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Temperature. Temperature will be measured with an NBS <br /> mercury thermometer and reported to the nearest 1/2 degree <br /> centigrade. <br /> Specific Conductivity. The specific conductivity will be <br /> measured with a specific conductivity meter. Readings will <br /> be reported to the number of significant figures appropriate <br /> for the measurement. <br /> o Preventive Maintenance. Preventive maintenance of equipment is <br /> essential if project resources are to be used in a cost effective <br /> manner. Preventive maintenance will take two forms: (1) a <br /> schedule of preventive maintenance activities to minimize downtime <br /> and ensure accuracy of measurement systems and (2) availability of <br /> critical spare parts, backup systems, and equipment. <br /> o Corrective Action. If quality control audits of data result in <br /> detection of unacceptable data, the individual in charge of the <br /> specific investigation will be responsible for developing and <br /> initiating corrective action. Corrective action for field <br /> measurements may include: <br /> - Repeat the measurement to check the error. <br /> - Check for all proper adjustments for ambient conditions <br /> such as temperature. <br /> - Check the batteries (if any) of instrument or measurement <br /> device. <br /> - Check the calibration of instrument or measurement device. <br /> - Replace the instrument or measurement devices. <br /> Corrective action for sampling procedures may include: <br /> - Evaluating and amending sampling procedures. <br /> - Reanalyzing samples if holding time criteria permits. <br /> A-2 <br />