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1 <br /> ' Section 10 <br /> 0tiS1TE Environmental Laboratories Inc Revision 0 <br /> ! Quality Assurance Plan February 16, 1996 <br /> ' Page 4 of 6 <br /> prelimunary processing and the instrumental analysts If rhe spiking material <br /> used in these samples is derived from another, second source than calibration <br /> standards, these samples may be used as an LCS Most digestion and <br /> extraction batches include at least one blank spike <br /> 10 1 7 Surrogate Spikes <br /> 1 Surrogate spiking compounds are analyte compound substitutes, that is, they <br /> are compounds which chemically behave sirrularly to the target compounds, but <br /> are not specifically requested to be analyzed and are most often not naturally <br /> occurring Because they are similar to the target compounds, they are <br /> ' considered to mimic the chemical behavior and to be representative of the <br /> recovery of the target compounds Surrogate compounds are added to every <br /> sample for analysts after aliquots have been measured out for analysts and <br /> before they are taken through the whole sample preparation process By adding <br /> surrogates to all samples, the laboratory and the clients are able to evaluate <br /> ' analyte recoveries in every sample <br /> The analysis of metals does not currently utilize surrogates <br /> The SOP for each method that requires surrogates lists the surrogate <br /> preparation, concentration and acceptance criteria used by ONSITE <br /> 1 The equation for calculating surrogate spike recovery is given in Section <br /> 7221 <br /> 102 Confirmation <br /> The identification of inorganic analytes is inherent in the method and does not require <br /> Iconfirmation The identification of organic compounds by GC/MS is considered to be <br /> fully confirmed and no further testing is necessary Compounds identified by retention <br /> time only by gas chromatography may be confirmed by either a second column <br /> qualitative and quantitative GC analysts, or by GC/MS Currently, no confirmation is <br /> being performed on organic compounds identified by retention time by HPLC, <br /> although the analysts are encouraged to compare those compounds which are detectable <br /> 1 on both UV and Fluorescence detectors <br /> 103 Acceptance Criteria <br /> Acceptance criteria varies with each method and is listed in each individual method <br /> SOP In general <br /> Word 6 0 loeisec l0 doc <br />