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: -.$ <br /> Y Y fH� Y C4 F7 Y y <br /> .. fa'Y £i aS.'F:� 9`4.. �. _ TiG-:J1• _ ' K;' (w"N ! mc; g <br /> Tf` <br /> Y <br /> 1:I15cco <br /> l Sam le Descri tion <br /> ' See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> ;I Ana;ysis Request <br /> The following analytical test was requested. <br /> aAb I Anal sis Oestri tion <br /> 059295-1 thru 7 Total Petroleum Hydrocarbons (Gasoline) and BTEX <br /> III ualit Control <br /> A. Prn'ect S ecific C. tlo project specific QC (i .e" spikes and/or <br /> Tu-plicates) 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 blanks associated <br /> with Your samples at the reporting limit levels noted on the <br /> attached Method Blank Report. <br /> C, tabnratar Control Sam les - Thiew LCS Pro ram <br /> qulicate Control Sam les. 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 lo% 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 /> °e recovery = (measured concentration x 100 <br /> (actual concentration] <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = ((% recovery test i - recover test 2} x 100 <br /> (% recovery test 1 % recovery test 2)/2 <br />