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Third Party Oversight

Former Drycleaner Facility
Denver, Colorado

Services Provided

Market

Trihydro provides expert senior technical support to an insurance company on a claim related to groundwater impacts from a former drycleaner in Denver, Colorado. Tetrachloroethene (PCE) concentrations have been detected in groundwater at concentrations greater than 100,000 ug/L.  Site investigations have determined that PCE impacts are primarily the result of a former dry cleaner that operated on an adjacent property.  PCE impacts have migrated through overburden and fractured rock to beneath a large commercial building owned  by the insured.  PCE in groundwater affects the insured because a pre-existing dewatering system required retrofits to treat PCE prior to discharge, and PCE migration from groundwater into indoor air required installation of a sub-slab depressurization (SSD) system.  

Trihydro’s technical support has encompassed a wide range of technical and regulatory issues.  Trihydro has reviewed the conceptual site model (CSM) presented by the former dry cleaner, including drastic revisions to the hydrogeologic relationship between the former dry cleaner and the insured’s building.  In addition, Trihydro evaluated PCE fate and transport to assess both the former dry cleaner as well as other potential sources contributions to PCE observed beneath the insured’s building. Trihydro has suggested optimization methods  for operation of the SSD and dewatering systems. Lastly, Trihydro has provided expert technical advice relative to the proposed in-situ chemical oxidation (ISCO) remediation system proposed by the former dry cleaners. 
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"The quality of Trihydro's work matches the exemplary nature of the individuals performing them."
- Guillermo J. Silva-Wiscovich, Partner, Morell Bauza Cartagena & Dapena LLC

Trihydro’s success is based on working safely, maintaining high quality, and having strong project managers on the front line. Our considerable technical and regulatory expertise allows us to anticipate challenges, recognize opportunities, and strategically work with you to reach well-defined milestones and clearly defined end-state visions.

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