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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 following quality control measures shall be implemented for this Contract. Note: "Sample" <br />refers to samples that have been either collected or analyzed under the terms of this Contract. <br />1. Matrix -Related Quality Control Samples - The CONTRACTOR shall ensure that samples <br />associated with this Contract are used for matrix spikes, and either laboratory duplicates or <br />matrix spike duplicates The laboratory shall analyze these samples: <br />a. The first time samples from a sample collection matrix (see Table FA 1000-1) are <br />submitted to the laboratory under this Contract for analysis. The laboratory shall select <br />one or more of the received samples for use in composition of the matrix spike and <br />duplicates <br />b. After the first 20 samples from the sample collection matrix have been analyzed at least <br />one matrix spike and either laboratory duplicates or matrix spike duplicates shall be <br />composed using a sample or samples selected from each additional 20 samples of the <br />sample collection matrix 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 <br />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 Contract specified <br />practical quantitation limit (PQL) listed in the planning document, then matrix spike <br />duplicates must be used. <br />2. Per NELAC Chapter 5 requirements as least one Laboratory Control Sample (LCS; also <br />known as Laboratory Fortified Blank) shall be prepared, analyzed and evaluated with each <br />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 <br />with a new LCS. If the samples cannot be reprocessed, the data must be appropriately <br />qualified. <br />3. For applicable analytes denoted in the planning document, a QC check sample, standard <br />reference material (SRM) or other quality control sample, hereinafter identified collectively <br />as quality control check samples (QCCS), shall be processed with each sample preparation <br />batch and analyzed for evaluation according to the acceptance limits established for the <br />QCCS. <br />a. Analysis of a QCCS is required for but not limited to the following analyses: <br />(1) Chlorophyll — the assay for the QCCS or its original formulation shall have been <br />determined by an organization external to the laboratory ; <br />(ii) Biochemical oxygen demand (BOD) or carbonaceous BOD (CBOD) — the <br />method -specified glucose/glutamic acid check solution shall be used; and, <br />(iii) Copper in seawater — the QCCS shall be any seawater -matrix SRM assayed by <br />an organization external to the laboratory. <br />b. If the QCCS is unacceptable the samples associated with the QCCS shall be <br />reprocessed with a new QCCS. If the samples cannot be reprocessed, the data must be <br />appropriately qualified for all contracted samples in the preparation batch <br />4. Spiking/Fortification Requirements - All spike fortifications must take place prior to any <br />required sample preparation steps (e.g., sample extraction, sample digestion, pH <br />adjustment, etc.) The final concentration of any spike fortification shall be at the applicable <br />level identified below. <br />DEP Agreement No. LP###, Attachment H, Page 9 of 12 <br />