In addition to the assessment services described previously, CONSULTECH provides other assessment services, which are described below:

Hazardous and Non-Hazardous Wastes

• Identification and nature of release
• RCRA facility investigations and corrective measures studies
• Hazardous waste characterization
• Determination of horizontal and vertical extent of soil/groundwater contamination
• Identification of contaminant migration routes

Remedial Investigation

• Soil vapor extraction pilot tests
• Groundwater slug and pump tests
• Groundwater studies
• Air emissions sampling and testing
• Groundwater gradients and velocities
• Permeability and porosity determinations

Risk Assessment

CONSULTECH provides regulatory-accepted calculations/ modeling to evaluate contaminant exposure risks to human health and the environment. The estimated risks are then used to determine site- specific clean-up standards or make an argument that no remediation is required. Regulatory acceptance of "Risk-Based Corrective Action" (or RBCA) varies from one agency to the next. Therefore, we determine the governing agency's level of acceptance before undertaking an RBCA approach.

Clean-up goals for RBCA are determined by two factors:

• Evaluating the toxicity of contaminants, their routes, and their routes' level of exposure. (CONSULTECH keeps abreast of the most recent toxilogical data for contaminants and the latest regulatory-accepted methods for evaluating exposure risk.)
• Determining how the contaminants migrate through soil, groundwater or surface water. (For fate and transport modeling, CONSULTECH evaluates site hydrogeological data and contaminant-specific characteristics to graphically predict contaminant migration and degradation over time.)