REMEDIATION STRATEGY SCREENING & EVALUATION
3-dimensional computer modeling is used to develop more accurate estimates of areas and volumes of impacted soil and groundwater. Technical remediation options are developed for each site. Potential impacts of construction and operation of remedial systems are evaluated with consideration to each facility's on-going operations. Construction schedules, operating, and life cycle costs for remediation projects are prepared for client consideration.
Preliminary engineering designs of remediation systems are evaluated. Ex-situ and in-situ soil and groundwater remediation systems are considered. Innovative biological remediation systems for the treatment of chlorinated organic compounds can be implemented. Final design documents, including schedules and budgets are submitted for approval.
Engineering oversight with construction management assure that the remediation system is constructed in accordance with the project plans and specifications. Internet based Management Information Systems (MIS) provide reliable project data collection and distribution to parties.
RISK BASED REMEDIATION/RISK ASSESSMENT
The Risk-based closure strategy selected is typically dependent on the chemicals and their concentrations, site use constraints, hydrogeology, and remediation costs. Site remediation and closure can proceed using the following approaches.Tier 1-Use default tables in regulations.Tier 2- Use regulatory default equations for cleanup objectives along with site-specific chemical and geotechnical data.Tier 3- Use regulatory default equations for typical exposure pathways and site-specific chemical and geotechnical data. Risk Assessment uses procedures in USEPA guidance documents and site-specific exposure routes, exposed populations, and frequency and duration to calculate acceptable site-specific risk levels.