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PIHR-22-1995 18:56 GRADIENT . P.04i06 <br /> • <br /> Calibration Compound Linearity <br /> The relative standard deviation(RSDS) in the initial calibrations and the percent difference(%D) <br /> in the continuing calibrations for tetracliloroethylene,trichloroethylene,and dichloroethylene were <br /> reviewed to assess the accuracy of the results relative to instrument performance. The RSDs and <br /> %Ds for these compounds met the criteria of less than 30%. <br /> Internal Standards <br /> The internal standard (IS) areas and retention times were reviewed to assess the accuracy of the <br /> results relative to instrument performance and specific sample matrix. The IS areas and retention <br /> times met the required criteria with the exception of IS chlorobenzene-d5 in sample analysis <br /> MW4-62 1:10 (12/12/94). Only the positive result for trichloroethylene was reported from this <br /> analysis and thus has been qualified as estimated (7). This result is usable as an estimated value. <br /> Precision <br /> Meld Duplicate Results <br /> Field duplicate samples were reviewed to assess precision of the results relative to field sampling <br /> techniques and the specific sample matrix. Field duplicate sample results are one indicator for <br /> representativeness of the sample aliquot to the area sampled. There were three field duplicate <br /> pairs associated with these samples. <br /> MWI-55 and MWI-DUP <br /> MW5-51 and MW5-DUP <br /> MWII-60 and MWll-DUP <br /> Tetrachloroethylene,trichloroethylene, 1,1-dichloroethylene,cis-l,2-dichloroethylene,and trans- <br /> 1,2-dichloroethylene in these samples were either not detected, qualified by the laboratory as <br /> estimated due to detection at a concentration below the instrument calibration range, or met the <br /> field duplicate precision criterion of less 50 %RPD. Therefore, no further qualification of the <br /> data was required due to field duplicate precision. <br /> Sensitivity <br /> Calibration Compound Response <br /> The relative response factors (RRF) in the initial and continuing calibration standards for <br /> tetrachloroethylene,trichloroethylene, 1,1-dichloroethylene, cis-l,2-dichioroethylene,and trans- <br /> 1,2-dichloroethylene were reviewed to assess the sensitivity of the results relative to instrument <br /> performance. The RRFs for these compounds were acceptable. <br /> g:\projects\dgk950410o.mem 3 Gradient carr,ornnon <br />