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