.
The second phase consisted of an audit of the process and procedures for handling the kits after
they are returned to AMEC. To help ensure AMEC's field subcontractors provide complete
documentation, it was recommended that the forms be modified to provide reminders.
Subsequent follow up during second quarter 2012 verified that findings and recommendations
resulting from both phases of the audit were addressed and being implemented.

AMEC continued planning for an on-site technical systems audit (TSA) of AMEC's CASTNET
facility. A TSA of the facility is required by EPA since AMEC is the monitoring organization in
charge of CASTNET Air Quality System (AQS)-protocol sites. The auditing organization will
be RTI International, Inc. (RTI). The auditor will visit two field sites (CND125, NC and
BFT142, NC) and AMEC's Gainesville, FL facility during August 2012.

Table 1 lists the quarters of data that were validated to Level 3 during second quarter 2012
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 continuous field measurements. These criteria
apply to the instrument challenges performed during site calibrations. Table 4 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 5 presents the critical criteria for
ozone monitoring. All EPA-sponsored CASTNET sites that monitor ozone are configured to
meet EPA's AQS criteria for QA/QC procedures and are operated in accordance with Part 58 of
Title 40 of the Code of Federal Regulations.

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

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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 2012.

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 2012.

Data Quality Indicator (DQI) Results

Figures 1 through 3 present the results of RF, CCV, and RP QC sample analyses for second
quarter 2012. All results were within the criteria listed in Table 4.

Table 8 presents summary statistics of critical criteria measurements at AQS-protocol ozone sites
collected during the quarter. All data associated with QC checks that fail to meet the criteria
listed in Table 5 will be invalidated. Results in shaded cells either exceed documented criteria or
are otherwise notable. Table 9 presents observations associated with the shaded cell results in
Table 8.

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. The action limits for LCS
recovery are 80 percent and 120 percent. Figure 4 presents LCS analysis results for second
quarter 2012. All recovery values were between 95 percent and 110 percent.

Blank Results

Figures 5 through 7 present the results of MB, LB, and FB QC sample analyses for second
quarter 2012. All results were within criteria (two times the reporting limit) listed in Table 4.

Suspect/Invalid Filter Pack Samples

Filter pack samples that were flagged as suspect or invalid during second quarter 2012 are listed
in Table 10. This table includes associated site identification and a brief description of the reason
the sample was flagged. During second quarter, eight filter pack samples were invalidated.

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CASTNET Quality Assurance Report — Second Quarter 2012

Field Problem Count

Table 11 presents counts of field problems affecting continuous data collection for more than one
day during second quarter 2012. 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.

Field Calibration Results

Calibrations were performed at 21 sites during second quarter 2012. All sites and parameters
were within the criteria listed in Table 3 with the exception of one parameter at the site listed in
Table 12.

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CASTNET Quality Assurance Report — Second Quarter 2012

Table 1. Data Validated to Level 3 during Second Quarter 2012

Calibration
Group*

Months
Available

Number of
Months

Complete
Quarters

Number of
Quarters

E-l/SE-5

August 2011 —
January 2012

6

Quarter 4 2011

1

MW-7/W-9

September 2011 —
February 2012

6

Quarter 4 2011

1

E-2/MW-8

October 2011 —
March 2012

6

Quarter 4 2011 —
Quarter 1 2012

2

Note: * The sites contained in each calibration group are listed in Table 2.

Table 2. Field Calibration Schedule

Calibration
Group

Months
Calibrated

Sites
Calibrated

Eastern Sites (20 Total)

E-l

(8 Sites)

February/August

BEL 116, MD WSP144, NJ ARE 128, PA PED108,VA
BWR139, MD CTH110, NY PSU106, PA VPI120,VA

E-2
(7 Sites)

April/October

ABT147, CT H0W132, ME CAT175,NY EGB181 ON
WST109, NH ASH135, ME HWF187,NY

E-3
(5 Sites)

May/November

KEF 112, PA LRL117, PA CDR119,WV
MKG113, PA PARI07, WV

Southeastern Sites (10 Total)

SE-4
(6 Sites)

January/July

SND152, AL BFT142, NC COW137,NC
GAS 153, GA CND125, NC PNF126,NC

SE-5
(4 Sites)

February/August

CAD 150, AR IRL141, FL
CVL151, MS SUM 15 6, FL

Midwestern Sites (18 Total)

MW-6
(6 Sites)

January/July

CDZ171, KY MCK131, KY ESP127, TN
CKT136, KY MCK231, KY SPD111,TN

MW-7
(8 Sites)

