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<br />WSB & ASSOCIATES <br />AQUEOUS SAMPLES PER- AND POLYFLUOROALKYL SUBSTANCES ANALYSIS <br /> SGS AXYS METHOD: MLA-110 <br />5036: L33032-1 to -5 <br /> <br />Project name: Lino Lakes WTP Feasibility 015822-000 <br />24 June 2020 <br /> <br /> <br />NARRATIVE <br /> <br />This narrative describes the analysis of five aqueous samples for the determination of per- and polyfluoroalkyl <br />organic compounds by ultra-high performance liquid chromatography/tandem mass spectrometry (UHPLC-MS/MS). <br /> <br /> <br />SAMPLE RECEIPT AND STORAGE <br /> <br />The sample was received at SGS AXYS on the 6th of May, 2020. The temperature of the samples upon receipt was <br />2.2˚C, meeting the method recommended arrival temperature of 0-4°C. The samples were stored at -20˚C in the <br />dark prior to extraction and analysis. <br /> <br /> <br />SAMPLE EXTRACTION AND ANALYSIS <br /> <br />The field and QC samples were analyzed in one analysis batch designated as WG72387; the composition of the <br />batch is shown on the Correlation Table included with this data package. The QC samples consisted of a procedural <br />blank, a lab-generated reference sample known as the Ongoing Precision and Recovery (OPR) sample and a <br />duplicate OPR. The lab blank and OPRs were prepared using Canadian Springs water as the matrix. <br /> <br />Sample extraction, instrumental analysis, and analyte quantification procedures were done in accordance with <br />SGS AXYS Method MLA-110: Analytical Procedure for the Analysis of Per- and Polyfluoroalkyl Substances <br />(PFAS) in Aqueous Samples, Solids and Solvent Extracts by LC-MS/MS. A method summary (MSU-110) of <br />SGS AXYS Method MLA-110 is included with the data package. <br /> <br />Approximately 500 mL of sample was accurately weighed and spiked with isotopically labeled quantification <br />standards and extracted and cleaned up by solid phase extraction (SPE) using a disposable cartridge containing a <br />weak anion exchange sorbent. After spiking each sample with labeled recovery (internal) standards, the extracts <br />were analyzed by LC-MS/MS. Analyte concentrations were determined by isotope dilution/internal standard <br />method, comparing the area of the quantification ion to that of the isotopically labeled standard. <br /> <br />The reporting limit (RL) was defined as the concentration equivalent to the lowest calibration standard (CS1) or the <br />sample specific detection limit (SDL), whichever was greater. <br /> <br /> <br />REPORTING CONVENTIONS <br /> <br />The SGS AXYS contract number assigned for internal tracking was 5036. The samples were assigned a unique <br />laboratory identifier L33032-X; where X is a numeral; all data reports reference this unique SGS AXYS ID plus the <br />client sample identifier. To assist in locating data, a table correlating the SGS AXYS ID with the client sample <br />numbers is included with this data package. The report forms were generated using Laboratory Information <br />Management Systems (LIMS) software. <br /> <br />Any extra work required and performed after the initial instrumental analysis of the sample extract was given an <br />extra “test suffix” code. The single letter code per extra work performed was added to the SGS AXYS sample ID <br />as a suffix, and was combined with any other applicable test suffix codes. The extra work code used to report data <br />in this package include: <br /> <br />(A) = parent sample for a duplicate pair <br /> <br />www.axysanalytical.com <br />Page 3 of 94