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'01/03/2008 15:18 209835OG25 Valley Organics, Iric. Green Waste Composting Facility, Lathrop, CA WORKPLAN FOR WELL RADIUS SEARCH AND GROUNDWATER SAMPLING 2098350675 PAGE 10 8112.000.000 December 4, 2007 Page 6 The overall quality assurance objective for measurement data is to provide that the data generated .is of documented quality and acceptable for the intended data uses. The intended use of the data to be generated during this sampling is characterization of underlying groundwater quality. In order for data to meet this intended use, it must be (1) representative of actual site physical and chemical conditions, (2) comparable to previous and subsequent data and other, studies, (3) complete to the extent that necessary conclusions may be reached, and (4) of known quantitative statistical significance in terms of precision and accuracy at levels appropriate for the intended use of the data. Precision will be evaluated in this study by matrix spike duplicates, method blank samples. The Workplan targets 100 percent data completeness; however, some loss may be expected due to laboratory error, insufficient sample volume, or samples broker) in shipping. In most cases, a minimum of 90 percent data completeness should be expected. The laboratory should ensure that data reported is precise and accurate. The precision of data is a measure of the reproducibility of the measurement when an analysis is repeated. It is reported in Relative Percent Difference (RPT) or Relative Standard Deviation (RSD). The accuracy of an analysis is a measure of how much of the constituent actually present is determined. It is reported as percent recovery. Laboratory data should be reported in standard units. To ensure samples are analyzed in a consistent manner. Laboratory staff must demonstrate proficiency in all the required laboratory activities that they conduct. A summary report will be prepared at the conclusion of the well -radius search and groundwater sampling. The report will contain a summary of test results as presented by the laboratory in standard units, Deviations from standard operating procedures, sample handling, etc. will be reported in the suunmary. The sampling report; will contain the following information: • GcneralInformation: 0 Purpose of the project. o Brief descriptions of the local geology and hydrogeology, including descriptions of subsurface conditions encountered as obtained from the well radius search. o Topographic Waal) also showing cultural features. o Detailed scaled site layout,