Laserfiche WebLink
Field Equipment 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 /> D AFC_SApian2SA09.doc <br /> Geologic Associates <br />