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%Enseco <br /> A Comtng Company <br /> . Sample Description <br /> See the attached Sample Description Information. <br /> The sample was received under chain-of-custody. <br /> 11 Analysis Reguest <br /> The following analytical test was requested. <br /> Lab ID Analysis Description <br /> 059653-0001 Nickel <br /> III Ouality Control <br /> A. Project Specific OC. No project specific QC (i .e. , spikes and/or <br /> duplicates) was requested. <br /> B. Method Blank Results. A method blank is a laboratory-generated <br /> sample which assesses the degree to which laboratory operations <br /> and procedures cause false-positive analytical results for your <br /> sample. <br /> • No target parameters were detected in the method blank associated <br /> with your sample at the reporting limit levels noted on the <br /> attached Method Blank Report. <br /> C. Laboratory Control Samples - The LCS Program <br /> Duplicate Control Sam les. A DCS is a well -characterized matrix <br /> (blank water, sand or celite) which is spiked with certain target <br /> parameters and analyzed at approximately 10% of the sample load in <br /> order to establish method-specific control limits. The DCS <br /> results associated with your sample are on the attached Duplicate <br /> Control Sample Report. <br /> 1 Accuracy is measured by Percent Recovery as in: <br /> % recovery = „(measured concentration) x 100 <br /> _ (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD % recovery test 1 - % recover test-_U x 100 <br /> (% recovery test I + % recovery test 2)/2 <br /> M <br />