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Accuracy.measurements will be carried out at a minimunt fr,tquency of I in 20 or 1 per <br /> _. set, <br /> 4.23 REPRESENTATIVENESS <br /> Representativeness is a measure of how closely the measured results reflect the actual <br /> concentration or distribution of the chemical compounds in the soil sampled. Sampling <br /> — plan design, sampling techniques, and sample dandling protocols (e.g., storage, preser- <br /> vation,and transportation)have been developed and are discussed in Section 3.0 of this <br /> document. Proper documentation will r-.�rablish that protocols have been followed and <br /> sample identification and integrity aspired, Field duplicates obtained at a minimum 10 <br /> percent or one-per-day frequerLy will be used to assess field and transport <br /> contamination and method variation. Laboratory sample retrieval, storage, and han- <br /> dling procedures have also been developed and are discussed in subsequent sections of <br /> this document. Laborator method blanks will be run at the minimum frequency of <br /> 5 percent or one per set ;o assess laboratory contamination, <br /> 4.2.4 COMPLETENESS <br /> Completeness is a rr.,easur►. of the amount of valid data obtained from the analytical <br /> measurement system The quantitative definition of completeness (C) is given below: <br /> C = Number of acceptable data per target QC limits) x 100 <br /> (total number of data points) <br /> The target completeness objective for the overall project will be 90 percent; the actual <br /> completeness for this field program may vary depending on the intrinsic nature of the <br /> samples. The completeness of the data will be assessed during quality control reviews. <br /> 4.2.5 COMPARABILITY <br /> Comparability of the data will be maintained by using EPA-defined procedures where <br /> available. Data comparability will be maintained by using consistent methods and con- <br /> sistent units. Standard units to be used are: <br /> • mg/kg for all analytical results for soil (solid) samples <br /> • mgA for all analytical results for water samples <br /> 4,2.6 DETECTION LIMITS <br /> The detection limits for the various method analyses will be established as the <br /> minimum concentrations that must be accurately and precisely measured by the <br /> laboratory. Consideration will be given for practical limitations such as sample size, <br /> matrix interferences, and dilutions. <br /> A� <br /> sF0316951wP=4-51 4-3 <br /> wig <br /> b„ <br />