March/September

ALH157, IL STK138, IL DCP114, OH QAK172, OH
BVL130, IL VIN140, IN OXF122, OH PRK134,WI

MW-8
(4 Sites)

April/October

SAL133, IN ANA115, MI
HOX148, MI UVL124, MI

Western Sites (9 Total)

W-9
(4 Sites)

March/September

KNZ184, KS SAN 189, NE
CHE185, OK ALC188, TX

W-10

(5 Sites)

May/November

GTH161, CO CNT169, WY PAL190,TX
ROM206, CO PND165, WY

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Table 3. Data Quality Indicators for CASTNET Continuous Measurements

Measurement

Criteria1

Parameter2

Method

Precision

Accuracy

Filter pack flow

Mass flow controller

± 10%

±5%

Ozone3

UV absorbance

All points within ± 2% of full scale of best fit
straight line

Linearity error <5%

Wind speed

Anemometer

± 0.5 m/s

The greater of ± 0.5 m/s
for winds < 5 m/s or
± 5% for winds > 5 m/s

Wind direction

Wind vane

±5°

±5°

Sigma theta

Wind vane

Undefined

Undefined

Ambient temperature

Platinum RTD

± 1.0°C

±0.5°C

Delta temperature

Platinum RTD

± 0.5°C

±0.5°C

Relative humidity

Thin film capacitor

± 10% (of full scale)

± 10%

Precipitation

Tipping bucket rain
gauge

± 10% (of reading)

± 0.05 inch4

Solar radiation

Pyranometer

± 10% (of reading taken
at local noon)

± 10%

Surface wetness

Conductivity bridge

Undefined

Undefined

Notes: °C = degrees Celsius

m/s = meters per second

RTD = resistance-temperature device

UV = ultraviolet

1	Precision criteria apply to collocated instruments, and accuracy criteria apply to calibration of instruments. Collocated precision criteria
do not apply to AQS-protocol ozone measurements.

2	As of January 2011, meteorological parameters were only measured at four of the EPA-sponsored CASTNET sites: PAL 190, TX;
CHE 185, OK; BVL130, IL; and BEL116, MD.

3	Ozone is not measured at two EPA-sponsored CASTNET sites: EGB181, ON and CAT175, NY.

4	For target value of 0.50 inch

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CASTNET Quality Assurance Report — Second Quarter 2012

Table 4. Data Quality Indicators for CASTNET Laboratory Measurements

Analyte

Method

Precision1
(MARPD)

Accuracy2
(%)

Nominal
Reporting Limits

mg/L

(ig/Filter

Ammonium (NH4)

AC

20

90-110

0.020*

0.5

Sodium (Na+)

ICP-AES

20

95 - 105

0.005

0.125

Potassium (K+)

ICP-AES

20

95 - 105

0.006

0.15

Magnesium (Mg2 )

ICP-AES

20

95 - 105

0.003

0.075

Calcium (Ca2+)

ICP-AES

20

95 - 105

0.006

0.15

Chloride (CI )

IC

20

95 - 105

0.020

0.5

Nitrate (N03)

IC

20

95 - 105

0.008*

0.2

Sulfate (SO4)

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.

2

This column lists laboratory accuracy goals based on reference standards and continuing calibration verification spikes. The criterion is
90-110 percent for ICP-AES reference standards.

AC	= automated colorimetry

IC	= ion chromatography

ICP-AES = inductively coupled plasma-atomic emission spectrometry
MARPD = mean absolute relative percent difference
*	= as nitrogen

Values are rounded according to American Society for Testing and Materials (ASTM) (Standard Practice for Using Significant Digits in Test Data to Determine Conformance with
Specifications E 29).

For more information on analytical methods and associated precision and accuracy criteria, see the CASTNET QAPP, Revision 8.0
(AMEC, 2012)

Table 5. AQS-Protocol Ozone Critical Criteria*

Type of Check

Analyzer Response

Zero

Less than ±10 parts per billion (ppb)

Span

Less than or equal to ± 7 percent between supplied and observed concentrations

One Point QC

Less than or equal to ± 7 percent between supplied and observed concentrations

Note: * All EPA-sponsored CASTNET sites that monitor ozone are configured to meet EPA's AQS criteria for QA/QC procedures and are
operated in accordance with Part 58 of Title 40 of the Code of Federal Regulations.

