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5. Evaluation of Matrix Spikes - The results of matrix spikes must meet the acceptance criteria specified by the Contract and listed in the planning document or the data must be appropriately qualified. a. If the failure is reported to be due to sample matrix interference, the laboratory shall document the process by which this conclusion is determined. 6. Evaluation of Laboratory Duplicate/Replicate Samples — All replicate samples (sample duplicates, matrix spike duplicates, LCS duplicates or other replicates) must be evaluated for a precision criterion not to exceed 20 % RPD. This criterion shall be listed in the planning document. a. In the event that laboratory replicate agreement is not observed, the laboratory must investigate the poor precision and report the results with appropriate qualifiers and/or comments. 7. Instrument Calibration — In addition to calibration procedures specified in the analytical methods listed in the planning document, the CONTRACTOR shall ensure that the following requirements are met: a. All sample results shall be chronologically bracketed between acceptable calibration verifications. b. Initial Calibration Requirements (i) The minimum number of calibration standards required to calibrate each instrument used for the contracted analyses shall conform to the analytical method approved in the planning document. If the minimum number of calibration standards is not specified in the method, the number must be specified in the planning document and shall be consistent with the NELAC Chapter 5 standards. (ii) Unless otherwise specified by the method, all sample results shall be based on the initial calibration curve responses. (iii) If linear regressions are used, the correlation coefficient shall be equal to or greater than 0.995 for all regressions. (iv) Immediately after performing an initial calibration, the accuracy of the calibration shall be verified using a second source. A second source may be a standard, a Standard Reference Material (SRM), or other sample type with a verified concentration such as a QC Check Sample. Standards must have been prepared from a different lot or vendor. (v) The acceptance criteria for second -source verifications shall be specified in the planning document. (vi) Sample analysis cannot proceed if an initial calibration is unacceptable. c. Continuing Calibration Requirements: (i) When an initial calibration is not performed on the day of analysis, a continuing calibration standard shall be analyzed, evaluated and determined to be acceptable prior to analyzing samples. (ii) A continuing calibration standard shall be analyzed and evaluated at the end of the analytical run. (iii) The acceptance criteria for continuing calibration verifications shall be specified in the planning document. (iv) For each analytical run, the analytical sensitivity must be evaluated using a continuing calibration standard prepared at the Contract -specified PQL. The analyzed value of this standard must be within 70% — 130% of the expected value. If this PQL check fails, the blank and associated sample results must be reported as "estimated" per Chapter 62-160, F.A.C. unless the affected results are at least 10 times the absolute value of the observed bias of the PQL check. (v) If a continuing calibration verification fails, samples not chronologically bracketed by acceptable calibration verifications must be reanalyzed or appropriately qualified. Revised 1/4/06 DEP Agreement No. G0182, Attachment H, Page 8 of 10