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Addendum 1 <br /> Quality Control Requirements for Laboratories Performing Chemical Analysis <br /> In addition to the quality control' requirements outlined in Chapter 5 of the NELAC Standards, the following quality <br /> control measures shall be implemented for this Agreement. Note : "Sample" refers to samples that have been either <br /> collected or analyzed under the terms of this Agreement. <br /> 1 . Matrix-Related Quality Control Samples - The GRANTEE shall ensure that samples associated with <br /> this <br /> Agreement are used for matrix spikes, and either laboratory duplicates or matrix spike duplicates. <br /> The <br /> laboratory shall analyze these samples : <br /> a. The first time samples from a sample collection matrix (see Table FA 10004 ) are submitted <br /> to the <br /> laboratory under this Agreement for analysis. The laboratory shall select one or more of the received <br /> samples for use in composition of the matrix spike and duplicates . <br /> b. After the first 20 samples from the sample collection matrix have been analyzed, at least one matrix spike <br /> and either laboratory duplicates or matrix spike duplicates shall be composed using a sample or samples <br /> selected from each additional 20 samples of the sample collection matrix submitted to the laboratory. <br /> c. The last time samples from the sample collection matrix are received and analyzed. The laboratory shall <br /> select one or more of the received samples for use in composition of the matrix spike and duplicates . <br /> d. Spike levels must be at the concentrations specified in item 3 below. <br /> e. If the selected sample concentration is expected to be below the Agreement-specified practical quantitation <br /> limit (PQL) listed in the planning document, then matrix spike duplicates must be used. <br /> 2 . Per NELAC Chapter 5 requirements, as least one Laboratory Control Sample (LCS ; also known as Laboratory <br /> Fortified Blank) shall be prepared, analyzed and evaluated with each batch of 20 samples or less . <br /> a. The acceptance criteria for the LCS shall be specified in the planning document. <br /> b. . If the LCS is unacceptable, the samples associated with the LCS shall be reprocessed with a new LCS . If <br /> the samples cannot be reprocessed, the data must be appropriately qualified. <br /> 3 . For applicable analytes denoted in the planning document, a QC check sample, standard reference material <br /> (SRM) or other quality control sample, hereinafter identified collectively as quality control check samples <br /> (QCCS), shall be processed with each sample preparation batch and analyzed for evaluation according to the <br /> acceptance limits established for the QCCS . <br /> a. Analysis of a QCCS is required for but not limited to the following analyses : <br /> (i) Chlorophyll — the assay for the QCCS or its original formulation shall have been determined by an <br /> organization external to the laboratory ; <br /> (ii) Biochemical oxygen demand (BOD) or carbonaceous BOD (CBOD) — the method-specified <br /> glucose/glutamic acid check solution shall be used; and, <br /> (iii) Copper in seawater — the QCCS shall be any seawater-matrix SRM assayed by an organization <br /> external to the laboratory. <br /> b. If the QCCS is unacceptable, the samples associated with the QCCS shall be reprocessed with a new <br /> QCCS . If the samples cannot be reprocessed, the data must be appropriately qualified for all contracted <br /> samples in the preparation batch. <br /> 4 . Spiking/Fortification Requirements - All spike fortifications must take place prior to any required <br /> sample <br /> preparation steps (e .g. , sample extraction, sample digestion, pH adjustment, etc .). The final concentration of <br /> any spike fortification shall be at the applicable level identified below. <br /> a. If any of the samples in the preparation batch are non-detect (i.e. , below the MDL specified in the planning <br /> document), the spiking level must not be greater than 2 times the Contract-specified PQL. <br /> b. The concentration of a spiked sample cannot exceed 5 times the highest concentration .of any contracted <br /> sample in the preparation batch. <br /> 5 . Evaluation of Matrix Spikes - The results of matrix spikes must meet the acceptance criteria specified by the <br /> Contract and listed in the planning document or the data must be appropriately qualified. <br /> a. If the failure is reported to be due to sample matrix interference, the laboratory shall document the process <br /> by which this conclusion is determined. <br /> 6 . Evaluation of Laboratory Duplicate/Replicate Samples — All replicate samples (sample duplicates, matrix spike <br /> duplicates, LCS duplicates or other replicates) must be evaluated for a precision criterion not to exceed 20 % <br /> RPD . This criterion shall be listed in the planning document. <br /> a. In the event that laboratory replicate agreement is not observed, the laboratory must investigate the poor <br /> precision and report the results with appropriate qualifiers and/or comments. <br /> Revision Date: 02/09 <br /> DEP Agreement No. G0353, Attachment J, Page 6 of 14 <br />