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'r <br /> Nftwv <br /> Wright Environmental Services, Inc. <br /> Sample Records and Chain-of-Custody <br /> 1. 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 /> 2. 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 /> 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 /> WES Sampling Protocols Page 4 <br />