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i.. <br /> GROINDWATER SAMPLING AND ANALYSIS <br /> Quality Assurance/Quality Control Objectives <br /> '"' The sampling and analysis procedures employed by HETI for groundwater sampling and <br /> monitoring follow specific Quality Assurance/Quality Control (QA/QC) guidelines. Quality <br /> Assurance(QA)objectives have been established by HETI to develop and implement procedures <br /> for obtaining field data and evaluating water quality in an accurate, precise and complete <br /> manner so that sampling procedures and field measurements provide information that is <br /> comparable and representative of the actual field conditions. Quality Control (QC) is <br /> maintained by HETI by using specific field protocols and requiring the analytical laboratory to <br /> `r perform internal and external QC checks. It is the goal of HETI to provide data that are <br /> accurate, precise, complete, comparable, and representative. The definitions for accuracy, <br /> precision,completeness, comparability, and representativeness are as follows: <br /> 1. Accuracy-the degree of agreement of a measurement with an accepted reference or true <br /> value. <br /> �. 2. Precision-a measure of agreement among individual measurements under similar <br /> conditions. Usually expressed in terms of standard deviation. <br /> `r 3. Completeness-the amount of valid data obtained from a measurement system compared to <br /> the amount that was expected to meet the project data goals. <br /> 4. Comparability- the confidence with which one data set can be compared with another. <br /> 5. Representativeness- the degree to which a sample or group of samples reflect the <br /> characteristics of a media at a given sampling point. Also includes the degree to which a <br /> sampling point represents the actual parameter variations which are under study. <br /> As part of the HETI QA/QC program, applicable federal, state and local reference documents <br /> are to be followed. The procedures outlined in these regulations,manuals,handbooks,guidance <br /> documents and journals are incorporated into the HETI sampling procedures to assure that: (1) <br /> groundwater samples are properly collected, (2) groundwater samples are identified, <br /> �.• preserved, and transported in a manner such that they are representative of field conditions, <br /> and (3) chemical analyses of samples are accurate and reproducible. <br /> V <br /> V <br /> V <br /> !.r <br /> 5 <br />