NC0047384_Sampling of T.Z. Osborne_20191022

City of Greensboro
North Carolina Water Resources Department
October 22, 2019 [Certified Mail Return Receipt 7015 0640 0006 7211 3599]
North Carolina Department of Environmental Quality RECEIVED
Division of Water Resources— NPDES/Pretreatment Section NOV 0 4 2019
1617 Mail Service Center
Raleigh NC 27699-1617 NCDEO/OWTORDES
RE: DEQ Administrative Letter of 4-30-2019 Requiring Sampling of T. Z. Osborne (TZO)
WWTP Influent for PFAS compounds and 1,4-dioxane
To Whom It May Concern:
Attached please find spreadsheets/data requested in the DEQ letter of April 30, 2019. As
outlined in the DEQ letter, three T. Z. Osborne WWTP influent samples were collected on the
following dates for analysis of 21 PFAS compounds: July 8, August 7, and September 17.
Please note the following:
• An October 2017 DEQ Administrative Letter required the City of Greensboro to conduct
monthly T. Z. Osborne effluent sampling and reporting for 1,4-dioxane beginning in
December 2017. As required, this data is reported to DEQ on the monthly eDMR. Thus,
no influent dioxane monitoring was conducted. This waiver was discussed with Julie
Grzyb of the DEQ NPDES Section.
• The July and August TZO influent samples were split between two commercial
laboratories and the September TZO influent sample was split between three
commercial laboratories. The influent sample result recorded for each month on the
DEQ-provided spreadsheet was the average of all values that met QA/QC.
— Greensboro developed a separate spreadsheet to record/submit data from all
three laboratories.
• No J values were included on the spreadsheets.
• Below Detection Limit (BDL) Values were reported as follows:
— For reporting purposes, BDL values were reported as "ND" with a "U" qualifier in
the appropriate column.
— For averaging purposes, BDL values were designated as "0".
• An internal Pace Lab miscommunication and different analytical methods resulted in
Pace Laboratories in Minnesota not conducting analysis for 4 of the 21 DEQ requested
compounds:
— PFHpS (375-92-8), PFNS (68259-12-1), PFOSA (754-91-6), PFPeS (2706-91-4)
— However, Pace reported 4 analytes not requested: NaDONA (958445-44-8),
PFPrOPrA (13252-13-6), PFHxDA (67905-19-5), PFODA (16517-11-6)

- It should be noted that none of the 4 compounds omitted by Pace were detected
in any of the 3 monthly samples by the other laboratories.
• Because Greensboro split samples, we have multiple large reports, so only the specific
sample data summary sheets have been submitted. Other information (QA/QC data,
blanks, etc.) is on file and available for inspection.
There is currently no EPA approved laboratory analytical method for the determination of PFAS
compounds in wastewater. Please note the following on the City of Greensboro detailed
spreadsheet including analytical results from all laboratories:
• Split sample results for several of the compounds do not meet acceptable QA/QC
criteria for duplicate analyses
• For several compounds, one lab detected the compound in the sample while one or
both of the other labs did not.
• Any conclusions based on the data set for this Special Study must include rigorous data
review and validation, as well as recognition of the difficulty in accurately and precisely
measuring nanogram per liter (ng/l) values in a complex wastewater matrix.
The following is a summary of T. Z. Osborne WWTP influent PFOS/PFOA and Total PFAS values:
DEQ PFAS Study Results 7/8/2019 8/7/2019 9/17/2019
Sum of PFOA and PFOS (ng/l) 36.7 60.8 61.9
Total PFAS (ng/l) 107.7 290.6 161.4
If you have questions or need additional information, do not hesitate to contact me by email at
[e-mail] or by phone at 336-433-7229.
