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<br /> <br /> <br />7-1 <br /> <br />Section 7 <br />Instrument/Equipment Calibration <br />and Frequency <br />This section describes the calibration of field instruments used during the Project and those used by <br />the laboratory. <br />7.1 Water Quality Field Instruments <br />Field instruments will be calibrated according to the schedule presented in Error! Reference source <br />not found.. Calibrations performed by personnel in the field will also be recorded on the field data <br />sheets. If calibration is not successful or other issues pertaining to calibration arise, the instrument <br />will not be used. <br /> <br />Table 7-1. Field Instrument Calibration and Frequency <br />Parameter Calibration Frequency Standard or Calibration Instrument Used <br />pH Every sampling day pH 7.0, 4.0, and 10.0 buffers <br />DO Every sampling day Water-saturated air, according to manufacturer’s instructions and post-deployment check <br />SC Every sampling day Conductivity standard (1,413 microSiemens per centimeter) and distilled water <br />Turbidity Every sampling day 20, 100, and 800 NTU solutions <br />ORP Every sampling day Zobell solution or equivalent <br /> <br />7.2 Laboratory Instruments <br />The analytical laboratory performs calibration practices and calibration checks as part of the method <br />SOPs. The QAO shall review these practices and confirm that they comply with project requirements. <br />