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L <br /> i, <br /> &`'iC'CO <br /> .l Com,n4 l"anF,snv <br /> I Sam le Descri tio <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Analysis Ce uest <br /> The following analytical test was requested. <br /> Lab,jp aull WiLke1_ i <br /> 058175-1 thru E Total Petrolcum Hydrocarbons <br /> III Ouality Control <br /> A. Protect_S—ecifiq QC" No project specific QC (i.e., spikes and/or <br /> duplicates) was requested. <br /> B. Method clank 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 sere detected in the method blanks associated <br /> with your samples at the reporting limit levels noted on the <br /> attached Fethod Blank Report. <br /> C. x.aborator Control Samples- - The LCS Pragran- <br /> OL"pjicate 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 conte i at x 100 <br /> (actual concentration) <br /> P<•ecisior is measured using duplicate tests oy Relative Percent Difference <br /> (RPD) as in: <br /> RPA _% recovery tut_;t - % ret v test <br /> {X recovery test 1 + % recovery test i)/2 x I00 <br />