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Addendum 2 <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 , <br />the <br /> following quality control measures shall be implemented for this Agreement . Note : "Sample" refers to <br /> samples that have been either 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 Agreement are used for matrix spikes , and either laboratory duplicates or matrix spike duplicates . <br /> The laboratory shall analyze these samples : <br /> a . The first time samples from a sample collection matrix (see Table FA 1000- 1 ) are submitted to <br /> the laboratory under this Agreement for analysis . The laboratory shall select one or more of the <br /> received 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 <br /> matrix spike and either laboratory duplicates or matrix spike duplicates shall be composed using <br /> a sample or samples selected from each additional 20 samples of the sample collection matrix <br /> submitted to the laboratory. <br /> c. The last time samples from the sample collection matrix are received and analyzed . The <br /> laboratory shall select one or more of the received samples for use in composition of the matrix <br /> 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 <br /> quantitation limit ( PQL) listed in the planning document, then matrix spike duplicates must be <br /> used . <br /> 2 . Per NELAC Chapter 5 requirements , as least one Laboratory Control Sample ( LCS ; also known as <br /> Laboratory Fortified Blank ) shall be prepared , analyzed and evaluated with each batch of 20 samples <br /> 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 <br /> LCS . If 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 <br /> material (SRM ) or other quality control sample , hereinafter identified collectively as quality control <br /> check samples (QCCS ) , shall be processed with each sample preparation batch and analyzed for <br /> evaluation according to the 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 <br /> by an organization external to the laboratory ; <br /> 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 <br /> organization external to the laboratory . <br /> b . If the QCCS is unacceptable , the samples associated with the QCCS shall be reprocessed with a <br /> new QCCS . If the samples cannot be reprocessed , the data must be appropriately qualified for <br /> all contracted samples in the preparation batch . <br /> 4 . Spiking/Fortification Requirements - All spike fortifications must take place prior to any required <br /> sample preparation steps (e . g . , sample extraction , sample digestion , pH adjustment, etc . ) . The final <br /> concentration of 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 <br /> planning document) , the spiking level must not be greater than 2 times the Agreement-specified <br /> PQL . <br /> b . The concentration of a spiked sample cannot exceed 5 times the highest concentration of any <br /> contracted sample in the preparation batch . <br /> 5 . Evaluation of Matrix Spikes - The results of matrix spikes must meet the acceptance criteria specified <br /> by the Agreement and listed in the planning document or the data must be appropriately qualified . <br /> Revised 3/05 <br /> DEP Agreement No . G0143 , Attachment H, Page 8 of 11 <br />