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Compliance & Closure, Inc <br /> Groundwater Sampling Protocol <br /> Latest Revision October 1999 <br /> refrigerator is set to 4 C and is locked with access controlled by a designated sample custodian <br /> Quality Assurance/Quality Control Objectives <br /> The sampling and analysis procedures employed by Compliance & Closure, Inc for groundwater sampling and <br /> monitoring follow quality assurance/quality control (QA/QC) guidelines Quality assurance objectives have <br /> been established to develop and implement procedures for obtaining and evaluating water quality and field data <br /> in an accurate, precise, and complete manner In this way, sampling procedures and field measurements provide <br /> information that is comparable and representative of actual field conditions Quality control (QC) is maintained <br /> by site-specific field protocols and requiring the analytical laboratory to perform internal and external QC <br /> checks The goal is to provide data that are accurate, precise, complete, comparable, and representative The <br /> definitions as developed by overseeing federal, state, and local agency guidance documents for accuracy, <br /> precision, completeness, comparability, and representativeness are <br /> 0 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 the <br /> standard deviation <br /> o Completeness - the amount of valid data obtained from a <br /> measurement system compared to the amount that was expected to <br /> meet the project data goals <br /> o Comparability - express the confidence with which one data set can be compared to another <br /> o Representativeness - a sample or group of samples that reflect the characteristics of the media at <br /> the sampling point It also includes how well the sampling point represents the actual <br /> parameter variations which are under study <br /> Laboratory and field handling procedures of samples are monitored by including QC samples for analysis with <br /> every submitted sample lot from a project site QC samples may include any combination of the following <br />