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7. t <br />Wright Environmental Services, Inc. <br />Sample Records and Chain-of-Custody <br />Sample records for each sample will contain information on sample type and <br />source including; project number, sampler name, sampling date and time, location, <br />laboratory name, sampling method, and any significant conditions that may affect <br />the sampling. <br />A signature Chain-of-custody and transference documentation will be <br />maintained at all times. A copy of the Laboratory sample results and the completed <br />Chain-of-custody will be provided with the technical reporting. <br />Quality Control and Quality Assurance Objectives <br />The sampling and chemical laboratory analysis procedures employed for <br />groundwater sampling and monitoring follow quality assurance and quality control <br />(QA/QC) outlined in current Federal, State and local agencies guidance documents. <br />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 />measurements provide information that is comparable and representative of actual <br />field conditions. <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 />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 standard deviation. <br />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 />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. It also includes how well <br />the sampling point represents the actual parameter variations which are <br />under study. <br />WES Sampling Protocols Page 4