Sincerely,
J Crl _
Martie Groome
Laboratory and Industrial Waste Section Supervisor
cc: Steve Drew, Greensboro Water Resources Director(via email w/o lab data sheets)
Mike Borchers, Greensboro Assistant Water Resources Director(via email w/o lab data sheets)
Elijah Williams, Greensboro Water Reclamation Manager (via email w/o lab data sheets)
Bradley Flynt, Greensboro Plant Superintendent-ORC (via email w/o lab data sheets)
Alicia Goots, Greensboro Laboratory Coordinator(via email w/o lab data sheets)
Frank Skee, Greensboro Pretreatment Coordinator(via email w/o lab data sheets)
William Burdick, Greensboro Pretreatment Compliance Specialist (via email w/o lab data sheets)
Jenny Graznak, DEQ Winston-Sale Regional Office Assistant Director(via email w/o lab data sheets)
Julie Grzyb, DEQ NPDES Permitting Supervisor (via email w/o lab data sheets)
Glenn Dunn, Esq., Poyner and Spruill (via email w/o lab data sheets)

Emerging Compounds DEQ Study Data
STATE PFAS STUDY City of Greensboro T. Z. Osborne POTW NC0047384
POTW Name: ( T.Z.Osborne Water Reclamation Facility I NPDES#: I NC0047384 July August September
Influent Grab(ng/L) Enthalpy Pace Two-way splitEnthalpy Pace Two-wayspllt Enthalpy Pace Shealy -waysplt
CAS Number Analyte Name Acronym 7/8/2019 * 8/7/2019 _* 9/17/2019 * 7/8/2019 AVG 8/7/2019 AVG 9/17/2019 AVG
335-67-1 Perfluorooctanoic acid PFOA 11.2 24.7 14.9 PFOA 12.4 9.9 11.2 29.3 20.0 24.7 11.6 10.0 23.0 14.9
1763-23-1 Perfluorooctanesulfonic acid PFOS 25.6 36.2 47.1 PFOS 27.1 24.0 25.6 39.3 33.0 36.2 34.2 33.0 74.0 47.1
375-22-4 Perfluorobutanoic acid PFBA 3.1 27.3 13.0 PFBA ND 6.1 3.1 29.5 25.0 27.3 ND 12.0 27.0 13.0
375-73-5 Perfluorobutanesulfonic acid PFBS 2.5 39.3 _ 25.0 PFBS ND 4.9 2.5 47.6 31.0 39.3 ND 58.0 17.0 25.0
335-77-3 Perfluorodecanesulfonic acid PFDS ND U ND U ND U PFDS ND ND ND ND ND ND ND ND ND ND
•
335-76-2 Perfluorodecanoic acid PFDA 2.9 ND U 0.8 PFDA 3.6 2.2 2.9 ND ND ND 2.3 ND ND 0.8
307-55-1 Perfluorododecanoic acid PFDoA ND U ND U ND U PFDoA ND ND ND ND ND ND ND ND ND ND
375-92-8 Perfluoroheptanesulfonic acid PFHpS ND U ND U ND U PFHpS ND NR ND ND NR ND ND NR ND ND
375-85-9 Perfluoroheptanoic acid PFHpA 6.5 22.3 7.4 PFHpA 7.2 5.9 6.5 22.5 22.0 22.3 7.2 ND 15.0 7.4
355-46-4 Perfluorohexanesulfonic acid PFHxS 9.4 19.6 15.3 PFHxS 11.3 7.5 9.4 22.2 17.0 19.6 10.9 11.0 24.0 15.3
307-24-4 Perfluorohexanoic acid PFHxA 24.7 54.6 _ 18.0 PEA 27.3 22.0 24.7 71.1 38.0 54.6 ND ND 54.0 18.0
68259-12-1 Perfluorononanesulfonic acid PFNS ND U ND U ND U PENS ND NR ND ND NR ND ND NR ND ND
375-95-1 Perfluorononanoic acid PFNA ND U ND U ND U PFNA ND ND ND ND ND ND ND ND ND ND
754-91-6 Perfluorooctanesulfonamide PFOSA ND U ND U ND U PFOSA ND NR ND ND NR ND ND NR ND ND
2991-50-6 2-(N-Ethylperfluorooctanesulfonamido)acetic acid N-EtFOSAA 4 ND U ND U ND U N-EtFOSAA ND ND ND ND ND ND ND ND ND ND
