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Leaking Underground Fuel Tank Manual, State Water Resources Control Board, <br /> State of California Leaking Underground Fuel Tank Task Force, revised October <br /> 1989 <br /> The laboratories selected to perform the analytical work are certified by the Department of <br /> Health Services (DHS) for hazardous waste testing <br /> QUALITY ASSURANCE/QUALITY CONTROL <br /> Quality assurance/quality control(QA/QC) measures were taken to confirm the integrity of the <br /> field and laboratory data generated during the monitoring program. The procedures used to <br /> assess data quality are described in this section An evaluation of the field and laboratory <br /> quality assurance data will be included in the technical reports <br /> Field Quality Assurance Procedures <br /> Field quality assurance procedures were included in each monitoring event and included <br /> documenting field instrument calibration, and collecting and analyzing trip blanks, field blanks, <br /> and duplicate samples Split samples may also have been included ui the monitoring program. <br /> Tnp and Field Blanks Trip and field blanks were used during the sampling events to detect <br /> contamination introduced through sarnpling procedures, external field conditions, sample <br /> 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 sarnphng event Trip blanks accompanied these containers to and from that event, <br /> but at no time were opened or exposed to the atmosphere One trip blank for volatile organic <br /> 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 ambient <br /> atmosphere at a specified monitoring point during sample collection to determine the influence <br /> of the external field conditions on sample integrity One field blank for volatile organic <br /> parameters was typically included for each day of sampling <br /> Duplicate Samples Duplicate samples were collected to document field precision For each <br /> sampling event, duplicate monitoring well samples were collected at a specified frequency, <br /> typically 5 percent Where possible, field duplicates were taken at sampling points known or <br /> suspected to contain constituents of interest Duplicates were packed and shipped "blind" to <br /> . the laboratory for analysis with the samples from that particular event (Le , these samples did <br /> not exhibit any special markings indicating that they were quality control samples) <br /> SA(-,N\PJ2\2.52U2520E000 IGS 94\pas I <br />