Laserfiche WebLink
Page 5 of 10 <br />SOP NUMBER 8.0 Field Parameter Measurements <br />3. Decontaminate the ORP meter probe and associated equipment in accordance with SOP No. <br />10.0, Decontamination of Sampling Equipment. <br />QC requirements for ORP measurements are provided in Section 5.3. <br />5.2.5 Turbidity <br />The turbidity may be measured at the time of sample collection. A portable turbidity meter will <br />be used for field determination of turbidity in the parameter samples. <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 against 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 />The turbidity test measures an optical property of the water sample that results from the <br />scattering and absorbing of light by the particulate matter present. The amount of turbidity <br />registered is dependent on such variables as the size, shape, and refractive properties of the <br />particles. This procedure is commonly calibrated using formazin turbidity standards, and the <br />readings are in terms of nephelometric turbidity units (NTUs). <br />Turbidity is measured as follows: <br />1. Rinse the turbidity meter probe with deionized water. If the turbidity is measured in a container, <br />rinse the sample container with deionized water and then rinse it three times with the water to be <br />sampled prior to measurement <br />2. Insert the probe into the parameter sample and allow the turbidity reading to stabilize. When <br />stable, take a turbidity reading and record it in the field logbook. <br />3. Decontaminate the turbidity meter probe and associated equipment in accordance with SOP <br />No. 10.0, Decontamination of Sampling Equipment. <br />QC requirements for turbidity measurements are provided in Section 5.3. <br />5.2.6 In-flow Multi-Parameter Monitoring System <br />The in-flow multi-parameter monitoring system or similar multi-parameter instruments may be used <br />for measuring pH, temperature, conductivity, D.O., ORP, and turbidity. In-flow meters allow for the <br />analysis of purge water, in-line, as it flows so that sampling can begin as soon as water stabilizes. <br />The manufacturer's operation and maintenance manual shall be followed when operating or <br />calibrating the instrument. <br />5.3 QUALITY ASSURANCE/QUALITY CONTROL <br />QA/QC activities will be conducted in accordance with the governing applicable documents as <br />well as quality requirements presented in this SOP. As noted in Section 5.2, all meters will be <br />calibrated daily prior to use. In addition, each meter will be inspected daily prior to calibration. <br />Powertech <br />4/23/2007 <br />Rev SOP 8-1 JAB <br />8-5 <br />R Squared Inc <br />Ej: