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1 <br /> field blank for volatile organic parameters will typically be included for each day of <br /> ' sampling <br /> Duplicate samples. Duplicate samples will be collected to document field <br /> ' precision For each sampling event, duplicate soil samples will be collected at a <br /> specified frequency, typically 5 percent Where possible, field duplicates will be <br /> taken at sampling points known or suspected to contain constituents of interest <br /> ' Duplicates will be packed and shipped "blind" to the laboratory for analysis with the <br /> samples from that particular event (i e , these samples will not exhibit any special <br /> markings indicating that they are quality control samples) <br /> ' Laboratory Quality Control Procedures <br /> Laboratory quality control procedures will include those required under the OEHHA <br /> Hazardous Waste Testing Program Specific laboratory quality assurance <br /> procedures are included in the laboratory's QA/QC manual, including reporting <br /> ' surrogate recoveries, matrix spike recoveries, and matrix spike duplicates (or <br /> duplicate) results <br /> Method blanks will be analyzed daily to assess the effect of the laboratory <br /> environment on the analytical results Method blanks will be performed for each <br /> parameter analyzed <br /> Each sample to be analyzed for organic parameters will contain surrogate spike <br /> compounds The surrogate recoveries will be used to determine if the analytical <br /> ' instruments are operating within limits Surrogate recoveries will be compared to <br /> control limits established and updated by the laboratory based on its historical <br /> ' operation <br /> Matrix spikes will be analyzed at a frequency of approximately 10 percent Matrix <br /> spike results will be evaluated to determine whether the sample matrix is interfering <br /> ' with the laboratory analysis and to provide a measure of the accuracy of the <br /> analytical data Matrix spike recoveries will be compared to control limits <br /> established and updated by the laboratory based on its historical operation <br /> Laboratory ry duplicates will be analyzed at a frequency of approximately 10 percent <br /> Spike duplicate results will be evaluated to determine the reproducibility (precision) <br /> ' of the analytical method Reproducibility values will be compared to control limits <br /> established and updated by the laboratory based on its historical operation <br /> tLaboratory QA/QC data will be included with the analytical results This QA/QC <br /> data will include method blanks, surrogate spike recoveries (for organic parameters <br /> ' only), matrix spike recoveries, and matrix spike duplicates <br /> C -15 <br />