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Rte: <br /> •n,.�. �. .-`� :.� ,-fit ,.�, .�: �. <br /> 6 <br /> I Sar.mie Description <br /> See attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Anallsis Request <br /> The following analytical test was requested. <br /> Lab ID Analysis Descri tion <br /> 041243-1 t ru 3 Aromatic Volatile Organics <br /> III Quality Control <br /> A. Project Specific QC. No protect specific QC (i.e., spikes and/or <br /> duplicates) was requested. <br /> 13, Method Blank Results. A method blank is a laboratory-generated <br /> sample w is 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 data <br /> sheets in the Analytical Results section. <br /> C. LaboratorLControl Sanpi__es. An LCS is a well-characterized matrix <br /> 'Fblank 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 LCS <br /> results associated with your samples are on the attached <br /> Laboratory Control Sample Report. <br /> Fi Accuracy is measured by Percent Recovery as in: <br /> % recovery = (measured concentrati-o-i) x 100 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> OM) as in: <br /> RPD = {% recovery test 1 - % recovery test 2 x 100 <br /> (%recovery test 1 f % recovery test/2 <br /> Control limits fcr accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-"s standard deviation units. Control limits <br /> for precision (relative percent difference) range from 0 (identical <br /> duplicate LCS results) to the average, historical relative percent <br /> difference + 3 standard deviation units. These control limits are updated <br /> cn a quarterly basis. <br />