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',ioEnseco <br /> A Corning Company <br /> Accuracy is measured by Percent Recovery as in: <br /> recovery = imeasured concentration X 100 <br /> (actual concentration) <br /> i <br /> Precision is measured using duplicate tests by Relative Percent Difference <br /> Ll (RPD) as in: <br /> i <br /> RPD = % recovery test 1 - % recover test 2 x 100 <br /> (% recovery test 1 + % recovery test 2)/2 <br /> Control limits for <br /> accuracy (percent recovery are based on the average, <br /> ) g i <br /> historical percent recovery +/-3 standard deviation units. Control limits <br /> �. for precision (relative percent difference) range from 0 (identical } <br /> duplicate DCS results) to the average, historical relative percent ; <br /> difference + 3 standard deviation units. In cases where there is not <br /> enough historical data, EPA limits or advisory limits are set, with the approval of the Quality Assurance department. <br /> IV Analysis Results <br /> Test methods may include minor modifications of published EPA Methods such <br /> as reporting limits or parameter lists. Reporting limits are adjusted to <br /> reflect dilution of the sample, when appropriate. Solid and waste samples F <br /> are reported on an "as received" basis, i .e. , no correction is made for <br /> moisture content, unless the method requires or the client requests that <br /> such correction be made. <br /> L <br /> Results are on the attached data sheets. <br /> U <br /> 1 <br /> � 1 <br /> % <br />