3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 1 OF 25

Final Report

Analysis of PFOA, PFBS, PFHS, and PFOS in Aqueous Samples from 

3M Decatur, Alabama: Groundwater Treatment Plant GAC System –

December 2013

Laboratory Request Number: ISO13-07-11

Method Requirement: 3M Method ETS-8-044.1

Report Date – Date of Last Signature

Testing Laboratory

3M EHS&S Operations

3M Environmental Laboratory

Building 260-5N-17

Maplewood, MN 55144-1000

Requester 

Gary Hohenstein

3M Building 224-5W-03

Saint Paul, MN 55144-1000

Phone: (651) 737-3570

The testing reported herein meet the requirements of ANSI/ISO/IEC 17025:2005 

“General Requirements for the Competence of Testing and Calibration Laboratories”, in 

accordance with the A2LA Testing Certificate # 2052.01. Additionally, the laboratory’s 

quality system has been audited and was determined to be in conformance with the 

EPA GLPs (40 CFR 792) by an independent A2LA assessment.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 2 OF 25

3M Environmental Laboratory

3M Environmental Laboratory Technical Director: William K. Reagen, Ph.D.

3M Principal Analytical Investigator: Susan Wolf

Report Author: Chelsie Grochow

Analytical Report ISO13-07-11

3M Decatur Groundwater Treatment Plant System; December 2013 Sampling 

Report Date: Date of Last Signature

1 Introduction/Summary 

The 3M Environmental Laboratory analyzed water samples from the groundwater treatment plant GAC 

system at the 3M Decatur, AL facility. Water samples were collected by Weston Solutions personnel 

on December 13, 2013. Samples were returned to the 3M Environmental Laboratory for analysis of 

Perfluorooctanoate (PFOA), Perfluorobutane sulfonate (PFBS), Perfluorohexane sulfonate (PFHS),

Perfluorooctane sulfonate (PFOS) under laboratory project number ISO13-07-11. Analysis of the 

samples was completed as specified under 3M Environmental Laboratory General Project Outline 

(GPO) number GPO11-1006.

The 3M Environmental Laboratory provided sample containers for seven sampling locations; ACI, 

ACM2, ACE, WW8R, WW9R, WW10R, and WW11R. The sample set consisted of a field sample, field 

sample duplicate and a field matrix spike. Each empty container was marked with a “fill to here” line 

that corresponded to a final volume of 200 mL. Containers reserved for field matrix spikes were 

fortified with an appropriate matrix spike solution containing all analytes prior to being sent to the field 

for sample collection. Sample bottles for sampling locations ACM2 and ACE, along with the Trip Blank 

sample and low spike, were fortified with internal standards and surrogates prior to being sent to the 

field for sample collection. Due to an error during the bottle prep, internal standard was not added to 

the ACE FMS sample prior to analysis. 

Samples were prepared and analyzed by method ETS-8-044.1 “Method of Analysis for the 

Determination of Perfluorinated Compounds in Water by LC/MS/MS; Direct Injection Analysis”. Select 

internal standards were used to aid in the data quality objectives. 

Table 1 summarizes the sample results using the analytical method identified above. All results for 

quality control samples prepared and analyzed with the samples will be reported and discussed 

elsewhere in this report.

The testing reported herein meet the requirements of ANSI/ISO/IEC 17025:2005 “General 

Requirements for the Competence of Testing and Calibration Laboratories”, in 

accordance with the A2LA Testing Certificate # 2052.01. Additionally, the laboratory’s 

quality system has been audited and was determined to be in conformance with the EPA 

GLPs (40 CFR 792) by an independent A2LA assessment.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 3 OF 25

Table 1. Sample Results Summary

3M LIMS ID Sample Description

PFOA 

Concentration 

(ng/mL)

PFBS 

Concentration 

(ng/mL)

PFHS 

Concentration 

(ng/mL)

PFOS 

Concentration 

(ng/mL)

ISO13-07-11-001 DAL-GW-ACI; Sample 1840 1330 687 1960

ISO13-07-11-002 DAL-GW-ACI; Sample Dup 1820 1360 703 1980

Average 1830 (1) 1350 (1) 695 (1) 1970 (1)

%RPD Sample/Sample Dup 1.1 2.2 2.3 1.0

ISO13-07-11-004 DAL-GW-ACM2; Sample 0.0729 1430 0.0587 0.531

ISO13-07-11-005 DAL-GW-ACM2; Sample Dup 0.0775 1440 0.0829 0.606

Average 0.0752 (2) 1440 (1) 0.0708 (2) 0.569 (2)

%RPD Sample/Sample Dup 6.1 0.69 34 (3) 13

ISO13-07-11-007 DAL-GW-ACE; Sample 0.0728 0.0725 <0.0500 0.0276

ISO13-07-11-008 DAL-GW-ACE; Sample Dup 0.0868 0.0806 0.0648 0.0330

Average 0.0798 (2) 0.0766 (2) 0.0648 (2) 0.0303 (2)

%RPD Sample/Sample Dup 18 11 NA 18

ISO13-07-11-010 DAL-GW-WW8R; Sample 2700 316 1260 4070

ISO13-07-11-011 DAL-GW-WW8R; Sample Dup 2730 316 1270 4050

Average 2720 (1) 316 (1) 1270 (1) 4060 (1)

%RPD Sample/Sample Dup 1.1 0.0 0.79 0.49

ISO13-07-11-013 DAL-GW-WW9R; Sample 2670 264 1170 4160

ISO13-07-11-014 DAL-GW-WW9R; Sample Dup 2700 253 1160 4210

Average 2690 (1) 259 (1) 1170 (1) 4190 (1)

