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1.1.3 Spikes <br /> Surrogates are spiked into blanks, environmental samples, quality control samples, and standards <br /> for organic analyses to evaluate accuracy on a sample-specific basis. Surrogates were added to all <br /> samples analyzed for VOCs,and SVOCs. All surrogate recoveries were within control limits. <br /> Laboratory control samples/laboratory control sample duplicates (LCS/LCSD) are well- <br /> characterized, laboratory-generated samples used to monitor the laboratory's day-to-day <br /> performance for analyses and assess the accuracy of the analytical process independent of matrix <br /> effects.All LCS/LCSD recoveries were within control limits. <br /> Matrix spikes are environmental samples that have been spiked with a known concentration of a <br /> related compound and are used to monitor precision of analytical results. Matrix spike recoveries <br /> were within control limits for all organic and inorganic analytes,except for mercury analysis.The <br /> MS/MSD recovery for mercury had high bias, and the associated samples were non-detected for <br /> mercury. The effect on overall quality of the data is not expected to be significant. <br /> 1.1.4 Duplicates <br /> One field duplicate sample from monitoring well MW-2 was collected. Relative percent <br /> differences for all laboratory control spike and matrix spike duplicates indicate good precision of <br /> analytical results. The field duplicate sample results indicate good precision during this sampling <br /> event. <br /> 1.1.5 Reporting of Results and Detection Limits <br /> All analytical results and RLs are adjusted for dilutions resulting from the preparation procedures <br /> required by the method or to get the result for a compound or analyte within the calibration range <br /> of the instrument. <br /> 1.1.6 Laboratory and Data Validation Qualifiers <br /> An Earth Tech chemist reviewed the analytical data and confirmed the laboratory's findings. All <br /> data met the QA/QC criteria and no qualifiers were assigned. <br />