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® records and chain-of-custody forms are included in Appendix A. <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 />