%RPD Sample/Sample Dup 1.1 4.2 0.85 1.2

ISO13-07-11-019 DAL-GW-WW10R; Sample 1910 239 889 2950

ISO13-07-11-020 DAL-GW-WW10R; Sample Dup 1870 238 880 2890

Average 1890 (1) 239 (1) 885 (1) 2920 (1)

%RPD Sample/Sample Dup 2.1 0.42 1.0 2.1

ISO13-07-11-022 DAL-GW-WW11R; Sample 1050 200 515 1570

ISO13-07-11-023 DAL-GW-WW11R; Sample Dup 1060 195 508 1560

Average 1060 (1) 198 (1) 512 (1) 1570 (1)

%RPD Sample/Sample Dup 0.94 2.5 1.4 0.64

NA = Not Applicable

(1) Reported results were prepared and analyzed by ETS-8-044.1 using external standard calibration. The analytical method 

uncertainties associated with the reported results are as follows: PFOA ±17%, PFBS ±17%, PFHS ±16%, and PFOS ±21%.

(2) Reported results were prepared and analyzed by ETS-8-044.1 using internal standard calibration. The analytical method 

uncertainties associated with the reported results are as follows: PFOA ±17%, PFBS ±14%, PFHS ±23%, and PFOS ±21%.

(3) Sample/sample duplicate RPD did not meet acceptance criteria of ≤20%.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 4 OF 25

2 Methods - Analytical and Preparatory

2.1 Methods

Analysis was completed using 3M Environmental Laboratory Method ETS-8-044.1 “Method of Analysis 

for the Determination of Perfluorinated Compounds in Water by LC/MS/MS; Direct Injection Analysis”.

Table 2. Target Analytes

Target Analytes Acronym

Reference 

Material Structure

Perfluorooctanoic Acid (C8 Acid) PFOA Linear + Branched

Perfluorobutanesulfonate (C4 Sulfonate ) PFBS Linear

Perfluorohexanesulfonate (C6 Sulfonate) PFHS Linear

Perfluorooctanesulfonate (C8 Sulfonate) PFOS Linear + Branched

2.2 Sample Collection

Samples were collected on December 13, 2013 in NalgeneTM (high-density polyethylene) bottles 

prepared at the 3M Environmental Laboratory. Prior to sample collection, bottles designated for field 

matrix spikes were spiked in the laboratory with a known volume of an appropriate matrix spiking 

solution containing PFOA, PFBS, PFHS, and PFOS. Sample bottles for sampling locations ACM2 and 

ACE, along with the Trip Blank sample and low spike, were fortified with a mixture of mass-labeled 

internal standards at a nominal concentration of 1 ng/mL and a mixture of surrogate recovery standards 

at a nominal concentration of 0.1 ng/mL. Collected sample bottles were received by the laboratory at 

ambient conditions on December 18, 2013.

2.3 Sample Preparation

All samples were diluted with methanol and analyzed for all analytes. Samples diluted 1:10 were 

prepared by removing a 1 mL aliquot of the well mixed sample and adding 8.9 mL of methanol and 0.1 

mL of a surrogate spiking solution. The 1:100 dilutions were prepared by removing a 0.1 mL aliquot of 

the well mixed sample and adding 9.8 mL of methanol and 0.1 mL of a surrogate spiking solution. 

Prepared samples were analyzed by external standard calibration. Further dilution may have been 

applied by using a lower injection volume on the instrument. 

The ACE and ACM2 sample sets and the Trip Blank sample were prepared and analyzed for all 

analytes by transferring an aliquot of the well mixed sample into an autovial. Prepared samples were 

analyzed by internal standard calibration. Following sample analysis, it was discovered that the ACE

FMS sample was not fortified with internal standard. Therefore, internal standard was added to an 

aliquot of the ACE FMS sample, and the ACE sample set was re-analyzed by internal standard 

calibration. 

During the preparation of the laboratory control samples for internal standard calibration, an aliquot of a 

separate internal standard spiking solution was added to the laboratory control samples (nominal 

concentration of 1 ng/mL). The sample bottles for ACE, ACM2, and Trip Blank were spiked with an 

internal standard mix at a nominal concentration of 1 ng/mL prior to being sent to the field for sample 

collection. The laboratory control samples were analyzed in the same manner as the samples. 

2.4 Analysis

All samples and quality control samples were analyzed for four target analytes using high performance 

liquid chromatography/tandem mass spectrometry (HPLC/MS/MS). Pertinent instrument parameters, 

the liquid chromatography gradient program, and the specific mass transitions analyzed are described 

in the tables below.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 5 OF 25

Due to the nature of the sample, the wide range of concentrations found in the sample, and the 

environmental occurrence of multiple isomers of the laboratory’s analytes of interest, the software used 

for processing the analytical results is not able to consistently integrate the analytical peak, manual 

integration of the analytical peak is necessary. All manual integrations are performed following the 

procedures outlined in method ETS-12-010. The consistency of the laboratory’s integration is ensured 

through the training of laboratory personnel, the peer review process required for all manual 

integrations, the review of manual integrations by the QAU, and where necessary the review of manual 

integrations by laboratory management.

Table 3. Instrument Parameters.

Instrument Name ETS Buster

Analysis Dates

1/8/14 – external standard calibration

1/9/14 and 1/10/14 – internal standard calibration 

Analytical Method ETS-8-044.1

Liquid Chromatograph Agilent 1100

Guard column Betasil C18 (4.6 mm X 100 mm), 5 μ

Analytical column Betasil C18 (4.6 mm X 100 mm), 5 μ

Injection Volume 5 or 20 μL

Mass Spectrometer Applied Biosystems API 4000

Ion Source Turbo Spray

Polarity Negative

Software Analyst 1.6.1

Table 4. Liquid Chromatography Gradient Program.

