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Enseco <br /> I Sam le Des-criatian w A``­,,C p <br /> See the attached Sample Description Information. <br /> The samples were received under chain-of-custody. <br /> II Anal sis Re nest <br /> The following analytical tests were requested. <br /> ULM__ Anal sis De cri tion <br /> 060854-1 through 7 Total Petroleum Hydrocarbon 0asoii-ne) and BTEX <br /> -8 through 10 Nitrate <br /> lI1 ualit Control <br /> A. Pro'ect S ecific C. No project specific QC (i.e., spikes and/or <br /> duplicates) was requested. <br /> B. Method Blank Results. A method blank is a laboratory-generated <br /> r 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 ware 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. laboratory Control Sales - The_LCS Aroaram <br /> Duplicate 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 concentration) x 100 <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in; <br /> RPD d y r ver to t - Ye recover test 2 <br /> (7. recovery test I + % recovery test 2)/2 x 100 <br /> t;� <br />