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' 1.1 Quality Control Data Review <br /> This appendix presents Earth Tech's quality control data review for this sampling event. The <br /> quality control data review was performed by an Earth Tech chemist. <br /> ro <br /> The quality assurance/quality control (QA/QC) program includes using standard sample <br /> collection procedures in the field and established analytical methods in the laboratory.Laboratory <br /> and field QC sample results were evaluated to assess the quality of individual sample results and <br /> overall method performance. Analytical performance was evaluated on the basis of both <br /> individual samples and QC batches (groups of samples prepared and analyzed together).The data <br /> evaluation of four groundwater samples collected during the June 2008 sampling event included a <br /> review of the following: <br /> • Sample integrity(chain-of-custody documentation, sample preservation,and holding <br /> time compliance) <br /> Blanks(method,field,equipment, and trip blanks) <br /> ' • Spikes(surrogates,laboratory control samples,and matrix spikes) <br /> • Duplicates(laboratory control spikes,matrix spikes, and field duplicates) <br /> Lab qualifiers(to determine impact on sample results) <br /> Groundwater samples were analyzed for the following analytes during this sampling event: <br /> ' CAM-17 metals, N-Nitrosodimethylamine by modified EPA Method 607, volatile organic <br /> hydrocarbons (VOCs), and semi-volatile organic hydrocarbons (SVOCs). The results of the data <br /> evaluation are summarized below. <br /> 1.1.1 Sample Integrity <br /> lete and consistent. Samples were preserved as <br /> Chain-of-custody documentation was comp <br /> required per method specifications. All samples were analyzed within method-specified holding <br /> times. <br /> 1.1.2 Blanks <br /> A method blank consists of deionized water carried through each step of the analysis with the <br /> environmental samples for each parameter and QC batch. A trip blank is a vial filled with <br /> deionized water that accompanies the groundwater samples throughout the sampling event. No <br /> analytes were detected in method blank or trip blank samples. <br />