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MEW <br /> :. -, xw-"u.09 <br /> F.'r a".-�„rr-., M.`�-t .".' �.-uw n..,u 4 ;e �,, �_ .. �•, <br /> w-:EnsecO <br /> I 5amole pescription <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Anaivsis Request <br /> The following analytical tests were requested. <br /> Lab ID Anal__y sis Descrition <br /> 059500-I thru 4 Sample Composite <br /> "$ Total Petroleum Hydrocarbons and BTEX <br /> Lead <br /> III-- dual itv Contrni <br /> A, Pro'ect S ecific C. No project specific RC (i.e., spikes and/or <br /> duplicates) was requested. <br /> 0- Method Blank Results, A method blank is a laboratory-generated <br /> sample which assesses the degree to whicl, laboratory operations <br /> and procedures cause false-positive ana'.Ytical results for your <br /> samples. <br /> No target parameters were detected in the method blanks associated <br /> with y5ur samples at the reporting limit levels noted on the <br /> attached Method Blank Report. <br /> C. ratory Control Samples - The US Program <br /> Du licate Control Sam les. A DCS is a we]]-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 an the attached Duplicate <br /> Control Sample Report. <br /> Accuracy is measured by Percent Recovery as in: <br /> % recovery = LnLeasqred concentration <br /> (actual concentration) x 10 <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD - recover test I - % recover test 2 <br /> (% recovery test I + % recovery test 2)/2 x 100 <br />