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b <br /> o Check for possible matrix interference with surrogate <br /> areas: <br /> E <br /> a Reanalyze: <br /> a Reextract . <br /> 0 out of Control Situations for a Methods <br /> ror a method. out of control conditions occur" when quality <br /> control data, such as blanks, duplicates and spikes, do not meet <br /> the quality acceptance criteria . Cach specific method SOP <br /> details the out of control conditions for the method. Out of <br /> control situations include.. but are not limited to, the <br /> following general conditions, as appropriates <br /> u <br /> a Blanks <br /> o "out of control" if background is greater than two <br /> to five tines the Method Detection Limit or Limit of <br /> Detection (method/analyte specific); <br /> a Duplicates <br /> o "Out of control" if the Relative Percent Difference <br /> (RPD) is outside the method Upecific acceptance <br /> criteria: <br /> �s Spikes <br /> o "Out of control" if the analyte recovery is <br /> outside of the method specific acceptance criteria . <br /> o "Out of control" if the RPD between spike duplicates <br /> xs outside the method specIfxc acceptance criteria . <br /> Each specific method SOP includes steps to follow for the <br /> resolution of these conditions, and they include, t are not <br /> I limited to, the following general actions, as appropriate . <br /> o Blanks <br /> a Reanalyze: <br /> I a Perform method/instrument specific maintenance: <br /> a Reanalyze: <br /> a Reextract. <br /> I <br /> 27 <br /> 1 <br />