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Enseco <br /> L A Coming Company <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 DCS results) to the average, historical relative percent <br /> i 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 /> approval of the Quality Assurance department. <br /> IV Analysis zs Results <br /> Test methods may include minor modif cations of published EPA Methods such <br /> as reporting limits or parameter lists. Reporting limits are adjusted to <br /> reflect dilution of the sample, when iappropriate. Solid and waste samples <br /> are reported on an "as received" basis; i .e. , no correction isImade 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 />