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The laboratories selected to perform the analytical work are certified by the Department of <br /> Health Services (DHS) for hazardous waste testing. Table A-2 summarizes the analytical <br /> test methods to be used and the maximum sample holding times that are observed for a wide <br /> range of parameters. <br /> Quality Assurance/Quality Control <br /> Quality assurance/quality control measures are taken to confirm the integrity of the field <br /> 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 is included in the technical reports. <br /> Field Quality Assurance Procedures <br /> Field quality assurance procedures may be included in each monitoring event and include <br /> the documentation of field instrument calibration, and collection and analysis of trip <br /> blanks, field blanks, and duplicate samples. <br /> Trip blanks. Trip blanks are prepared at the same time and location as the sample <br /> containers for a particular sampling event. Trip blanks accompany these containers to <br /> and from that event, but are at no time opened or exposed to the atmosphere. <br /> Laboratory-grade water is obtained from the laboratory for use in preparation of trip <br /> blanks. Trip blanks are used to assess sample container cleanliness and contamination <br /> originating from sample handling and transportation. One trip blank for volatile organic <br /> parameters is typically included for each sampling event. <br /> Field blanks. Field blanks are prepared in the same manner as trip blanks but are <br /> exposed to the ambient atmosphere at a specified monitoring point during sample <br /> collection to determine the influence of the external field conditions on sample integrity. <br /> Field blanks are also used to assess contamination originating from sample handling and <br /> transportation. One field blank for volatile organic parameters is typically included for <br /> each day of sampling. Laboratory-grade water is obtained from the laboratory for use in <br /> preparation of field blanks. <br /> Duplicate samples. Duplicate samples are collected to document field precision. For <br /> each sampling event, duplicate monitoring well samples are collected at a specified <br /> frequency, typically 5 percent. Where possible, field duplicates are collected at sampling <br /> points known or suspected to contain constituents of interest. Duplicates are packed and <br /> shipped "blind" to the laboratory for analysis with the samples from that particular event <br /> (i.e., these samples do not exhibit any special markings indicating that they are quality <br /> control samples). <br /> Foothill WQPS Rev Ldoc <br /> A-7 <br />