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{ <br /> i <br /> I <br /> I Sample Description <br /> See the attached Sample Description information. <br /> .he samples were received under chain-of-custody. <br /> II Analysis Description . <br /> The following analytical test was requested. <br /> Lab ID Analysis Description <br /> 052023-1 thru 5 Total Petroleum Hydrocarbons <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 blank associated <br /> with your samples at the reporting limit levels noted on the <br /> €' attached Method Blank Report. <br /> C. LaboratarY Control Samples - The LCS Program <br /> DuoliCate Control Samples. 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 recovery test I - % recovery test 2 z 100 <br /> (% recovery test I + % recovery test 2)/2 <br />