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the reporting limit for each target constituent. If contamination is reported in the either the field or equipment rinsate blanks, data will be qualified as described in the applicable validation procedure. The project goal for accuracy is 90-percent compliance with accuracy criteria. If more than 10 percent of the data are qualified due to failure to meet accuracy criteria, the reasons will be examined and addressed. Initiation of corrective action may be required if laboratory accuracy is determined to be the problem. 3.3 Representativeness Representativeness is defined as an expression of the degree to which the data accurately and precisely represent a characteristic of population, parameter variations at a sampling point, a process or an environmental condition. Representativeness is a qualitative parameter that is primarily controlled by the proper design of the sampling program. The sampling protocol provided in the Workplan and SAP should be designed to collect a statistically valid number and distribution of samples. The members of the field team are responsible for collecting samples representative of the media being sampled following the procedures described in the Workplan and SAP. Representativeness can be assessed by the use of field duplicate samples. Duplicate samples are collected so that the duplicate sample is equally representative of a given point in time and space. Therefore, they measure both precision and representativeness. Representative data will be obtained by following proper and consistent procedures as well as application of approved laboratory-specific SOPS, including any DTSC-approved modifications to the SOPS. Sampling locations will be selected as described in the Workplan's SAP. 3.4 Comparability Comparability is defined as an expression of the confidence with which one data set can be compared to another. Sample data should be comparable with other measurement data for similar samples and sample conditions and to data collected during previous investigations at the Site. Details for achieving this comparability are as follows: • Concentration units will be expressed uniformly for each parameter; • Soil concentrations will be reported on a dry basis in milligrams per kilogram (mg/kg) and micrograms per kilogram (pg/kg); • Soil vapor concentrations will be reported in micrograms per cubic meter(pg/m3); and • Groundwater concentrations will be reported in micrograms per Liter(pg/L). This QA/QC Plan addresses comparability by specifying laboratory methods that are consistent with the current standards of practice as approved by the USEPA. Field methods are discussed in the SAP. The variability associated with the data in terms of precision, accuracy and representativeness will also be evaluated and included as part of the data quality discussion in the QA section of the laboratory analytical report. Quality Assurance/Quality Control Plan Tracy Corners Shopping Center 3225 North Tracy Boulevard Tracy,California 95376 Partner Project Number SM14-129814 Docket Number HAS-VCA 14/15-108 August 15,2016 Page 5