Risk Assessment Services

Schlumberger Water Services (SWS) conducts risk assessments for hazards that may be caused by potential release of a contaminant. These assessments are key to creating a strategy and to making future risk management decisions. Project components include the following.

  • Groundwater modeling: Using the hydrogeologic setting information and contamination data gathered under site characterization, SWS can employ a number of hydrogeologic models to assess the risks and pathways to human and ecological receptors or to identify impacts on natural resources.
  • Model selection: SWS will select an appropriate model based on the configuration of the groundwater regime in relationship to the plume or source term. Simple sites can be modeled using common saturated flow models. Hydrogeologic flow in vadose-zone conditions will require a different type of model from flow in noncontinuous media such as braided fluvial deposits and fractured bedrock.
  • Hydrology and groundwater interface determination: Our technical experts will perform modeling to evaluate where the subsurface hydrology interfaces with groundwater usage. This determination will be made based on the surface hydrology and well information.

Project Examples:

Environmental risk assessment of carcass and C&D disposal sites 
- England and Wales 
Client - Department for Environment, Food and Rural Affairs
Description - Following an outbreak of foot and mouth disease in 2001, SWS undertook retrospective risk assessments of all carcass and ash burial sites in England and Wales, and all cleansing and disinfection (C&D) disposal sites in Wales. A tiered risk assessment methodology was developed and applied to the sites that examined the ongoing risk of contamination of groundwater and surface water. The results were presented in a comprehensive database and included recommendations for monitoring and remedial action. 

Transboundary flood management
- Canada/USA
Client - International Joint Commission
Description - The frequent flooding of the lower Pembina River into Manitoba, Canada, and North Dakota, USA, is the cause of an international dispute between the two governments. The International Joint Commission retained SWS to carry out a detailed hydrodynamic flood modeling study of the river to determine the causes of the flooding.

Cryptosporidium Risk Assessment
Location - Southern England
Client - Southern Water Services
Description - SWS developed a multicriteria decision analysis methodology for assessing the risk to public water supply groundwater sources of contamination by cryptosporidium (a protozoan parasite, the oocysts of which are resistant to most disinfection regimes). The methodology was applied to all Southern Water's groundwater sources to prioritize action and to form part of the official submission to the Drinking Water Inspectorate. The methodology has been published (QJEGH, Vol. 34, pp 187-194, May 2001). 

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