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I Sample Description Emeco <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 /> 047456-1 thru 9 Total Petroleum Hydrocarbons <br /> Benzene, Toluene, Ethyl Benzene and Xylenes <br /> III Quality Control <br /> A. Project Soecific 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 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 /> f (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = (% recovery test 1 - % recovery test 21 x 100 <br /> (% recovery test 1 + % recovery test 2)/2 <br />