If soil or ground water contamination is identified through a Phase II ESA or an excavation of an underground storage tank, it is usually addressed through site cleanup or remediation.
A Simple Approach Excavation and offsite disposal is effective for both soil and ground water contamination by removing the soil source of contamination. Once removed, the ground water contamination will naturally decrease. It’s the technology we recommend if it meets our client’s objectives and budget.
We determine the cost and feasibility of excavating and offsite disposal. If time and space permit, we can recommend and design onsite treatment for excavated soils. The principals of our remediation consulting team have more than 15 years experience working on in situ remediation projects throughout North America.
Environmental Consulting and Soil Testing
We provide support services relating to the site cleanup, which can include engineering inspections and oversight, verification sampling to confirm the cleanup, documentation of the proceedings, and preparation of a site cleanup report. For larger projects, we manage remediation, which includes project coordination, liaison with the client, contractor, and regulatory authorities, project meetings, review of work progress budget and schedule, and payment certification. A qualified contractor is retained by the property owner to conduct the cleanup or remediation.
Remedial Option Analysis
We use existing site data to develop a conceptual site model (CSM) and a remedial action plan (RAP). The RAP typically lists at least two approaches for remediation and provides an initial scope of work, cost estimate, schedule, and description of the technologies to be applied.
- Complex situations
We do not use pump-and-treat technologies for the remediation of contaminated properties as they are only effective for the recovery of liquid phase hydrocarbon (LPH) and other non-aqueous compounds as well as the containment of contamination to property boundaries. If excavation technologies are not feasible because of the depth of contamination, presence of buildings, or other complicating factors then we evaluate potential in situ treatments. In situ remediation is costly and time-consuming, but it can be effective and discrete enough to allow ongoing use of the property during remediation.
- Hydrocarbon Contamination
Hydrocarbon contamination is the most common type of contamination. We delineate the extent of contamination, provide direction and advice on the protection of the local water wells, and advise on the design, operation, and optimization of an in situ remediation system, if required. Because they are volatile, biodegradable, or a combination of both we typically recommend vapour extraction, air sparging, or some form of aeration for these types of contaminants. Pilot scale testing of these technologies is required to determine well design, well spacing, air flow rates, and treatment requirements for extracted air. See Remediation Oil Spill Case Study for more info.
- Non-Hydrocarbon Contamination
Metal contaminated soil and ground water are often the result of industrial or automobile-related land use. Our most common approach for metal remediation is excavation and disposal, though we also have experience with stabilization and other technologies. Chlorinated solvents are often related to dry cleaners or automobile-related land use and this type of contamination can be difficult to assess and remediate. Chlorinated contamination can be difficult to assess and remediate. We determine the source and focus remedial efforts there. Excavation techniques are the most common approach that we recommend, but aeration technologies such as air sparging and vapour extraction, as well as chemical oxidation are options that we have used.
Underground Storage Tank Removal Consulting
We will advise about the best way to remove underground fuel storage tanks to minimize potential contamination.
In Situ Remediation
We evaluate, design, implement, and optimize innovative soil and ground water in situ remediation programs.