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Wright Environmental Services, Inc. <br /> Quality control is maintained by site specific field protocols and requiring the <br /> analytical laboratory to preform internal and external QC checks The goal is to <br /> provide data that are accurate, precise, complete, comparable and representative <br /> The definitions as developed by overseeing federal, state, and local agency guidance <br /> documents for accuracy, precision, completeness, comparability and <br /> representativeness are <br /> o Accuracy - the degree of agreement of a measurement with an <br /> accepted reference or true value <br /> o Precision - a measure of agreement among individual measurements <br /> under similar conditions Usually expressed in terms of standard deviation <br /> o Completeness - the amount of valid data obtained from a measurement <br /> system compared to the amount that was expected to meet the project data goals <br /> o Comparability - express the confidence with which one data set can <br /> be compared to another <br /> o Representativeness - a sample or group of samples that reflect the <br /> characteristics of the media at the sampling point It also includes how well <br /> the sampling point represents the actual parameter variations which are <br /> under study <br /> Revisions and Modifications <br /> This protocol may be amended for specific work plans, regulatory guidance, field <br /> conditions or modified for special work as needed or at regulatory request This <br /> protocol has been prepared using current suggested guidance documents for use in <br /> site assessment project work plans, and will use the modifications contained therein <br /> as well as the experience of supervising professional given the actual site specific <br /> conditions Work will not be done which could provide cross contamination <br /> exposure of strata <br /> WES Sampling Protocols last rev 5/96 Page 7 <br />