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Section No. 9.0 <br /> Revision No. 6 <br /> Data 6/1/86 <br /> Page 11 <br /> 9.0 INTERNAL QA CHECKS <br /> The quality control program is the most essential element in determining the <br /> pe-formance of the analytical measurements. <br /> The quality control program involves the analysis of a blank, duplicate, and <br /> spiked sample with every set of ten samples of each matrix type extracted per <br /> day. Also, as part of the laboratory Quality Control, the use of the <br />'= surrogates and internal standards are employed where appropriate. To <br /> a` <br /> determine which surrogate or internal standard is 'Lo be used, refer to the <br /> :y.. method's SOP. In Section 13 the use of blind quality control samples is <br /> described. <br /> 1. Analysis of Blanks <br /> There are several different types of blanks that can be <br /> prepared and analyzed; reagent blank, travel blank, or field <br /> blank. <br /> a. A reagent blank is prepared using deiionized seater, purified <br /> soil , solvents, acids, or other reagents used in the <br /> • preparation and analysis of the samples. All analyses are <br /> run using a reagent blank in order to verify that any <br /> positive results are not due to contamination from the <br /> laboratory. Blanks showing contaminatic•n above snininral <br /> detectable levels indicates process contamination that must <br /> be corrected. <br /> CaRloate <br /> F' <br /> h;. <br />