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CASTNET Quality Assurance Report — Second Quarter 2012

Table 6. QC Analysis Count for Second Quarter 2012

Filter
Type

Parameter

RF
Sample
Count

ccv

Sample
Count

RP
Sample
Count

MB
Sample
Count

LB
Sample
Count

FB
Sample
Count

Teflon

so2;

30

156

68

15

24

44



no;

30

156

76

15

24

44



nh;

30

157

81

15

24

44



cr

30

156

66

15

24

42



Ca2+

31

159

72

15

24

42



Mg2+

31

159

72

15

24

42



Na+

31

159

72

15

24

42



K+

31

159

72

15

24

42

Nylon

so2;

29

145

60

14

24

44



no;

29

145

70

14

24

44

Cellulose

so2;

36

147

73

18

24

42

Table 7. Filter Pack Receipt Summary for Second Quarter 2012

Count of samples received more than 14 days
after removal from tower:

10

Count of all samples received:

1083

Fraction of samples received within 14 days:

0.991

Average interval in days:

3.371

First receipt date:

04/02/2012

Last receipt date:

06/29/2012

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Table 8. AQS-Protocol Ozone QC Summary (1 of 2)

Site ID

% Span
Pass1

Span

|%D |2

% One
Point QC

Pass1

One Point

QC |%D|2

One Point
QC CL3

% Zero
Pass1

Zero
Average
(PPb)2

ABT147, CT

100.00

0.59

100.00

0.87

0.17

100.00

0.46

ALC188, TX

100.00

1.01

96.74

1.79

0.53

94.57

2.65

ALH157, IL

98.72

1.81

98.72

1.43

0.81

98.72

1.05

ANA115, MI

100.00

1.15

100.00

1.01

0.12

100.00

0.44

ARE128, PA

98.88

0.40

97.75

0.74

0.21

100.00

0.57

ASH135, ME

100.00

4.47

100.00

4.38

0.12

100.00

0.34

BEL 116, MD

90.24

10.62

89.87

10.47

4.81

92.77

1.89

BFT142, NC

96.55

2.77

93.10

3.66

2.16

96.55

3.65

BVL130, IL

69.44

18.48

66.67

13.70

3.85

100.00

0.85

BWR139, MD

100.00

0.98

98.90

1.26

0.36

95.60

3.29

CAD 150, AR

98.90

1.18

100.00

1.25

0.11

98.90

0.57

CDR119, WV

100.00

1.00

100.00

0.93

0.08

100.00

0.91

CDZ171, KY

100.00

0.35

100.00

0.32

0.06

100.00

0.25

CKT136, KY

95.65

4.14

96.74

3.76

2.18

96.74

2.80

CND125, NC

91.40

8.01

91.40

7.59

3.89

91.40

3.24

CNT169, WY

100.00

1.10

98.82

2.87

0.31

100.00

0.34

COW 13 7, NC

100.00

0.96

100.00

0.76

0.09

100.00

0.29

CTH110, NY

97.83

3.63

97.83

2.19

1.19

97.83

1.26

CVL151, MS

96.77

4.69

94.62

5.85

2.40

95.70

3.05

DCP114, OH

93.55

4.10

93.55

4.37

1.84

100.00

0.51

ESP127, TN

100.00

0.22

100.00

0.34

0.05

98.90

2.45

GAS 153, GA

100.00

0.58

100.00

0.74

0.07

100.00

1.28

GTH161, CO

100.00

1.34

100.00

1.45

0.20

100.00

0.18

HOW 132, ME

100.00

1.44

100.00

1.38

0.17

100.00

0.66

HOX148, MI

98.92

0.58

100.00

0.44

0.07

100.00

0.16

HWF187, NY

97.85

4.33

97.85

3.83

1.65

97.85

1.17

IRL141, FL

100.00

0.44

100.00

0.69

0.11

100.00

3.75

KEF 112, PA

100.00

0.68

100.00

0.70

0.08

98.91

0.78

KNZ184, KS

100.00

0.46

100.00

0.59

0.09

98.90

2.38

LRL117, PA

100.00

2.33

100.00

1.73

0.13

100.00

0.57

MCK131, KY

100.00

1.97

100.00

2.09

0.11

100.00

0.56

MCK231, KY

100.00

1.86

100.00

1.77

0.07

98.91

1.46

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Table 8. AQS-Protocol Ozone QC Summary (2 of 2)

