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3 <br /> i Sam le Descri tion •°-~-��-�•• <br /> Enseco <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Analysis Request <br /> The following analytical tests were requested. <br /> Lab ID Analysis Description <br /> - 051956-1 thru 3 Total Petroleum Hydrocarbons (Gasoline) and BTEX <br /> Organic Lead <br /> -4 thru 5 Total Coliform <br /> IiI g2pL)J <br /> Jty 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 /> n„ samples. <br /> No target parameters were detected in the method blanks associated <br /> with your samples at the reporting limit levels noted on the <br /> Method Blank Report. <br /> Duplicate Control Sam les. A DCS is a well-characterized matrix <br /> (blank water, sand or ceiite) 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 ;sing duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = % :overy test 1 - % recovery test 21 x 100 <br /> (% recovery test ..1._ %_►^eco.very .test-2)/2---- -- -- - -- --------- ---- ------ -.— -- <br /> k!r . <br />