Laserfiche WebLink
Field Eouinment Calibration <br />Proper maintenance, calibration, and operation of each field instrument will be the responsibility <br />of the field personnel and the instrument technicians assigned to the project. All instruments and <br />equipment used during the program will be maintained, calibrated, and operated according to the <br />manufacturers' guidelines and recommendations. <br />Field equipment will be calibrated prior to use in the field as appropriate. The calibration <br />procedures will follow standard manufacturers' instructions to ensure that the equipment is <br />functioning within established tolerances and as required by the project. A record of field <br />calibration of analytical instruments will be maintained in the calibration logbook by field <br />personnel. Copies of the instrument manuals and other equipment calibration records (e.g., <br />thermometers, sounders) will be maintained. Any notes on unusual results, changing of <br />standards, battery charging, and operation and maintenance of the field equipment will be <br />included in the calibration logbook. <br />All instruments are to be stored, transported, and handled with care to preserve equipment <br />accuracy. Damaged instruments will be taken out of service immediately and not used again <br />until a qualified technician repairs and recalibrates the instruments. <br />Calibration Procedures <br />Equipment calibration is performed in accordance with the manufacturer's instructions, and <br />calibration checks will be performed each day prior to the start of work. Calibration of rental <br />equipment will be performed by a qualified technician prior to shipment of the equipment. <br />Calibration standards will be used once. Spent calibration liquids will be placed in plastic bottles <br />and transported off-site for disposal. A brief summary of the calibration procedures for field <br />measurement equipment is provided below: <br />pH.. Calibration for pH will be performed prior to commencement of sampling activities, <br />using standard buffer solutions having pH values of 4, 7, and 10. Calibration checks for pH <br />values using buffer solutions of 4, 7, and 10 will be performed daily. If the reading varies <br />more than 0.10 of a unit between calibration checks, the meter will be recalibrated. <br />• Conductivity: Calibration for conductivity will be performed prior to commencement of <br />sampling activities, using potassium chloride (KCl) standard solutions with conductivity <br />values of 1,000 and 10,000 microsiemens/cm. The meter must read within one percent of <br />full-scale to be considered calibrated. Calibration checks for conductivity will be performed <br />daily. <br />• Turbidity Meter: Turbidity range calibration will be performed prior to initiation of sampling <br />activities, using turbidity gel standards of 0, 4.4, 45, and 483 NTUs. The meter is also <br />checked daily during the sampling period with the standard most representative of the <br />anticipated turbidity of the purged groundwater (typically 0 NTUs to 10 NTUs). If the <br />4 <br />U:\For rdSAplan.doc <br />