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.� r� � Aft .� d � '� �'r +d -ws 4�`"•^A '. 1F <br /> 9 <br /> :Enseco <br /> • c rf .:c,�r,R cam�uny <br /> �~ Precision is measured using duplicate tests by Relative Percent Difference <br /> (RPD) as in: <br /> RPD = q recovery test 1 - % recover test 2 x 100 <br /> {% recovery test 1 + X recovery test 2)/2 <br /> Control limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery t/-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 <br /> t approval of the Quality Assurance departmcnt. <br /> i .. <br /> IV Anal sis Results <br /> E . <br /> Test methods may include minor modifications of published EPA Methods such <br /> R � as reporting limits or parameter lists. Reporting limits are adjusted to <br /> s- reflect dilution of the sample, when appropriate. Solid and waste samples <br /> are reported on an "as received" basis; i.e., no correction is rade for <br /> iA moisture Content, unless the method requires or the client requests that <br /> such correction be made. <br /> Results are oa the attached data sheets., <br /> t <br /> 2 � <br /> 14 <br /> i9 <br /> i <br /> E'. F <br /> N+ <br /> M <br />