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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 i <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 I <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 />