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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 /> 051687-1 thru 5 Hexavalent Chromium <br /> pH <br /> Specific Conductance <br /> Total Dissolved Solids <br /> Copper, Lead, 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 /> 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 LCS 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 /> Single Control Samples. An SCS consists of a control matrix that <br /> is spiked with surrogate compounds appropriate to the method being <br /> used. In cases where no surrogate is available, (e.g. metals or <br /> conventional analyses) a single control sample identical to the <br /> DCS serves as the control sample. An SCS is prepared for each <br /> sample lot. Accuracy is calculated identically to the DCS. The <br /> SCS results associated with your samples are on the attached <br /> Single Control Sample Report. <br />