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For general miner0analysis, the anion and cation Ulances should be determined. If the difference is more than 0I.3 meq/L or 5% (whichever is greater), the analysis should be rechecked. �. For GC/MS analyses, the overall precision and, accuracy of recovery is monitored by the addition of internal standards to every sample. I� XI. Corrective Action in Out-of--Control Situation!, The results obtained from the duplicate and the spiked samples should be within the acceptance limits. In the event of an ,out-of-control situation, the following (in order) should be investigated: V 1 ) . Check for errors in calculation 2) . Check calibration and instrument performance. Prepare new standards if necessary. �} 3) . Reanalyze, if possible, the duplicate or spiked sample. (prepare a new spiked sample if necessary) . 11 t If there is insufficient sample for reanalysis, an alternate sample from the set may be analyzed as either a duplicate or a spiked sample. If an instrument is not functioning properlyl, immediately notify the QA Director. If unavailable, then notify the lab', manager. If neither are available, then post a notice on the instrument indicating "out of order" condition, and continue working with other: instruments known to be functioning properly. Notify the QA Director,,� as s''oon as possible. A brief explanation identifying the probable cause of the out-of-control situation should be included with the data in the QA/QC notebook for duplicate and spiked samples. If matrix interference is cited in this explanation, the reported detection limit maty befincreased. XII. Analytical review Chemist/analyst will review each others data on a monthly basis and note the review of data by dating and initialling the °work or section reviewed in the analyst' s notebook. This internal checking of data by the chemist will be confirmed by the QA/QC Director. All work completed by a technician is checked by the technician's supervisor before publishing. Analytical results are recorded to show thedate'on which the data was obtained and the analyst responsible for the data. Precision and accuracy data (duplicates and spikes) are recorded by the analyst into the QA/QC notebooks kept by the analysts. An outline of corrective actions for out-of-control data will be posted at each instrument, and in the front of each QA/QC notebook, along with the- acceptance limits for pertinent method of analyses. XIII. Maintenance and Repair of Instruments Routine maintenance of equipment is performed by, the analyst whend b appropriate. Instrument maintenance and calibration is performe y qualified service technicians (usually servlice representatives of the instrument manufacturer) . Instrument repair is also performed by these technicians and a record (containing the date, the nature of the problem, description of the repair, and .the name of I,the technician) is also kept. -12-