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B.5.5. Flow Cell <br /> During a sampling event in which the flow cell will be used on multiple wells, the flow cell must <br /> be, at a minimum, thoroughly rinsed with deionized water (DIW) between wells. When <br /> warranted, e.g. if solids are noted to have been passed into the flow cell, the flow cell should be <br /> thoroughly washed with laboratory grade glassware detergent (Dawn dish detergent may be <br /> acceptable) and rinsed with DIW. Dedicated wash and rinse buckets should be available during <br /> a sampling event to decontaminate equipment as required. During the sampling event the flow <br /> cell should be stored and transported in a plastic bag or other suitable container. After the <br /> sampling event the flow cell should be thoroughly washed with detergent, rinsed with DIW, air <br /> dried or dried with lint free laboratory grade tissue and stored in a plastic bag or other suitable <br /> container. NS does not currently use a flow cell during sampling events. <br /> B.5.6. Fluid Collection Containers <br /> It is not necessary to decontaminate purge fluid collection containers; however, care must be <br /> taken to not allow any purge fluid to come into contact with sample fluid or containers. <br /> Single use, disposable sample collection containers are recommended for transferring the <br /> groundwater sample to the laboratory sample bottles when sampling wells that flow at higher, <br /> more uncontrolled rates. <br /> 13.6. General Considerations for the Sampling of Liquids <br /> B.6.1. Introduction <br /> The importance of proper sampling techniques for liquids cannot be overemphasized. Many <br /> factors shall be considered to obtain a sample that is: (1) representative of the population being <br /> sampled; (2) collected in a manner that does not compromise the sample; (3) preserved <br /> properly until it can be analyzed in the laboratory; and (4) documented so that it can be <br /> properly traced. Accurate sampling shall be responsive to all of these considerations and to <br /> other items discussed in this procedure. <br /> B.6.2. Scope <br /> Because the objective of most liquid sampling is to obtain a sample that is representative of the <br /> population being sampled and retains the physical and chemical properties of the population, <br /> the sampling technician shall make decisions concerning sample types, equipment to be used, <br /> QC, and decontamination that will greatly affect the results obtained from the sampling event. <br /> The information provided in this procedure will guide the sampling technician and provide the <br /> necessary background for the proper collection of liquid samples. <br /> B.6.3. Significance and Use <br /> The two general sample types are grab samples (to include other discrete sampling <br /> methodologies) and composite samples. Discrete sampling is the methodology of choice by NS <br /> Daub &Associates, Inc. Page B-12 Natural Soda LLC 2022 SAP <br />