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Control limits for accuracy (percent recovery) are based on the average, <br /> historical percent recovery +/-3 standard deviation units. Control limits <br /> fes , for precision (relative percent difference) range from C (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 /> approval of the Quality Assurance department. <br /> IV Analysis Pesults <br /> Test methods may include minor modifications of published EPA Methods such <br /> as reporting limits or parameter, lists. Reporting limits ara adjusted to <br /> reflect dilution of the sample, when appropriate. Solid and waste samples <br /> are reported on "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 he made. <br /> Results are on the attached data sheet. <br />