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RPR-0B-1999 10 41 RGRPITO RSSOCIRTES 970 245 9234 P.05 <br />Drafr April 7, 1999 pag¢ 3 <br />6.5 Internal Quality Control Checks <br />6.5.1 Quality Control Checks-Field Aetivilies <br />The quality control samples used to measure accuracy and precision affected by field <br />activities aze described in Appendix C and are summarized below: <br />Field Blanks <br />Field blanks aze samples of de-ionized or distilled water which are submitted to the <br />laboratory for analysis. Field blanks will be collected as a quality check on sample preparation <br />technique, external contamination, and the analytical method. One blank per sampling event will <br />be analyzed using the technique described in Appendix C. Field blanks will be labeled and Handled <br />as regular samples. <br />Equipment Rinsate Blanks <br />Equipment rinsate blanks will be collected to ensure that sampling equipment is clean and <br />that potential for cross~ontaminadon has been min;m;~~ by the equipment decontamination <br />procedures. Using the technique described in Appendix C, one equipment rinsate blank will be <br />collected for every suite of samples which 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 blank duplicate sample will be collected for every suite of samples using the <br />technique described in Appendix C. The duplicates will be labeled and handled as regulaz saanples. <br />6.5.1 Quality Control Checks-Laboratory <br />'ihe analytical laboratory analyzes QA1QC samples internally. Blanks aze run at least one <br />per sampling event. Matrix spiking is performed by the laboratory to measure recoveries ofanalytes <br />for comparison to the established accuracy objective. American Soda will request a QC repoart with <br />every analytical report received. <br />Matrix Spike Sam lames <br />A set of duplicate samples called matrix spike (MS)/matrix spike duplicates (MSD) samples <br />wi I I be analyzed by the laboratory using a minimum of one in every 30 samples collected as part of <br />the internal monitoring program, including blanks and duplicates. The analysis of samples spiked <br />Agapito Associates, Inc. <br />