Step 

Number

Total Time 

(min)

Flow Rate 

(μL/min)

Percent A

(2 mM ammonium acetate)

Percent B

(Methanol)

0 0.00 750 90.0 10.0

1 0.50 750 90.0 10.0

2 4.00 750 70.0 30.0

3 6.00 750 70.0 30.0

4 11.0 750 20.0 80.0

5 13.0 750 20.0 80.0

6 13.5 750 10.0 90.0

7 16.0 750 10.0 90.0

8 16.5 750 90.0 10.0

9 19.0 750 90.0 10.0
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 6 OF 25

Table 5. Mass Transitions.

Analyte

Mass Transition

Q1/Q3

Internal Standard (1) Mass Transition

Q1/Q3

PFOA

413/369

[

13 413/219 C8]PFOA 421/376

413/169

PFBS

299/80

[

18

O2]PFBS 303/84

299/99

PFHS

399/99

[

13C3]PFHS 402/80

399/80

PFOS

499/99

[

13 499/80 C8]PFOS 507/80

499/130

[

13C4]PFOA surrogate 417/372 [13C8]PFOA 421/376

[

13C4]PFOS surrogate 503/80 [13C8]PFOS 507/80

Dwell time was 20 msec for each transition. The individual transitions were summed to produce a “total ion chromatogram” 

(TIC), which was used for quantitation. 

(1) Internal standards were used for the analysis on 1/9/14 and 1/10/14.

3 Data Analysis

3.1 Calibration

External Standard Calibration Analysis on 1/8/14: Samples were analyzed against an external 

standard calibration curve. Calibration standards were prepared by spiking known amounts of the 

stock solution containing the target analytes into 90:10 methanol: Milli-Q laboratory water. A total of 

eleven spiked standards ranging from 0.02 ng/mL to 50 ng/mL (nominal) were analyzed. The 

standards also contained the surrogates at concentrations ranging from 0.02 ng/mL to 25 ng/mL 

nominal. A quadratic, 1/x weighted, calibration curve of the standard peak area counts was used to fit 

the data for each analyte. The data were not forced through zero during the fitting process. Calculating 

the standard concentrations using the peak area counts and the resultant calibration curve confirmed 

accuracy of each curve point. 

Internal Standard Calibration Analysis on 1/9/14 and 1/10/14: Samples were analyzed against a 

matrix-matched stable isotope internal standard calibration curve. Calibration standards were prepared 

by spiking known amounts of stock solutions into laboratory prepared reagent water. The calibration 

standards contained an internal standard mix at a nominal concentration of 1 ng/mL. A total of thirteen

calibration standards ranging from 0.025 ng/mL to 25 ng/mL (nominal) were analyzed with the prepared 

samples. Of these thirteen calibration standards, eleven contained the surrogates at concentrations 

ranging from 0.025 ng/mL to 10 ng/mL nominal. A quadratic, 1/x weighted, calibration curve of the 

ratio of the standard peak area counts over the internal standard peak area counts was used to fit the 

data for each analyte. The data were not forced through zero during the fitting process. Calculating the 

standard concentrations using the peak area ratios and the resultant calibration curve confirmed

accuracy of each curve point. 

For each calibration curve, the reference standards of PFOA and PFOS used to prepare the calibration 

standards consisted of both linear and branched isomers. Each curve point was quantitated using the 

overall calibration curve and reviewed for accuracy. Method calibration accuracy requirements of 

100±25% (100±30% for the lowest curve point) were met for all analytes. The correlation coefficient r 

was greater than 0.995 for all analytes.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 7 OF 25

3.2 System Suitability

A calibration standard was analyzed four times at the beginning of the analytical sequence to 

demonstrate overall system suitability. The acceptance criteria for system suitability samples is less 

than or equal to 5% relative standard deviation (RSD) for peak area/ratio and retention time criteria of 

less than or equal to 2% RSD. These criteria were met for all analytes.

3.3 Limit of Quantitation (LOQ)

The LOQ as defined in method ETS-8-044.1 is the lowest non-zero calibration standard in the curve 

that meets linearity and accuracy requirements and for which the area counts are at least twice those of 

the appropriate blanks. The LOQs associated with the sample analysis are listed in Table 6.

Table 6. LOQ

Analyte LOQ, ng/mL

1/8/14 Analysis

LOQ, ng/mL

1/9/14 Analysis

LOQ, ng/mL 

1/10/14 Analysis

PFOA 0.0192 (1) 0.0240 0.0287

PFBS 0.0200 (1) 0.0250 0.0250

PFHS 0.0200 (1) 0.0500 0.0500

PFOS 0.0185 (1) 0.0232 0.0232

(1) The dilution factor was not applied to the LOQ.

3.4 Continuing Calibration 

During the course of the analytical sequence, several continuing calibration verification samples 

(CCVs) were analyzed to confirm that the instrument response and the initial calibration curve were still

in control. The method acceptance criteria of 100% ± 25% was met for all analytes.

3.5 Blanks

Two types of blanks were prepared and analyzed with the samples: method blanks/solvent blanks and 

field/trip blanks. Each blank result was reviewed and used to evaluate method performance to 

determine the LOQ for each analyte.

3.6 Lab Control Spikes (LCSs) 

Low, mid, and high lab control spikes were prepared for the target analytes and analyzed in triplicate, 

while only low and high lab control spikes were prepared for the surrogates. LCSs were prepared by 

spiking known amounts of the analytes into either 10 mL of laboratory-prepared matrix matched water 

or 1 mL of Milli-Q water to produce the desired concentration. When applicable, the LCSs were then 

diluted with methanol in the same manner as the samples. Method ETS-8-044.1 states that the 

average recovery of LCSs at each spiking level be within 80%-120% with a RSD ≤20%. All LCS 

samples met method accuracy criteria except for the mid level LCSs for PFHS (123%) on 1/9/14 and 

PFOS (121%) on 1/10/14. A method deviation is included with the raw data.

