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Wright Environmental Services, Inc. <br />complete, comparable and representative. The definitions as developed by overseeing federal, state, <br />and local agency guidance documents for accuracy, precision, completeness, comparability and <br />representativeness are: <br />o Accuracy - the degree of agreement of a measurement with an accepted reference or <br />true value. <br />o Precision - a measure of agreement among individual measurements under similar <br />conditions. Usually expressed in terms of standard deviation. <br />o Completeness - the amount of valid data obtained from a measurement system <br />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 be compared to <br />another. <br />o Representativeness - a sample or group of samples that reflect the characteristics of the <br />media at the sampling point. It also includes how well the sampling point represents the <br />actual parameter variations which are under study. <br />Revisions and Modifications <br />This protocol may be amended for specific work plans, regulatory guidance, field conditions or <br />modified for special work as needed or at regulatory request. This protocol has been prepared using <br />current suggested guidance documents for use in site assessment project work plans, and will use the <br />modifications contained therein as well as the experience of supervising professional given the actual <br />site specific conditions. Work will not be done which could provide cross contamination exposure of <br />strata. <br />Wes Sampling Protocols last rev. 2/96 Page <br />