Siting the Superconducting Super Collider (1988) / Chapter Skim
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Comments on the Evaluation of Site Proposals
Comments on the Evaluation of Site Proposals
Pages 19-25
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From page 19... ...
. ." GEOLOGY AND TUNNELING Among the geological conditions for SSC construction that the committee considered to be favorable were groundwater table below the tunnel and experimental hall levels; rock or soil with low permeability; uniform rock and soil conditions for the entire tunnel or for long sections; rock or soil soft enough to allow for rapid excavation or tunnel advance rate; rock or soil strong enough to stand without support in the tunnel or in steep, high, open cuts; topography allowing efficient open-cut excavation or placement of the tunnel at relatively 19
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From page 20... ...
that would complicate access or construction or provide recharge for inflows into the tunnel or open excavations; complex rock and soil types with many changes and wide variations in properties; low-strength rock and soil materials (such as loose sands or soft clays) that would require immediate support; hard or abrasive rock; particularly deep tunnels with shafts over a few hundred feet deep caused by topographical features; need for complicated, time-consuming, or highly specialized tunneling procedures to accommodate particular conditions; conditions necessitating slow tunnel advance or open-cut excavation rates; swelling or slaking soil or rock; and highly fractured rock that would require support.
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From page 21... ...
with potential for explosion or toxic effects requiring special lining of tunnel and enhanced ventilation systems; buried valleys; and stresses that could cause rock burst or squeezing ground. REGIONAL RESOURCES The various components of what are called in the ISP "regional resources" are less amenable to detailed technical analysis than are geological conditions.
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From page 22... ...
During the course of the committee's work, there have been numerous newspaper accounts of local opposition and support at a number of sites. In addition, members of the committee and staff received numerous letters, signed petitions, and other supplementary materials from individuals and organized groups, most of them attacking particular proposals.
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From page 23... ...
: critical environments and habitats likely to be disturbed or placed at risk; federally or state designated endangered, threatened, or special interest species significantly disturbed; managed fish or wildlife resources likely to be affected; impacts on surface water resources; impacts on groundwater resources; loss of prime agricultural land; impacts on federal or state recreational, wildlife refuge, fish and game management area, or wilderness area; impacts on historical or archaeological resources; impacts on local topography, stream courses, or scenic resources; impediments to access to gas, oil, coal, or mineral resources; impacts on air quality that could affect ability to attain air quality standards; noise or vibration likely to disturb sensitive human activity or animal populations; possible risks to health or safety from construction or operation of the SSC; and inadequate information about proposed mitigation actions.
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From page 24... ...
Among the regional conditions examined by the committee, noise, vibration, climate, weather conditions, and site-specific land use and activities that might affect construction and operation of the SSC received particular attention. There were some significant differences among the sites -- such as major railroads crossing the proposed collider ring in a few cases, the presence of quarries and other noise and vibration sources at some sites, and severe climate conditions that might affect construction or operation in some locations -- no site was characterized by such negative regional conditions that it could be eliminated on this basis alone.
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From page 25... ...
Since the range of uncertainty was no doubt at least comparable in magnitude, this obviously weakened considerably the committee's ability to distinguish among the site proposals in terms of the costs each could be expected to entail. The narrowness of the range of calculated cost results in part from imperfect ability to foresee future costs, particularly as they would be affected by unforeseeable contingencies.
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