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�w Enseco <br /> Control limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-3 standard deviation units. Control limits <br /> for precision (relative percent difference) range from 0 (identical <br /> duplicate LCS results) to the average, historical relative percent <br /> difference + 3 standard deviation units. These control limits are updated <br /> on a quarterly basis. In cases where there is not enough historical data, <br /> EPA limits or advisory limits are set, with the approval of the Quality <br /> 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 <br /> are reported on an "as received" basis; i .e. , no correction is made for <br /> moisture content. All data is "blank corrected" by subtracting the level <br /> of contamination, if any, found in the laboratory method blank from the <br /> analytical result before it is reported. <br /> Results are on the attached data sheets. <br />