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Yi <br /> �,WE AS <br /> -1 <br /> 4.6 DATA VALIDATION AND IZEPORTING <br /> All raw data collected from project sampling tasks and used <br /> in project reports will be appropriately identified and will be <br /> included in a separated appendix within the final report. where <br /> test data have been reduced, the method of reduction will be <br /> described in the report. <br /> The reduction scheme for test results of collected samples <br /> will consist of the following: <br /> Regarding precision: <br /> o Examination of split and replicate samples for <br /> differences in inter- and intra-sample scatter. <br /> o Determination if sampling or analytical error has <br /> occurred by comparing scatter of split and replicate <br /> samples. Meaningfulness of a given percent variability <br /> depends upon the concentrations detected. For example, <br /> 2 ppb and 4 ppb vary by 100 percent, but the difference <br /> may be insignificant. A 100 percent <br /> variation at a <br /> v_ higher concentration, say 100 ppm end 300 ppm, may be of <br /> importance. This applies to both soil and ground water <br /> samples. For these reasons, precise numbers for split <br /> and replicated precision targets cariiiot be given. <br /> o The design of the sampling plana is biased in that <br /> sampling points are located in are.-is where contamination <br /> i5 suspected. A wide range of. contaminant .levels among <br /> the sampling points is likely. Examining the scatter of <br /> ^' data from various locations, therefore, is not a <br /> meaningful method to determine data validity. The data <br /> will be reviewed and apparent abnormalities (e.g., <br /> .� unexpected order-of--magnitude differences among samples) <br /> will be investigated by reviewing sampling procedures and <br /> laboratory QC results. <br /> Regarding completeness: <br /> o Computation of , the fraction oE measurement data that <br /> remain valid after identifying any data of questionable <br /> accuracy or precision. <br /> o Assessment of the completeness on the basis :.f numbers. <br /> of valid samples and distribution of sites at which valid <br /> samples were` taken. The completeness target is 80 <br /> percent valid soils samples, and 55 percent valid ground <br /> T water samples. If actual completeness is less than the <br /> target, an assessment will be made as to whether enough <br /> data have been generated to close existing data gaps. <br /> LDO1_364 <br /> 15 <br />