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B.11.4. Interferences <br /> The instrument operating manual shall be consulted to identify any interferences particular to <br /> the device being used. In general, the true sample temperature is affected by the atmospheric <br /> temperature of the surroundings and the temperature of the devices used to collect the <br /> sample. <br /> B.11.5. Apparatus <br /> • Temperature-measuring device <br /> • Distilled or deionized water in a squeeze wash bottle <br /> B.11.5.1. Procedure <br /> • Rinse the thermometer with deionized water <br /> • Immerse the thermometer in the sample. <br /> • Allow the reading to stabilize and record the temperature. <br /> B.11.5.2. Quality Assurance <br /> The following information about the temperature measurement shall be logged for QA <br /> documentation: <br /> • Instrument used <br /> • Temperature of sample and date <br /> B.12. Standard Practice for the Use of a Flow Cell for Field Measurements <br /> B.12.1. Introduction <br /> Reliable field measurements are an essential part of a groundwater sampling program. Some <br /> properties or constituents in groundwater may change considerably within a few minutes of <br /> collection. These changes are caused by turbulence, heating or cooling, depressurization, and <br /> gas exchange with the atmosphere. Use of a closed flow-through cell will minimize these <br /> changes. NS does not currently use a flow cell during sampling events. <br /> B.12.2. Scope <br /> This procedure describes the use of a closed flow-through cell for monitoring selected chemical <br /> parameters in groundwater. The cell is used when monitoring for the measurement of pH, <br /> ORP, conductivity,temperature, and DO under conditions as close to in situ as practical; e.g. the <br /> purging of stagnant water from monitor wells before sample collection. <br /> B.12.3. Significance and Use <br /> Flow cells allow the sampling technician to obtain test results that are more representative of <br /> conditions present in the water as it resides in the ground. Fewer chemical and physical <br /> Daub &Associates, Inc. Page B-28 Natural Soda LLC 2022 SAP <br />