All LCSs were used in the determination of the analytical method uncertainty in section 3.7. 

The following calculations were used to generate data in Table 7.

* 100%

Spike Concentration

Calculated Concentration LCSPercent Recovery =

* 100%

average LCS recovery

standard deviation LCS replicates LCS% RSD =
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 8 OF 25

Table 7. Lab Control Spike Results.

ETS-8-044.1

External Standard 

Calibration

Analyzed 1/8/14 PFOA (Linear + Branched) PFOA surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140108-1 0.191 0.180 94.2 0.199 0.222 112

LCS-140108-2 0.191 0.174 91.1 0.199 0.219 110

LCS-140108-3 0.191 0.176 92.1 0.199 0.217 109

Average ± %RSD 92.5% ± 1.7% 110% ± 1.4%

LCS-140108-4 4.74 4.86 102 4.94 5.16 105

LCS-140108-5 4.74 4.82 102 4.94 5.07 103

LCS-140108-6 4.74 4.79 101 4.94 5.07 103

Average ± %RSD 102% ± 0.57% 104% ± 1.1%

LCS-140108-7 38.2 38.0 99.6

LCS-140108-8 38.2 36.3 95.1

LCS-140108-9 38.2 35.9 94.0

Average ± %RSD 96.2% ± 3.1%

ETS-8-044.1

External Standard 

Calibration

Analyzed 1/8/14 PFBS PFHS

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140108-1 0.199 0.204 102 0.199 0.194 97.7

LCS-140108-2 0.199 0.201 101 0.199 0.211 106

LCS-140108-3 0.199 0.195 97.9 0.199 0.198 99.4

Average ± %RSD 100% ± 2.1% 101% ± 4.3%

LCS-140108-4 4.95 5.04 102 4.95 4.89 98.7

LCS-140108-5 4.95 5.03 102 4.95 4.83 97.6

LCS-140108-6 4.95 4.94 99.9 4.95 4.82 97.4

Average ± %RSD 101% ± 1.2% 97.9% ± 0.72%

LCS-140108-7 39.8 41.9 105 39.8 >ULOQ NA

LCS-140108-8 39.8 41.3 104 39.8 >ULOQ NA

LCS-140108-9 39.8 40.1 101 39.8 >ULOQ NA

Average ± %RSD 103% ± 2.0% NA

>ULOQ = analyte concentration exceeded upper limit of quantitation

NA = Not Applicable

(1) LCS recovery did not meet acceptance criteria of 100 ± 20%.
3M ENVIRONMENTAL LABORATORY

REPORT NO. ISO13-07-11

PAGE 9 OF 25

Table 7 continued. Lab Control Spike Results.

ETS-8-044.1

External Standard 

Calibration

Analyzed 1/8/14 PFOS (Linear + Branched) PFOS surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140108-1 0.185 0.178 96.2 0.190 0.226 119

LCS-140108-2 0.185 0.185 99.8 0.190 0.220 116

LCS-140108-3 0.185 0.179 96.7 0.190 0.236 124

Average ± %RSD 97.6% ± 2.0% 120% ± 3.4%

LCS-140108-4 4.59 4.79 104 4.73 5.38 114

LCS-140108-5 4.59 4.71 103 4.73 5.40 114

LCS-140108-6 4.59 4.76 104 4.73 5.35 113

Average ± %RSD 104% ± 0.56% 114% ± 0.51% 

LCS-140108-7 36.9 37.4 101

LCS-140108-8 36.9 36.0 97.6

LCS-140108-9 36.9 35.9 97.2

Average ± %RSD 98.6% ± 2.1%

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/9/14 PFOA (Linear + Branched) PFOA surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140109-1 0.190 0.201 106 0.198 0.230 116

LCS-140109-2 0.190 0.202 106 0.198 0.244 123

LCS-140109-3 0.190 0.208 110 0.198 0.235 119

Average ± %RSD 107% ± 2.2% 119% ± 3.0%

LCS-140109-4 1.90 2.20 116 1.98 2.40 121

LCS-140109-5 1.90 2.12 112 1.98 2.31 117

LCS-140109-6 1.90 2.20 116 1.98 2.35 119

Average ± %RSD 115% ± 2.0% 119% ± 1.7%

LCS-140109-7 19.0 20.7 109

LCS-140109-8 19.0 21.6 114

LCS-140109-9 19.0 22.1 116

Average ± %RSD 113% ± 3.2%

>ULOQ = analyte concentration exceeded upper limit of quantitation

NA = Not Applicable

(1) LCS recovery did not meet acceptance criteria of 100 ± 20%.
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REPORT NO. ISO13-07-11

PAGE 10 OF 25

Table 7 continued. Lab Control Spike Results.

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/9/14 PFBS PFHS

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140109-1 0.198 0.210 106 0.198 0.179 90.4

LCS-140109-2 0.198 0.212 107 0.198 0.235 119

LCS-140109-3 0.198 0.229 116 0.198 0.211 106

Average ± %RSD 110% ± 5.0% 105% ± 14%

LCS-140109-4 1.98 2.15 109 1.98 2.47 125

LCS-140109-5 1.98 2.08 105 1.98 2.40 121

LCS-140109-6 1.98 2.08 105 1.98 2.41 122

Average ± %RSD 106% ± 2.2% 123% ± 1.7% (1)

LCS-140109-7 19.9 20.3 102 19.9 21.5 108

LCS-140109-8 19.9 21.1 106 19.9 21.9 110

LCS-140109-9 19.9 22.0 111 19.9 22.6 114

Average ± %RSD 106% ± 4.3% 111% ± 2.8%

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/9/14 PFOS (Linear + Branched) PFOS surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140109-1 0.184 0.224 122 0.189 0.199 105