Site ID

% Span
Pass1

Span

|%D |2

% One
Point QC

Pass1

One Point

QC |%D|2

One
Point

QC CL3

% Zero
Pass1

Zero
Average
(PPb)2

MKG113, PA

100.00

0.69

100.00

0.71

0.08

100.00

0.40

OXF122, OH

100.00

1.06

98.75

2.37

2.03

100.00

0.96

PAL 190, TX

100.00

1.16

100.00

0.84

0.07

100.00

0.41

PARI 07, WV

100.00

1.09

100.00

0.92

0.22

100.00

0.91

PED108, VA

100.00

0.66

100.00

0.53

0.13

100.00

0.69

PND165, WY

98.25

3.17

98.25

1.81

1.43

98.25

1.28

PNF126, NC

100.00

0.52

100.00

0.47

0.07

100.00

0.30

PRK134, WI

100.00

0.76

100.00

0.58

0.08

100.00

0.99

PSU106, PA

96.67

4.06

96.70

3.47

2.28

96.67

1.26

QAK172, OH

100.00

1.89

100.00

2.51

0.10

98.89

0.95

ROM206, CO

100.00

2.07

100.00

2.48

0.09

100.00

0.49

SAL133, IN

100.00

0.79

100.00

0.95

0.09

100.00

0.65

SAN 189, NE

100.00

0.75

100.00

0.57

0.07

100.00

0.78

SND152, AL

100.00

1.53

100.00

1.31

0.07

98.90

0.44

SPD111, TN

96.74

2.07

98.91

0.93

0.25

100.00

0.44

STK138, IL

100.00

3.23

100.00

3.62

0.05

100.00

0.55

SUM 15 6, FL

100.00

0.40

100.00

0.48

0.08

98.88

0.73

UVL124, MI

100.00

1.34

100.00

1.37

0.15

100.00

0.22

VIN140, IN

100.00

0.55

100.00

0.72

0.07

100.00

0.25

VPI120, VA

96.10

4.53

96.10

4.50

3.02

96.10

2.37

WSP144, NJ

93.48

1.15

95.65

1.41

0.31

98.91

0.88

WST109, NH

100.00

3.45

100.00

3.93

0.18

100.00

0.79

Notes: 1 Percentage of comparisons that pass the criteria listed in Table 5. 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 5 are addressed in Table 9.

3	90% confidence limit of the coefficient of variation. This should be less than or equal to the 7% one 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. AQS-Protocol Ozone QC Observations

Site ID

QC Criterion

Comments

BEL 116, MD

Span %D ; Single Point
QC %D

The zero air system tubing was disconnected for one
week. Ambient data collection was not affected.

BVL130, IL

%Span Pass; Span %D ; %
Single Point QC Pass;
Single Point QC %D

The site analyzer failed during the last week in May.
Associated ambient data were invalidated.
Additionally, the site transfer standard failed mid-June
and was replaced at the end of the month. Ambient
data were not directly affected but the frequency
criterion was not met.

CND125, NC

Span %D ; Single Point
QC |%D|

The zero air system tubing was disconnected for one
week. Ambient data collection was not affected.

Notes: %D = percent difference

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Table 10. Filter Packs Flagged as Suspect or Invalid

Site ID

Sample No.

Reason

CAT175, NY

1217001-15

"Calibrator Onsitc" data logger
status left as true for the latter half
of the week

CHE185, OK

1215001-19

Polling problems

GRB411, NV

1214001-33
1215001-33
1216001-33

Invalidated due to suspect data

HOW 132, ME

1217001-37
1220001-37

Power failures

WNC429, SD

1222001-80

Data logger channel down

Table 11. Field Problems Affecting Data Collection

Days to Resolution

Problem Count

30

100

60

10

90

0

Unresolved by End of Quarter

7

Table 12. Field Calibration Failures by Parameter

Site ID

Parameter(s)

CNT169, WY

Temperature

Note: Per CASTNET project protocols, data for all parameters except flow are flagged as
"suspect" (S) but still considered valid if the calibration criterion is not exceeded by
more that its magnitude (i.e., if within 2x the criterion). If flow calibrations fall
within 2x the criteria, these data are adjusted per approved protocol described in the
CASTNET QAPP, Revision 8.0 (AMEC, 2012). Please refer to Table 8 for
documentation of the QC failures affecting the validity of AQS-protocol
ozone data.

