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- Resampling and analyzing. <br /> Evaluating and amending sampling and analytical procedures. <br /> Accepting data and acknowledging level of uncertainty. <br /> 4.3.2.2 Laboratory Activities. Once the samples are received at the <br /> contract laboratories under custody procedures, the responsibility for <br /> producing credible sample data will shift to the laboratory personnel. The <br /> involvement of the field investigation staff in the laboratory analytical <br /> quality control will be one of overview to insure that acceptable <br /> procedures are being utilized and that the data being reported is within <br /> reasonable limits of acceptability. This overview function will consist of <br /> the following: <br /> o Selection of certified laboratories acceptable to the regulatory <br /> agencies. <br /> o Review of proposed analytical procedures to ensure they comply with <br /> the CAM documents. <br /> o Periodic review of the laboratories' internal QC data to verify <br /> that acceptable precision and accuracy envelopes are being <br /> maintained around the MCTC data base. <br /> o Review of all sample data generated by the contract laboratories as <br /> to "apparent" reliability and to minimize data reporting errors <br /> that might otherwise appear as erroneous data. <br /> As mentioned in Section 8.1, the selected laboratories will be certified by <br /> the State of California DOHS' Hazardous Materials Laboratory. Such <br /> certified laboratories maintain rigid in-house QA/QC programs. These <br /> in-house programs are designed to ensure the data they report are precise <br /> (i.e. they can be reproduced repeatedly for a given sample) and that the <br /> analytical procedures are relatively free of systematic bias (i.e. , that <br /> the data reported are reasonably accurate representations of the <br /> A-3 <br />