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Page 10 of 10 <br />SOP NUMBER 8.0 <br />Field Parameter Measurements <br />Compare voltage and temperature value to the data on the bottle of the redox buffer solution or <br />on the table below if the difference is higher than +/- 30mV clean or change the electrode. <br />Record calibration verification on the log sheet. Admissible range is +/- 5mV. <br />Temperature degrees Celsius mV Range pH <br />20 220 7.02 <br />25 220 7.00 <br />30 212 6.90 <br />1.5 Turbidity <br />The turbidity meter is factory calibrated and requires no field calibration. The factory calibration <br />shall be checked before the turbidity meter is sent to the field. Additionally, the calibration of <br />the turbidity meter will be checked daily before collection of samples again at a known formazin <br />standard. The instrument will be recalibrated as necessary based on the daily check. Refer to <br />the manufacturer's instruction manual for proper use. <br />Powertech <br />4/23/2007 <br />Rev SOP 8-1 JAB <br />8-10 <br />R Squared Inc <br />E'