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I Sample D scription <br /> See the attached Sample Description Information. <br /> 1.., The samples were received under chain-of-custody. <br /> II Anal-ysis Repuest <br /> The following analytical test oras requested. <br /> Lab TMJ Analysis Description <br /> 052u23-I thru 5 Total Petroleum Hydrocarbons <br /> III ualit Control <br /> A. EMject Specific Oc. 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 /> samples. <br /> No target parameters .were detected in the method blank associated <br /> with your samples at the reporting limit levels noted on the <br /> attached Method Blank Report. <br /> C. Latorator) Control Sam les - The LCS Proaram <br /> Duplicate Control Sam les_ A DCS is a well-characterized matrix <br /> Flank 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 100 <br /> -f (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = (%o recovery test I - % recover test 2) x 100 <br /> (% recovery test I + % recovery test 2)/2 <br />