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Risk-Based Ranking System for CDOT Salt Pile Facilities. Final rept.
| 题名： | Risk-Based Ranking System for CDOT Salt Pile Facilities. Final rept. |
| 作者： | Johnson-C.; Billig-P.; Khadem-D. |
| 关键词： | *Maintenance-facilities; *Environmental-risks; *Salt-piles.;Colorado-; Maintenance-yards; Sodium-chloride; Contaminated-soils; Concentrations-; Cost-estimates; Risk-based-models; Ground-water; Surface-water; Toxicity-; Remediation-. |
| 摘要： | Many of Colorado Department of Transportation's (CDOT's) 200 maintenance yards are contaminated with sodium chloride (NaCl) after decades of using sand/salt piles that were stored in the yard and exposed to the elements. The current regulatory approach stipulated by CDPHE is to determine a background level of salt in the immediate area and require CDOT to remediate the contaminated soil down to a level that is no more than three times the background concentrations. CDOT recently spent $158,000 excavating the on-site 'contaminated' portion of the maintenance yard at Soda Lakes (on Hampden in Lakewood) and still needs to address the off-site impacts. The estimated cost to remediate up to 200 maintenance yards ranges from $10 million to $40 million. The goal of this research is to produce a preliminary facility ranking system, utilizing a risk-based model, that is protective of human health and the environment for salt contamination in soil, groundwater and surface water. Concurrent and parallel activities are to identify salt toxicity values that are appropriate to the ecosystem and habitat in which a facility is located and to develop an approach to identify and evaluate potential impacts to groundwater that may be used as a drinking water source. The objective is to replace a highly subjective background-based standard for remediation with a risk-based, toxicological approach that is based on sound science and meets statutory requirements. |
| 报告类型： | 科技报告 |
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