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Case Study #7

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Case Study #7


Remedial Case Study


Chlorinated Solvents including TCE, PCE and vinyl chloride along with fuel oil constituents were identified in several discrete areas at this fire arms manufacturing plant. A dual phase extraction (DPE) system was employed at the property from 1998-2001 under the auspices of a Release Abatement Measure (RAM). Following a significant reduction in contaminant levels, a combined Method 1 & 2 risk assessment was performed, resulting in the determination that a permanent solution had been achieved.


The following assessment activities were performed by LEI to assess the performance of the DPE treatment system and to support a risk evaluation of the improved site conditions:
  • Developed health and safety plan
  • Advanced ~20 soil borings, including several into bedrock, and completed borings as groundwater monitoring wells screened at varying intervals to delineate the vertical extent of impact
  • Collected, field screened, and lab analyzed select soil and groundwater samples
  • Developed groundwater flow model
  • Conducted soil vapor survey and indoor air quality assessment

Response Activities:

A series of integrated response activities were performed to address residual constituents in soil and groundwater. These activities included the following:
  • Supervised the excavation and recycling/disposal of approximately 1,200 tons of soil
  • Maintained and operated DPE system utilizing vapor phase carbon to polish extracted air and glucose/hydrogen peroxide treatment for recovered groundwater. Over 1.6 million gallons of groundwater was recovered, treated and re-circulated during system operation.
  • Performed a combined Method 1 & 2 risk evaluation. Established site specific groundwater standards and employed soil averaging techniques.
  • Submitted a Response Action Outcome concluding that No Further Remedial Actions were needed at this property

Key Monitoring Results:

Current Site Status:

  • Site Closed — No Further Remedial Actions required

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