ARCHIVED REPORTS_XR0005507 - Laserfiche WebLink

Home Browse Search

Trip blanks were prepared at the same time and location as the sample containers for a particular sampling event. Trip blanks a,.:cornpanied these containers to and from that event, but at no time were opened or exposed to the atmosphere. One trip blank for volatile organic parameters was typically included for each sampling event. Field blanks were prepared in the same manner as trip blanks but were exposed to the ambient atmosphere at a specified monitoring point during sample collection to detemiine the influence of the external field conditions on sample integrity. One field blank for volatile organic parameters was typically included for each day of sampling. Duplicate Samples. Duplicate samples %sere collected to document field precision. For each sampling event, duplicate monitoring well samples were collected at a specified frequency, typically S percent. Where possible, field duplicates were taken at sampling points known or suspected to contain constituents of interest. Duplicates were packed and shipped "blind" to the laboratory for analysis with the samples from that particular event (i.e., these samples did not exhibit any special markings indicating that they were quality control samples). • LABORATORY QUALITY ASSURANCE/QUALITY CONTROL PROCEDURES Laboratory QA/QC procedures included those required under the DHS hazardous waste testing program. Specific laboratory quality assurance procedures were included in the laboratory's QA/QC manual, including reporting surrogate recoveries, matrix spike recoveries, and matrix spike duplicates(or duplicate) results. Method blanks were analyzed daily to assess the effect of the laboratory environment on the analytical results. Method blanks were performed for each parameter analyzed. Each sample to be analyzed for organic parameters contained surrogate spike compounds. The surrogate recoveries were used to determine if the analytical instruments were operating within limits. Surrogate recoveries were compared to control limits established and updated by the laboratory based on its historical operation. Matrix spikes were analyzed at a frequency of approximately 10 percent. Matrix spike results were evaluated to determine whether the sample matrix was interfering with the laboratory analysis and to provide a measure of the accuracy of the analytical data. Matrix spike recoveries were compared to control limits established and updated by the laboratory based on its historical operation. sA(_W\'12\252CT2.5201000.1 PS-94\pu:1 A-y Rev.O,4111!95