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9.6 Laboratory Quality Assurance <br /> All samples collected during this project will be analyzed for the selected parameters in <br /> accordance with standard methods found in USEPA manuals, Standard Methods for the <br /> Examination of Water and Wastewater, or other standard accepted methods. <br /> 9.7 Data Validation and Reporting <br /> All raw data collected from project sampling tasks and used in project reports will be <br /> appropriately identified and will be included in a separate appendix within the final report. <br /> Where test data have been reduced, the method of reduction will be described in the report. The <br /> reduction scheme for test results of collected samples will consist of the following tasks: <br /> • Regarding precision: <br /> -Examining replicate samples for differences in inter- and intrasample scatter <br /> -Determining if sampling or analytical error has occurred by comparing scatter of <br /> replicate samples. <br /> -Because of the nature of soil,the variability of contaminant levels detected in replicate <br /> soil samples may be large. In addition, meaningfulness of a given percent variability <br /> depends upon the concentrations detected. For example, 2 ppb and 4 ppb vary by <br /> 100 percent,but the difference may be inconsequential. A 100 percent variance at a <br /> higher concentration, say 100 ppm and 200 ppm, may be of importance. This applies to <br /> both soil and groundwater samples. For these reasons, precise numbers for split <br /> and replicate precision targets cannot be given. <br /> -The design of the sampling plan is biased in that sampling points are located in areas <br /> where contamination is suspected. A wide range of contaminant levels among the <br /> M ain\D:AEnvironmentaI\LN CV\10152007.wpd 66 <br />