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Water Quality Measurements Field Standard Operating Procedure <br /> SWE-FSOP-101;Revision 1 Ahtna Southwest Environmental Operations <br /> [PFAS Project]: Use field logbook made of standard/loose plain paper(non-weatherproof), <br /> held together by an aluminum or Masonite field clipboard.Alternatively, a spiral-bound <br /> notebook with non-weatherproof paper and/or cover can be used. <br /> • Waterproof, indelible pens/markers in black or blue ink <br /> [PFAS Project]: Ball-point pens: do not use markers,felt pens, or pens with water resistant <br /> ink <br /> • Digital camera/video, cell phone, or other devices capable of digital imagery <br /> • Appropriate PPE <br /> • Multi-parameter instrument with probe/sonde' <br /> • Flow Cell <br /> • Timing Device <br /> • Graduated Cylinder <br /> • Tubing <br /> • Fittings to attach purge and sample tubing to flow-through cell <br /> • Calibration solutions (ORP, Conductance,turbidity, and pH) <br /> Refer to project work plans to confirm equipment required for the specific water quality measurement <br /> activity <br /> 4.0 Procedures <br /> 4.1 Calibration <br /> Before taking any field measurements, calibrate instruments according to the procedures described <br /> below. If the instrument has an instrument-specific procedure,follow the manufactures instructions. Use <br /> field form SWE-FFRM-801, Multi-Probe Calibration to document field calibrations. <br /> Calibration using a known reference solution for field parameters as applicable should be performed daily <br /> before collecting water quality data according to the manufacturer's specifications for the instrument. <br /> If an instrument fails to calibrate, perform troubleshooting as described in the manufacturer's manual. <br /> Confirm that the calibration standards have not expired. If there are anomalous readings during sample <br /> collection, stop and recalibrate if possible. If the issue cannot be resolved, use a backup instrument, or <br /> consult with the PL to determine if data collection should continue. Flag any data recorded from a meter <br /> with calibration problems. <br /> 4.1.1 pH Calibration <br /> If the water being monitored is known to be either basic or acidic, calibrate using a 2-point calibration <br /> method to ensure the highest accuracy.A 2-point calibration uses only two pH buffer calibration solutions. <br /> For example, if the pH is known to vary between 5.5 and 7, a 2-point calibration with a pH 7 and pH 4 <br /> buffer solution is sufficient. <br /> 'Meters that are typically used to collect Water Quality Parameters include the YSI Pro Plus and the Horiba U-50. <br /> Links to the user manuals for both instruments are provided in section 7.0. <br /> Page 6 of 8 <br />