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Eseco <br /> A Coming Company <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 /> 062346-1 thru 9 Copper (Dissolved) <br /> Lead (Dissolved) <br /> Total Dissolved Solids, Specific Conductance <br /> III Quality Control <br /> A. Proiect Specific QC. No project specific QC (i :e. , spikes and/or <br /> duplicates) was requested. <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 /> 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 = M recovery test 1 - % recovery test 2) x 100 <br /> (% recovery test 1 + %C recovery test 2)/2 <br /> Control limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-3 standard deviation units. Control limits <br /> for precision (relative percent difference) range from 0 (identical <br /> duplicate DCS results) to the average, historical relative percent <br /> difference + 3 standard deviation units. In cases where there is not <br /> enough historical data, EPA limits or advisory limits are set, with the <br /> approval of the Quality Assurance department. <br />