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Diesel Product LIF Investigation, Hydro and Precision Excavation

Soil and Groundwater Contamination Excavation

Location: Dilworth, MN

Client: Class I Railroad Client

The focus of the investigation and remedial efforts have been three primary areas that historically featured locomotive servicing, fueling activities, and impacted soil and surficial groundwater with fuel oil and volatile organic compounds. In addition, the site has featured multiple petroleum USTs and ASTs that contributed to soil and groundwater contamination. EMR completed a remedial investigation using non-traditional laser induced fluorescent methods, UST and AST removals and closure, non-aqueous phase liquid (NAPL) recovery, a feasibility study, and implemented corrective actions and a long-term monitoring program.

 

Subsequent investigations defined the extent of soil and groundwater contamination throughout the site, allowing for focused corrective actions. Due to the hydro-geologic conditions, excavation was selected as the most feasible and effective corrective action. Excavation of the North Fueling Area was completed and removed approximately 4,000 cubic yards of NAPL saturated soil. The excavation was complicated by the proximity of a railroad building, two high-density mainline tracks, and utilities critical to the operation of the facility. Extensive use of soldier pile and lagging shoring allowed for safe excavation of the maximum volume of contaminated soil, while hydro-excavation was utilized to expose and relocate critical utilities. A similar excavation was completed in the Southern Fueling Area, which removed approximately 3,600 cubic yards of fuels-contaminated soil and 300 cubic yards of soil contaminated with lead at hazardous concentrations. Lead-contaminated soils were delineated by EMR during excavation using a NITON XRF and treated to reduce lead leachability.

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