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Quality Assurance Project Plan for Removal Action <br /> APN 209-450-03,Mountain House,CA <br /> Page 10 <br /> coolers, the cooler will be appropriately sealed before it is relinquished to the courier. A copy of the <br /> original completed form will be provided by the laboratory along with the report of results. Upon receipt, <br /> the laboratory will inspect the condition of the sample containers and report the information on the chain- <br /> of-custody or similar form. <br /> 7.0 ANALYTICAL PROCEDURES <br /> The analytical methods used for this project are primarily USEPA-approved methods and are listed in <br /> Tables 1 through 3, attached. Specific analytical method procedures are detailed in the laboratory QA <br /> Plan and standard operating procedures of the selected laboratory. The QA staff may review these <br /> documents during laboratory audits to ensure that project specifications are met. Laboratory audits are <br /> discussed in Section 9.2. <br /> 7.1 INTERNAL STANDARDS <br /> Internal standards are measured amounts of method-specified compounds added after preparation, or <br /> extraction, of a sample. Internal standards are added to samples, controls, and blanks in accordance with <br /> method requirements to identify column injection losses,purging losses, or viscosity effects. <br /> Acceptance limits for internal standard recoveries are set forth in the applicable method. If the internal <br /> standard recovery falls outside of acceptance criteria, the instrument will be checked for malfunction and <br /> reanalysis of the sample will be performed after any problems are resolved. <br /> 7.2 RETENTION TIME WINDOWS <br /> Retention time windows will be established as described in SW-846 Method 8000A/B for applicable <br /> analyses of organic compounds. Retention time windows are used for qualitative identification of analytes <br /> and are calculated based on multiple,replicated analyses of a respective standard. <br /> Retention times will be checked on a daily basis. Acceptance criteria for retention time windows are <br /> established in the referenced method. If the retention time falls outside the respective window, actions <br /> will be taken to correct the problem. The instrument must be re-calibrated after any retention time <br /> window failure and the affected samples must be reanalyzed. <br /> 7.3 METHOD DETECTION LIMITS <br /> The method detection limit (MDL) is the minimum concentration of an analyte or compound that can be <br /> measured and reported with 99 percent confidence that the concentration is greater than zero. MDLs are <br /> established for each method, matrix and analyte, and for each instrument used to analyze project samples. <br /> MDLs are derived using the procedures described in 40CFR 136 Appendix B (USEPA, 1990). USEPA <br /> requires that MDLs be established on an annual basis. MDLs must be less than applicable reporting limits <br /> for each target analyte presented in Tables 2 and 3, attached. <br /> 7.4 INSTRUMENT CALIBRATION <br /> Analytical instruments will be calibrated in accordance with the procedures specified in the applicable <br /> method. All analytes that are reported shall be present in the initial and continuing calibrations, and these <br /> calibrations must meet the acceptance criteria specified in the reference method. Records of standard <br /> preparation and instrument calibration will be maintained. Records shall unambiguously trace the <br /> preparation of standards and their use in calibration and quantification of sample results. Calibration <br /> records will be traceable to standard materials as described in Section 5.1.2. <br /> CONDOR <br />