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CASTNET Quality Assurance Report — Second Quarter 2012

Figure 1. Reference Standard Results for Second Quarter 2012 (percent recovery)

RF - Teflon ICP-AES

110.0

107.5

95.0
925
90.0

Mq

4	1-

RF-Teflon IC&AC

T934

TNQ3

LaJ
TNH4

107.5
105.0
102.5
| 100.0
: 975
95.0
925

: $

: «

~ ^ ~

RF - Nylon IC

975
95.0
925
90.0

NSQ4

NHNQ3

RF-Cellulose IC

WSQ2

107.5 -
105.0 -
102.5 -
| 100.0 -
: 975 -
95.0 -
925 -

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Figure 2. Continuing Calibration Spike Results for Second Quarter 2012 (percent recovery)

110.0
107.5

95.0
925
90.0

107.5
105.0
102.5
| 100.0
: 975
95.0
925

975
95.0
925
90.0

CCV - Teflon ICP-AES

Mq

. i i M i i I i I ! ! 1 M

CO/- Teflon IC& AC

T934

TNQ3

LaJ
TNH4

tt

TT

!'



t t

' 5

CCV- Nylon IC

NSQ4

NHNQ3

CCV-Cellulose IC

wso2

107.5 -
105.0 -
102.5 -
| 100.0 -
: 975 -
95.0 -
925 -

AMEC Project No. 6064110218

14

AMEC Environment & Infrastructure, Inc.

-------
EPA Contract No. EP-W-09-028

CASTNET Quality Assurance Report — Second Quarter 2012

Figure 3. Replicate Sample Analysis Results for Second Quarter 2012 (percent difference)

20.0 -
17.5 -

RP-Teflon ICP-AES



rrmn

TSQ4

RP-Teflon IC&AC

TN03

EaJ
TNH4

15.0 -
12.5 -
10.0 -

1

b 7.5-

NSQ4

RP-Nylon IC

NHNQ3

#

Q 7.5-

WSQ2

RP -Cellulose IC

15.0 -
12.5 -
10.0 -

1

b 7.5-

AMEC Project No. 6064110218

15

AMEC Environment & Infrastructure, Inc.

-------
EPA Contract No. EP-W-09-028

CASTNET Quality Assurance Report — Second Quarter 2012

Figure 4. Laboratory Control Sample Results for Second Quarter 2012 (percent recovery)

LCS-Teflon ICP-AES



LCS-Teflon IC&AC

-X-*-

-X-



LCS-Nylon IC



-da-

Analysis Date

LCS-Cellulose IC

j2L

>«<

-*!T

Analysis Date

AMEC Project No. 6064110218

16

AMEC Environment & Infrastructure. Inc.

-------
EPA Contract No. EP-W-09-028

CASTNET Quality Assurance Report — Second Quarter 2012

Figure 5. Method Blank Analysis Results for Second Quarter 2012 (total micrograms)

0.15
0.14
0.13

0	°-12

1	0.11

O 0.10
0.09
0.08

IVB - Teflon ICP-AES





ooooooooooooooo

H	1	h

IVB-Teflon IC&AC

TSQ4

TN 03

TNH4

H	1	1	h

H	h

IVB- Nylon IC

m

N3Q4

NHNQ3

2.20 -

2.15 -

2.10 -

c 2.05 -

| 2.00 -

o 1.95 -
O

1.90 -
1.85 -

IVB -Cellulose IC

WSQ2

H	1	1	1	1	1	1	h

H	h

AMEC Project No. 6064110218

17

AA1EC Environment & Infrastructure. Inc.

-------
EPA Contract No. EP-W-09-028

CASTNET Quality Assurance Report — Second Quarter 2012

Figure 6. Laboratory Blank Analysis Results for Second Quarter 2012 (total micrograms)

LB - Teflon ICP^\ES

Mq

TSQ4

LB-Teflon IC&AC

TN 03

TNH4

LB-Nylon IC

m

NSQ4

NHNQ3

2.20 -
2.15 -
2.10 -
2.05 -
¦£ 2.00 -
1.95 -
1.90 -
1.85 -

WSQ2

LB-Cellulose IC

AMEC Project No. 6064110218

18

AMEC Environment & Infrastructure, Inc.

-------
EPA Contract No. EP-W-09-028

CASTNET Quality Assurance Report — Second Quarter 2012

Figure 7. Field Blank Analysis Results for Second Quarter 2012 (total micrograms)

FB - Teflon ICP-AES

~ Ca . Mg ONa XK

FB - Teflon IC & AC

XTSQ4 OTN03 TNH4 ~CI

X NS04 O NHN03

FB - Cellulose IC

AMEC Project No. 6064110218

19

AMEC Environment & Infrastructure. Inc.

-------