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The pH meter and the conductivity meter are calibrated prior to <br />all sampling events. The pH meter is calibrated using the 2 - <br />point method. The expected pH is bracketed by the pH of the <br />calibration solution. In most cases the pH meter will be <br />calibrated at 7.0 and 10.0 which will bracket all of the current <br />monitoring results. If an expected pH is less than 7, the pH <br />meter will be calibrated at 4.0 and 7.0. <br />Flow - One of two methods, 1) time of flow into a container of <br />known size and 2) utilize a portable 60" V -Notch weir. <br />RN -07 2.05-41 02/18 <br />