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7.0 ANALYTICAL PROCEDURES <br /> The analytical methods used for this project are USEPA-approved methods and are listed in <br /> Table 1. Specific analytical method procedures are detailed in the laboratory QA plan and <br /> standard operating procedures of the selected laboratory. These documents may be reviewed by <br /> Consultant's Project Manager during laboratory audits to verify that project specifications are <br /> met. Laboratory audits are discussed in Section 9.2. The analytical procedures described below <br /> are, conducted by the laboratories. <br /> 7.1 Internal Standards <br /> Internal standards are measured amounts of method-specified compounds added after preparation <br /> or extraction of a sample. Internal standards are added to samples, controls, and blanks in <br /> accordance with method requirements to identify column injection losses, purging losses, or <br /> viscosity effects. <br /> Acceptance limits for internal standard recoveries are set forth in the applicable method. If the <br /> internal standard recovery falls outside of acceptance criteria, the instrument will be checked for <br /> malfunction, and the sample will be reanalyzed 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 (USEPA, <br /> 1996) for applicable analyses of organic compounds. Retention-time windows are used for <br /> qualitative identification of analytes and are calculated based on multiple, replicated analyses of a <br /> respective standard. <br /> Retention-times will be checked on a daily basis. Acceptance criteria for retention-time windows <br /> are established in the referenced method. If the retention time falls outside the respective <br /> Environmental/LNC/Workplan/Appendix3.wpd 18 <br />