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LFR Levine-Fricke that the decontamination of equipment between samples is sufficient. The equipment blank samples are evaluated to confirm there is no cross contamination between sampling locations due to contamination on the sampling device. The sample containers for the equipment blank samples will be filled, labeled, and handled in the same manner as other field samples. One equipment blank sample will be collected for each analytical method for each sampling day. Laboratory Replicates: Laboratory replicates are used to measure the contribution of the analytical process to the overall imprecision of data. Laboratory replicates are employed for inorganic analyses, while MSDs are used to measure the analytical imprecision of organic methods. Laboratory replicates will be analyzed at the frequency of 1 per 20 samples. MSDs will be analyzed at the rate of 1 per 20 samples or 1 per sampling event, whichever is greater. Matrix Spikes: MSs are aliquots of field samples that are spiked with a known amount of standard. The unspiked and spiked aliquots are analyzed and the recovery of the spiked standard is determined. The recovery is used to approximate the analytical bias of the method. MSs will be analyzed at the rate of 1 per 20 samples or 1 per sampling day, whichever is greater. Method Blanks: Laboratory method blanks are used to assess laboratory contamination during performance of a method. Laboratory method blanks will be run at a minimum frequency of 1 per 20 samples or one per day. G2.2 Data Validation Procedures Data validation is performed on the project analytical data when the final analytical report is received by LFR. The data validation will include a data completeness review of each data package, and a review of QA/QC parameters as described in this appendix and as indicated in the National Functional Guidelines to ensure that all project analytical data are of reliable and comparable data quality. Specifically, the following QA/QC parameters will be reviewed: • holding times (to assess potential for degradation that will affect accuracy) • blanks (to assess contamination for all compounds) • MSs/MSDs or Laboratory Fortified Blanks (to assess accuracy of the methods and precision of the method relative to the specific sample matrix) • Internal Standards(to assess method accuracy and sensitivity) • Compound Quantitation Limits and MDLs (to assess sensitivity as compared to project-specific requirements) • Co-located samples RPDs (to assess precision of the method relative to field sampling techniques, the specific sample matrix, and representativeness of the sample aliquot to the area sampled) Page G-8 Final_RAP_Tracy_9.18.03(final).doaLFR