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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. <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 />B.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. <br />Page B-12 Natural Soda LLC 2015 S A P <br />