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ect1Cn NC. <br />F a ce of <br />-Spred-Semple Preparation (water); <br />Water samples will be spiked by the addition C a knr—wn quantity <br />of analyte to a known quantity of a;e;_, sa^•.zle. <br />When So1L:ions are used for the spiking process, the solvent must <br />be rnisc9_'e with .P:t :a,rr;pie Lein^ _ a <br />V _p e <br />When or-,Ie-ic solvents are used, the vrlume-of the spiking solvent <br />will be e.ept to a minimum to prevent undue alteration of the <br />eauecus ch®racter of the final solution. <br />"'hen spii-'ng natural water soIutior,!, the concentration of tre <br />analyte it:i belly present must D known so that the fine! <br />concentration of the spiked sampl a wi l l : e i-) a s u i tar ie rano` <br />for the e-.elytiCal method. <br />Spiked Semple Preparation (soil /sediment ); <br />Soil and sediment samples will be =piked by the addition of a <br />known quentity of analyte to a known cuantity Cf soil. Spiking is <br />accomplisr.ed by completely wetting the sample with a solution of <br />the analyte. <br />Data from these control samples will be used to update precision <br />and accuracy information to refine the detection limits of each <br />method. <br />Periodic b-iind quality control check samples are an important <br />part of the QA program; their use helps to ensure quality of data <br />and adherence to protocol. These samples are su`mitted monthly by <br />the QA Officer. <br />