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should be clearly identified in the QAPjP. When samples are collected for <br /> volatile organic analysis, a trip blank is also recommended for each day that <br /> samples are collected. In addition, for each sampling batch (20 samples of one <br /> matrix type) , enough volume should be collected for at least one sample so as to <br /> allow the laboratory to prepare one matrix spike and either one matrix duplicate <br /> or one matrix spike duplicate for each analytical method employed. This means <br /> that the following control samples are recommended: <br /> •Field duplicate (one per day per matrix type) <br /> •Equipment rinsate (one per day per matrix type) <br /> •Trip blank (one per day, volatile organics only) <br /> •Matrix spike (one per batch [20 samples of each matrix type]) <br /> •Matrix duplicate or matrix spike duplicate (one per batch) <br /> Additional control samples may be necessary in order to assure data quality to <br /> meet the project-specific DQOs. <br /> 3.4.2 Acceptance Criteria <br /> Procedures should be in place for establishing acceptance criteria for <br /> field activities described in the QAPjP. Acceptance criteria may be qualitative <br /> or quantitative. Field events or data that fall outside of established <br /> acceptance criteria may indicate a problem with the sampling process that should <br /> be investigated. <br /> 3.4.3 Deviations <br /> All deviations from plan should be documented as to the extent of, and <br /> reason for, the deviation. Any activity not performed in accordance with <br /> procedures or QAPjPs is considered a deviation from plan. Deviations from plan <br /> may or may not affect data quality. <br /> 3.4.4 Corrective Action <br /> Errors, deficiencies, deviations, certain field events, or data that fall <br /> outside established acceptance criteria should be investigated. In some in- <br /> stances, corrective action may be needed to resolve the problem and restore <br /> proper functioning to the system. The investigation of the problem and any <br /> subsequent corrective action taken should be documented. <br /> 3.4.5 Data Handling <br /> All field measurement data should be reduced according to protocols <br /> described or referenced in the QAPjP. Computer programs used for data reduction <br /> should be validated before use and verified on a regular basis. All information <br /> used in the calculations should be recorded to enable reconstruction of the final <br /> result at a later date. <br /> Data should be reported in accordance with the requirements of the end-user <br /> as described in the QAPjP. <br /> ONE - 12 Revision 1 <br /> July 1992 <br />