LCS-140109-2 0.184 0.216 117 0.189 0.207 109

LCS-140109-3 0.184 0.219 119 0.189 0.257 136

Average ± %RSD 119% ± 2.1% 117% ± 14%

LCS-140109-4 1.84 2.11 115 1.89 2.01 106

LCS-140109-5 1.84 2.09 113 1.89 1.95 103

LCS-140109-6 1.84 2.18 119 1.89 2.05 108

Average ± %RSD 116% ± 2.6% 106% ± 2.4% 

LCS-140109-7 18.4 20.6 112

LCS-140109-8 18.4 20.5 112

LCS-140109-9 18.4 21.1 115

Average ± %RSD 113% ± 1.5%

>ULOQ = analyte concentration exceeded upper limit of quantitation

NA = Not Applicable

(1) LCS recovery did not meet acceptance criteria of 100 ± 20%.
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REPORT NO. ISO13-07-11

PAGE 11 OF 25

Table 7 continued. Lab Control Spike Results.

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/10/14 PFOA (Linear + Branched) PFOA surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140110-1 0.190 0.196 103 0.198 0.237 120

LCS-140110-2 0.190 0.194 102 0.198 0.217 109

LCS-140110-3 0.190 0.202 106 0.198 0.249 126

Average ± %RSD 104% ± 2.0% 118% ± 7.3%

LCS-140110-4 1.90 2.18 115 1.98 2.35 119

LCS-140110-5 1.90 2.08 110 1.98 2.23 112

LCS-140110-6 1.90 2.26 119 1.98 2.27 115

Average ± %RSD 115% ± 3.9% 115% ± 3.1%

LCS-140110-7 19.0 21.3 112

LCS-140110-8 19.0 21.2 112

LCS-140110-9 19.0 20.7 109

Average ± %RSD 111% ± 1.6%

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/10/14 PFBS PFHS

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140110-1 0.198 0.201 101 0.198 0.208 105

LCS-140110-2 0.198 0.212 107 0.198 0.213 107

LCS-140110-3 0.198 0.204 103 0.198 0.245 124

Average ± %RSD 104% ± 2.9% 112% ± 9.3%

LCS-140110-4 1.98 2.12 107 1.98 2.21 112

LCS-140110-5 1.98 2.20 111 1.98 2.28 115

LCS-140110-6 1.98 2.25 114 1.98 2.18 110

Average ± %RSD 111% ± 3.2% 112% ± 2.2%

LCS-140110-7 19.9 20.8 104 19.9 22.9 115

LCS-140110-8 19.9 20.6 103 19.9 22.1 111

LCS-140110-9 19.9 20.1 101 19.9 21.2 107

Average ± %RSD 103% ± 1.5% 111% ± 3.6%

>ULOQ = analyte concentration exceeded upper limit of quantitation

NA = Not Applicable

(1) LCS recovery did not meet acceptance criteria of 100 ± 20%.
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Table 7 continued. Lab Control Spike Results.

ETS-8-044.1

Internal Standard 

Calibration

Analyzed 1/10/14 PFOS (Linear + Branched) PFOS surrogate

Lab ID

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

Spiked 

Concentration 

(ng/mL)

Calculated 

Concentration 

(ng/mL) %Recovery

LCS-140110-1 0.184 0.208 113 0.189 0.204 108

LCS-140110-2 0.184 0.222 121 0.189 0.218 115

LCS-140110-3 0.184 0.198 107 0.189 0.197 104

Average ± %RSD 114% ± 6.2% 109% ± 5.1%

LCS-140110-4 1.84 2.26 123 1.89 2.35 125

LCS-140110-5 1.84 2.12 115 1.89 2.18 115

LCS-140110-6 1.84 2.28 124 1.89 2.26 120

Average ± %RSD 121% ± 4.1% (1) 120% ± 4.2% 

LCS-140110-7 18.4 21.1 114

LCS-140110-8 18.4 20.8 113

LCS-140110-9 18.4 19.1 104

Average ± %RSD 110% ± 5.0%

>ULOQ = analyte concentration exceeded upper limit of quantitation

NA = Not Applicable

(1) LCS recovery did not meet acceptance criteria of 100 ± 20%.

3.7 Analytical Method Uncertainty

Analytical uncertainty is based on historical QC data that is control charted and used to evaluate 

method accuracy and precision. The method uncertainty is calculated following ETS-12-012.2. The 

standard deviation is calculated for the set of accuracy results (in %) obtained for the QC samples. The 

expanded uncertainty is calculated by multiplying the standard deviation by a factor of 2, which 

corresponds to a confidence level of 95%. The method uncertainty determined by ETS-12-012.2 was 

±21% for PFHS and ±18% for PFOS, but the method uncertainty has been expanded based on the 

%bias of the non-compliant mid-level LCSs.

Table 8. Analytical Method Uncertainty.

Analyte Calibration Method Standard Deviation (%) Method Uncertainty

PFOA External Standard 8.56 ±17%

PFBS External Standard 8.70 ±17%

PFHS External Standard 7.92 ±16%

PFOS External Standard 10.7 ±21%

PFOA Internal Standard 8.50 ±17%

PFBS Internal Standard 6.80 ±14%

PFHS Internal Standard 10.7 ±23%

PFOS Internal Standard 9.12 ±21%
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3.8 Field Matrix Spikes (FMS)

A field matrix spike was collected at each sampling point to verify that the analytical method is 

applicable to the collected matrix. Field matrix spikes are generated by adding a measured volume of 

field sample to a container spiked by the laboratory with the target analytes prior to shipping sample 

containers for sample collection. Field matrix spike recoveries within method acceptance criteria of 

100±30% confirm that “unknown” components in the sample matrix do not significantly interfere with 

the extraction and analysis of the analytes of interest. The standards used for the preparation of the 

field matrix spiking solutions contained reference materials comprised of both linear and branched 

isomers for PFOA and PFOS. Field matrix spikes are presented in section 4 of this report. 

