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Stockton 99 Speedway Quality Assurance Project Plan April 12,2007 assessment. As such, it is critical that the chemical data be of the highest confidence and quality. Consequently, strict QAIQC procedures will be adhered to. These procedures include: • Adherence to strict protocols for field sampling and decontamination procedures and analytical methods; • Collection and laboratory analysis of appropriate field equipment and trip blanks to monitor for contamination of samples in the field or the laboratory; • Collection and laboratory analysis of matrix spike, matrix spike duplicate, and field duplicate samples to evaluate precision and accuracy; and • Attainment of completeness goals. 7.1.1 Equipment Decontamination Non-dedicated equipment will be decontaminated before and after each sample is collected. The equipment will be washed in a non-phosphate detergent and potable water, rinsed in potable water, and then rinsed in distilled water. 7.1.2 Standards Standards used for calibration or to prepare samples will be certified by National Institute of Standards and Technology (NIST), USEPA, or other equivalent source. The standards will be current. The expiration date will be established by the manufacturer, or based on chemical stability, the possibility of contamination, and environmental and storage conditions. Standards will be labeled with expiration dates, and will reference primary standard sources if applicable. Expired standards will be discarded. 7.11.3 Supplies All supplies will be inspected prior to their use in the field or laboratory. The descriptions for sample collection and analysis contained in the methods will be used as a guideline for establishing the acceptance criteria for supplies. A current inventory and appropriate storage system for these materials will ensure their integrity prior to use. Efficiency and purity of supplies will be monitored through the use of standards and blank samples. 7.1.4 Preventative Maintenance SGI field technicians are responsible for documenting the maintenance of all field equipment prescribed in the manufacturer's specifications. Field personnel will perform scheduled maintenance. Procedures specific to the calibration, use and maintenance of field equipment will be presented in the respective sampling plan. The analytical laboratory is responsible for all laboratory equipment calibration and Quality_Assurance Project PlanFinW.doc 7-2 The Source Group,Inc.