Last Updated November 22, 2016.
The dig and dump concept of remediation is not true remediation as the problem is not resolved, rather relocated. However, this concept is considered the quickest route to provide your client with the fastest method to provide environmental documentation that provides evidence of on-site soil to meet the regulatory requirements. The quickest route often comes at a price. Typically, this route has the highest initial cost. The dig and dump method does not address groundwater issues, but does assist in reducing the concentration by removing the source (assuming the source was above the water table).
A good rule of thumb for this cost would be approximately $100.00 CDN per standard tri-axial truckload which can hold approximately 10 cubic meters (approximately 22 tonnes) of material. This cost would cover the on-site excavator, operator and importation of fill that would meet regulatory requirements. The cost would have a variation based on location (compared to receiving site and fill source site) as well as other variables.
The preliminary cost of remediation can be estimated if delineation of the property has been carried out to show the full lateral and vertical extent of the exceedances. This is often difficult to do as full delineation can be costly. Therefore a cost/benefit analysis would need to be carried out by the consultant to ensure the client's funds are being used to their greatest benefit.
The dig and dump method will require site supervision by the consultant as well as confirmation sampling of the soil to verify that the removal has been completed to the regulatory requirements. The number of floor and wall samples required is based on the floor area of the excavation in Ontario.
The above information was taken from the Ontario Regulation 153/04 (as amended) document that provides a standard for Record of Site Condition (RSC) properties. We tend to use this document as a guideline when working with properties that are not classified as an RSC site.
It is best to have different walls sampled to get a better representation of the environmental conditions of the excavated area.
The dig and dump method will require site supervision by the consultant as well as confirmation sampling of the soil to verify that the removal has been completed to the regulatory requirements. The number of floor and wall samples required is based on the floor area of the excavation in Ontario.
The above information was taken from the Ontario Regulation 153/04 (as amended) document that provides a standard for Record of Site Condition (RSC) properties. We tend to use this document as a guideline when working with properties that are not classified as an RSC site.
It is best to have different walls sampled to get a better representation of the environmental conditions of the excavated area.
Screening and sampling methods will be discussed in a different article. The parameters for chemical analysis will be determined by the professional managing the environmental consulting portion of the site.
No comments:
Post a Comment