*100%

Spike Concentraton

(Sample Concentration of FMS Average Concentration:FieldSample & FieldSample Dup.) FMS Recovery − =

Table 9. Field Matrix Spike Concentrations.

Final Concentration (ng/mL)

Location Description PFOA PFBS PFHS PFOS

ACI Field Matrix Spike 2480 2500 2510 2500

ACM2 Field Matrix Spike 4.96 5.00 5.00 4.99

ACE Field Matrix Spike 4.96 5.00 5.00 4.99

WW8R, WW9R, 

WW10R, WW11R Field Matrix Spike 2480 2500 2510 2500

Trip Blank

Low Field Matrix Spike 4.96 5.00 5.00 4.99

High Field Matrix Spike 2480 2500 2510 2500

4 Data Summary and Discussion

The tables below summarize the sample results and field matrix spike recoveries for the seven

locations as well as the Trip Blank. Each table provides the average concentration and the relative 

percent difference (%RPD) of the sample and sample duplicate. Results and average values are 

rounded to three significant figures. Relative percent difference (%RPD) values are rounded to two 

significant figures. Because of rounding, values may vary slightly from those listed in the raw data. 

Field matrix spikes meeting the method acceptance criteria of ±30%, demonstrate that the method is 

appropriate for the given matrix. 

All field matrix spike samples and surrogate recovery standards met method acceptance criteria except 

where noted below.

DAL-GW-ACM2; the FMS sample (5 ng/mL) was not appropriate for PFBS; however, the surrogate 

recovery standard 13C4-PFOS met method acceptance criteria. No additional QC samples were 

prepared. 
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Table 10. DAL GW ACI 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-001 DAL-GW-ACI-0-131213 1840 NA 1330 NA

ISO13-07-11-002 DAL-GW-ACI-DB-131213 1820 NA 1360 NA

ISO13-07-11-003 DAL-GW-ACI-FMS-131213 4200 95.6 3690 93.6

Average Concentration (ng/mL) ± %RPD 1830 ng/mL ± 1.1% 1350 ng/mL ± 2.2%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-001 DAL-GW-ACI-0-131213 687 NA 1960 NA

ISO13-07-11-002 DAL-GW-ACI-DB-131213 703 NA 1980 NA

ISO13-07-11-003 DAL-GW-ACI-FMS-131213 3210 100 4780 112

Average Concentration (ng/mL) ± %RPD 695 ng/mL ± 2.3% 1970 ng/mL ± 1.0% 

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-001 DAL-GW-ACI-0-131213 94.2 110

ISO13-07-11-002 DAL-GW-ACI-DB-131213 93.1 115

ISO13-07-11-003 DAL-GW-ACI-FMS-131213 89.7 110

Average Concentration (ng/mL) ± %RSD 92.3% ± 2.5% 112% ± 2.6%

NA = Not Applicable

(1) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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Table 11. DAL GW ACM2 131213

PFOA (1) PFBS (2)

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-004 DAL-GW-ACM2-0-131213 0.0729 NA 1430 NA

ISO13-07-11-005 DAL-GW-ACM2-DB-131213 0.0775 NA 1440 NA

ISO13-07-11-006 DAL-GW-ACM2-FMS-131213 5.51 110 1460 NC

Average Concentration (ng/mL) ± %RPD 0.0752 ng/mL ± 6.1% 1440 ng/mL ± 0.69%

PFHS (1) PFOS (1)

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-004 DAL-GW-ACM2-0-131213 0.0587 NA 0.531 NA

ISO13-07-11-005 DAL-GW-ACM2-DB-131213 0.0829 NA 0.606 NA

ISO13-07-11-006 DAL-GW-ACM2-FMS-131213 5.47 108 6.00 109

Average Concentration (ng/mL) ± %RPD 0.0708 ng/mL ± 34% (3) 0.569 ng/mL ± 13%

13C4-PFOA (1) 13C4-PFOS (1)

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-004 DAL-GW-ACM2-0-131213 110 102

ISO13-07-11-005 DAL-GW-ACM2-DB-131213 105 93.6

ISO13-07-11-006 DAL-GW-ACM2-FMS-131213 108 88.3

Average Concentration (ng/mL) ± %RSD 108% ± 2.3% 94.6% ± 7.3%

NA = Not Applicable

NC = Not Calculated; Spike level was less than 0.5x the endogenous sample concentration.

(1) Samples were analyzed by internal standard calibration.

(2) Samples were analyzed by external standard calibration.

(3) Sample/sample duplicate RPD did not meet acceptance criteria of ≤20%. 
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Table 12. DAL GW ACE 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-007 DAL-GW-ACE-0-131213 0.0728 NA 0.0725 NA

ISO13-07-11-008 DAL-GW-ACE-DB-131213 0.0868 NA 0.0806 NA

ISO13-07-11-009 DAL-GW-ACE-FMS-131213 5.22 104 4.65 91.5

Average Concentration (ng/mL) ± %RPD 0.0798 ng/mL ± 18% 0.0766 ng/mL ± 11%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-007 DAL-GW-ACE-0-131213 <0.0500 NA 0.0276 NA

ISO13-07-11-008 DAL-GW-ACE-DB-131213 0.0648 NA 0.0330 NA

ISO13-07-11-009 DAL-GW-ACE-FMS-131213 4.72 93.1 4.75 94.6

Average Concentration (ng/mL) ± %RPD 0.0648 ng/mL 0.0303 ng/mL ± 18%

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-007 DAL-GW-ACE-0-131213 98.5 112

