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The laboratories selected to perform the analytical work will be certified by the Department of <br />Health Services for hazardous waste testing. Table D-2 summarizes the analytical test methods <br />to be used and the maximum sample holding times that will be observed. <br />QUALITY ASSURANCE/QUALITY CONTROL <br />Quality assurance/quality control (QA/QC) measures will be taken if requested to confirm <br />the integrity of the field and laboratory data generated during the monitoring program. <br />The procedures used to assess data quality are described in this section. An evaluation of <br />® the field and laboratory quality assurance data will be included in the technical reports. <br />• s, <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 and <br />from that event, but are at no time opened or exposed to the atmosphere. Trip blanks are <br />used to assess sample container cleanliness and contamination originating from sample <br />handling and transportation. One trip blank for volatile organic parameters is typically <br />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 />i each day of sampling. <br />iDuplicate samples. Duplicate samples are collected to document field precision. <br />Duplicate monitoring well samples are collected at a specified frequency, typically 5 <br />percent. Where possible, field duplicates are collected at sampling points known or <br />suspected to contain constituents of interest. Duplicates are packed and shipped "blind" to <br />the laboratory for analysis with the samples from that particular event (i.e., these samples <br />will not exhibit any special markings indicating the origin of the samples). <br />SAC\N.\PJM3M390031.9$G-94 sdg:4 D-8 Rev. 0, 420/95 <br />