OHA Drinking Water Services
OR41
PWS ID: 90607 ---- GRONER ELEMENTARY SD 1J
PFAS Sample Results

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Initial Monitoring
EP ID Entry point name Water
type
Availability Frequency Schedule
begin
Schedule
end
First quarter or
First sample
Second quarter or
Second sample
Third
quarter
Fourth
quarter
EP-A EP FOR WELL #2 GW Permanent 2 samples 1/1/2023 12/3/2025 N/A N/A
For each active entry point served by groundwater, collect 2 consecutive samples within a 12-month period with samples collected 5 to 7 months apart.


Sample Summaries
For compliance? EP ID Entry point name Sample date # Detections # MCL
exceedances
Sample ID
No EP-A EP FOR WELL #2 08/26/2025 0 0 2508239-01
Yes EP-A EP FOR WELL #2 12/03/2025 0 0 2512016-01RE1


Sample Results
For compliance? EP ID
Entry point name Sample date Received date Analyte
code
Analyte abbreviation
Analyte name
Result (ng/L)
MCL
(ng/L)
MRL
(ng/L)
Sample ID Lab ID Lab name Analysis method Method name TINWSF
ISN
TSASAMPL
ISN
TSASAR
ISN
SelectDataSet SelectAnalyte SelectDetects SelectLabID SelectLabName SelectMethod SelectMethodName
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2813 11Cl-PF3OUdS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969299 No 2813 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2821 4:2FTS 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969191 No 2821 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2820 6:2FTS 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969209 No 2820 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2822 8:2FTS 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969173 No 2822 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2814 9Cl-PF3ONS 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acd ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969281 No 2814 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2815 ADONA 4,8-Dioxa-3H-perfluorononanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969263 No 2815 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2816 HFPO-DA Hexafluoropropylene oxide dimer acid ND 10 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969245 No 2816M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2827 NFDHA Nonafluoro-3,6-dioxaheptanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969083 No 2827 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2819 PFBA Perfluorobutanoic acid ND 5.38 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969227 No 2819 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2801 PFBS Perfluorobutanesulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969479 No 2801M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2807 PFDA Perfluorodecanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969371 No 2807 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2808 PFDoA Perfluorododecanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969353 No 2808 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2826 PFEESA Perfluoro(2-ethoxyethane)sulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969101 No 2826 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2802 PFHpA Perfluoroheptanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969461 No 2802 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2829 PFHpS Perfluoroheptanesulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969047 No 2829 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2809 PFHxA Perfluorohexanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969335 No 2809 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2803 PFHxS Perfluorohexanesulfonic acid ND 10 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969443 No 2803M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2825 PFMBA Perfluoro-4-methoxybutanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969119 No 2825 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2823 PFMPA Perfluoro-3-methoxypropanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969155 No 2823 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2804 PFNA Perfluorononanoic acid ND 10 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969425 No 2804M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2806 PFOA Perfluorooctanoic acid ND 4.0 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969389 No 2806M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2805 PFOS Perfluorooctanesulfonic acid ND 4.0 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969407 No 2805M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2824 PFPeA Perfluoropentanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969137 No 2824 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2828 PFPeS Perfluoropentanesulfonic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969065 No 2828 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
No EP-A EP FOR WELL #2 08/26/2025 10/20/2025 2812 PFUnA Perfluoroundecanoic acid ND 2.15 2508239-01 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3004531 3969317 No 2812 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2813 11Cl-PF3OUdS 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062889 Yes 2813 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2821 4:2FTS 1H,1H, 2H, 2H-Perfluorohexane sulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062835 Yes 2821 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2820 6:2FTS 1H,1H, 2H, 2H-Perfluorooctane sulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062844 Yes 2820 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2822 8:2FTS 1H,1H, 2H, 2H-Perfluorodecane sulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062826 Yes 2822 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2814 9Cl-PF3ONS 9-Chlorohexadecafluoro-3-oxanonane-1-sulfonic acd ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062880 Yes 2814 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2815 ADONA 4,8-Dioxa-3H-perfluorononanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062871 Yes 2815 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2816 HFPO-DA Hexafluoropropylene oxide dimer acid ND 10 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062862 Yes 2816M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2827 NFDHA Nonafluoro-3,6-dioxaheptanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062781 Yes 2827 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2819 PFBA Perfluorobutanoic acid ND 4.74 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062853 Yes 2819 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2801 PFBS Perfluorobutanesulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062978 Yes 2801M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2807 PFDA Perfluorodecanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062924 Yes 2807 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2808 PFDoA Perfluorododecanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062915 Yes 2808 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2826 PFEESA Perfluoro(2-ethoxyethane)sulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062790 Yes 2826 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2802 PFHpA Perfluoroheptanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062969 Yes 2802 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2829 PFHpS Perfluoroheptanesulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062763 Yes 2829 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2809 PFHxA Perfluorohexanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062906 Yes 2809 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2803 PFHxS Perfluorohexanesulfonic acid ND 10 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062960 Yes 2803M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2825 PFMBA Perfluoro-4-methoxybutanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062799 Yes 2825 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2823 PFMPA Perfluoro-3-methoxypropanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062817 Yes 2823 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2804 PFNA Perfluorononanoic acid ND 10 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062951 Yes 2804M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2806 PFOA Perfluorooctanoic acid ND 4.0 1.42 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062933 Yes 2806M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2805 PFOS Perfluorooctanesulfonic acid ND 4.0 1.42 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062942 Yes 2805M N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2824 PFPeA Perfluoropentanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062808 Yes 2824 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2828 PFPeS Perfluoropentanesulfonic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062772 Yes 2828 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS
Yes EP-A EP FOR WELL #2 12/03/2025 03/03/2026 2812 PFUnA Perfluoroundecanoic acid ND 1.90 2512016-01RE1 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS 13715 3062463 4062897 Yes 2812 N 18 DEQ LABORATORY DIVISION 533 PFAS ISOTOPE DILUTION AEX SPE LC/MS/MS