1
2355-31-9 2-(N-Methylperfluorooctanesulfonamido)acetic acid N-MeFOSAA ND U ND U ND U N-MrFOSAA ND ND ND ND ND ND ND ND ND ND
2706-91-4 Perfluoropentanesulfonic acid PFPeS ND U ND U ND U PFPeS ND NR ND ND NR ND ND NR ND ND
2706-90-3 Perfluoropentanoic acid PFPeA 22.0 _ 66.9 20.0 PFNA 30.0 14.0 22.0 88.7 45.0 66.9 ND 18 42 20
376-06-7 Perfluorotetradecanoic acid PFTeA ND U ND U ND U PFTeA ND ND ND ND ND ND ND ND ND ND
' 72629-94-8 Perfluorotridecanoic acid PFTriA ND U_ ND U ND U PFTriANDND ND ND ND ND ND NDND ND
2058-94-8 Perfluoroundecanoic acid PFUnA ND U ND U ND U PFUeA ND ND ND _ ND ND ND ND ND ND ND
ENTER OTHER PARAMETERS TESTED
ENTER OTHER PARAMETERS TESTED _
ENTER OTHER PARAMETERS TESTED
ENTER OTHER PARAMETERS TESTED
ENTER OTHER PARAMETERS TESTED
Sum of PFOA and PFOS 36.7 60.8 61.9 iViiiiiii 39.5 33.9 36.7 68.6 53.0 60.8 45.8 43.0 97.0 61.9
Total 107.7 290.6 161.4 118.9 96.5 107.7 350.2 231.0 290.6 66.2 142.0 276.0 161.4
EFFLUENT Grab(ug/L) - No'J' values were reported Split numbers that were statistically far apart(in red)
7/8/2019 * Monthly Avg(3 samples) * 9/17/2019 • NR=Not Run ND=Not Detected U=Analyte Not Detected
1,4-Dioxane on effluent eDMR _ on effluent eDMR on effluent eDMR All twenty-one(21) analytes were analyzed every month by Enthalpy&Shealy labs.
eDMR Effluent Grab(ug/I)
*Please enter applicable lab qualifiers 9.73 468.2 5.98 PACE did not analyze for PFNS,PFOSA,PFHpS or PFPeS at all because analysis is by a separate QSm isotope dilution-
and was not run.None of the labs showed detections for these four PACE missed analyzes therefore we are confident
including all of the PACE PFAS data.

; EN .12HALI'Y
_ .1 N \ I '1 T 1 C- \ 1
XXl-DEQ Detailed Results-PFAS
Client Details
Client Sample ID: XXI-DEQ Client Name: City of Greensboro
Client Project ID: July PFAS Sample Collection Date: 08-Jul-19
Lab/Sample Details
Lab lob#: 0719-717 Matrix: Aqueous Date Received: 08-Jul-19
Lab Sample ID: 0719-717_10383_001 Wt./Vol. 35.2 Date Extracted: 24-Jul-19
QC Batch#: 10383 Date Analyzed: 25-Jul-19
Final Volume(mL) 0.4 Time Analyzed: 2232:19
Analyte I CAS Number Conc.(ng/L) I MDL(ng/L) RL(ng/L) _ Qualifiers Standard ES Recoveries(%) Qualifiers
Acids MPFBA 86.3
PFBA 375-22-4 ND 1.12 2.56 U M5PFPeA 66.4
PFPeA 2706-90-3 30.0 0.638 2.56 M3PFBS 147
PFHxA 307-24-4 27 3 1.12 256 B M2-4:2 FTS 255 Q
PFHpA 375-85-9 7.19 0.494 2.56 M5PFHxA 79.4
PFOA 335-67-1 12 4 0.564 2.56 M3HFPO-DA 107
PFNA 375-95-1 ND 0.362 2.56 _ U M4PFHpA 91.9
PFDA 335-76-2 3 59 0.888 256 M3PFHxS 94.3
PFUnA 2058-94-8 ND 0.342 2.56 U M2-6:2 FTS 218 Q
PFDoDA 307-55-1 ND 0.337 2.56 U M8PFOA 88.2
PFTrDA 72629-94-8 ND 0.529 2.56 _ U M9PFNA 81.7
PFTeDA 376-06-7 ND 0.590 256 U M8PFOS 84.3
M2-8:2 FTS 46.4 Q
Sulfonates MBFOSA-I 37.1 Q
L-PFBS 375-73-5 ND 0.590 2.56 U M6PFDA 74.4
