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A1.4.6 Completeness <br /> 1 Measurements of completeness (C) can be defined as the ratio of usable measurements <br /> J obtained to the total number of planned measurements for an activity. Completeness <br /> can be defined as: <br /> (Number of usable data points) <br /> C = x100 <br /> (Total number of planned data points) <br /> Additionally, for a data set to be considered complete, the data set must contain all QC <br /> check analyses verifying precision, accuracy, and sensitivity for the analytical protocols. <br /> ' This will be determined during the data validation process. Following data validation and <br /> usability assessment, the percent completeness can be calculated. <br /> A2.0 LABORATORY AND INTERNAL QUALITY CONTROL CHECKS <br /> The analytical laboratories will follow their quality control procedures and analyzed <br /> the following QC samples as part of their internal procedures. <br /> A2.1 Field and Laboratory QC Samples <br /> Field duplicate samples will be collected by field personnel during sampling activities. <br /> In addition, the following QC samples will be prepared by the laboratory: laboratory <br /> replicates, matrix spikes, method blanks, and method-specific QC samples. The <br /> -) following provides a summary of these different types of QC samples. <br /> Field Duplicates: Field duplicates measure the combined random error (imprecision) <br /> due to sampling and analysis as well as the short-range heterogeneity of the sampled <br /> medium between the juxtaposed locations or times. The sample containers for the field <br /> duplicates will be filled, labeled, and handled as other field samples. One field <br /> .: duplicate will be collected for each analytical method for each sampling day. <br /> t Laboratory Replicates: Laboratory replicates are used to measure the contribution of <br /> the analytical process to the overall imprecision of data. Laboratory replicates are <br /> employed for inorganic analyses, while MSDs are used to measure the analytical <br /> imprecision of organic methods. Laboratory replicates will be analyzed at the <br /> frequency of 1 per 20 samples. MSDs will be analyzed at the rate of 1 per 20 samples <br /> or 1 per sampling event, whichever is greater. <br /> Matrix Spikes: MSs are aliquots of field samples that are spiked with a known amount <br /> of standard. The unspiked and spiked aliquots are analyzed and the recovery of the <br /> spiked standard is determined. The recovery is used to approximate the analytical bias <br /> of the method. MSs will be analyzed at the rate of 1 per 20 samples or 1 per sampling <br /> day, whichever is greater. <br /> i <br />