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Superfund Record of Decision (EPA Region 8): Union Pacific Railroad Laramie Tie Treating Plant, Laramie, Wyoming, September 1986

机译:超级基金决策记录(Epa区域8):联合太平洋铁路拉勒米领带处理厂,怀俄明州拉勒米,1986年9月

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The Union Pacific Railroad (UPRR) Tie Treating Plant is located southwest of Laramie, Wyoming. Wood preserving agents used by UPRR or its contractor included: zinc chloride, a creosote oil and asphalt-based petroleum/residuum oil mixture, PCP. Process wastes were disposed of in the Laramie Waste Collection ponds. Currently, 140 acres are contaminated. The contamination ranges from soil saturated with free oil to ground water containing dissolved contaminants. The selected interim source control remedy is a Contaminant Isolation System which includes: realignment of the Laramie River channel; a soil-bentonite slurry barrier wall constructed through the alluvium and bedrock around the contaminated areas; a reverse-gradient ground water draining and pumping system; an activated carbon water treatment plant. The treated water will be discharged to the Laramie River under the authority of an NPDES permit issued and administered by the State of Wyoming; and ground water monitoring.

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