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CGRS, Inc. <br />• Method blanks; <br />• Laboratory control samples: <br />• Calibration check samples; <br />• replicate samples; <br />• Matrix-spiked samples; <br />• "Blind" quality control samplers; <br />• Control charts; <br />• Surrogate samples; <br />• Zero and span gases; and <br />• Reagent quality control checks. <br />Blind Dun tu ales <br />Blind duplicate samples will be collected for 10% of the samples collected or once per site, whichever is <br />greater. These blind duplicate samples will be forwarded to the laboratory as a check of laboratory <br />reproducibility. <br />Eauipment (Rinseafel Blarrk <br />The equipment (rinseate) blank is designed to identify potential crosscontamination in the field between <br />sample sources due to deficient field cleaning procedures. This blank also addresses field preservation <br />procedures, environmental site interference, integrity of the source blank water for field cleaning and those <br />concems singularly addressed by the travel blank. Equipment blanks are taken once per site, when <br />equipment is cleaned in the field. This provides a quality control check on field cleaning procedures. <br />Field Blank <br />Field blanks are used to evaluate the sample container filling procedure, the effects of environmental <br />contaminants at the sire, purity of preservatives or additives and those concems uniquely addressed by [he <br />[ravel blank. <br />Field blanks are taken downwind of the most contaminated area of the site by filling laboratory cleaned and <br />prepared sample containers (appropriate for the parameters group) with deionized or organic-free water <br />supplied by the laboratory. The blank sample container is then sealed, grouped, transported and stored with <br />the real samples collected for the same parameters group. <br />