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the field equipment or trip blanks, data will be qualified as described in the applicable validation procedure. 5.2.3 Representativeness Representativeness is the degree to which data accurately and precisely represent selected characteristics of the media sampled. Representativeness of data collection is addressed by careful preparation of sampling and analysis programs. This QAPP, together with the FSP, addresses representativeness by specifying the numbers and locations of samples; incorporating appropriate sampling methodologies; specifying proper sample collection techniques and decontamination procedures; selecting appropriate laboratory methods to prepare and analyze soil, soil vapor, and groundwater samples; and establishing proper field and laboratory QA/QC procedures. 5.2.4 Comparability Comparability is an expression of confidence with which one data set can be compared to another. The objective of comparability is to verify that data developed during the investigation are comparable to site knowledge and adequately address applicable criteria or standards established by the USEPA and/or California Department of Health Services (DHS). This QAPP addresses comparability by specifying laboratory methods that are consistent with the current standards of practice as approved by the USEPA and DHS. Field methods are discussed in the FSP. 5.2.5 Completeness Completeness is the amount of valid data obtained, compared to the amount that was expected under ideal conditions. The number of valid results divided by the number of possible results, expressed as a percentage, determines the completeness of the data set. The objective for completeness is to recover at least 90 percent of the planned data to support field efforts. The formula for calculation of completeness is as follows: %Completeness = 100 x (number of valid results)/(number of expected results) Environmental/LNC/workplan/Appendix3.wpd 11