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1 SECTION IX CORRECTIVE A.0 TION The control chart, predetermined acceptance limit, or EPA acceptance criteria serve as alert systems for unsatisfactory j or unexpected results. The nature of corrective action may take several forms, bp.at the first step is usuatly to repeat the analysis on the sample which failed. If the repeat does not replicate the failure, and prior and subsequent QC data do not indicate a systematic error, -the value may be treated as a random error and disregarded. More commonly, diagnosis and correction of an analytical problem will follow. If the repeat analysis continues to show difficulty, the analyst will bring it to the section super- visor's attention. 7f the required correction is not readily apparent, the supervisor will call in the laboratory technical director and the quality assurance manager. Together, they �.. � plan a series of steps to isolate and correct the problem. Based on frequency of occurrence and correctibility, the usual checking order includes: 1. Check the calculations. 2. Examine the sample for non-homogeneity or peculiar interferences. 3. Restandardize any titrating agents used in the test. 4. Check instruments for proper performance. 5. Verify that standard solutions are fresh and properly prepared. 6. Assure the purity of reagent water. 7. Closely observe the analyst to be certain no procedural errors are occuring. During the troubleshooting process, routine analysis for that determination is discontinued. once the problem is found and corrected, the best estimate is made of when the problem first occurred. Data collected after this critical point is discarded. If possible, all analyses since the last valid control check will be repeated. Analyses performed after the resolution of the problem must be accompanied by more IX-1 +a..r