ISO13-07-11-008 DAL-GW-ACE-DB-131213 102 91.7

ISO13-07-11-009 DAL-GW-ACE-FMS-131213 104 94.1

Average Concentration (ng/mL) ± %RSD 100% ± 2.8% 102% ± 11%

NA = Not Applicable

(1) Samples were analyzed by internal standard calibration.
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Table 13. DAL GW WW8R 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-010 DAL-GW-WW8R-0-131213 2700 NA 316 NA

ISO13-07-11-011 DAL-GW-WW8R-DB-131213 2730 NA 316 NA

ISO13-07-11-012 DAL-GW-WW8R-FMS-131213 4930 89.1 2640 93.0

Average Concentration (ng/mL) ± %RPD 2720 ng/mL ± 1.1% 316 ng/mL ± 0.0%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-010 DAL-GW-WW8R-0-131213 1260 NA 4070 NA

ISO13-07-11-011 DAL-GW-WW8R-DB-131213 1270 NA 4050 NA

ISO13-07-11-012 DAL-GW-WW8R-FMS-131213 3610 93.2 6490 97.2

Average Concentration (ng/mL) ± %RPD 1270 ng/mL ± 0.79% 4060 ng/mL ± 0.49%

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-010 DAL-GW-WW8R-0-131213 90.6 108

ISO13-07-11-011 DAL-GW-WW8R-DB-131213 86.5 107

ISO13-07-11-012 DAL-GW-WW8R-FMS-131213 82.7 101

Average Concentration (ng/mL) ± %RSD 86.6% ± 4.6% 105% ± 3.6%

NA = Not Applicable

(1) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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Table 14. DAL GW WW9R 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-013 DAL-GW-WW9R-0-131213 2670 NA 264 NA

ISO13-07-11-014 DAL-GW-WW9R-DB-131213 2700 NA 253 NA

ISO13-07-11-015 DAL-GW-WW9R-FMS-131213 4820 85.9 2590 93.2

Average Concentration (ng/mL) ± %RPD 2690 ng/mL ± 1.1% 259 ng/mL ± 4.2%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-013 DAL-GW-WW9R-0-131213 1170 NA 4160 NA

ISO13-07-11-014 DAL-GW-WW9R-DB-131213 1160 NA 4210 NA

ISO13-07-11-015 DAL-GW-WW9R-FMS-131213 3460 91.2 6640 98.0

Average Concentration (ng/mL) ± %RPD 1170 ng/mL ± 0.85% 4190 ng/mL ± 1.2%

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-013 DAL-GW-WW9R-0-131213 88.3 111

ISO13-07-11-014 DAL-GW-WW9R-DB-131213 89.6 105

ISO13-07-11-015 DAL-GW-WW9R-FMS-131213 85.5 106

Average Concentration (ng/mL) ± %RSD 87.8% ± 2.4% 107% ± 3.0%

NA = Not Applicable

(1) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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Table 15. DAL GW WW10R 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-016 DAL-GW-WW10R-0-131213 1910 NA 239 NA

ISO13-07-11-017 DAL-GW-WW10R-DB-131213 1870 NA 238 NA

ISO13-07-11-018 DAL-GW-WW10R-FMS-131213 3940 82.7 2460 88.8

Average Concentration (ng/mL) ± %RPD 1890 ng/mL ± 2.1% 239 ng/mL ± 0.42%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-016 DAL-GW-WW10R-0-131213 889 NA 2950 NA

ISO13-07-11-017 DAL-GW-WW10R-DB-131213 880 NA 2890 NA

ISO13-07-11-018 DAL-GW-WW10R-FMS-131213 3110 88.6 5110 87.6

Average Concentration (ng/mL) ± %RPD 885 ng/mL ± 1.0% 2920 ng/mL ± 2.1%

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-016 DAL-GW-WW10R-0-131213 90.3 109

ISO13-07-11-017 DAL-GW-WW10R-DB-131213 86.8 102

ISO13-07-11-018 DAL-GW-WW10R-FMS-131213 84.2 111

Average Concentration (ng/mL) ± %RSD 87.1% ± 3.5% 107% ± 4.4%

NA = Not Applicable

(1) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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Table 16. DAL GW WW11R 131213 (1)

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-019 DAL-GW-WW11R-0-131213 1050 NA 200 NA

ISO13-07-11-020 DAL-GW-WW11R-DB-131213 1060 NA 195 NA

ISO13-07-11-021 DAL-GW-WW11R-FMS-131213 3260 88.7 2420 88.9

Average Concentration (ng/mL) ± %RPD 1060 ng/mL ± 0.94% 198 ng/mL ± 2.5%

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-019 DAL-GW-WW11R-0-131213 515 NA 1570 NA

ISO13-07-11-020 DAL-GW-WW11R-DB-131213 508 NA 1560 NA

ISO13-07-11-021 DAL-GW-WW11R-FMS-131213 2730 88.4 3940 94.8

Average Concentration (ng/mL) ± %RPD 512 ng/mL ± 1.4% 1570 ng/mL ± 0.64%

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-019 DAL-GW-WW11R-0-131213 91.7 108

ISO13-07-11-020 DAL-GW-WW11R-DB-131213 90.0 110

ISO13-07-11-021 DAL-GW-WW11R-FMS-131213 84.7 104

Average Concentration (ng/mL) ± %RSD 88.8% ± 4.1% 107% ± 2.9%

NA = Not Applicable

(1) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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Table 17. Trip Blank Results

PFOA PFBS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-022 DAL-GW-TRIP-0-131213 <0.0240 (1) NA <0.0250 (1) NA

