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Quality Assurance/Quality Control Objectives <br /> The sampling and analysis procedures employed by RESNA for groundwater sampling <br /> and monitoring follow regulatory guidance for quality assurance/quality control <br />' (QA/QC) Quality assurance objectives have been established to develop and implement <br /> procedures for obtaining and evaluating water quality and field data in an accurate, <br /> precise, and complete manner. In this way, sampling procedures and field <br /> t measurements provide information that is comparable and representative of actual field <br /> conditions. Quality control (QC) is maintained by site-specific field protocols and by <br /> requiring the analytical laboratory to perform internal and external QC checks. The <br />' goal is to provide data that are accurate, precise, complete, comparable, and <br /> representative. The definitions as developed by overseeing federal, state, and local <br /> agency guidance documents for accuracy, precision, completeness, comparability, and <br />' 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 /> t • 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 /> characteristics of the media at the sampling point. <br />' Laboratory and field handling procedures of samples may be monitored by including <br /> QC samples for analysis. QC samples may include any combination of the following• <br /> 1 <br /> • Trip Blanks: Trip blanks are sent to the project site, and travel with <br /> project site samples. Trip blanks are not opened, and are returned <br />' from a project site with the project site samples for analysis. <br /> RESNA INDUSTRIES INC <br /> Groundwater Sampling Protocol <br /> Latest Revision September 18, 1992 <br /> 1 <br />