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{ <br /> Enseco <br /> ! A Coming Company <br /> Accuracy is measured by Percent Recovery as in: <br /> recovery measured concentration x 100 ,l i <br /> (actual concentration) ' <br /> Precision is measured using duplicate tests by Relative Percent Difference i <br /> (RPD) as in: <br /> RPD = ( recovery test 1 -. % recovery test 2) x 100 d <br /> (% recovery test 1 + % recovery test 2)/2 <br /> t <br /> Control limits for accuracy (percent recovery) are based on the 'ai verage, <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 /> i enough historical data, EPA limits or advisory limits are set, wilth the <br /> 4 approval of the Quality Assurance department. J <br /> IV Analysis Results i <br /> Test methods may include minor modifications of published EPA Methods such <br /> as reporting limits or parameter lists. Reporting limits are ad3usted to <br /> reflect dilution of the sample, when appropriate. Solid and waste samples <br /> i <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 /> Results are on the attached data sheets. <br /> f <br /> I <br /> I <br /> i <br /> j <br /> I <br /> I <br /> I <br /> i <br /> i <br /> I� <br /> 3 <br /> I <br />