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The quality control samples used to measure accuracy and precision affected by field activities <br />are described in Appendix C and are summarized below: <br />Distilled Water Blanks <br />These field blanks are samples of de-ionized or distilled water, which are submitted to the <br />laboratory for analysis. These blanks will be collected as a quality check on distilled water used <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 />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 regular samples. <br />• Quality Control Checks -Laboratory <br />The analytical laboratory analyses QA/QC sample internally. Blanks are 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 are <br />FINAL: Modification No. 9, UIC Area Permit No. C030858-00000 <br />Page 37 of 46 <br />