PFPeS 2706-91-4 ND 0.703 2.56 U d3-N-McFOSAA 16.5 Q
PFHxS 355-46-4 11 3 0.588 2.56 ds-N-EtFOSAA 41.0 Q I
PFHpS 375-92-8 ND 0.553 2.56 U M7PFUdA 52.7
PFOS 1763-23-1 271 0.335 _ 2.56 MPFDoA 32.9 Q#s
PFNS 68259-12-1 ND 0.465 2.56 U M2PFTeDA 23.9 Q
PFDS 335-77-3 ND 0.959 256 U
Other
PFOSA 754-91-6 ND 2.59 2.56 U
N-McFOSAA 2355-31-9 ND 0.386 2.56 U
N-EtFOSAA 2991-50-6 ND 0.462 2.56 U
EU#0719-717R2 6 of 27

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A N A l y 'I- I C- A l
XXT-DEQ Detailed Results-PFAS_
Client Details
Client Sample ID: XXT-DEQ Client Name: Meritech-Greensboro
Client Project ID: August PFAS Sample Collection Date: 07-Aug-19
Lab/Sample Details _
Lab Job#: 0819-716 Matrix: Aqueous Date Received: 09-Aug-19
Lab Sample ID: 0819-716_10416_001 Wt./Vol. 35.4 Date Extracted: 19-Aug-19
QC Batch#: 10416 Date Analyzed: 29-Aug-19
Final Volume(mL) 0.4
Time Analyzed: 1:08:07
Analyte CAS Number Conc.(ng/L) MDL( g/)
n L RL(ng/L) Qualifiers Standard ES Recoveries
Acids - I ) Qualifiers
MPFBA 67.9
PFBA 375-22-4 29.5 1.11 10.2 M5PFPeA 125
PFPeA 2706-90-3 88,7 0.635 10.2 M3PFBS -
155 Q
PFHxA
307-24-4 71.1 1.11 10.2 MSPFHxA 33.5 Q
PFHpA . 375-85-9 22.5 0.491 10.2 M4PFHpA 68.0
PFOA 335-67-1 29.3 0.562 10.2 _ M3PFHx5
84.1
PFNA 375-95-1 ND 0.360 10.2 U M8PFOA
70.4
PFDA 335-76-2 ND 0.884 10.2 U M9PFNA
45.0 q
PFUnA 2058-94-8 ND 0.340 10.2 _ U M8PFOS
63.9
PFDoDA 307-55-1 ND 0.336 10.2 U MSFOSA
30
Q
PFTrDA 72629-94-8 ND 0.527 . 10.2 U M6PFDA
58.6
PFTeDA 376-06-7 ND 0.587 10.2 U d3-N-McFOSAA
12.9 Q
Sulfonates d5-N-EtFOSAA 9.80 Q
M7PFUdA 25.5 a
1 L-PFBS 375-73-5 47.6
0.587 10.2 MPFDoA
PFPeS 18.2 Q
2706-91-4 ND 0.700 _ 10.2 U M2PFTeDA 18.2 q
PFHxS 355-46-4 22.2 0.585 10.2
PFHpS 375-92-8 ND 0.551 10.2 U -
PFOS 1763-23-1 39.3
0.333 10.2
PFNS 68259-12-1 ND 0.462 10.2 U
PFDS 335-77-3 ND 0.954 10.2 U
Other
PFOSA 754-91-6 ND 2.58 10.2 U
N-McFOSAA 2355-31-9 ND 0.385 10.2 U
N-EtFOSAA 2991-50-6 ND 0.460 10.2 U
EU#0819-716 R1 6 of 28

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XXI-DEQ PFAS Detailed Results-PFAS
Client Details
Client Sample ID: XXI-DEQ PFAS Client Name: Meritech Greensboro
Client Project ID: n/a je_p a+t / ?AS Sample Collection Date: 17-Sep-19
Lab/Sample Details f
Lab Job#: 0919-745 Matrix: Aqueous Date Received: 20-Sep-19
Lab Sample ID: 0919-745_10477 OO1R Wt./Vol. 35.5 Date Extracted: 30-Sep-19
QC Batch#: 10477 Date Analyzed: 01-Oct-19
Final Volume(mL) 0.4 Time Analyzed: 17:12:06
Analyte CAS Number Conc.(ng/L) MDL(ng/L) RL(ng/L) Qualifiers Standard ES Recoveries(%) Qualifiers
Acids MPFBA 34.3 Q
P FBA 375-22-4 ND 1.11 1.70 U M5PFPeA _ 5.90 Q
PFPeA 2706-90-3 ND _ 0.632 - 1.70 _ U M3PFBS 14.3 Q
PFHxA 307-24-4 ND 1.11 1.70 U M2-4:2 FTS NR
PFHpA 375-85-9 7.20 0.489 1.70 MSPFHxA 0.500 Q -
PFOA 335-67-1 11.6 0.559 1.70 M3HFPO-DA NR _
