Delineation of Contaminated Areas
Based on the outcomes of Phases II and III ESAs, the horizontal and vertical distributions of contaminants in the soil and groundwater systems are determined. These are more accurately done using our various groundwater flow and contaminant modelling software. Using the Conceptual Site Model, we are able to generate “slices” to obtain cross-sectional views of the subsurface and therefore the variation in contaminant plume concentration with depth. The information required for the development of an effective site remediation plan.
Site Risk Assessment
The main objective of a Site Risk Assessment (SRA) is to fully evaluate the potential risks to humans and ecological health due to the presence of contaminants at the site and to determine the appropriate management measures to put in place to mitigate those risks that are unacceptable. These management measurements may include contaminant recovery and plume containment. MEK will review all available environmental investigation reports together with technical guidance literature of the site and prepare a detailed SRA report for your site.
Remediation Action Plans and Implementation
MEK staff have prepared several Remedial Action Plans (RAPs) over the years. These plans are developed based on the findings of the ESA Phase II and Phase III assessments conducted at the sites. Our final RAP reports usually consists of four parts: background, the scope of remediation, post-remediation and a concordance table which lists contaminants of concerns, potential impact and any regulatory requirements.
The background section of the RAP provides a concise summary of the data, conclusions and recommendations obtained from the ESA assessments completed at the site and will include surface, subsurface and contaminant characterization information.
The scope of our Remedial Action Plans (RAPs) will usually address the following concerns:
- Identification of the major contaminants of concerns and the basis for their selections;
- The main objectives of the remediation and a justification for the intended objectives;
- A detailed description of method and techniques by which the remediation will be implemented;
- Type and quantity of sampling and analyses to be done and the quality control and assurance measures that must be put in place;
- Emergency plans to mitigate potential adverse effects to adjacent receptors such as humans, water wells, surface water, livestock, vegetation and wildlife; and lastly;
- A schedule for the carrying out the RAP.
Typically, the post-remediation component will address:
- Long-term monitoring programming required including details and timing of sampling and analyses needed;
- Erosion control measures that may be required during after remediation of the site;
- Slope stability challenges resulting from site disturbance;
- A contingency plan to address newly contaminants that may be identified during the course of remediation ; and
- The extent of reclamation and restoration required to return the site to a productive or natural state.