Contaminated Land Risk Assessment & Remediation Guidance
Assess contaminated land risk and develop regulatory-compliant remediation strategies
by donchitosEnvironmental & SustainabilityEnvironmental ScienceEnvironmental ConsultantContaminated LandWhat You Can Do
You can systematically evaluate soil and groundwater contamination against ASTM E1739 and EPA guidance standards, characterize human and ecological exposure pathways, calculate hazard quotients and carcinogenic risk metrics, and derive remedial action levels (RALs) for regulatory submission. The skill produces defensible risk assessments, exposure scenario documentation, and remediation recommendations that satisfy environmental authority requirements for brownfield redevelopment, industrial property remediation, and legacy contamination sites.
Features
tracks how pollutants move through soil and groundwater to exposure receptors
develops residential, commercial, industrial, and ecological exposure profiles tailored to site reuse plans
computes hazard quotients and carcinogenic risk using EPA methodologies and toxicity reference values
calculates site-specific cleanup standards benchmarked against regulatory thresholds and environmental quality standards
produces defensible reports meeting Phase II ESA, remedial action plan (RAP), and environmental authority submission requirements
evaluates viability of monitored natural attenuation against engineered remediation strategies
develops concentration limits for regulatory approval and environmental compliance
generates technical justifications for remediation decisions and risk conclusions
Example Output
Risk Assessment Summary for Industrial Brownfield Site
Contaminants Identified: TCE (trichloroethylene) in groundwater at 450 µg/L; lead in soil at 2,100 mg/kg
Exposure Pathways:
- Groundwater ingestion (current: industrial, future: residential)
- Soil direct contact and ingestion (residential scenario)
- Vapor intrusion (TCE volatilization)
Risk Calculations:
- Current industrial risk: 2.1 × 10⁻⁵ (acceptable under industrial land use)
- Proposed residential risk: 8.7 × 10⁻⁴ (exceeds 1 × 10⁻⁶ threshold)
Remedial Action Levels Derived:
- Groundwater TCE RAL: 85 µg/L (99% removal required)
- Soil lead RAL: 400 mg/kg for residential scenario
Recommendation: Soil excavation and off-site disposal; groundwater pump-and-treat with air stripper for TCE; institutional controls restricting residential use until RALs achieved.
What's Included
- SKILL.md: Complete contaminated land risk assessment framework and workflow
- Risk Assessment Template: Structured worksheet for contaminant characterization, exposure pathway analysis, and risk quantification
- Exposure Scenario Checklist: Residential, commercial, industrial, and ecological exposure receptors and ingestion/inhalation/dermal pathway parameters
- RAL Calculation Worksheet: Step-by-step derivation of remedial action levels against EPA toxicity reference values and regulatory benchmarks
- Regulatory Compliance Checklist: Phase II ESA, RAP submission, and environmental authority documentation requirements by jurisdiction
Who It's For
- Environmental consultants conducting Phase II ESA investigations and remedial action planning
- Environmental engineers designing remediation systems for contaminated sites
- Brownfield remediation project managers requiring defensible risk assessments
- Environmental compliance officers responding to regulatory notices of violation
- Real estate developers managing contamination liability on industrial property redevelopment
Best For
- Evaluating legacy contamination at manufacturing, mining, and fuel storage facilities
- Deriving cleanup standards for brownfield redevelopment under risk-based regulatory frameworks
- Assessing natural attenuation viability versus active remediation requirements
- Developing exposure scenarios for residential versus commercial/industrial land reuse decisions
- Preparing regulatory-defensible remedial action plans for environmental authority submission
- Characterizing exposure pathways and calculating remedial action levels for multi-contaminant sites
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