PFNA 375-95-1 ND _ 0.358 1.70 U M4PFHpA 83.4
PFDA 335-76-2 2.26 0.880 1.70 M3PFHxS 113
PFUnA 2058-94-8 ND 0.338 1.70 U M2-6:2 FTS NR
PFDoDA 307-55-1 ND 0.334 1.70 U M8PFOA 100
PFTrDA 72629-94-8 ND _ 0.524 1.70 U M9PFNA 91.7
PFTeDA 376-06-7 ND 0.584 1.70 U M8PFOS 91.8
M2-8:2 ITS NR
Sulfonates M8FOSA 5.80 Q
L-PFBS 375-73-5 ND 0.584 1.70 U M6PFDA 76.9
PFPeS 2706-91-4 ND 0.697 1.70 _ U d3-N-McFOSAA 19.1 Q
PFHxS 355-46-4 10.9 0.582 1.70 d5-N-EtFOSAA 29.8 0 _
PFHpS 375-92-8 ND 0.548 1.70 U M7PFUdA 74.8 _
P105 1763-23-1 34.2 0.331 1.70 MPFDoA 75.0
PENS 68259-12-1 ND 0.460 1.70 U M2PFTeDA 31.8 Q
PFDS 335-77-3 ND 0.950 1.70 U
Other
PFOSA 754-91-6 ND - 2.57 2.57 _ U
N-McFOSAA 2355-31-9 ND _ 0.383 1.70 U
N-EtFOSAA 2991-50-6 ND 0.458 1.70 U
EU#0919-745 Page 6 of 21

Pace Analytical Services, LLC
1700 Elm Street, Suite 200
....41: ri n Iln c f Minneapolis, MN 55414
{ [phone]
Method 537 (Modified)
1 Sample Analysis Summary
Client's Sample ID XXI-DEQ- PFAS Date Extracted 07/23/2019
Lab Sample ID 92436071001 Total Amount Extracted 246 mL
Filename A190725A_050 ICAL ID 190724A03
Matrix Non_ ' i Potable_Wat / , Starting CCal A190725A 043
Collected 07/08/2019 Ending CCal Al 90725A 053
Received 07/12/2019 Method Blank Filename A190725A 029
Compound Concentration PQL MDL Dilution Analyzed CAS No. Qual.
(ng/L) (ng/L) (ng/L)
PFBA 6.1 2.0 0.74 1 07/25/201918:26 375-22-4 N2
PFPeA 14 2.0 0.40 1 07/25/201918:26 2706-90-3 N2
PFBS 4.9. 1.8 0.27 1 07/25/201918:26 375-73-5 N2
PFHxA 22 2.0 0.27 1 07/25/201918:26 307-24-4 N2
PFHpA 5.9 2.0 0.63 1 07/25/201918:26 375-85-9 N2
PFHxS 7.5 1.9 0.66 1 07/25/201918:26 355-46-4 N2
PFOA 9.9 - 2.0 0.45 1 07/25/201918:26 335-67-1 N2
PFNA ND D 4.1 1.0 2 07/26/201912:24 375-95-1 N2
PF0*; 24 D 3.9 1.3 2 07/26/201912:24 1763-23-1 N2
PFDA 2.2 2.0 0.49 1 07/25/201918:26 335-76-2 N2
PFUdA ND 2.0 0.47 1 07/25/201918:26 2058-94-8 N2
1eFOSAA ND 4.1 1.3 1 07/25/201918:26 2355-31-9 N2
.-ctFOSAA ND 4.1 1.1 1 07/25/201918:26 2991-50-6 N2
PFDS ND 2.0 0.37 1 07/25/201918:26 335-77-3 N2
PFDoA ND 2.0 0.40 1 07/25/201918:26 307-55-1 N2
PFTrDA ND 2.0 0.37 1 07/25/201918:26 72629-94-8 N2
1 PFTeDA ND 2.0 0.36 1 07/25/201918:26 376-06-7 N2
Surrogate Standards
SS Compound Spiked Found %Recovery Limits Pass/Fail
13C2_PFHxA 2.0 2.2 110 70- 130 Pass
13C2_PFDA 2.0 2.0 98 70- 130 Pass
d5-EtFOSAA 8.0 10 128 70- 130 Pass
Internal Standards 1
IS Compound Area Ical Limits CCV Limits Pass/Fail
13C2_PFOA 564613 343665- 1030996 474032- 948063 Pass
13C4_PFOS 1456825 948972- 2846917 1226752- 2453504 Pass
d3-MeFOSAA 421265 205276- 615829 297996- 595992 Pass
50-150%of cal area
70-140%of the preceding CCV area
N2=The lab does not hold NELAC/TNI accreditation for this parameter but other accreditations/certifications may apply.A complete list of
accreditations/certifications is available upon request.
