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ERMW <br /> f <br /> EXISeco <br /> �•Y <br /> ...._d.r <br /> I Sam 1e Oescrintion <br /> See the attached Sample Description information. <br /> The samples were received under chain-of-custody. <br /> II Analysis Re nest <br /> The following analytical tests were requested. <br /> Lab ID <br /> Analysis Description <br /> 051956-1 thru 3 Total Petroleum Hydrocarbons (Gasoline) and BTEX <br /> Organic Lead <br /> -4 thru 5 Total Coliform <br /> . III Quality Control ikes and/or <br /> A. Pro'ect Soecific C. No project specific QC (i.e., sp <br /> duplicates) 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 deoring <br /> with your samples at the rep 3imtelevels dnntedkonathe <br /> c�ated <br /> + Method Blank Report. <br /> Ou licate Cantrol samples., A DCS is a well <br /> aractwith erizedinmatrix <br /> (blank water, sand or cel', a rloximatelyich is p10% of the sample load in <br /> parameters and analyzed at app <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 /> measured concentrztian x 100 <br /> J° recovery = i <br /> (actual concentration) <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPO °J° recover test I - °� recover test 2 x lOD <br /> (% recovery test 1 + °l° recovery test 2}/2 <br /> I <br />