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Risk Assessment and Site Closure

Our professionals evaluate site-specific data for naturally occurring and man-made contaminants to target specific concerns to human health. Site-specific data (contaminant levels, how the site is used, potential exposure pathways, etc.) are evaluated to develop a model of the risks these contaminants pose to the property residents or tenants. Specific remedial options can then be evaluated for effectiveness in reducing or removing these exposure pathways, and thereby reducing the site risks to human health.


Stratus professionals use a variety of numerical models to evaluate the effectiveness of treatment options and natural attenuation in removing contaminant mass from a site. These models utilize current and historical site data in conjunction with other predictive approaches (e.g. groundwater modeling) to estimate contaminant removal/reduction rates, and to project likely time frames for reaching remediation goals and water quality objectives.


In addition to numerical models, our experienced environmental technicians also collect soil vapor samples as part of the site closure process.  Samples of vapors are collected from the soil adjacent to and beneath buildings from both temporary or permanent sampling points. The results are used to evaluate the concentrations of contaminants of concern following current US EPA and California Department of Toxic Substances Control protocol. The data can be evaluated with computer-based numerical modes to evaluate the potential and likelihood for these vapors to infiltrate interior building spaces.


We successfully use a variety of tools, in combination with our understanding of site hydrogeologic and geochemical conditions, to gain regulatory approval of cleanup solutions to quickly move sites towards closure.

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