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and with decafluorotriphenylphosphine (DFTPP) for semi- volatile analyses to determine adequate ion abundance. Once the systems are calibrated and tuned, analysis and quality control measures follow those procedures outlined in the general requirements above. Compounds analyzed by gas chromatography are tentatively identified by comparing retention times of the sample and the standard. Retention time windows are based on ± 3 standard deviations from the average of 3 injections of a particular analyte over a 72 hour period. Linder certain conditions, tentatively identified compounds must be confirmed on a second column of different affinity. Sample quantitation procedures are outlined in each method. Method detection limits are quantified according to SW-846 Chapter 1, Revision 1, December 1987. All calculations and instrumentation parameters are documented in the analysts' notebook. Inorganics - Metals and Wet Chemistry Appropriate procedures for sample extraction, preparation, and clean-up are referenced in the individual methods in SW- 846 1986 and the 1987 revision as well as in "Standard Methods for the Examination of Water and Wastewater" 16th Edition 1985, and are followed accordingly. In addition to the general requirements lis'ted above, each analyte must have a calibration curve calculated from a reagent blank and three higher concentrations of the analyte that define the linear quantitation range for that analyte. Each concentration, including the reagent blank, must be analyzed 3 times and the average used to determine the calibration curve. The %RSD must be <15% for the curve to be considered linear through the orig�i. The $RSD's, the calibration curve, and the calculations from the triplicate analysis of the four calibration concentrations are documented in the analysts' notebook. The curve is verified at least once daily and must be within lot of the original line. The verification is documented in the analyst's notebook. Standards used to establish the calibration curves are renewed quarterly. All calculation and instrumentation parameters are kept in the analyst's notebook. Bacteriology/Bioassay _ The bacteriology department adheres to the quality control measures set out in EPA-600/8--78-017 December 1978 "Microbial Methods for Monitoring the Environment". Because bacterial analyses are ill suited to the internal duality control measures required of other analyses, they are subject to strict external requirements. - 12