Site assessment reveals persistent petroleum contamination in soil and groundwater after remediation, indicating that ignoring hydrogeological conditions impedes cleanup.
Key Points
To evaluate the completeness and efficacy of response and restoration measures following an engine oil spill at a warehouse complex and to establish recommendations for remaining environmental risks.
Conducted a reconnaissance site survey with visual inspection of residual contamination across the warehouse complex.
Reviewed design and technological liquidation decisions against geological, hydrological, and hydrogeological site characteristics.
Collected soil and water samples across control points for laboratory testing of petroleum product concentrations.
Substantial residual contamination exceeding regulatory standards was detected across the majority of soil, sediment, drainage ditch, and groundwater samples.
Implemented drainage and bioremediation measures produced only localized mitigation, failing to achieve comprehensive interception and removal of petroleum hydrocarbons.
Remediation deficiencies resulted from designing containment without adequate accounting for rock filtration properties, stratigraphic depth, and groundwater flow regimes.