ISO13-07-11-023 DAL-GW-TRIP-LS-131213 4.37 (2) 88.1 4.74 (2) 94.8

ISO13-07-11-024 DAL-GW-TRIP-HS-131213 2200 (2) 88.7 2110 (2) 84.4

PFHS PFOS

3M LIMS ID Description

Concentration 

(ng/mL) %Recovery

Concentration 

(ng/mL) %Recovery

ISO13-07-11-022 DAL-GW-TRIP-0-131213 <0.0500 (1) NA <0.0232 (1) NA

ISO13-07-11-023 DAL-GW-TRIP-LS-131213 4.45 (2) 89.0 4.54 (2) 91.0

ISO13-07-11-024 DAL-GW-TRIP-HS-131213 2160 (2) 86.1 2420 (2) 96.8

13C4-PFOA 13C4-PFOS

3M LIMS ID Description %Recovery %Recovery

ISO13-07-11-022 DAL-GW-TRIP-0-131213 115 (1) 92.0 (1)

ISO13-07-11-023 DAL-GW-TRIP-LS-131213 100 (2) 114 (2)

ISO13-07-11-024 DAL-GW-TRIP-HS-131213 94.0 (2) 115 (2)

NA = Not Applicable

(1) Samples were analyzed by internal standard calibration.

(2) Samples were analyzed by external standard calibration. The surrogate recovery standards 13C4-PFOA and 13C4-PFOS were 

added to the samples during sample preparation.
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5 Conclusion

Laboratory control spikes were used to determine the analytical method accuracy and precision for all 

analytes. The accuracy and precision were then used to estimate the method uncertainty for the 

results. Field matrix spike recoveries demonstrated that the analytical method was appropriate for the 

given sample matrix. Analysis was completed using 3M Environmental Laboratory Method ETS-8-

044.1 “Method of Analysis for the Determination of Perfluorinated Compounds in Water by LC/MS/MS; 

Direct Injection Analysis”. Analytical results are reported in Table 1 and 10-17 of this report.

6 Data / Sample Retention

All remaining sample and associated project data (hardcopy and electronic) will be archived according 

to 3M Environmental Laboratory standard operating procedures.

7 Attachments

Attachment A: Analyte Trend Data for select sampling points at the Decatur Ground Water Treatment 

Plant (GWTP) GAC System.

8 Signatures

Susan T. Wolf, 3M Principal Analytical Investigator Date

William K. Reagen, Ph.D., 3M Environmental Laboratory Technical Director Date

The 3M Environmental Laboratory’s Quality Assurance Unit has audited the data and report for this 

project.

Quality Assurance Representative Date

This test report shall not be reproduced except in full, without written approval of the 3M 

Environmental Laboratory.
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Attachment A: Analyte Trend Data for select sampling points at the Decatur Ground Water Treatment 

Plant (GWTP) GAC System 

ACI (Activated Carbon Influent) - Sample Results in ng/mL

ACI 1/17/13 2/13/13 3/27/13 4/29/13 5/31/13 6/27/13 7/23/13 9/30/13 10/28/13 11/18/13 12/13/13

PFOA 1910 2300 2220 1480 1860 1480 1630 2320 1880 2190 1830

PFBS 588 830 1060 1360 1040 708 1230 356 1590 1100 1350

PFHS 895 1580 1090 777 940 942 749 1400 866 1330 695

PFOS 1810 2940 2490 1670 2150 1590 1680 3240 2100 2240 1970

ACE (Activated Carbon Effluent) - Sample Results in ng/mL

ACE 1/17/13 2/13/13 3/27/13 4/29/13 5/31/13 6/27/13 7/23/13 9/30/13 10/28/13 11/18/13 12/13/13

PFOA <0.0240 0.124 0.0380 0.0422 0.0725 0.0717 0.0641 0.115 0.231 0.478 0.0798

PFBS <0.0250 0.0360 <0.0250 0.392 24.8 111 1960 1950 0.379 0.592 0.0766

PFHS <0.0250 0.178 0.0477 0.0570 0.105 0.118 0.0778 0.156 0.180 0.366 0.0648

PFOS <0.0232 0.0329 <0.0232 <0.0232 <0.0232 <0.0232 0.0277 0.0452 0.0785 0.0726 0.0303
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Attachment A: Analyte Trend Data for select sampling points at the Decatur Ground Water Treatment 

Plant (GWTP) GAC System 

WW8R - Sample Results in ng/mL

WW8R 1/17/13 2/13/13 3/27/13 4/29/13 5/31/13 6/27/13 7/23/13 9/30/13 10/28/13 11/18/13 12/13/13

PFOA 4350 3250 3640 3190 2760 2760 2640 2890 2830 3040 2720

PFBS 410 354 385 364 289 282 263 303 312 362 316

PFHS 1930 1900 1760 1610 1330 1340 1260 1370 1300 1440 1270

PFOS 5710 4850 5120 4830 4180 4110 3910 4100 4410 4750 4060

WW9R - Sample Results in ng/mL

WW9R 1/17/13 2/13/13 3/27/13 4/29/13 5/31/13 6/27/13 7/23/13 9/30/13 10/28/13 11/18/13 12/13/13

PFOA 2710 2850 3330 2650 2660 2630 2410 2730 2820 2950 2690

PFBS 184 236 278 244 226 225 212 249 286 305 259

PFHS 954 1400 1440 1200 1120 1140 1030 1220 1280 1340 1170

PFOS 3690 4100 4660 4340 4210 4150 3670 4200 4380 4540 4190
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Attachment A: Analyte Trend Data for select sampling points at the Decatur Ground Water Treatment 

Plant (GWTP) GAC System 

WW10R - Sample Results in ng/mL

WW10R 9/30/2013 10/28/2013 11/18/2013 12/13/2013

PFOA 2070 2150 2400 1890

PFBS 247 264 303 239

PFHS 1030 1030 1120 885

PFOS 2770 3160 3890 2920

WW11R - Sample Results in ng/mL

WW11R 9/30/2013 10/28/2013 11/18/2013 12/13/2013

PFOA 1720 1100 1320 1060

PFBS 299 240 287 198

PFHS 1000 511 680 512

PFOS 2200 1670 1850 1570