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Coming Compam• - <br /> ,_.,� I Sam 1 e Descri tion <br /> y„ See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> ri <br /> II Analysis Re uest <br /> The following analytical test was requested. <br /> Lab ID Analysis Description <br /> 061069-1 thru 4 Sample Composite <br /> My _5 Total Petroleum Hydrocarbons (Gasoline) and BTEX <br /> III buality Control <br /> A. Pro'ect S eci'ric C. 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 wh Ch 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 repotting limit levels noted on the <br /> Method Blank Report. <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 10o <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> - ..._. .. . ... . .. RFD ri test 1 - % recoverI—t—e—st-21 x 100 .. <br /> very test 2) 2 <br /> - <br /> (% recovery test I + /n reco <br />