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5.0 QUALITY CONTROL REQUIREMENTS This section presents QC requirements for the analysis of environmental samples that will be followed during all project analytical activities. The purpose of the QC program is to produce data of known quality that satisfy the project objectives and meet or exceed the requirements of the standard methods of analysis. This program provides a mechanism for ongoing control and evaluation of data quality measurements through the use of QC materials. 5.1 Quality Control Procedures The chemical data to be collected will be used to determine that the extent of affected media is properly evaluated. The data should be of the highest quality and confidence to achieve this objective. The following QA/QC procedures will be utilized: • Strict protocols for field sampling and decontamination procedures; • Collection and laboratory analysis of appropriate field equipment blanks to monitor for cross-contamination of samples in the field and laboratory; • Collection and laboratory analysis of matrix spike, matrix spike duplicate, and field duplicate samples to evaluate analytical precision and accuracy. 5.1.1 Equipment Decontamination Nondedicated equipment used for sample collection will be decontaminated before and after each sample is collected. The sampling equipment will be washed in an Alconox and potable water solution, and double rinsed in potable water. More specific descriptions for decontamination of nondedicated equipment, including downhole equipment, are presented in the FSP. 5.1.2 Standards Current laboratory standards will be used to calibrate laboratory equipment or to prepare samples and will be certified by National Institute of Standards and Technology, USEPA, or other equivalent source. The expiration data will be established by the manufacturer, or based on Environmental/LNC/workplan/Appendix3.wpd 7