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CALIFORNIA MATER LADS <br /> QUALITY AssURANCE[QUALr"CONTROL <br /> MANAGEMENT SUMMAIRY <br /> (Cantinu&d) <br /> Mcltdx Spikes <br /> To assess accuracy, a sample is chosen at random to spike with an analyte of <br /> Interest. Matrix spikes must be analyzed for every 20 samples or similar matrix or per <br /> bates,whichever is more frequent. Spiked samples are rcAewed in terms of percent <br /> recovery. <br /> Splko Duplicates <br /> To assess precision,the matrix spike above is prepared and analyzed in duplicate. <br /> 'this is done because many samples will not contain the analyte of interest and may <br /> not provide precision data. Spike duplicates are analyzed at the same frequency as <br /> matrix spikes. and results are compared in terms of the relative percent difference <br /> (RpD)betv6ccn the percent recovered for each of the duplicates. <br /> Acceptance criteria are as follows: <br /> Inorganic.warning limits for RPD and%Recovery are defined as±2X the standard <br /> deviation of the mean. Out-of-control limits for RPD and% Recovery are defined as <br /> + 3X the standard deviation of the mean. <br /> Organic. Out-of-control limits for RPD and%Recovery are defined as±2X the <br /> standarr' deviation of the mean with some exceptions that are ± 3X the standard <br /> deviation. <br /> Note: These limits do not apply to leachate extractions. <br /> (nstrurnent CaZbratlons <br /> rte, All analytical instruments are calibrated using standards of at least three different <br /> concentrations, including a standard at the concentration of the limit of detection. <br /> Samples must be diluted so that the raw data fall within Lbe concentration of the <br /> calibration. Acceptable methods for linearity include correLiaon coefficient.36RSD. <br /> and least squares curve fitting. <br /> CWL uses the protocol outlined in USEPA Contract Laboratory Program., State- <br /> ment of Work for Orgastic Analysis Multi-Media, Multi-Concentratlon, 10/86 <br /> revision. for tuning and calibration of all C-C/MS systems. <br /> WNW Spikes <br /> when samples are extracted or digcsted,a method blank Is spiked with an analyte <br /> of interest- The analysis of this sample may provide irlrormation regarding the <br /> preparation efficiency when matrix interferences are present_ <br /> 5 <br />