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a If the above criteria is not met, the Calibration <br /> Curve can be used for quantitation if the residual, <br /> r, Is greater than 0 .995« <br /> a If neither criteria is net, the standard analyses must <br /> be repeated if quantitation is to be performed. <br /> o If the quantitation criteria are not net, <br /> documentation of the ability to see the required <br /> minimum detectable concentration is sufficient to <br /> determine the presence or absence of target compounds. <br /> The working average Calibration Factor or Calibration Curve <br /> must be verified an each working day by the introduction of <br /> one or more calibration standards. The frequency of <br /> verification is detector dependent, and varies from once <br /> per day to an average of once every five samples . <br /> a If the response of any analyte varies from the <br /> predicted response by more than ♦/- 15X, a neer <br /> calibration curve must be prepared for that analyte . <br /> (R1-R2) <br /> o The Percent Difference - -------•- x 100, where RI <br /> RI <br /> the Cr from the first analysis, and R2 - the CF from <br /> the second analysis . <br /> p <br /> 20 <br />