releases and upset conditions to occur as the result of storage or disposal of hazardous materials or wastes during operational phases of the development scenarios would be minimized. Thus, significant impacts related to hazards to the public or the environment through reasonably foreseeable upset or accident conditions involving the release of hazardous materials into the environment will be reduced to a less-than-significant level.
Page 4.G-97 BBCAG-255 [See page 5-141 for the original comment] REVISE the first paragraph on page 4.G-97 to read as follows:
The methane in landfill gases presents an explosion risk at certain concentrations. The methane and the carbon dioxide in landfill gases can also accumulate in confined spaces or low points such as utility vaults or utilities trenches during construction. Because landfill gas is denser than air, it is able to displace oxygen, posing an asphyxiation hazard. Non- methane organic compounds such as TCE, benzene, and vinyl chloride are typically found in very low concentrations in landfill gases, and of these, only benzene has been identified at the former Brisbane landfill which can present a toxic or carcinogenic hazard, or both, above certain concentrations.
Page 4.G-98 BBCAG-177 [See page 5-124 for the original comment] ADD the following text at the bottom of page 4.G-98.
Former Police Shooting Range
The southerly slope of Icehouse Hill was previously used as a police shooting range, and has lead remaining from the leftover shells.
Development of trails along the southerly slope of Icehouse Hill could expose the public to health hazards from those spent shells.
Conclusion: To avoid significant health hazards associated with spent shells from the former police shooting range, implementation of Mitigation Measure 4.G-2i will be required.
Mitigation
Mitigation Measure 4.G-2i: Prior to any construction of trails on the southerly slope of Icehouse Hill, best management practices for lead removal consistent with United States Environmental Protection Agency Circular EPA-902-B-01-001, Best Management Practices for Lead at Outdoor Shooting Ranges, Revised June 2005, shall be implemented.
Conclusion with Mitigation: With implementation of Mitigation Measure 4.G-2i, lead hazard impacts from remaining spent shells from the former police shooting range would be reduced to less than significant.