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     Environmental Risk-Assessments are site specific, human health risk assessments that can save money for owners of properties with known or suspected soils or groundwater contamination.  The following are two example projects.

  • Gem Stop Service Stations--LaGrande, Oregon:  Investigations of the petroleum release site involving two adjacent service stations, began in 2002.  Mark Yinger Associates was hired in 2009 to address data gaps the DEQ asked to be addressed.  These petroleum releases were further investigated by Mark Yinger Associates through groundwater and soil sampling of thirteen new borings. 

 A risk-based assessment was then completed by Mark Yinger Associates.   The one human health    exposure risk pathway found was through drinking groundwater.  The impacted properties are connected to the city water system, so this pathway was unlikely to be completed. 

In 2010 the Oregon DEQ proposed, (1) a deed restriction, in the form of an Easement and Equitable Servitude for the two Gem Stop properties to prevent the use of groundwater, and (2) deed notices in the form of a Notice of Environmental Contamination for other properties located within the area of groundwater contamination impact.

  • Industrial Metal Coatings Fascility--Tualatin, Oregon:  A metals coatings facility was issued a consent order by the Oregon DEQ ordering a Focused Remedial Investigation (FRI) of soil and groundwater to assess human and ecological risks (RA)

Mark Yinger Associates was hired to perform the FRI and RA focused on pesticides, pentachlorophenol (PCP), dioxins, petroleum and metals.  Site specific human and ecologic exposure risk were evaluated and maximum contaminant levels proposed.  The exposure risk pathway found was through drinking groundwater.  Restrictions on use of groundwater were filed by the DEQ with Clackamas County.  A conditional No Further Action (NFA) and certificate of completion letter were issued by the DEQ.