Maud Depot Case Study
Project Title:
Maud Depot Remediation
Site:
The site was used as a depot for a company working with agricultural chemicals for over 20 years until it closed in 2005. Chemicals stored at the site included pesticides and fertilisers. In addition there was a chemical soakaway on the site used for the disposal of dilute residues, e.g. washings. Use of the soakaway ceased in 1989, and it was filled in and covered with hardcore. The area of the site is approximately 2800 m2, and is located within a residential area with private housing on three of the four site boundaries.
Contamination
The site investigation revealed areas of both hydrocarbon and pesticide contamination. The main pesticides of concern were DDT, trifluralin and aldrin. In some parts of the site the contamination was detected to depths of >1m.
Remediation
Remediation of the contaminated soil was carried out ex situ by chemical oxidation, using iron sulphate and hydrogen peroxide, causing the contaminants to be rapidly degraded.
The soil was graded prior to treatment to remove any large stones and then the graded material was fed into our remediation plant where the chemicals were applied and thoroughly mixed with the soil.
Benefits
An 85-95 % reduction in contaminant concentration was achieved, and the site was sold for industrial/commercial use.