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Appendix E: Quality Assurance and Control Assessment <br /> Third Quarter 2009 sampling was performed by FGL Environmental, Inc. on July <br /> 27, 2009, and all samples were analyzed by FGL Environmental, Inc. The <br /> analytical reports provided by the laboratories are included in Appendix D. <br /> Prescribed Holding Times <br /> Holding time is defined as the maximum time allowed between sample collection <br /> and sample analysis. Results become questionable when the holding time is <br /> exceeded. Holding times vary between constituents, and can range from a few <br /> hours to a few months. FGL Environmental, Inc. follows EPA recommended <br /> holding times for all constituents tested. All samples were analyzed within the <br /> prescribed holding times. <br /> Lab Blanks <br /> Laboratory blanks are analyzed using the same procedures as the environmental <br /> samples. The blanks consist of deionized and distilled (Reagent Grade Type II) <br /> water. Analysis of the blanks is used to detect potential contamination sources <br /> contributed by the laboratory. Examples can include improperly cleaned <br /> laboratory equipment, impure reagents, and persistent airborne contaminants in <br /> the laboratory environment. <br /> The QA/QC review identifies lab blanks with detections of target analytes and <br /> evaluates the effect of the detections on associated sample results. No <br /> contaminants were detected in laboratory blanks. <br /> Field Blanks <br /> Field blanks detect possible constituent sources contributed from sampling <br /> methods and equipment. Examples include, but are not limited to, improperly <br /> cleaned sampling equipment, persistent airborne constituents in the sampling <br /> environment, and constituent sources in the sample containers. Field blanks <br /> were not collected in 3rd Quarter 2009. <br /> Sample Duplicates <br /> Duplicates monitor matrix consistency or heterogeneity. No duplicate samples <br /> were collected in 3rd Quarter 2009. <br /> Matrix Spikes and Laboratory Control Samples <br /> Matrix spikes (MS), matrix spike duplicates (MSD), laboratory control samples <br /> (LCS), and laboratory control sample duplicates (LCSD) were analyzed by the <br /> laboratory to evaluate the accuracy and precision of the sample extraction and <br /> - E-1 - <br />