Contaminated Land and Hydrogeology

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Contaminated Land and Hydrogeology

Experience in characterisation and remediation of contaminated sites with hydrocarbons and heavy metals.

In Costa Rica, we have represented our clients with the local authorities in order to reach solutions that protect the environment and, whenever possible, do not affect our client’s operations.

Contaminated Soil

Hydrogeology

We carry out hydrogeological studies that model groundwater at a local or regional level. Such studies help understand the formation, extension and behavior of aquifers, which is most important and must be included in decision making and land planning processes in order to achieve comprehensive water resource management.

  • Analysis of hydrogeological vulnerability and groundwater contamination risk.
  • Transit time appraisal.
  • Hydraulic balance calculation.
  • Spring characterization.
  • Calculation of catchment zones and protection areas for wells and springs.
  • Aquifer recharge analysis.
  • Saline intrusion risk assessments in coastal areas.

 

OBJECTIVES

  • Understand how aquifers form and behave.
  • Develop strategies for proper use.
  • Develop strategies for managing water resources.
  • Incorporate these strategies to economic, industrial and land development processes.

TECHNIQUES

  • Compilation of geological and hydrogeological data in the area of interest.
  • Geological mapping and on-site data collection.
  • Installation of monitoring Wells and geophysics.
  • Construction of conceptual hydrogeologic and numeric models.
  • Geographic information systems.

BENEFITS

Contaminated Land Diagnosis, Characterization and Remediation

We characterize oil spills, PCBs and heavy metals. We study the hydrogeological environment in order to assess the contamination risk and the impact on sensitive receptors. Subsequently we design remediation and monitoring strategies accordingly.

  • Phase II investigation.
  • Soil and water sampling and characterization.
  • Hydrogeological studies.
  • Passive sampling of ground gases.
  • Monitoring of contaminated soil and groundwater.
  • Remediation of contaminated land and groundwater.

 

OBJECTIVES

  • Characterize concentration levels of substances in soil, as well as the extension of possible areas of interest (i.e. potentially contaminated).
  • Establish land contamination management strategies based on risk assessments.
  • Establish remediation strategies to protect human health and the environment.

TECHNIQUES

  • Phase II assessments (ASTM E1903, CONCAWE 2003).
  • Internationally recognized contaminated land assessment
  • In-situ bioremediation of contaminated land.
  • Monitored natural attenuation (MNA) of pollutants in soil and groundwater.
  • Soil and water sampling and analysis through certified laboratories.
  • Conceptual modelling and characterization of hydrogeological vulnerability.
  • Staged procedures for the characterization of contaminated land (RBCA ASTM E2081, ASTM E1739).
  • Modelling of risks to human health and groundwater (i.e. HESP, CLEA, AERIS).

BENEFITS

  • Investigation, remediation and representation before authorities managed by Futuris.
  • Contamination risk assessments in order to determine the need for contaminated land remediation.
  • Staged procedure brings resource allocation and costs to a minimum.
  • Oftentimes the process is carried out without stopping operations at the contaminated site.
  • A specialized and experienced work team.

Key Projects Related to Contaminated Land and Hydrogeology

Phase II Evaluation

Category: Industrial Manufacturing

Phase II evaluation on a metallurgic plant due to historic sources of metal and hydrocarbons detected during Phase I. The investigation included Passive Soil Gas Screening and drilling of monitoring wells and soil borings to take soil and groundwater samples. The risk assessment showed that no remediation was required. A monitoring Plan was presented and approved by the Ministry of Health.

Soil Sampling Program for PCBs

Category: Government & Public Services

Soil sampling program for PCBs at eight electrical substations, within the framework of the implementation of the project “Integrated Management of PCB in Costa Rica” of the United Nations Development Program (UNDP). Sample location was defined based on previous studies and collection of samples was based on internationally recognized methodologies.

Phase II Evaluation

Category: Oil & Gas, Chemical

Phase II evaluation due to historical hydrocarbon sources in a petrol station in which soil drilling and monitoring wells were made to determine hotspots and the area of impact. Low risk to sensitive receptors. However, given refurbishment of the station, the Remediation Plan included an in-situ bio-remediation with a reduction of the concentrations in soil from 500 mg/kg to non-detectable in three months.

Bioremediation

Category: Oil & Gas, Chemical

Bioremediation of sand and water with hydrocarbons within a secondary containment of the fuel underground storage tanks (USTs) of a petrol station. Concentrations in water were successfully reduced from over 50000 μg/l to less than 100 μg/l, as required by the authorities.

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