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December 23, l99> Page 26 <br />• during sampling events. One blank suite per sampling event will be analyzed using the technique <br />described in Appendix C. Blanks will be labeled and handled as regular samples. <br />Eguipruen! Rnnsate Blanks <br />In the event that non-dedicated sampling equipment is used, equipment rinsate blanks will <br />be collected to ensure that sampling equipment is clean and that potential for cross-contamination <br />has been minimized by the equipment decontamination procedures. Using the technique described <br />in Appendix C, one equipment rinsate blank will be collected for every suite of samples which <br />were collected utilizing decontaminated equipment. <br />Duplicates <br />Duplicate samples will be collected and submitted for laboratory analysis to allow a <br />determination of natural sample variance, consistency of field and lab techniques, and analytical <br />precision. One duplicate sample will be collected for every suite of samples using the technique <br />described in Appendix C. The duplicates will be labeled and handled as regular samples. <br />5.5.2 Qrra/ity Control C/reeks-Laboratory <br />• The analytical laboratory analyzes QA/QC samples internally. Blanks are run at least one <br />per sampling event. Matrix spiking is performed by the laboratory to measure recoveries of <br />analytes for comparison to the established accuracy objective. American Soda will request a QC <br />report with every analytical report received. <br />Matrix Spike Samples <br />A set of duplicate samples called matrix spike (MS)/matrix spike duplicates (MSD) <br />samples will be analyzed by the laboratory using a minimum of one in every 30 samples collected <br />as part of [he internal monitoring program, including blanks and duplicates. The analysis of <br />samples spiked with a known amount of analyte will monitor possible matrix effects specific to <br />the sample media. Accuracy will be determined from the recovery rates of compounds (the matrix <br />spike compounds defined in the analytical methods). Precision will be assessed by comparison of <br />matrix spike recoveries of the duplicates. The addition of known concentrations of <br />compounds/parameters into the sample also monitors extraction/digestion efficiency. These <br />QA/QC samples are processed internally by the laboratory, and no additional field samples will be <br />submitted for this procedure. <br />• <br />Agapito Associates, Inc. <br />