pages: AlamedaReuseandRedevelopmentAuthority/2011-11-02.pdf, 6
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AlamedaReuseandRedevelopmentAuthority | 2011-11-02 | 6 | Response to Comments on Status Update for the ARRA Alameda Reuse and Redevelopment Authority Meeting - November 2, 2011 Time Comment Marker Response there are Proposed Plans, RODs, and Work Plans. So a lot of it doesn't have those in place yet, but they're put in the active cleanup column.) 36:46 The presentation (Slide 15) indicated portions of the The IR Site boundaries on Slide 15 accurately reflect the Northwest Territories are white (outside of IR Sites). But BCT's current understanding of the extent of radium in soil most of these areas have recently been found to have radium at Northwest Territories. Within the last few years, the contamination in soil. There is no plan for remediation of boundaries of the site in the area the comment references this contamination. (IR Site 32) were expanded to account for low-level radium contamination in soil extending over a greater area than was (Full Comment: The map showed the Northwest Territories originally recognized. The Navy is currently completing an to be white, but they have recently been found to be covered extensive radiological survey of soil in this area. The with radium to a depth of a half foot to a foot and a half, as I preliminary results from this investigation indicate that the recall, in most of it. And there has been no plan as to how extent of radium in soil does not extend beyond the current that's going to be remediated, as far as we know.) IR Site boundaries (into the white areas shown on Slide 15). 37:09 Natural attenuation hasn't occurred for 60 years. Why expect Natural attenuation consists of a variety of natural processes it to occur in the next five or ten years? that reduce contaminant concentrations over time, usually relatively slowly: biochemical degradation, dispersion, (Full Comment: And one of, George Humphries, who is my volatilization, etc. These are commonly effective in cohort in this battle, likes to point out that natural attenuation reducing contaminant concentrations to remedial goals after hasn't occurred for 60 years. Why do you think it's going to the initial active-cleanup phase. occur in the next five or ten years?) A fundamental component of the monitored natural attenuation part of a clean-up alternative is ongoing groundwater sampling and analysis to verify that contaminant concentrations drop as expected. If the levels do not drop, CERCLA requires that the ROD be changed to ensure clean-up goals are achieved. More technical response: Two factors support the expectation that natural attenuation will work well after active remediation. Page 4 of 4 November 7, 2011 | AlamedaReuseandRedevelopmentAuthority/2011-11-02.pdf |