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Davis Liquid Waste Superfund Site Soil Remediation

Smithfield, Rhode Island

Services: Remediation
Clients Served: Industrial

The Davis Liquid Waste Site was used during the 1970s to dispose of various types of liquid and solid waste materials. Liquid waste brought to the Site was reportedly dumped into seepage pits. The site was added to the National Priorities List (NPL) of hazardous waste sites in 1983. After years of legal disputes, the Settling Parties signed a Consent Decree with the federal government to remediate all of the soil impacted with total VOCs exceeding 2.0 mg/kg. The ROD required the use of a mobile low-temperature thermal desorption (LTTD) unit using an indirect heat source to remediate the contaminated soil. However, during pre-design testing and equipment selection, numerous concerns arose with this technology due to the physical characteristics of the soil and the presence of intermingled municipal solid waste. Loureiro was asked by the Settling Parties to look at these issues and to evaluate mitigating options. We suggested constructing a containment building designed to meet the requirements of 40CFR265, Subpart DD with a radiant heated concrete floor. This option would perform well regardless of the soil characteristics or the presence of municipal waste. The efficacy of the process was demonstrated through pilot testing and an ESD was submitted to USEPA, subsequently approved, and implemented to accomplish the remediation.


  • Construction of two 30,000 square foot fully enclosed temporary containment buildings with concrete radiant heated floors and an 8,000 square foot support building
  • Installation of mechanical ventilation systems to provide one air change per hour
  • Installation of vapor phase granular activated carbon to remove the VOCs from the extracted air
  • Provision of hot water boiler systems to heat the concrete floors
  • Treatment of approximately 80,000 tons of VOC contaminated soil by spreading the soil over the heated floors and tilling with mechanical equipment
  • Reusing the treated soil on-site to backfill the excavations and reshape the landform
  • Saved the Settling Parties an estimated $6,000,000