SITE INFORMATION AND CORRESPONDENCE

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Mr. Marshall Cloud August 12, 2005 Page 2 4) Plate 2, DDJC-Tracy Response Completion Road Map; Similar to comment #3, please update the status of the Natural Attenuation work plan for dieldrin ground water for the northwest corner of the depot. 5) Section 10, FYR Site Inspection Checklist, page D-11; Please remove the circle around Investigative Clusters/"ICs are adequate" and circle "IC are inadequate," since the checklist and regulatory inspection identifies two missing signs. The missing signs are considered one component of the response action, in this case Institutional Controls (ICs), and prevent the remedy from being fully protective as intended. 6) DSERTS 67, FYR Site Inspection Checklist, pages D-12/13, #8; Please amend part VII "Land Fill Covers" to "Cover(s)" for this site and DSERTS 72. The IC sections of the checklist do not provide any descriptors to accurately evaluate the condition of the remedy. Section 8 of the checklist has descriptions for "Ponding" and "Wet Areas," but no information is filled out. According to the date the checklist was filled out on March 2, 2005 and the corresponding site photograph at the front of the checklist, there is clear evidence of standing water creating a wet area. Please amend the checklist to be consistent with the photographic documentation provided. 7) Page 5-8, section 5.5.2, last sentence; This sentence mentions that the western dieldrin plume will be investigated but does not mention when the investigation will take place. Since a work plan has been submitted to and reviewed by regulatory agencies, please insert the anticipated date fieldwork will commence. In addition, there is no mention of the Trichloroethene, Tetracholorethene or dieldrin plumes being offsite and should be discussed in this section. 8) Page 5-6, section 5.3.2, third sentence; Please indicate, in the report, when the Operations and Maintenance Manual will be updated to include the Granular Activated Carbon vessel changeover and the submittal date to the regulatory agencies for review. 9) Section 15, Five-Year Review Checklist, page D-10, part B; During the FYR inspections conducted on March 2, 2005, it was noted that one of the signs was knocked down and wasn't providing the protectiveness as intended in the Record of Decision. Please amend this section to reflect the deficiency in the selected remedy. DTSC recommends correcting this deficiency when repair efforts are mobilized to replace the missing signs at SWMU 7 and DSERTS 72.