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MM <br /> agrg <br /> NEW <br /> •�' WEM-lZME <br /> �: y J� � Y•";'.,rs,+r <br /> �r <br /> �rT <br /> 1 <br /> -E <br /> Enseco <br /> I Sample Description <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Analysis Rest <br /> The following analytical test was requested. <br /> Lab 1'D Analysis Descri tion <br /> 059403-1 thru 12 Total Petroleum Hydrocarbons <br /> III Ouality Control <br /> A. Project Specific OC. 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 levals noted on the data <br /> sheets in the Method Blank Report. <br /> C. Laboratory Control Samples - The LCS Program <br /> Du licate Control __Samples, A DCS is a well-charzcterized 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 /> % recevery a measured concentration x 100 <br /> (actual concentration) <br /> Precision is meascrcd using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD a 96 rgcovery test 1 - recovery test 2) x 100 <br /> (% recovery test 1 t % recovery test 2)/2 <br />