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Site-Specific Health and Safety Plan (HASP) - Laschools.org

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SECTION 7<br />

LABORATORY QC SAMPLES AND CRITERIA<br />

Laboratory QC data are necessary to determine the precision <strong>and</strong> accuracy of the<br />

analyses, confirm matrix interferences, <strong>and</strong> demonstrate target compound contamination<br />

of sample results. QC samples will be analyzed routinely by the analytical laboratory as<br />

part of the method QC procedures. The contract laboratory Quality Assurance Program<br />

Manual (QAPM) describes its QA system. At a minimum, the laboratory must prepare<br />

<strong>and</strong> analyze a method blank, a laboratory control sample (LCS), a laboratory sample<br />

duplicate, <strong>and</strong> a continuing calibration st<strong>and</strong>ard with each batch of samples. A matrix<br />

spike/matrix spike duplicate (MS/MSD) shall be analyzed with each batch, providing<br />

sufficient sample was provided to the laboratory by the sampling team. If there is not<br />

sufficient sample for MS/MSD, the laboratory will prepare <strong>and</strong> analyze the LCS in<br />

duplicate. In this manner, a measure of the precision pertaining to the specific analytical<br />

batch can be determined.<br />

7-1<br />

K:\Depts\Dept48\LAUSD\MSA WORK\QAPP\Draft Final QAPP to DTSC\QAPP for OU 1 RAP.DOC<br />

316

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