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SOP #12 <br /> Date:9/1/93 <br /> Page 18 of 31 <br /> 6.4 QAIQC SAMPLES <br /> 6.4.1 Trip Blanks <br /> A trip blank is a suite of sample bottles containing deionized water that is prepared <br /> by the laboratory. Trip blanks (aqueous) will accompany each shipment of water <br /> sample containers from the laboratory. The trip blanks will be kept with the same <br /> shipment of sample containers at all times and will be returned, unopened, to the <br /> laboratory with that shipment. Trip blanks will be used to detect any contamination <br /> or cross-contamination during handling and transportation. One trip blank set is <br /> sent per cooler of samples per day. <br /> 6.4.2 Rinsate Samples <br /> Rinsate samples are defined as samples that are obtained by running deionized <br /> water through sample collection equipment (i.e., California-modified sampler, <br /> continuous soil sampler, auger, spatula, etc.) after decontamination. These rinsate <br /> samples will be collected in the appropriate sample containers and sent to the <br /> laboratory for analysis. They will be used to determine if decontamination <br /> procedures have been effective. One rinsate sample per 20 samples will be collected <br /> and sent to the laboratory. <br /> 6.4.3 Matrix SpikeZMatrix Spike Duplicate for Soil Samples <br /> Matrix spikes and matrix spike duplicates are prepared in the laboratory to help <br /> determine long-term precision and accuracy of an analytical method on various <br /> matrixes. A matrix spike and matrix duplicate are generated by preparing three <br /> separate samples for analysis from the same soil sample, and then spiking the <br /> second and third samples with selected target compounds. For metals determined <br /> by ICP analysis, for example, the spike contains all the analyte metals at levels <br /> approximately five times the reporting limit. Following the addition of the spike to <br /> the matrix spike and matrix spike duplicate, these two QC samples are carried <br /> through all laboratory procedures and analyzed as are the <br />