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N1 MA1111,111, <br /> iFI15eCo <br /> I Sample Description <br /> '{ See attached Sample Description Information. <br /> c <br /> The sample was received under chain-of-custody. <br /> II- Analysis Re uq est <br /> The 'following analytical tests were requested. <br /> € b 1D Anal sis Descri tion <br /> La <br /> 041508ID Total Petroleum Hydrocarbons <br /> Aromatic volatile Organics <br /> III Quality Control <br /> 1� <br /> A. pro ect S ecific C. No project specific QC (i.e., spikes and/or <br /> duplicates) was requested. <br /> ir+ <br /> B. Method Blank. Results. A method blank is a laboratory-generated <br /> camp a which assesses the degree to which laboratory operations <br /> and procedures cause false-positive analytical results for your <br /> sample. <br /> i j <br /> No target parameters were detected in the method blanks associated <br /> with your sample at the reporting limit levels noted on the data <br /> sheets in the Analytical Results section. <br /> C. Laboratory Control Sam les. An LCS is a well-characterized matrix <br /> �;. (ban,, 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 sample are on the attached Laboratory <br /> tl Control Sample Report. - <br /> Accuracy is measured by Percent Recovery as in: <br /> % recovery = measured concentration x l0O <br /> actual concentration <br /> ifs <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = recover test 1 - % recover testa x 100 <br /> % recovery test 1 + % recovery test 2 /2 <br /> Control limits for accuracy (percent recovery) are based on the average, <br /> — --- -- <br /> percent-recovery +/-3 standard deviation units. Control limits <br /> for precision (relative percent ,difference) range-from 0 identica ----- <br /> ,. duplicate LCS results) to the aerage, historical relative percent <br /> difference + 3 standard deviation units. These control limits are updated <br /> -' on a quarterly basis, <br />