Proposed High & Low Probability ExcavationsAlternative 5 is the cleanup alternative that is most effective and protective of human health and the environment. It is the only alternative that removes the long-term risk posed by the 4825 Glenbrook Road site by excavating the property (Areas A, B, D, E and F), including the area beneath the house (Area E), to competent saprolite or bedrock; Alternative 5 provides the best long-term solution for minimizing future risk at the site.
… Area A will address any potential World War I related materials that may remain behind the retaining wall in the backyard of the property. If AUES related items, such as munitions and laboratory glassware, are found in Area A, the Army will continue excavating behind the retaining wall until the AUES related waste has been identified and removed.
Historical Sampling at 4825 Glenbrook Road
AU does not consider any remedial alternative other than "Alternative 5, Removing the House and cleaning up to Residential standards with Unrestricted Future Use,” to be acceptable.
... AU has commented repeatedly regarding the arsenic cleanup level of 20 mg/kg and has been repeatedly ignored. While 20 mg/kg may be appropriate as an action level or screening level, it is not appropriate as remedial goal especially at a site where there are so many chemical and toxicological uncertainties in the assessment of the nature and extent of contamination. Even a rough calculation reveals that the residual lifetime cancer risk associated with residential exposure to 20 mg/kg exceeds 5:100,000.
... AU has commented repeatedly regarding the arsenic cleanup level of 20 mg/kg and has been repeatedly ignored. While 20 mg/kg may be appropriate as an action level or screening level, it is not appropriate as remedial goal especially at a site where there are so many chemical and toxicological uncertainties in the assessment of the nature and extent of contamination. Even a rough calculation reveals that the residual lifetime cancer risk associated with residential exposure to 20 mg/kg exceeds 5:100,000.
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