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/ 1 1; <br /> Quality assurance objectives have been <br /> iefto d � lprocedures� � <br /> for obtaining and evaluating water qualitestablished <br /> andelddata n an accp and urate, <br /> way, sampling procedures and field ►neu-;uremettts provide <br /> complete manner. In this <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 /> labora,ory to perform internal and external QC checks. The goal is to provide data that <br /> as <br /> are accurate, precise, COMplete, comparable, and representative. <br /> aedocutmetttsdefnitionsfor <br /> developed by overseeing federal, state, and local agency guidance <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 /> r characteristics 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 /> Laboratory and field handling procedures of samples <br /> from monitored <br /> nitore'td bt•inQCding Qsamples <br /> samples for analysis with every submitted sample <br /> may include any combination of the following: <br /> • Trip Blanks: Used for purgeable, organic compounds only; QC <br /> samples are collected in 44 milliliter (ml) sample vials filled in the <br /> analytical laboratory with organic-free water. Trip blanks tto <br /> are <br /> the project site, and travel with project site samples. Trip blanks <br /> not opened, and are returned from a project site with the project site <br /> samples for analysis. <br /> EXcELTECH,INC. <br /> Groundwater Sampling Protocol <br /> Latest Revision: May 3, 1991 <br />