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Programmatic Sampling and Analysis Plan Project Number:60657245 9. Quality Control 9.1 Field Quality Control Samples Evaluation of field sampling procedures requires the collection and evaluation of field QC samples. To provide a means of assessing data quality resulting from the field sampling program, collection and submittal to the analytical laboratory includes field blanks, equipment blanks, and field duplicates. Field Blanks A field blank is a clean, analyte-free sample which is carried to the sampling site and then exposed to sampling conditions. The field blank is intended to provide information about contaminants that may be introduced during the sample collection, storage, and transportation of field samples. Field blanks will be collected at a rate of one per 20 field samples for the full analytical suite. The sample container is assigned a unique identification number in the field. Equipment Blanks An equipment blank, sometimes referred to as a rinsate blank, is a sample of analyte-free water poured over or through decontaminated field sampling equipment prior to the collection of environmental samples. It is used to assess the adequacy of the decontamination process in terms of contamination from the total sampling process when decontaminated sampling equipment is used to collect samples. Equipment blanks will be collected, at a rate of one per 20 field samples collected for the full analytical suite. The sample container is assigned a unique identification in the field. Matrix Spike/Matrix Spike Duplicates (as applicable) A MS/MSD sample is an aliquot of sample spiked with a known mass and concentration of specific analytes. The spiking occurs prior to sample preparation and analysis at the laboratory. To allow the analytical laboratory to run MS/MSD analyses, additional sample volumes will be collected in the field to provide sufficient sample material for the laboratory to perform the additional analyses. MS/MSDs will be collected at a rate of one per 20 field samples for the full analytical suite, as applicable to the analytical method. If possible, MS/MSD samples should be collected from a location expected to be relatively free from contamination as these will be used for laboratory quality control purposes. Field Duplicates Field duplicates will be collected at selected locations to provide estimates of the total sampling and analytical precision. Field duplicates will be collected at a rate of one per 10 field samples for the full analytical suite to provide estimates of the analytical precision. The field duplicates will be handled and analyzed in the same manner as the environmental samples; however,the chain- of-custody forms will not indicate which samples are duplicates. The field duplicates will be collocated duplicates that are collected simultaneously or immediately after the parent sample. If possible, field duplicates should be collected from a location with contamination as these results will be used to evaluate precision. A summary of the quality control samples is provided below: AECOM 19