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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 />048140-1 thru 7 Halogenated Volatile Organics <br />Aromatic Volatile Organics <br />General Inorganics <br />ICP Scan <br />General Minerals <br />Arsenic, Mercury, Selenium <br />III Quality Control <br />A. Project Specific QC. 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 data <br />sheets in the Analytical Results section. <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 />Precision is measured using duplicate tests by Relative Percent Difference <br />(RPD) as in: <br />n <br />u <br />n <br />RPD = (% recovery test 1 - % recovery test 2) x 100 <br />(% recovery test 1 + % recovery test 2)/2 10 <br />