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W <br /> ci = measured concentration analyzed in the sample after adding the spike <br /> (mfg) <br /> or, on a percentage basis: <br /> %R = (c1 - co)100J(c, x vs x 10-3) <br /> Accuracy measurements will be carried out at a minimum frequency of 1 in 20 or 1 per <br /> set. <br /> 4.23 REPRESENTATIVENESS <br /> Representativeness is rd 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 handling protocols (e.g., storage, preser- <br /> vation, and transportation) have been developed and are discussed in Section 3 of this <br /> document. Proper documentation will establish that protocols have been followed and <br /> sample identification and integrity assured. Field duplicates obtained at a minimum 10 <br /> percent or one-per-day frequency will be used to assess field and transport contamina- <br /> tion and method variation. Laboratory sample retrieval, storage, and handling proce- <br /> dures have also been developed and are discussed in subsequent sections of this docu- <br /> ment. Laboratory method blanks will be run at the minimum frequency of 5 percent or <br /> one per set to assess laboratory contamination:. <br /> 4.2.4 COMPLETENESS <br /> Completeness is a measure 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 /> Ik.. • <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 €r.r soil (solid) samples <br /> 6- mg/l for all analytical results for water.samples <br /> 5F0316041wP1004.51 t-3 <br />