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�• � „7ir� •H� b:.dn ,a� :�^ `� -�.. , mow" yFY�,7.. J ;�� y .t. <br /> ,_!�Et seco <br /> I Sam le Description <br /> �-. See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> i II _ Analysis Request <br /> < The fallowing analytical tests were requested. <br /> Lab ID Analysis Description <br /> 047115-1 thru ib BTEX plus Gasoline <br /> Tetal Petroleum Hydrocarbons <br /> F' <br /> IiI Quality Control <br /> A. Project Specific-OC. No project specific QC (i.e., spikes and/or <br /> -t <br /> duplicates) was requested. <br /> d. Method Blank Results. A method blank is a laboratory-generated <br /> i' sample which assesses the degree to which laboratory operations <br /> and procedures cause false-positive analytical results for your <br /> samples. <br /> x..,9.6 No target parameters were detected in the method blanks associated <br /> with your samples at the reporting limit levels noted on the data <br /> sheets in the Analytical Results section. <br /> C. Laboratory Control -Samples - The LCS pro ram <br /> y <br /> Duplicate Control Sam les. A DCS is a well-characterized matrix <br /> is (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 /> r�o <br /> % recovery = tmeasured concentration x 100 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = % recover test 1 - % recover tent <br /> -- 2) x 100 <br /> (90 recovery test 1 + % recovery test 2)/2 <br /> F � <br />