SITE INFORMATION AND CORRESPONDENCE

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8. Section 3.1.1, Pre-construction Assessment, Page 3-1: The discussion regarding the pre-construction assessment indicates that the type of contaminants present at the project site were determined. Considering that there are soil sample locations (e.g., SL0016, SS086, and SS087) outside the bounds of the AB cover with contaminant concentrations in excess of the ESD's revised cleanup standards, clarify whether the pre-construction assessment considered the determination of concentrations of contaminants, or just the type of contaminants present at DSERTS 67. 9. Section 5.4, Data Quality Assessment,Page 5-2: This section states, "Installation of the DSERTS 67 AB cover did not include analyses of chemical data. A discussion of data quality assessment is not applicable to this remedial action." However, chemical data were collected as part of early site characterization activities (e.g., soil samples SS086 and SS087) and again later during the DDCE at the project site. In fact, the analytical results of the DDCE were reportedly used to justify the reduction in area of the AB cover. In accordance with the RAR Guidance (Close Out Procedures for National Priorities List Sites, January 2000), please provide an assessment of the overall quality of the analytical data, the quality assurance and quality control (QA/QC) procedures followed, the use of a quality assurance project plan (QAPP), and the comparison of analytical data with data quality objectives (DQOs). 10. Section 6.2,Institutional Controls, Page 6-1; and Table 6-1,Summary of Site Institutional Controls Guidelines: Section 6.2 references Table 6-1 for site-specific institutional controls at DSERTS 67, but it is still unclear which DDJC organizations will be responsible for their development, management, implementation, and enforcement. Also, the institutional controls listed in Table 6-1 do not address the potential for an upgrade of the AB cover to asphalt. Please revise the RAR to address these issues. 11. Section 7.0,Post Construction Operations and Maintenance Activities,Page 7-1: The second paragraph indicates that institutional control signs placed around the AB cover should be used to eliminate intrusive activities in the DSERTS 67 area, unless approved by the DDJC Environmental Office or other responsible base office. Since the institutional controls are defined, please revise Section 7.0 to clearly identify any other "responsible base office." 12. Section 9.0, Observations and Lessons Learned, Page 9-1: Section 9.0 discusses the ROD and ESD in general. Without identifying the asphalt cover as the ROD-selected remedial design, the first paragraph states, "The remedial design was prepared and approved in accordance with established regulatory guidelines." Since the asphalt cover is not identified as the ROD-selected remedial design, this statement seems to support the 4