Table 9. Calibration frequency and allowable drift Allowable Drift Water Quality Points Pre-Measurement Calibration Accuracy Check (Measurement Parameter Per Calibration Adjustment Frequency Check) Frequency Accuracy) pH 2 Before monitoring day After every monitoring day ± 0.2 units Before every After every Specific ± Per manufacturer Conductivity monitoring monitoring 10% day day Once ± annually Per Temperature Per manufacturer against a manufacturer thermometer Before every After every ± Turbidity 2 monitoring monitoring 10% day day Per Before every Velocity monitoring n/a2 ±10% day1
Table 9. Calibration frequency and allowable drift Water Quality Parameter Points Per Calibration Pre-Measurement Calibration Adjustment Frequency Accuracy Check Check) Frequency Allowable Drift (Measurement Accuracy) pH 2 Before monitoring day After every monitoring day ± 0.2 units Specific Conductivity Per manufacturer Before every monitoring day After every monitoring day ± 10% Temperature Per manufacturer Per manufacturer Once annually against a thermometer ± Turbidity 2 Before every monitoring day After every monitoring day ± 10% Velocity Per Before every monitoring day1 n/a2 ±10%
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