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18. <br /> 4.6 Labgratory Cluality Assurance <br /> ' Laboratory quality assurance procedures for this study will consist of <br /> blank, recovery, and duplicate determinations. The specific routines which <br /> ' will be followed are outlined below. All samples with apparent chemical <br /> levels exceeding the limit of detection will be confirmed by an appropriate <br /> technique. <br /> 4.6.1 Blanks <br /> Blank determinations will be method blanks to check for solvent <br /> interferences. Between each sample vial , a rinse vial containing the <br /> injection solvent will be inserted to ensure that there is no carryover. <br /> Method blanks will be carried throughout the entire analytical program. <br /> 4.6.2 RecQverie5 <br /> 1 A soil and water sample will be prepared by the laboratory which is free <br /> from chemicals. These samples will be used to demonstrate recovery of <br /> constituents being tested. The recoveries will be run at a level of five <br /> to ten times the limit of detection noted for a particular compound. <br /> 4.6.3 Duplicates <br /> 1 As a check on the precision of the methods employed, approximately 10 <br /> percent of the samples will be analyzed in duplicate. <br /> ' 4.6.4 Confirmation <br /> All samples that show levels of chemicals in excess of the limit of <br /> detection will be appropriately confirmed. <br /> CananieEnvironmental <br />