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Sample Storage <br /> Groundwater samples collected in the field are stored in an ice chest cooled to 4 °C <br />' while in transit to the office or analytical laboratory Samples are stored in a <br /> refrigerator overnight and during weekends and holidays. The refrigerator is set to 4 <br /> °C and is locked with access controlled by a designated sample custodian. <br /> Quality Assurance/Quality Control Objectives <br />' The sampling and analysis procedures employed by RESNA for groundwater sampling <br /> and monitoring follow quality assurance/quality control (QA/QC) guidelines. Quality <br /> assurance objectives have been established to develop and implement procedures for <br /> robtaining and evaluating water quality and field data in an accurate, precise, and <br /> complete manner In this way, sampling procedures and field measurements provide <br /> information that is comparable and representative of actual field conditions Quality <br /> control (QC) is maintained by site-specific field protocols and requiring the analytical <br /> laboratory to perforin internal and external QC checks The goal is to provide data that <br /> are accurate, precise, complete, comparable, and representative The definitions as <br /> developed by overseeing federal, state, and local agency guidance documents for <br /> accuracy, precision, completeness, comparability, and representativeness are <br /> • Accuracy --- the degree of agreement of a measurement with an <br /> accepted reference or true value. <br /> • Precision — a measure of agreement among individual measurements <br /> ' under similar conditions Usually expressed in terms of the standard <br /> deviation <br /> • Completeness — the amount of valid data obtained from a <br /> measurement system compared to the amount that was expected to meet <br /> the project data goals <br /> • Comparability — express the confidence with which one data set can <br /> ' be compared to another <br /> • Representativeness — a sample or group of samples that reflect the <br /> charactenstics of the media at the sampling point It also includes how <br /> well the sampling point represents the actual parameter variations which <br /> are under study <br /> RESNA INDUSTRIES, INC <br /> Groundwater Sampling Protocol <br /> Latest Revision October 23, 1991 <br />