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Pace Analytical Servi,
ar
1700 Elm Street, SL
+ nal lira J Minneapolis, MN
Method 537 (Modified)
j Sample Analysis Summary
Client's Sample ID XXI-DEQ Date Extracted 08/19/2019
Lab Sample ID 92440652001-R2 Total Amount Extracted 56 mL
Filename A190820A_021 ICAL ID 190813A03
Matrix Industrial Wate ,' , Starting CCal A190820A 011
Collected 08/07/2019 , ., Ending CCal A190820A 022
Received 08/10/2019 Method Blank Filename A190820A 012
Compound Concentration ng/L) (PgQ/LL> (9/L) Dilution Analyzed CAS No. Qual.
PFBA 25 8.9 3.2 1 08/20/201913:08 375-22-4
PFPeA 45 8.9 1.7 1 08/20/201913:08 2706-90-3
PFBS 31 7.8 1.2 1 08/20/201913:08 375-73-5
PFHxA 38 8.9 1.2 1 08/20/201913:08 307-24-4
PFHpA 22 8.9 2.8 1 08/20/201913:08 375-85-9
PFHxS 17 8.4 2.9 1 08/20/201913:08 355-46-4
PFOA 20 8.9 2.0 1 08/20/201913:08 335-67-1
PFNA ND 8.9 2.3 1 08/20/201913:08 375-95-1
PFQS 33 8.6 2.8 1 08/20/201913:08 1763-23-1
PFDA ND 8.9 2.2 1 08/20/201913:08 335-76-2
PFUdA ND 8.9 2.1 1 08/20/201913:08 2058-94-8
VIeFOSAA ND 18 5.7 1 08/20/201913:08 2355-31-9
ll-EtFOSAA ND 18 4.9 1 08/20/201913:08 2991-50-6
PFDS ND 8.6 1.6 1 08/20/201913:08 335-77-3
PFDoA ND 8.9 1.8 1 08/20/201913:08 307-55-1
PFTrDA ND 8.9 1.6 1 08/20/201913:08 72629-94-8
PFTeDA ND 8.9 1.6 1 08/20/201913:08 376-06-7
Surrogate Standards
SS Compound Spiked Found %Recovery Limits Pass/Fail
13C2 PFHxA 2.0 1.7 87 70-130 Pass
13C2 PFDA 2.0 1.5 76 70-130 Pass
d5-EtFOSAA 8.0 6.6 82 70-130 Pass
Internal Standards
IS Compound Area Ical Limits CCV Limits Pass/Fail
13C2_PFOA 535735 368694- 1106082 485216- 970431 Pass
13C4_PFOS 1603593 991415- 2974245 1375946- 2751892 Pass
d3-MeFOSAA 810629 329558- 988675 523664- 1047329 Pass
50-150%of Ical area
70-140%of the preceding CCV area
Report No 10486880 PFAA R1 DFR Revision 1 Page 10 of 19

•
•
Pace Analytical Services, LLC
0 1700 Elm Street, Suite 200
Minneapolis, MN 55414
7caceAnalytical [phone]
Method 537 (Modified)
1 Sample Analysis Summary
Client's Sample ID XXI13-17-19 Date Extracted 10/01/2019
Lab Sample ID 92445897001-R Total Amount Extracted 67 mL
Filename A191002A 028 ICAL ID 191001A03
Matrix Water Starting CCa! A191002A 027
Collected 09/17/2019 Sef,I-eMber- Ending CCal A191002A 031
Received 09/18/2019 Method Blank Filename A19100413 031
Compound Concentration (PgQL) (i419 L) Dilution Analyzed CAS No. Qual.
