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Trip and Field Blanks Trip and field blanks were used during the sampling events to <br /> detect contamination introduced through sampling procedures, external field conditions, <br /> sample transportation, container preparation, sample storage, and the analytical process <br /> Trip blanks were prepared at the same time and location as the sample containers for a <br /> particular sampling event Trip blanks accompanied these containers to and from that <br /> event, but at no time were opened or exposed to the atmosphere One trip blank for <br /> volatile organic parameters was typically included for each sampling event <br /> Field blanks were prepared in the same manner as trip blanks but were exposed to the <br /> ambient atmosphere at a specified monitoring point during sample collection to determine <br /> the influence of the external field conditions on sample integrity One field blank for <br /> volatile organic parameters was typically included for each day of sampling. <br /> Duplicate Samples Duplicate samples were collected to document field precision For <br /> each sampling event, duplicate monitoring well samples were collected at a specified <br /> frequency, typically 5 percent Where possible, field duplicates were taken at sampling <br /> points known or suspected to contain constituents of interest Duplicates were packed and <br /> shipped "blind" to the laboratory for analysis with the samples from that particular event <br /> (i e , these samples did not exhibit any special markings indicating that they were quality <br /> control samples) <br /> Laboratory Quality Assurance/Quality Control Procedures <br /> Laboratory QA/QC procedures included those required under the DHS hazardous waste <br /> testing program Specific laboratory quality assurance procedures were included in the <br /> laboratory's QA/QC manual, including reporting surrogate recoveries, matrix spike <br /> recoveries, and matrix spike duplicates (or duplicate) results <br /> Method blanks were analyzed daily to assess the effect of the laboratory environment on <br /> the analytical results Method blanks were performed for each parameter analyzed <br /> Each sample to be analyzed for organic parameters contained surrogate spike compounds <br /> The surrogate recoveries were used to determine if the analytical instruments were <br /> operating within lirruts Surrogate recoveries were compared to control limits established <br /> and updated by the laboratory based on its historical operation <br /> Matrix spikes were analyzed at a frequency of approximately 10 percent Matrix spike <br /> results were evaluated to determine whether the sample matrix was interfering with the <br /> laboratory analysis and to provide a measure of the accuracy of the analytical data Matrix <br /> spike recoveries were compared to control limits established and updated by the <br /> laboratory based on its historical operation <br /> i <br /> SAC/pjZ\2520\252010001d1-941fe i A-8 Rev 0, 10/11/94 <br />