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B.10.5.1. Procedure <br /> These calibration procedures are for the YSI instrument, as listed in the YSI instrument <br /> handbook. If the YSI is not being used to record conductivity, please follow the manufacturer's <br /> calibration instructions. <br /> • Fill the calibration cup with the pH calibration solution so that the pH probe is covered. Use <br /> the following procedures for pH 4, 7, and 10 when calibrating. Start with pH 7. <br /> • Rinse the sensors with deionized water between changes of calibration buffer solutions. <br /> • During pH calibration, allow the sensors time to stabilize with regard to temperature before <br /> proceeding with the calibration protocol. <br /> • Recalibrate the pH values if necessary. <br /> B.10.5.2. Quality Assurance <br /> The following information about the field measurement of pH shall be logged for CIA <br /> documentation: <br /> • Source and expiration date of buffers used <br /> • Instrument manufacturer and model number <br /> • Date of Calibration <br /> • Historical data of aquifer if known (e.g. DS Aquifer with high TDS) <br /> B.11. Standard Test Method for the Field Measurement of Temperature <br /> B.11.1. Introduction <br /> Temperature readings are important for numerous applications. They are used in the <br /> measurement of Eh, pH, conductivity, and DO and in saturation and stability studies. It is <br /> important to know the temperature of groundwater for the accurate geochemical evaluation of <br /> equilibrium thermodynamics. Temperature readings of ±1`C are necessary for the above <br /> applications. <br /> B.11.2. Scope <br /> This procedure gives general guidance and recommendations that shall be considered when <br /> taking a temperature measurement. There are numerous instruments on the market that can <br /> provide adequate temperature measurements. Each instrument operating manual shall be <br /> consulted for detailed procedures. <br /> B.11.3. Significance and Use <br /> Temperature is a basic physical property that is measured by the response of matter to heat. <br /> There are many devices that, once calibrated, are acceptable for taking temperature <br /> measurements. These devices include liquid in glass (mercury in glass), thermocouples, <br /> bimetallic, and electrical-resistance thermometers. At a minimum, the device should measure <br /> temperature to±1/10'C readability. <br /> Daub &Associates, Inc. Page B-27 Natural Soda LLC 2022 SAP <br />