(ng/L) LnL
PFBA 12 7.4 2.7 1 10/02/201916:43 375-22-4
PFPeA 18 7.4 1.4 1 10/02/201916:43 2706-90-3
PFBS 58• 6.6 0.99 1 10/02/201916:43 375-73-5
PFHxA ND 7.4 1.0 1 10/02/201916:43 307-24-4
PFPrOPrA 27 15 2.7 1 10/02/201916:43 13252-13-6
PFHpA ND 7.4 2.3 1 10/02/201916:43 375-85-9
NaDONA 57 15 2.4 1 10/02/201916:43 958445-44-8
PFHxS 11 7.0 2.4 1 10/02/201916:43 355-46-4
PFOA 10 7.4 1.7 1 10/02/201916:43 335-67-1
PFNA ND 7.4 1.9 1 10/02/201916:43 375-95-1
PFOS 33 7.1 2.3 1 10/02/201916:43 1763-23-1
PFDA ND 7.4 1.8 1 10/02)201916:43 335-76-2
PFUdA ND 7.4 1.7 1 10/02/201916:43 2058-94-8
N-McF0SAA ND 15 4.7 1 10/02/201916:43 2355-31-9
N-EtF0SAA ND 15 4.1 1 10/02/201916:43 2991-50-6
PFDS ND 7.1 1.4 1 10/02/201916:43 335-77-3
PFDoA ND 7.4 1.5 1 10/02/201916:43 307-55-1
PFTrDA ND 7.4 1.4 1 10/02/201916:43 72629-94-8
PFTeDA ND 7.4 1.3 1 10/02/201916:43 376-06-7
PFHxDA ND 7.4 1.6 1 10/02/201916:43 67905-19-5
PFODA ND 7.4 2.7 1 10/02/201916:43 16517-11-6
Surrogate Standards
SS Compound Spiked Found %Recovery Limits Pass/Fail
13C2_PFHxA 2.0 0.22 11 70-130 Fail
13C2_PFDA 2.0 1.6 82 70-130 Pass
d5-EtFOSAA 8.0 7.9 99 70-130 Pass
Internal Standards
IS Compound Area Ical Limits CCV Limits Pass/Fail
13C3_PFPrOPrA 742 1777497- 5332492 2385238- 4770475 Fail
13C2_PFOA 781297 420197- 1260591 618215- 1236430 Pass
13C4_PFOS 1752427 1013401 - 3040203 1465486- 2930973 Pass
d3-MeFOSAA 1302577 568514- 1705543 840437- 1680873 Pass
50-150%of Ical area
70-140%of the preceding CCV area
Page 13 of 21
Report No 10491911_PFAA_DFR Page 11 of 19

SHEALY ENVIRONMENTAL SERVICES, INC.
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Detection Summary
City of Greensboro, Water Resources
Lot Number: U118011
Sample Sample ID Matrix Parameter Method Result Q - Units Page
001 XXI-9-17-19 Aqueous PFBS 537 Modified- 17 ng/L 5
001 XXI-9-17-19 Aqueous PFNS 537 Modified- 5.9 J ng/L 5
001 XXI-9-17-19 Aqueous PFHxS 537 Modified- 24 ng/L 5
001 XXI-9-17-19 Aqueous PFBA 537 Modified- 27 ng/L 5
001 XXI-9-17-19 Aqueous PFDA 537 Modified- 5.1 J ng/L 5
001 XXI-9-17-19 Aqueous PFDoA 537 Modified- 2.6 J ng/L 5
001 XXI-9-17-19 Aqueous PFHpA 537 Modified- 15 ng/L 5
001 XXI-9-17-19 Aqueous PFHxA 537 Modified- 54 ng/L 5
001 XXI-9-17-19 Aqueous PFNA 537 Modified- 5.0 J ng/L 5
001 XXI-9-17-19 Aqueous PFOA 537 Modified- 23 ng/L 5
001 XXI-9-17-19 Aqueous PFPeA 537 Modified- 42 ng/L 5
001 XXI-9-17-19 Aqueous PFOS 537 Modified- 74 ng/L 5
(12 detections) i
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healy Environmental Services,Inc. __ ___._— �. _�=_ _=____—��- y. — _ _.-,_z_ __—r_�
J6 Vantage Point Drive West Columbia,SC 29172 [phone] Fax[phone] www.shealylab.com
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