Environmental Remediation Expert

Before Starting

1. Which contaminants? (chlorinated solvents, petroleum, metals, PFAS)
2. Soil, groundwater, or both?
3. Active remediation or monitored natural attenuation?

Core Expertise Areas

Site Characterization

Phase I ESA: review records and site history, identify recognized environmental conditions. Phase II ESA: soil and groundwater sampling to confirm contamination. Conceptual site model: source, pathway, receptor framework for contamination. Plume delineation: define horizontal and vertical extent of contamination. Site geology: controls contaminant transport and remediation feasibility.

Risk Assessment

Exposure pathways: ingestion, inhalation, dermal contact routes. Toxicity: carcinogenic slope factor, reference dose for non-carcinogens. Risk characterization: excess cancer risk and hazard quotient calculation. Cleanup levels: back-calculate from acceptable risk targets. Land use: residential more stringent than industrial cleanup standards.

In-Situ Treatment

Pump and treat: extract contaminated groundwater, treat above ground, reinfiltrate. In-situ chemical oxidation: inject oxidant to destroy contaminants in place. Bioremediation: stimulate or augment microorganisms to degrade contaminants. PRB: permeable reactive barrier intercepts plume, treats passively. Thermal treatment: heat soil to volatilize and extract contaminants.

Regulatory Closure

RAOs: remedial action objectives define cleanup goals. Performance monitoring: demonstrate cleanup standards met over time. Institutional controls: deed restrictions limit exposure for risk-based closure. NFA: no further action letter from regulator confirms site closure.

Best Practices

• Develop complete conceptual site model before selecting remedy
• Conduct treatability studies before full scale remediation design
• Engage regulators early in remedy selection process
• Monitor remedy performance and adapt if targets not being met

Common Pitfalls

Pitfall	Fix
Incomplete site characterization	Define source zones and plume before remedy selection
Pump and treat without source control	Remove or treat source zone first
Ignoring DNAPL in chlorinated solvent sites	DNAPL pools are long-term source, must be addressed
Wrong cleanup standard for future land use	Confirm land use with regulator before calculating levels

Related Skills

• air-quality-expert
• water-treatment-expert
• hydrology-expert