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4. Figure B.4.11 Proposed Organization: The specific individuals responsible for managing the project should be indicated in the organization chart. S. Section B.5. 0: This section is confusing. See Chapter 3 in Guidance for Data Useability in Risk Assessment (1990) . Revise the text accordingly. 6. Section B 5. 1.3.1: The heading should read "Data Quality Indicators. " 7. Section B.5.3, Representativeness: The QAPP should describe how representativeness will be measured. It is also not clear why only the representativeness of the analytical data are being considered. Generally, the collection of representative samples in the field is of greater difficulty, and should be addressed. 8. Section B.5.4, Comparability: Normally an objective is not defined for comparability, so the QAPP should describe how comparability will be determined. 9 . Table B-1, Quality Assurance Objectives for Laboratory Analyses: Target analytes and QA objectives should be defined on an analyte specific basis for all the methods in this table. Only those methods that relate (or are expected to relate) to analytes at DDRW-Tracy should be included. Some methods, such as for EPA Methods 8140, 8150, and 632 have analyte lists which include chemicals seldom found with each other. For example, EPA Method 8150 includes ten analytes, but rarely are all ten found in one location because they are used for different applications. In addition to clarifying analytes, the QAPP also needs to remove ambiguity concerning which compounds or analytes will be matrix spike compounds, and what the objectives are for each of them since many differ considerable in their percent recovery ranges. EPA Modified Method 8015 is listed as the analytical method for TPH as gasoline and for TPH as diesel. Are these methods the same? If not they should be referenced in the same table as different. IV-3