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m. <br /> 4. <br /> Enseco <br /> ' A Caminr Comp ny <br /> I Sample Description <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody, <br /> 11 Anal sis Reauest <br /> .The following a alytical tests were requested. <br /> Lab ID Anal <br /> Asis Description <br /> 057016-1, 2 Total Petroleum Hydrocarbans (Gasoline) and BTEX <br /> III Quality Control <br /> I , A. Project Specific QC. No project specific QC (i.e., sp-kes 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 /> i.r samples. <br /> is <br /> No target parameters were detected in the method blanks associated <br /> I. with your samples at the reporting limit levels noted. on the <br /> Method Blank Report. <br /> C. Laboratory Control Samples - The LCS Program <br /> Duoiicate Control Samples. A DCS is a well-characte,,Izea matrix { <br /> (blank water, sand or celite) which is spiked with certain target <br /> parameters and an;1 yzed at approximately 10% of the camplp. load in <br /> order to establish method-specific control limits. The UCS <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 /> E8 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> S= (RPD) as in: <br /> 2A <br /> RPD .' recovery test,I -_7;_recovery test 21 x 100 <br /> (% recovery test 1 + % recovery test 2)/2 <br /> } <br /> t <br />