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• Enseco <br /> I Sample Description <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Analysis Request <br /> The following analytical tests were requested. <br /> Lab ID Analysis Description <br /> 050447-1 thru 5 pH <br /> Specific Conductance <br /> Total Dissolved Solids <br /> Lead <br /> Hexavalent Chromium <br /> Copper, Nickel <br /> III Quality 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 /> samples. <br /> No target parameters were detected in the method blanks associated <br /> with your samples at the reporting limit levels noted on the <br /> attached Method Blank Report. <br /> C. Laboratory Control Samples - The US Program <br /> Duplicate Control Samples. 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 samples are on the attached Duplicate <br /> Control Sample Report. <br /> Accuracy is measured by Percent Recovery as in: <br /> recovery = (measured concentration) x 100 <br /> (actual concentration) ^ <br />