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Equipment Rinsate Blanks <br />In the even that non-dedicated sampling equipment is used, equipment rinsate blanks will be <br />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 <br />described in Appendix C, one equipment rinsate blank will be collected for every suite of <br />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 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 regulaz samples. <br />Quality Control Checks -Laboratory <br />The analytical laboratory analyses QA/QC sample internally. Blanks aze run at least one per <br />sampling event. Matrix spiking is performed by the laboratory to measure recoveries of analytes <br />for comparison to the established accuracy objective. American Soda will request a QC report <br />with every analytical report received. <br />6.5 Preventative Maintenance <br />If a procedure calls for the use of any instruments, the instrument will be calibrated according to <br />manufacturer's recommendations. In general, preventative maintenance will follow procedures <br />from the manufacturer. A schedule of calibration and maintenance will be kept with the <br />instrument. <br />7.0 Data Assessment and Action Procedures <br />Data quality is evaluated based on sampling techniques and analytical quality controls. A State <br />ofColorado-certified laboratory completes sample analysis; therefore, formalized audits of <br />laboratory systems by American Soda are not conducted. Periodic audits of field work aze <br />sufficient to ensure that SOPS aze being followed. Performance of both field and laboratory QA <br />systems are assessed based on results of laboratory and field quality control samples. <br />The general evaluation of data quality considers potential sources of error, including gross errors, <br />systematic error, and random errors. The percent difference between duplicate samples and the <br />analytical results from any blank samples aze routinely evaluated. <br />7.1 Water Quality Data <br />Water quality data aze complied as each data point is acquired. The environmental coordinator <br />reviews these data at each update. Numeric protection levels and "practice-based" permit <br />Draft Modification No. 9 UIC Area Permit No. C030858-00000 Page 36 of 44 <br />