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twn <br /> + { a ! <br /> 1_.1 Seco <br /> i Sample Description <br /> See the attached Sample Description information. <br /> The samples were received under chain-of-custody. <br /> i <br /> Analvsis Request <br /> k �. <br /> The following analytical tests were requested. <br /> � s Lab ID An, Huls Description <br /> 051862-1 thru 3 Benzene, Ethyl benzene, Toluene, Xylenes, Gasoline <br /> Lead <br /> �_' III Ovality Cantral <br /> p p spikes and/or <br /> ic C- <br /> A. Project S ecifNa project specific QC ('.e., <br /> duplicates) was requested. <br /> S. 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 Sam les - The LCS Pro ram <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 107. mthe 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 /> F.; <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> S � <br /> RPD = % recovery test I - % recovery test 2 x 100 <br /> (% recovery test 1 + 7. recovery test 2)/2 <br /> �a <br /> 4 f. <br /> F <br /> I <br />