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® �. 1 - sem. <br /> ;Enseco <br /> A Coming Cnm{any <br /> i GB <br /> r 1 Sampit_Descri-ti <br /> 0 <br /> r �� <br /> ' <br /> Sea the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> f <br /> 1I Analysis Request <br /> F - _ <br /> z The following analytical tests were requested. <br /> i Lab ID Anal sis Description <br /> 057007-1 thru 3 Total Petroleum Hydrocarbons <br /> Total Petroleum Hydrocarbons (Gasoline) and BTEX <br /> F <br /> III Quality Control <br /> A. Project Specific Oc. No project specific qC (i.e., spikes sand/or <br /> duplicates) was requested. <br /> 5 I t <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 /> f samples. <br /> ..._ No target parameters were detected in the method blanks associated <br /> � = wtti, your samples at the reporting liiit levels noted on the <br /> Method blank Report. <br /> ' C. LaboratorK Control Sam les - The LCS Program <br /> DuO icate Control Samples A DCS is a ;yell-characterized matrix ?` <br /> (blank water, send or celite) which is spiked with certain target <br /> }� parameters and aialyzed at apprcximately 10%' of the sample load in <br /> order to establish method-specific cor.;rol limits. The DCS <br /> I = results asssLiated with your samples are on the attached Duplicate <br /> Control Sample Report. <br /> Accuracy is measured by Percent Recovery as in: <br /> xxS recovery = Imeasured concentration x 100 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = ( recover test est 1 - recovery-test_ax 100 <br /> recovery test 1 t y recovery test 2)/2 <br /> F <br /> 'I <br />